From 6ffbd82a64d472d700d97d6266ba6dc2b6bbc162 Mon Sep 17 00:00:00 2001 From: "Ned T. Crigler" Date: Fri, 28 Sep 2001 00:50:56 +0000 Subject: [PATCH] initial import to sourceforge --- COPYING | 340 ++++++++++ Makefile.in | 35 ++ README | 30 + attach.c | 250 ++++++++ config.h.in | 43 ++ configure | 1715 ++++++++++++++++++++++++++++++++++++++++++++++++++ configure.in | 23 + detach.h | 91 +++ dtach.1 | 153 +++++ dtach.spec | 83 +++ main.c | 216 +++++++ master.c | 327 ++++++++++ 12 files changed, 3306 insertions(+) create mode 100644 COPYING create mode 100644 Makefile.in create mode 100644 README create mode 100644 attach.c create mode 100644 config.h.in create mode 100755 configure create mode 100644 configure.in create mode 100644 detach.h create mode 100644 dtach.1 create mode 100644 dtach.spec create mode 100644 main.c create mode 100644 master.c diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..d60c31a --- /dev/null +++ b/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. This +General Public License applies to most of the Free Software +Foundation's software and to any other program whose authors commit to +using it. (Some other Free Software Foundation software is covered by +the GNU Library General Public License instead.) You can apply it to +your programs, too. + + When we speak of free software, we are referring to freedom, not +price. Our General Public Licenses are designed to make sure that you +have the freedom to distribute copies of free software (and charge for +this service if you wish), that you receive source code or can get it +if you want it, that you can change the software or use pieces of it +in new free programs; and that you know you can do these things. + + To protect your rights, we need to make restrictions that forbid +anyone to deny you these rights or to ask you to surrender the rights. +These restrictions translate to certain responsibilities for you if you +distribute copies of the software, or if you modify it. + + For example, if you distribute copies of such a program, whether +gratis or for a fee, you must give the recipients all the rights that +you have. You must make sure that they, too, receive or can get the +source code. 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To prevent this, we have made it clear that any +patent must be licensed for everyone's free use or not licensed at all. + + The precise terms and conditions for copying, distribution and +modification follow. + + GNU GENERAL PUBLIC LICENSE + TERMS AND CONDITIONS FOR COPYING, DISTRIBUTION AND MODIFICATION + + 0. This License applies to any program or other work which contains +a notice placed by the copyright holder saying it may be distributed +under the terms of this General Public License. The "Program", below, +refers to any such program or work, and a "work based on the Program" +means either the Program or any derivative work under copyright law: +that is to say, a work containing the Program or a portion of it, +either verbatim or with modifications and/or translated into another +language. (Hereinafter, translation is included without limitation in +the term "modification".) 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You may copy and distribute verbatim copies of the Program's +source code as you receive it, in any medium, provided that you +conspicuously and appropriately publish on each copy an appropriate +copyright notice and disclaimer of warranty; keep intact all the +notices that refer to this License and to the absence of any warranty; +and give any other recipients of the Program a copy of this License +along with the Program. + +You may charge a fee for the physical act of transferring a copy, and +you may at your option offer warranty protection in exchange for a fee. + + 2. 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It is safest +to attach them to the start of each source file to most effectively +convey the exclusion of warranty; and each file should have at least +the "copyright" line and a pointer to where the full notice is found. + + + Copyright (C) + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/Makefile.in b/Makefile.in new file mode 100644 index 0000000..918eafa --- /dev/null +++ b/Makefile.in @@ -0,0 +1,35 @@ +srcdir = @srcdir@ +CC = @CC@ +CFLAGS = -W -Wall -I. @CFLAGS@ +LDFLAGS = @LDFLAGS@ +LIBS = @LIBS@ +VERSION = 0.3 +VPATH = $(srcdir) + +OBJ = attach.o master.o main.o +SRC = $(srcdir)/attach.c $(srcdir)/master.c $(srcdir)/main.c + +TARFILES = $(srcdir)/README $(srcdir)/COPYING $(srcdir)/*.in $(srcdir)/*.c \ + $(srcdir)/*.h $(srcdir)/dtach.spec $(srcdir)/configure \ + $(srcdir)/dtach.1 + +dtach: $(OBJ) + $(CC) -o $@ $(LDFLAGS) $^ $(LIBS) + +clean: + rm -f .depend dtach $(OBJ) dtach-$(VERSION).tar.gz + +distclean: clean + rm -f config.h Makefile config.log config.status config.cache + +tar: + mkdir dtach-$(VERSION) + cp $(TARFILES) dtach-$(VERSION) + tar -cf dtach-$(VERSION).tar dtach-$(VERSION)/ + gzip -9f dtach-$(VERSION).tar + rm -rf dtach-$(VERSION) + +.depend: + @$(CC) $(CFLAGS) -MM $(SRC) > $@ + +-include .depend diff --git a/README b/README new file mode 100644 index 0000000..c881c0d --- /dev/null +++ b/README @@ -0,0 +1,30 @@ +dtach is a program written in C that emulates the detach feature of +screen, which allows a program to be executed in an environment that is +protected from the controlling terminal. For instance, the program under +the control of dtach would not be affected by the terminal being +disconnected for some reason. + +dtach was written because screen did not adequately meet my needs; I did +not need the other features of screen, such as its support of multiple +terminals or its terminal emulation support. screen was also too big, +bulky, and the source code was also difficult to understand. + +screen also interfered with my use of full-screen applications such as +emacs and ircII, since screen excessively interprets the stream between +the program and the attached terminals. dtach does not have a terminal +emulation layer, and passes the raw output stream of the program to the +attached terminals. The input processing that dtach performs is +scanning for the detach character (which signals dtach to detach from +the program) and processing the suspend key (which tells dtach to +temporarily suspend itself without affecting the running program), which +can both be disabled if desired. + +Contrary to screen, dtach has minimal features, and is extremely tiny. +The small size allows it to be more easily audited for bugs and security +holes, and also allows it to fit in environments where space is limited, +such as on rescue disks. + +dtach has only been tested on the Linux/x86 platform, however it should +be easily portable to other variants of Unix. It currently assumes that +the host system uses POSIX termios, and has a working forkpty function +available. diff --git a/attach.c b/attach.c new file mode 100644 index 0000000..c5fb412 --- /dev/null +++ b/attach.c @@ -0,0 +1,250 @@ +/* + dtach - A simple program that emulates the detach feature of screen. + Copyright (C) 2001 Ned T. Crigler + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ +#include "detach.h" + +#ifndef VDISABLE +#ifdef _POSIX_VDISABLE +#define VDISABLE _POSIX_VDISABLE +#else +#define VDISABLE 0377 +#endif +#endif + +// The current terminal settings. After coming back from a suspend, we +// restore this. +static struct termios cur_term; +// 1 if the window size changed +static int win_changed; +// 1 if we want a redraw +static int want_redraw; + +// This hopefully moves to the bottom of the screen +#define EOS "\033[999H" + +// Restores the original terminal settings. +static void +restore_term(void) +{ + tcsetattr(0, TCSADRAIN, &orig_term); + // Make cursor visible. Assumes VT100. + printf("\033[?25h\033[?0c"); + fflush(stdout); +} + +// Connects to a unix domain socket +static int +connect_socket(char *name) +{ + int s; + struct sockaddr_un sun; + + s = socket(PF_UNIX, SOCK_STREAM, 0); + if (s < 0) + return -1; + sun.sun_family = AF_UNIX; + strcpy(sun.sun_path, name); + if (connect(s, (struct sockaddr*)&sun, sizeof(sun)) < 0) + return -1; + return s; +} + +// Signal +static RETSIGTYPE +die(int sig) +{ + // Print a nice pretty message for some things. + if (sig == SIGHUP || sig == SIGINT) + printf(EOS "\r\n[detached]\r\n"); + else + printf(EOS "\r\n[got signal %d - dying]\r\n", sig); + exit(1); +} + +// Window size change. +static RETSIGTYPE +win_change() +{ + win_changed = 1; +} + +// Handles input from the keyboard. +static void +process_kbd(int s, struct packet *pkt) +{ + // Suspend? + if (!no_suspend && (pkt->u.buf[0] == cur_term.c_cc[VSUSP])) + { + // Tell the master that we are suspending. + pkt->type = MSG_DETACH; + write(s, pkt, sizeof(*pkt)); + + // And suspend... + tcsetattr(0, TCSADRAIN, &orig_term); + kill(getpid(), SIGTSTP); + tcsetattr(0, TCSADRAIN, &cur_term); + + // Tell the master that we are returning. + pkt->type = MSG_ATTACH; + write(s, pkt, sizeof(*pkt)); + + // The window size might have changed, and we definately want + // a redraw. We don't want to pass the suspend, though. + win_changed = 1; + want_redraw = 1; + return; + } + // Detach char? + else if (pkt->u.buf[0] == detach_char) + { + printf(EOS "\r\n[detached]\r\n"); + exit(1); + } + // Just in case something pukes out. + else if (pkt->u.buf[0] == '\f') + win_changed = 1; + + // Push it out + write(s, pkt, sizeof(*pkt)); +} + +int +attach_main(int noerror) +{ + int s; + struct pollfd polls[2]; + struct packet pkt; + unsigned char buf[BUFSIZE]; + + // The current terminal settings are equal to the original terminal + // settings at this point. + cur_term = orig_term; + + // Set a trap to restore the terminal when we die. + atexit(restore_term); + + // Set some signals. + signal(SIGPIPE, SIG_IGN); + signal(SIGXFSZ, SIG_IGN); + signal(SIGHUP, die); + signal(SIGTERM, die); + signal(SIGINT, die); + signal(SIGQUIT, die); + signal(SIGWINCH, win_change); + + // Attempt to open the socket. Don't display an error if noerror is + // set. + s = connect_socket(sockname); + if (s < 0) + { + if (!noerror) + printf("%s: %s: %s\n", progname, sockname, + strerror(errno)); + return 1; + } + + // Set raw mode, almost. We allow flow control to work, for instance. + cur_term.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP|INLCR|IGNCR|ICRNL); + cur_term.c_oflag &= ~(OPOST); + cur_term.c_lflag &= ~(ECHO|ECHONL|ICANON|ISIG|IEXTEN); + cur_term.c_cflag &= ~(CSIZE|PARENB); + cur_term.c_cflag |= CS8; + cur_term.c_cc[VLNEXT] = VDISABLE; + + tcsetattr(0, TCSADRAIN, &cur_term); + + // Clear the screen. This assumes VT100. + write(1, "\33[H\33[J", 6); + + // Set up the poll structures + polls[0].fd = 0; + polls[0].events = POLLIN; + polls[0].revents = 0; + polls[1].fd = s; + polls[1].events = POLLIN; + polls[1].revents = 0; + + // Send our window size. + pkt.type = MSG_WINCH; + ioctl(0, TIOCGWINSZ, &pkt.u.ws); + write(s, &pkt, sizeof(pkt)); + // We would like a redraw, too. + pkt.type = MSG_REDRAW; + write(s, &pkt, sizeof(pkt)); + + // Wait for things to happen + while (1) + { + if (poll(polls, 2, -1) < 0) + { + if (errno != EINTR && errno != EAGAIN) + { + printf(EOS "\r\n[poll failed]\r\n"); + exit(1); + } + } + // Pty activity + if (polls[1].revents != 0) + { + int len = read(s, buf, sizeof(buf)); + + if (len == 0) + { + printf(EOS "\r\n[EOF - dtach terminating]" + "\r\n"); + exit(1); + } + else if (len < 0) + { + printf(EOS "\r\n[read returned an error]\r\n"); + exit(1); + } + // Send the data to the terminal. + write(1, buf, len); + } + // stdin activity + if (polls[0].revents != 0) + { + pkt.type = MSG_PUSH; + memset(pkt.u.buf, 0, sizeof(pkt.u.buf)); + pkt.len = read(0, pkt.u.buf, sizeof(pkt.u.buf)); + + if (pkt.len <= 0) + exit(1); + process_kbd(s, &pkt); + } + // Window size changed? + if (win_changed) + { + win_changed = 0; + + pkt.type = MSG_WINCH; + ioctl(0, TIOCGWINSZ, &pkt.u.ws); + write(s, &pkt, sizeof(pkt)); + } + // Want a redraw? + if (want_redraw) + { + want_redraw = 0; + + pkt.type = MSG_REDRAW; + write(s, &pkt, sizeof(pkt)); + } + } + return 0; +} diff --git a/config.h.in b/config.h.in new file mode 100644 index 0000000..71e0f2d --- /dev/null +++ b/config.h.in @@ -0,0 +1,43 @@ +/* config.h.in. Generated automatically from configure.in by autoheader. */ + +/* Define if you have the `forkpty' function. */ +#undef HAVE_FORKPTY + +/* Define if you have the `getrlimit' function. */ +#undef HAVE_GETRLIMIT + +/* Define if you have the `util' library (-lutil). */ +#undef HAVE_LIBUTIL + +/* Define if you have the header file. */ +#undef HAVE_PTY_H + +/* Define if you have the `socket' function. */ +#undef HAVE_SOCKET + +/* Define if you have the `strerror' function. */ +#undef HAVE_STRERROR + +/* Define if you have the header file. */ +#undef HAVE_SYS_IOCTL_H + +/* Define if you have the header file. */ +#undef HAVE_SYS_RESOURCE_H + +/* Define if you have the header file. */ +#undef HAVE_TERMIOS_H + +/* Define if you have the header file. */ +#undef HAVE_UNISTD_H + +/* Define if you have the header file. */ +#undef HAVE_UTIL_H + +/* Define as the return type of signal handlers (`int' or `void'). */ +#undef RETSIGTYPE + +/* Define if you have the ANSI C header files. */ +#undef STDC_HEADERS + +/* Define to `int' if does not define. */ +#undef pid_t diff --git a/configure b/configure new file mode 100755 index 0000000..056f407 --- /dev/null +++ b/configure @@ -0,0 +1,1715 @@ +#! /bin/sh +# Guess values for system-dependent variables and create Makefiles. +# Generated automatically using Autoconf version 2.14.1 +# Copyright (C) 1992, 93, 94, 95, 96, 98, 1999 Free Software Foundation, Inc. +# +# This configure script is free software; the Free Software Foundation +# gives unlimited permission to copy, distribute and modify it. + +# Defaults: +ac_arg_with_help= +ac_arg_enable_help= +ac_arg_var_help= +ac_default_prefix=/usr/local +# Any additions from configure.in: +ac_arg_var_help="$ac_arg_var_help + CFLAGS Extra flags for the C compiler" + +# Initialize some variables set by options. +# The variables have the same names as the options, with +# dashes changed to underlines. +build=NONE +cache_file=./config.cache +exec_prefix=NONE +host=NONE +no_create= +nonopt=NONE +no_recursion= +prefix=NONE +program_prefix=NONE +program_suffix=NONE +program_transform_name=s,x,x, +silent= +site= +srcdir= +target=NONE +verbose= +x_includes=NONE +x_libraries=NONE +bindir='${exec_prefix}/bin' +sbindir='${exec_prefix}/sbin' +libexecdir='${exec_prefix}/libexec' +datadir='${prefix}/share' +sysconfdir='${prefix}/etc' +sharedstatedir='${prefix}/com' +localstatedir='${prefix}/var' +libdir='${exec_prefix}/lib' +includedir='${prefix}/include' +oldincludedir='/usr/include' +infodir='${prefix}/info' +mandir='${prefix}/man' + +# Initialize some other variables. +subdirs= +MFLAGS= MAKEFLAGS= +SHELL=${CONFIG_SHELL-/bin/sh} +# Maximum number of lines to put in a shell here document. +: ${ac_max_here_lines=12} +# Sed expression to map a string onto a valid sh and CPP variable names. +ac_tr_sh='sed -e y%*+%pp%;s%[^a-zA-Z0-9_]%_%g' +ac_tr_cpp='sed -e y%*abcdefghijklmnopqrstuvwxyz%PABCDEFGHIJKLMNOPQRSTUVWXYZ%;s%[^A-Z0-9_]%_%g' + +ac_prev= +for ac_option +do + + # If the previous option needs an argument, assign it. + if test -n "$ac_prev"; then + eval "$ac_prev=\$ac_option" + ac_prev= + continue + fi + + case "$ac_option" in + -*=*) ac_optarg=`echo "$ac_option" | sed 's/[-_a-zA-Z0-9]*=//'` ;; + *) ac_optarg= ;; + esac + + # Accept the important Cygnus configure options, so we can diagnose typos. + + case "$ac_option" in + + -bindir | --bindir | --bindi | --bind | --bin | --bi) + ac_prev=bindir ;; + -bindir=* | --bindir=* | --bindi=* | --bind=* | --bin=* | --bi=*) + bindir="$ac_optarg" ;; + + -build | --build | --buil | --bui | --bu) + ac_prev=build ;; + -build=* | --build=* | --buil=* | --bui=* | --bu=*) + build="$ac_optarg" ;; + + -cache-file | --cache-file | --cache-fil | --cache-fi \ + | --cache-f | --cache- | --cache | --cach | --cac | --ca | --c) + ac_prev=cache_file ;; + -cache-file=* | --cache-file=* | --cache-fil=* | --cache-fi=* \ + | --cache-f=* | --cache-=* | --cache=* | --cach=* | --cac=* | --ca=* | --c=*) + cache_file="$ac_optarg" ;; + + -datadir | --datadir | --datadi | --datad | --data | --dat | --da) + ac_prev=datadir ;; + -datadir=* | --datadir=* | --datadi=* | --datad=* | --data=* | --dat=* \ + | --da=*) + datadir="$ac_optarg" ;; + + -disable-* | --disable-*) + ac_feature=`echo "$ac_option"|sed -e 's/-*disable-//'` + # Reject names that are not valid shell variable names. + if echo "$ac_feature" | grep '[^-a-zA-Z0-9_]' >/dev/null 2>&1; then + { echo "configure: error: $ac_feature: invalid feature name" 1>&2; exit 1; } + fi + ac_feature=`echo $ac_feature| sed 's/-/_/g'` + eval "enable_${ac_feature}=no" ;; + + -enable-* | --enable-*) + ac_feature=`echo "$ac_option"|sed -e 's/-*enable-//' -e 's/=.*//'` + # Reject names that are not valid shell variable names. + if echo "$ac_feature" | grep '[^-a-zA-Z0-9_]' >/dev/null 2>&1; then + { echo "configure: error: $ac_feature: invalid feature name" 1>&2; exit 1; } + fi + ac_feature=`echo $ac_feature| sed 's/-/_/g'` + case "$ac_option" in + *=*) ac_optarg=`echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"`;; + *) ac_optarg=yes ;; + esac + eval "enable_${ac_feature}='$ac_optarg'" ;; + + -exec-prefix | --exec_prefix | --exec-prefix | --exec-prefi \ + | --exec-pref | --exec-pre | --exec-pr | --exec-p | --exec- \ + | --exec | --exe | --ex) + ac_prev=exec_prefix ;; + -exec-prefix=* | --exec_prefix=* | --exec-prefix=* | --exec-prefi=* \ + | --exec-pref=* | --exec-pre=* | --exec-pr=* | --exec-p=* | --exec-=* \ + | --exec=* | --exe=* | --ex=*) + exec_prefix="$ac_optarg" ;; + + -gas | --gas | --ga | --g) + # Obsolete; use --with-gas. + with_gas=yes ;; + + -help | --help | --hel | --he) + # Omit some internal or obsolete options to make the list less imposing. + # This message is too long to be a string in the A/UX 3.1 sh. + cat << \EOF +`configure' configures software source code packages to adapt to many kinds +of systems. + +Usage: configure [OPTION]... [VAR=VALUE]... [HOST] + +To safely assign special values to environment variables (e.g., CC, +CFLAGS...), give to `configure' the definition as VAR=VALUE. + +Defaults for the options are specified in brackets. + +Configuration: + --cache-file=FILE cache test results in FILE + --help print this message + --no-create do not create output files + --quiet, --silent do not print \`checking...' messages + --version print the version of autoconf that created configure + +Directory and file names: + --prefix=PREFIX install architecture-independent files in PREFIX + [$ac_default_prefix] + --exec-prefix=EPREFIX install architecture-dependent files in EPREFIX + [same as prefix] + --bindir=DIR user executables in DIR [EPREFIX/bin] + --sbindir=DIR system admin executables in DIR [EPREFIX/sbin] + --libexecdir=DIR program executables in DIR [EPREFIX/libexec] + --datadir=DIR read-only architecture-independent data in DIR + [PREFIX/share] + --sysconfdir=DIR read-only single-machine data in DIR [PREFIX/etc] + --sharedstatedir=DIR modifiable architecture-independent data in DIR + [PREFIX/com] + --localstatedir=DIR modifiable single-machine data in DIR [PREFIX/var] + --libdir=DIR object code libraries in DIR [EPREFIX/lib] + --includedir=DIR C header files in DIR [PREFIX/include] + --oldincludedir=DIR C header files for non-gcc in DIR [/usr/include] + --infodir=DIR info documentation in DIR [PREFIX/info] + --mandir=DIR man documentation in DIR [PREFIX/man] + --srcdir=DIR find the sources in DIR [configure dir or ..] + +Program names: + --program-prefix=PREFIX prepend PREFIX to installed program names + --program-suffix=SUFFIX append SUFFIX to installed program names + --program-transform-name=PROGRAM + run sed PROGRAM on installed program names + +EOF + cat << \EOF +Host type: + --build=BUILD configure for building on BUILD [BUILD=HOST] + --host=HOST configure for HOST [guessed] + --target=TARGET configure for TARGET [TARGET=HOST] + +Features and packages: + --disable-FEATURE do not include FEATURE (same as --enable-FEATURE=no) + --enable-FEATURE[=ARG] include FEATURE [ARG=yes] + --with-PACKAGE[=ARG] use PACKAGE [ARG=yes] + --without-PACKAGE do not use PACKAGE (same as --with-PACKAGE=no) + --x-includes=DIR X include files are in DIR + --x-libraries=DIR X library files are in DIR +EOF + test -n "$ac_arg_enable_help" && echo " +--enable options recognized:$ac_arg_enable_help" + test -n "$ac_arg_with_help" && echo " +--with options recognized:$ac_arg_with_help" + test -n "$ac_arg_var_help" && echo " +Some of the influent environment variables:$ac_arg_var_help" + exit 0 ;; + + -host | --host | --hos | --ho) + ac_prev=host ;; + -host=* | --host=* | --hos=* | --ho=*) + host="$ac_optarg" ;; + + -includedir | --includedir | --includedi | --included | --include \ + | --includ | --inclu | --incl | --inc) + ac_prev=includedir ;; + -includedir=* | --includedir=* | --includedi=* | --included=* | --include=* \ + | --includ=* | --inclu=* | --incl=* | --inc=*) + includedir="$ac_optarg" ;; + + -infodir | --infodir | --infodi | --infod | --info | --inf) + ac_prev=infodir ;; + -infodir=* | --infodir=* | --infodi=* | --infod=* | --info=* | --inf=*) + infodir="$ac_optarg" ;; + + -libdir | --libdir | --libdi | --libd) + ac_prev=libdir ;; + -libdir=* | --libdir=* | --libdi=* | --libd=*) + libdir="$ac_optarg" ;; + + -libexecdir | --libexecdir | --libexecdi | --libexecd | --libexec \ + | --libexe | --libex | --libe) + ac_prev=libexecdir ;; + -libexecdir=* | --libexecdir=* | --libexecdi=* | --libexecd=* | --libexec=* \ + | --libexe=* | --libex=* | --libe=*) + libexecdir="$ac_optarg" ;; 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+ + -target | --target | --targe | --targ | --tar | --ta | --t) + ac_prev=target ;; + -target=* | --target=* | --targe=* | --targ=* | --tar=* | --ta=* | --t=*) + target="$ac_optarg" ;; + + -v | -verbose | --verbose | --verbos | --verbo | --verb) + verbose=yes ;; + + -version | --version | --versio | --versi | --vers) + echo "configure generated by autoconf version 2.14.1" + exit 0 ;; + + -with-* | --with-*) + ac_package=`echo "$ac_option"|sed -e 's/-*with-//' -e 's/=.*//'` + # Reject names that are not valid shell variable names. + if echo "$ac_feature" | grep '[^-a-zA-Z0-9_]' >/dev/null 2>&1; then + { echo "configure: error: $ac_package: invalid package name" 1>&2; exit 1; } + fi + ac_package=`echo $ac_package| sed 's/-/_/g'` + case "$ac_option" in + *=*) ac_optarg=`echo "$ac_optarg" | sed "s/'/'\\\\\\\\''/g"`;; + *) ac_optarg=yes ;; + esac + eval "with_${ac_package}='$ac_optarg'" ;; + + -without-* | --without-*) + ac_package=`echo "$ac_option"|sed -e 's/-*without-//'` + # Reject names that are not valid shell variable names. + if echo "$ac_feature" | grep '[^-a-zA-Z0-9_]' >/dev/null 2>&1; then + { echo "configure: error: $ac_package: invalid package name" 1>&2; exit 1; } + fi + ac_package=`echo $ac_package| sed 's/-/_/g'` + eval "with_${ac_package}=no" ;; + + --x) + # Obsolete; use --with-x. + with_x=yes ;; + + -x-includes | --x-includes | --x-include | --x-includ | --x-inclu \ + | --x-incl | --x-inc | --x-in | --x-i) + ac_prev=x_includes ;; + -x-includes=* | --x-includes=* | --x-include=* | --x-includ=* | --x-inclu=* \ + | --x-incl=* | --x-inc=* | --x-in=* | --x-i=*) + x_includes="$ac_optarg" ;; + + -x-libraries | --x-libraries | --x-librarie | --x-librari \ + | --x-librar | --x-libra | --x-libr | --x-lib | --x-li | --x-l) + ac_prev=x_libraries ;; + -x-libraries=* | --x-libraries=* | --x-librarie=* | --x-librari=* \ + | --x-librar=* | --x-libra=* | --x-libr=* | --x-lib=* | --x-li=* | --x-l=*) + x_libraries="$ac_optarg" ;; + + -*) { echo "configure: error: $ac_option: invalid option; use --help to show usage" 1>&2; exit 1; } + ;; + + *=*) + ac_envvar=`echo $ac_option|sed -e 's/=.*//'` + # Reject names that are not valid shell variable names. + if test -n "`echo $ac_envvar| sed 's/[_a-zA-Z0-9]//g'`"; then + { echo "configure: error: $ac_envvar: invalid variable name" 1>&2; exit 1; } + fi + eval "${ac_envvar}='$ac_optarg'" + export $ac_envvar ;; + + *) + if echo "$ac_feature" | grep '[^-a-zA-Z0-9.]' >/dev/null 2>&1; then + echo "configure: warning: $ac_option: invalid host type" 1>&2 + fi + if test "x$nonopt" != xNONE; then + { echo "configure: error: can only configure for one host and one target at a time" 1>&2; exit 1; } + fi + nonopt="$ac_option" + ;; + + esac +done + +if test -n "$ac_prev"; then + { echo "configure: error: missing argument to --\`echo $ac_prev | sed 's/_/-/g'\`" 1>&2; exit 1; } +fi + +trap 'rm -fr conftest* confdefs* core core.* *.core $ac_clean_files; exit 1' 1 2 15 + +# File descriptor usage: +# 0 standard input +# 1 file creation +# 2 errors and warnings +# 3 some systems may open it to /dev/tty +# 4 used on the Kubota Titan +# 6 checking for... messages and results +# 5 compiler messages saved in config.log +if test "$silent" = yes; then + exec 6>/dev/null +else + exec 6>&1 +fi +exec 5>./config.log + +echo "\ +This file contains any messages produced by compilers while +running configure, to aid debugging if configure makes a mistake. +" 1>&5 + +# Strip out --no-create and --no-recursion so they do not pile up. +# Also quote any args containing shell meta-characters. +ac_configure_args= +for ac_arg +do + case "$ac_arg" in + -no-create | --no-create | --no-creat | --no-crea | --no-cre \ + | --no-cr | --no-c) ;; + -no-recursion | --no-recursion | --no-recursio | --no-recursi \ + | --no-recurs | --no-recur | --no-recu | --no-rec | --no-re | --no-r) ;; + *" "*|*" "*|*[\[\]\~\#\$\^\&\*\(\)\{\}\\\|\;\<\>\?]*) + ac_arg=`echo "$ac_arg"|sed "s/'/'\\\\\\\\''/g"` + ac_configure_args="$ac_configure_args '$ac_arg'" ;; + *) ac_configure_args="$ac_configure_args $ac_arg" ;; + esac +done + +# NLS nuisances. +# Only set these to C if already set. These must not be set unconditionally +# because not all systems understand e.g. LANG=C (notably SCO). +# Fixing LC_MESSAGES prevents Solaris sh from translating var values in `set'! +# Non-C LC_CTYPE values break the ctype check. +if test "${LANG+set}" = set; then LANG=C; export LANG; fi +if test "${LC_ALL+set}" = set; then LC_ALL=C; export LC_ALL; fi +if test "${LC_MESSAGES+set}" = set; then LC_MESSAGES=C; export LC_MESSAGES; fi +if test "${LC_CTYPE+set}" = set; then LC_CTYPE=C; export LC_CTYPE; fi + +# confdefs.h avoids OS command line length limits that DEFS can exceed. +rm -rf conftest* confdefs.h +# AIX cpp loses on an empty file, so make sure it contains at least a newline. +echo > confdefs.h + +# A filename unique to this package, relative to the directory that +# configure is in, which we can look for to find out if srcdir is correct. +ac_unique_file=main.c + +# Find the source files, if location was not specified. +if test -z "$srcdir"; then + ac_srcdir_defaulted=yes + # Try the directory containing this script, then its parent. + ac_prog=$0 + ac_confdir=`echo "$ac_prog"|sed 's%/[^/][^/]*$%%'` + test "x$ac_confdir" = "x$ac_prog" && ac_confdir=. + srcdir=$ac_confdir + if test ! -r $srcdir/$ac_unique_file; then + srcdir=.. + fi +else + ac_srcdir_defaulted=no +fi +if test ! -r $srcdir/$ac_unique_file; then + if test "$ac_srcdir_defaulted" = yes; then + { echo "configure: error: cannot find sources in $ac_confdir or .." 1>&2; exit 1; } + else + { echo "configure: error: cannot find sources in $srcdir" 1>&2; exit 1; } + fi +fi +srcdir=`echo "${srcdir}" | sed 's%\([^/]\)/*$%\1%'` + +# Prefer explicitly selected file to automatically selected ones. +if test -z "$CONFIG_SITE"; then + if test "x$prefix" != xNONE; then + CONFIG_SITE="$prefix/share/config.site $prefix/etc/config.site" + else + CONFIG_SITE="$ac_default_prefix/share/config.site $ac_default_prefix/etc/config.site" + fi +fi +for ac_site_file in $CONFIG_SITE; do + if test -r "$ac_site_file"; then + echo "loading site script $ac_site_file" + . "$ac_site_file" + fi +done + +if test -r "$cache_file"; then + echo "loading cache $cache_file" + test -f "$cache_file" && . $cache_file +else + echo "creating cache $cache_file" + > $cache_file +fi + +ac_ext=c +# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options. +ac_cpp='$CPP $CPPFLAGS' +ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5' +ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5' +cross_compiling=$ac_cv_prog_cc_cross + +ac_exeext= +ac_objext=o +if (echo "testing\c"; echo 1,2,3) | grep c >/dev/null; then + # Stardent Vistra SVR4 grep lacks -e, says ghazi@caip.rutgers.edu. + if (echo -n testing; echo 1,2,3) | sed s/-n/xn/ | grep xn >/dev/null; then + ac_n= ac_c=' +' ac_t=' ' + else + ac_n=-n ac_c= ac_t= + fi +else + ac_n= ac_c='\c' ac_t= +fi + + + +case "${CFLAGS+set} $ac_configure_args" in + *" CFLAGS="* );; + "set "*) ac_configure_args="CFLAGS='$CFLAGS' $ac_configure_args";; +esac + + # Extract the first word of "gcc", so it can be a program name with args. +set dummy gcc; ac_word=$2 +echo $ac_n "checking for $ac_word... $ac_c" 1>&6 +echo "configure:566: checking for $ac_word" 1>&5 +if test "${ac_cv_prog_CC+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + if test -n "$CC"; then + ac_cv_prog_CC="$CC" # Let the user override the test. +else + IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":" + ac_dummy="$PATH" + for ac_dir in $ac_dummy; do + test -z "$ac_dir" && ac_dir=. + if test -f $ac_dir/$ac_word; then + ac_cv_prog_CC="gcc" + break + fi + done + IFS="$ac_save_ifs" +fi +fi +CC="$ac_cv_prog_CC" +if test -n "$CC"; then + echo "$ac_t""$CC" 1>&6 +else + echo "$ac_t""no" 1>&6 +fi + + if test -z "$CC"; then + # Extract the first word of "cc", so it can be a program name with args. +set dummy cc; ac_word=$2 +echo $ac_n "checking for $ac_word... $ac_c" 1>&6 +echo "configure:596: checking for $ac_word" 1>&5 +if test "${ac_cv_prog_CC+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + if test -n "$CC"; then + ac_cv_prog_CC="$CC" # Let the user override the test. +else + IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":" + ac_prog_rejected=no + ac_dummy="$PATH" + for ac_dir in $ac_dummy; do + test -z "$ac_dir" && ac_dir=. + if test -f $ac_dir/$ac_word; then + if test "$ac_dir/$ac_word" = "/usr/ucb/cc"; then + ac_prog_rejected=yes + continue + fi + ac_cv_prog_CC="cc" + break + fi + done + IFS="$ac_save_ifs" +if test $ac_prog_rejected = yes; then + # We found a bogon in the path, so make sure we never use it. + set dummy $ac_cv_prog_CC + shift + if test $# -gt 0; then + # We chose a different compiler from the bogus one. + # However, it has the same basename, so the bogon will be chosen + # first if we set CC to just the basename; use the full file name. + shift + set dummy "$ac_dir/$ac_word" "$@" + shift + ac_cv_prog_CC="$@" + fi +fi +fi +fi +CC="$ac_cv_prog_CC" +if test -n "$CC"; then + echo "$ac_t""$CC" 1>&6 +else + echo "$ac_t""no" 1>&6 +fi + + if test -z "$CC"; then + for ac_prog in cl +do +# Extract the first word of "$ac_prog", so it can be a program name with args. +set dummy $ac_prog; ac_word=$2 +echo $ac_n "checking for $ac_word... $ac_c" 1>&6 +echo "configure:647: checking for $ac_word" 1>&5 +if test "${ac_cv_prog_CC+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + if test -n "$CC"; then + ac_cv_prog_CC="$CC" # Let the user override the test. +else + IFS="${IFS= }"; ac_save_ifs="$IFS"; IFS=":" + ac_dummy="$PATH" + for ac_dir in $ac_dummy; do + test -z "$ac_dir" && ac_dir=. + if test -f $ac_dir/$ac_word; then + ac_cv_prog_CC="$ac_prog" + break + fi + done + IFS="$ac_save_ifs" +fi +fi +CC="$ac_cv_prog_CC" +if test -n "$CC"; then + echo "$ac_t""$CC" 1>&6 +else + echo "$ac_t""no" 1>&6 +fi + +test -n "$CC" && break +done + + fi + fi + + +test -z "$CC" && { echo "configure: error: no acceptable cc found in \$PATH" 1>&2; exit 1; } + +echo $ac_n "checking whether the C compiler ($CC $CFLAGS $CPPFLAGS $LDFLAGS) works... $ac_c" 1>&6 +echo "configure:683: checking whether the C compiler ($CC $CFLAGS $CPPFLAGS $LDFLAGS) works" 1>&5 + +ac_ext=c +# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options. +ac_cpp='$CPP $CPPFLAGS' +ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5' +ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5' +cross_compiling=$ac_cv_prog_cc_cross + +cat > conftest.$ac_ext << EOF + +#line 694 "configure" +#include "confdefs.h" + +int main(){return(0);} +EOF +if { (eval echo configure:699: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then + ac_cv_prog_cc_works=yes + # If we can't run a trivial program, we are probably using a cross compiler. + if (./conftest; exit) 2>/dev/null; then + ac_cv_prog_cc_cross=no + else + ac_cv_prog_cc_cross=yes + fi +else + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + ac_cv_prog_cc_works=no +fi +rm -fr conftest* +ac_ext=c +# CFLAGS is not in ac_cpp because -g, -O, etc. are not valid cpp options. +ac_cpp='$CPP $CPPFLAGS' +ac_compile='${CC-cc} -c $CFLAGS $CPPFLAGS conftest.$ac_ext 1>&5' +ac_link='${CC-cc} -o conftest${ac_exeext} $CFLAGS $CPPFLAGS $LDFLAGS conftest.$ac_ext $LIBS 1>&5' +cross_compiling=$ac_cv_prog_cc_cross + +echo "$ac_t""$ac_cv_prog_cc_works" 1>&6 +if test $ac_cv_prog_cc_works = no; then + { echo "configure: error: installation or configuration problem: C compiler cannot create executables." 1>&2; exit 1; } +fi +echo $ac_n "checking whether the C compiler ($CC $CFLAGS $CPPFLAGS $LDFLAGS) is a cross-compiler... $ac_c" 1>&6 +echo "configure:725: checking whether the C compiler ($CC $CFLAGS $CPPFLAGS $LDFLAGS) is a cross-compiler" 1>&5 +echo "$ac_t""$ac_cv_prog_cc_cross" 1>&6 +cross_compiling=$ac_cv_prog_cc_cross + +echo $ac_n "checking whether we are using GNU C... $ac_c" 1>&6 +echo "configure:730: checking whether we are using GNU C" 1>&5 +if test "${ac_cv_prog_gcc+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + cat > conftest.c <&5; (eval $ac_try) 2>&5; }; } | egrep yes >/dev/null 2>&1; then + ac_cv_prog_gcc=yes +else + ac_cv_prog_gcc=no +fi +fi +echo "$ac_t""$ac_cv_prog_gcc" 1>&6 + +if test $ac_cv_prog_gcc = yes; then + GCC=yes +else + GCC= +fi + +ac_test_CFLAGS="${CFLAGS+set}" +ac_save_CFLAGS="$CFLAGS" +CFLAGS= +echo $ac_n "checking whether ${CC-cc} accepts -g... $ac_c" 1>&6 +echo "configure:757: checking whether ${CC-cc} accepts -g" 1>&5 +if test "${ac_cv_prog_cc_g+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + echo 'void f(){}' > conftest.c +if test -z "`${CC-cc} -g -c conftest.c 2>&1`"; then + ac_cv_prog_cc_g=yes +else + ac_cv_prog_cc_g=no +fi +rm -f conftest* + +fi +echo "$ac_t""$ac_cv_prog_cc_g" 1>&6 +if test "$ac_test_CFLAGS" = set; then + CFLAGS="$ac_save_CFLAGS" +elif test $ac_cv_prog_cc_g = yes; then + if test "$GCC" = yes; then + CFLAGS="-g -O2" + else + CFLAGS="-g" + fi +else + if test "$GCC" = yes; then + CFLAGS="-O2" + else + CFLAGS= + fi +fi + + +echo $ac_n "checking for forkpty in -lutil... $ac_c" 1>&6 +echo "configure:789: checking for forkpty in -lutil" 1>&5 +if test "${ac_cv_lib_util_forkpty+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + ac_save_LIBS="$LIBS" +LIBS="-lutil $LIBS" +cat > conftest.$ac_ext <&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then + rm -rf conftest* + ac_cv_lib_util_forkpty=yes +else + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + ac_cv_lib_util_forkpty=no +fi +rm -f conftest* +LIBS="$ac_save_LIBS" +fi +echo "$ac_t""$ac_cv_lib_util_forkpty" 1>&6 +if test $ac_cv_lib_util_forkpty = yes; then + cat >> confdefs.h <&6 +echo "configure:831: checking how to run the C preprocessor" 1>&5 +# On Suns, sometimes $CPP names a directory. +if test -n "$CPP" && test -d "$CPP"; then + CPP= +fi +if test -z "$CPP"; then +if test "${ac_cv_prog_CPP+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + # This must be in double quotes, not single quotes, because CPP may get + # substituted into the Makefile and "${CC-cc}" will confuse make. + CPP="${CC-cc} -E" + # On the NeXT, cc -E runs the code through the compiler's parser, + # not just through cpp. + cat > conftest.$ac_ext < +Syntax Error +EOF +ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out" +{ (eval echo configure:852: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; } +ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"` +if test -z "$ac_err"; then + : +else + echo "$ac_err" >&5 + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + CPP="${CC-cc} -E -traditional-cpp" + cat > conftest.$ac_ext < +Syntax Error +EOF +ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out" +{ (eval echo configure:869: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; } +ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"` +if test -z "$ac_err"; then + : +else + echo "$ac_err" >&5 + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + CPP="${CC-cc} -nologo -E" + cat > conftest.$ac_ext < +Syntax Error +EOF +ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out" +{ (eval echo configure:886: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; } +ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"` +if test -z "$ac_err"; then + : +else + echo "$ac_err" >&5 + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + CPP=/lib/cpp +fi +rm -f conftest* +fi +rm -f conftest* +fi +rm -f conftest* + ac_cv_prog_CPP="$CPP" +fi + CPP="$ac_cv_prog_CPP" +else + ac_cv_prog_CPP="$CPP" +fi +echo "$ac_t""$CPP" 1>&6 + +echo $ac_n "checking for ANSI C header files... $ac_c" 1>&6 +echo "configure:911: checking for ANSI C header files" 1>&5 +if test "${ac_cv_header_stdc+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + cat > conftest.$ac_ext < +#include +#include +#include +EOF +ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out" +{ (eval echo configure:924: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; } +ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"` +if test -z "$ac_err"; then + rm -rf conftest* + ac_cv_header_stdc=yes +else + echo "$ac_err" >&5 + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + ac_cv_header_stdc=no +fi +rm -f conftest* + +if test $ac_cv_header_stdc = yes; then + # SunOS 4.x string.h does not declare mem*, contrary to ANSI. +cat > conftest.$ac_ext < +EOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + egrep "memchr" >/dev/null 2>&1; then + : +else + rm -rf conftest* + ac_cv_header_stdc=no +fi +rm -f conftest* + +fi + +if test $ac_cv_header_stdc = yes; then + # ISC 2.0.2 stdlib.h does not declare free, contrary to ANSI. +cat > conftest.$ac_ext < +EOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + egrep "free" >/dev/null 2>&1; then + : +else + rm -rf conftest* + ac_cv_header_stdc=no +fi +rm -f conftest* + +fi + +if test $ac_cv_header_stdc = yes; then + # /bin/cc in Irix-4.0.5 gets non-ANSI ctype macros unless using -ansi. +if test "$cross_compiling" = yes; then + : +else + cat > conftest.$ac_ext < +#if ((' ' & 0x0FF) == 0x020) +#define ISLOWER(c) ('a' <= (c) && (c) <= 'z') +#define TOUPPER(c) (ISLOWER(c) ? 'A' + ((c) - 'a') : (c)) +#else +#define ISLOWER(c) (('a' <= (c) && (c) <= 'i') \ + || ('j' <= (c) && (c) <= 'r') \ + || ('s' <= (c) && (c) <= 'z')) +#define TOUPPER(c) (ISLOWER(c) ? ((c) | 0x40) : (c)) +#endif +#define XOR(e, f) (((e) && !(f)) || (!(e) && (f))) +int main () { int i; for (i = 0; i < 256; i++) +if (XOR (islower (i), ISLOWER (i)) || toupper (i) != TOUPPER (i)) exit(2); +exit (0); } + +EOF +if { (eval echo configure:998: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext} && (./conftest; exit) 2>/dev/null +then + : +else + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -fr conftest* + ac_cv_header_stdc=no +fi +rm -fr conftest* +fi + +fi +fi +echo "$ac_t""$ac_cv_header_stdc" 1>&6 +if test $ac_cv_header_stdc = yes; then + cat >> confdefs.h <<\EOF +#define STDC_HEADERS 1 +EOF + +fi + +for ac_header in sys/ioctl.h sys/resource.h pty.h termios.h util.h unistd.h +do +ac_ac_Header=`echo "ac_cv_header_$ac_header" | $ac_tr_sh` +echo $ac_n "checking for $ac_header... $ac_c" 1>&6 +echo "configure:1024: checking for $ac_header" 1>&5 +if eval "test \"\${$ac_ac_Header+set}\" = set"; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + cat > conftest.$ac_ext < +EOF +ac_try="$ac_cpp conftest.$ac_ext >/dev/null 2>conftest.out" +{ (eval echo configure:1034: \"$ac_try\") 1>&5; (eval $ac_try) 2>&5; } +ac_err=`grep -v '^ *+' conftest.out | grep -v "^conftest.${ac_ext}\$"` +if test -z "$ac_err"; then + rm -rf conftest* + eval "$ac_ac_Header=yes" +else + echo "$ac_err" >&5 + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + eval "$ac_ac_Header=no" +fi +rm -f conftest* +fi +echo "$ac_t""`eval echo '${'$ac_ac_Header'}'`" 1>&6 +if test `eval echo '${'$ac_ac_Header'}'` = yes; then + cat >> confdefs.h <&6 +echo "configure:1059: checking for pid_t" 1>&5 +if test "${ac_cv_type_pid_t+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + cat > conftest.$ac_ext < +#include +#if STDC_HEADERS +# include +# include +#endif + +EOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + egrep "(^|[^a-zA-Z_0-9])pid_t[^a-zA-Z_0-9]" >/dev/null 2>&1; then + rm -rf conftest* + ac_cv_type_pid_t=yes +else + rm -rf conftest* + ac_cv_type_pid_t=no +fi +rm -f conftest* + +fi +echo "$ac_t""$ac_cv_type_pid_t" 1>&6 +if test $ac_cv_type_pid_t = yes; then + : +else + cat >> confdefs.h <&6 +echo "configure:1098: checking whether ${CC-cc} needs -traditional" 1>&5 +if test "${ac_cv_prog_gcc_traditional+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + ac_pattern="Autoconf.*'x'" + cat > conftest.$ac_ext < +Autoconf TIOCGETP +EOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + egrep "$ac_pattern" >/dev/null 2>&1; then + rm -rf conftest* + ac_cv_prog_gcc_traditional=yes +else + rm -rf conftest* + ac_cv_prog_gcc_traditional=no +fi +rm -f conftest* + + + if test $ac_cv_prog_gcc_traditional = no; then + cat > conftest.$ac_ext < +Autoconf TCGETA +EOF +if (eval "$ac_cpp conftest.$ac_ext") 2>&5 | + egrep "$ac_pattern" >/dev/null 2>&1; then + rm -rf conftest* + ac_cv_prog_gcc_traditional=yes +fi +rm -f conftest* + + fi +fi +echo "$ac_t""$ac_cv_prog_gcc_traditional" 1>&6 + if test $ac_cv_prog_gcc_traditional = yes; then + CC="$CC -traditional" + fi +fi + +echo $ac_n "checking return type of signal handlers... $ac_c" 1>&6 +echo "configure:1143: checking return type of signal handlers" 1>&5 +if test "${ac_cv_type_signal+set}" = set; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + cat > conftest.$ac_ext < +#include +#ifdef signal +#undef signal +#endif +#ifdef __cplusplus +extern "C" void (*signal (int, void (*)(int)))(int); +#else +void (*signal ()) (); +#endif + +int main() { +int i; +; return 0; } +EOF +if { (eval echo configure:1165: \"$ac_compile\") 1>&5; (eval $ac_compile) 2>&5; }; then + rm -rf conftest* + ac_cv_type_signal=void +else + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + ac_cv_type_signal=int +fi +rm -f conftest* +fi +echo "$ac_t""$ac_cv_type_signal" 1>&6 +cat >> confdefs.h <&6 +echo "configure:1186: checking for $ac_func" 1>&5 +if eval "test \"\${$ac_ac_var+set}\" = set"; then + echo $ac_n "(cached) $ac_c" 1>&6 +else + cat > conftest.$ac_ext < +/* Override any gcc2 internal prototype to avoid an error. */ +/* We use char because int might match the return type of a gcc2 + builtin and then its argument prototype would still apply. */ +char $ac_func(); +char (*f)(); + +int main() { + +/* The GNU C library defines this for functions which it implements + to always fail with ENOSYS. Some functions are actually named + something starting with __ and the normal name is an alias. */ +#if defined (__stub_$ac_func) || defined (__stub___$ac_func) +choke me +#else +f = $ac_func; +#endif + +; return 0; } +EOF +if { (eval echo configure:1215: \"$ac_link\") 1>&5; (eval $ac_link) 2>&5; } && test -s conftest${ac_exeext}; then + rm -rf conftest* + eval "$ac_ac_var=yes" +else + echo "configure: failed program was:" >&5 + cat conftest.$ac_ext >&5 + rm -rf conftest* + eval "$ac_ac_var=no" +fi +rm -f conftest* +fi +echo "$ac_t""`eval echo '${'$ac_ac_var'}'`" 1>&6 +if test `eval echo '${'$ac_ac_var'}'` = yes; then + cat >> confdefs.h < confcache <<\EOF +# This file is a shell script that caches the results of configure +# tests run on this system so they can be shared between configure +# scripts and configure runs. It is not useful on other systems. +# If it contains results you don't want to keep, you may remove or edit it. +# +# By default, configure uses ./config.cache as the cache file, +# creating it if it does not exist already. 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This is necessary, for +# example, in the case of _POSIX_SOURCE, which is predefined and required +# on some systems where configure will not decide to define it. +cat >> conftest.vals <<\EOF +s%^[ ]*#[ ]*undef[ ][ ]*[a-zA-Z_][a-zA-Z_0-9]*%/* & */% +EOF + +# Break up conftest.vals because some shells have a limit on the size +# of here documents, and old seds have small limits too (100 cmds). +rm -f conftest.tail +while : +do + ac_lines=`grep -c . conftest.vals` + # grep -c gives empty output for an empty file on some AIX systems. + if test -z "$ac_lines" || test "$ac_lines" -eq 0; then break; fi + # Write a limited-size here document to $ac_cs_root.frag. + echo ' cat > $ac_cs_root.frag <> $CONFIG_STATUS + echo '/^#[ ]*u*n*d*e*f*/!b' >> $CONFIG_STATUS + sed ${ac_max_here_lines}q conftest.vals >> $CONFIG_STATUS + echo 'CEOF + sed -f $ac_cs_root.frag $ac_cs_root.in > $ac_cs_root.out + rm -f $ac_cs_root.in + mv $ac_cs_root.out $ac_cs_root.in +' >> $CONFIG_STATUS + sed 1,${ac_max_here_lines}d conftest.vals > conftest.tail + rm -f conftest.vals + mv conftest.tail conftest.vals +done +rm -f conftest.vals + +cat >> $CONFIG_STATUS <<\EOF + rm -f $ac_cs_root.frag $ac_cs_root.h + echo "/* $ac_file. 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Not all systems have dirname. + ac_dir=`echo $ac_file|sed 's%/[^/][^/]*$%%'` + if test "$ac_dir" != "$ac_file" && test "$ac_dir" != .; then + # The file is in a subdirectory. + test ! -d "$ac_dir" && mkdir "$ac_dir" + fi + rm -f $ac_file + mv $ac_cs_root.h $ac_file + fi +fi; done +EOF +cat >> $CONFIG_STATUS <<\EOF +srcdir=$ac_given_srcdir + +for ac_file in : $CONFIG_LINKS; do if test "x$ac_file" != x:; then + ac_dest=`echo "$ac_file"|sed 's%:.*%%'` + ac_source=`echo "$ac_file"|sed 's%[^:]*:%%'` + + echo "linking $srcdir/$ac_source to $ac_dest" + + if test ! -r $srcdir/$ac_source; then + { echo "configure: error: $srcdir/$ac_source: File not found" 1>&2; exit 1; } + fi + rm -f $ac_dest + + # Make relative symlinks. + # Remove last slash and all that follows it. Not all systems have dirname. + ac_dest_dir=`echo $ac_dest|sed 's%/[^/][^/]*$%%'` + if test "$ac_dest_dir" != "$ac_dest" && test "$ac_dest_dir" != .; then + # The dest file is in a subdirectory. + test ! -d "$ac_dest_dir" && mkdir "$ac_dest_dir" + ac_dest_dir_suffix="/`echo $ac_dest_dir|sed 's%^\./%%'`" + # A "../" for each directory in $ac_dest_dir_suffix. + ac_dots=`echo $ac_dest_dir_suffix|sed 's%/[^/]*%../%g'` + else + ac_dest_dir_suffix= ac_dots= + fi + + case "$srcdir" in + [/$]*) ac_rel_source="$srcdir/$ac_source" ;; + *) ac_rel_source="$ac_dots$srcdir/$ac_source" ;; + esac + + # Make a symlink if possible; otherwise try a hard link. + if ln -s $ac_rel_source $ac_dest 2>/dev/null || + ln $srcdir/$ac_source $ac_dest; then : + else + { echo "configure: error: cannot link $ac_dest to $srcdir/$ac_source" 1>&2; exit 1; } + fi +fi; done +EOF + +cat >> $CONFIG_STATUS <> $CONFIG_STATUS <<\EOF + +exit 0 +EOF +chmod +x $CONFIG_STATUS +rm -fr confdefs* $ac_clean_files +test "$no_create" = yes || $SHELL $CONFIG_STATUS || exit 1 + diff --git a/configure.in b/configure.in new file mode 100644 index 0000000..2e3f736 --- /dev/null +++ b/configure.in @@ -0,0 +1,23 @@ +dnl Process this file with autoconf to produce a configure script. +AC_INIT(main.c) + +dnl Checks for programs. +AC_PROG_CC + +dnl Checks for libraries. +AC_CHECK_LIB(util, forkpty) + +dnl Checks for header files. +AC_HEADER_STDC +AC_CHECK_HEADERS(sys/ioctl.h sys/resource.h pty.h termios.h util.h unistd.h) + +dnl Checks for typedefs, structures, and compiler characteristics. +AC_TYPE_PID_T + +dnl Checks for library functions. +AC_PROG_GCC_TRADITIONAL +AC_TYPE_SIGNAL +AC_CHECK_FUNCS(socket strerror forkpty getrlimit) + +AC_CONFIG_HEADER(config.h) +AC_OUTPUT(Makefile) diff --git a/detach.h b/detach.h new file mode 100644 index 0000000..8cb2b1f --- /dev/null +++ b/detach.h @@ -0,0 +1,91 @@ +/* + dtach - A simple program that emulates the detach feature of screen. + Copyright (C) 2001 Ned T. Crigler + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ +#ifndef detach_h +#define detach_h + +#include "config.h" + +#include +#include +#include +#include +#include + +#ifdef HAVE_PTY_H +#include +#endif + +#ifdef HAVE_UTIL_H +#include +#endif + +#ifdef HAVE_UNISTD_H +#include +#endif + +#ifdef HAVE_SYS_IOCTL_H +#include +#endif + +#ifdef HAVE_SYS_RESOURCE_H +#include +#endif + +#include +#include + +#include +#include +#include + +extern char *progname, *sockname; +extern int detach_char, no_suspend; +extern struct termios orig_term; + +enum +{ + MSG_PUSH, + MSG_WINCH, + MSG_REDRAW, + MSG_ATTACH, + MSG_DETACH +}; + +// The client to master protocol. +struct packet +{ + unsigned char type; + unsigned char len; + union + { + unsigned char buf[sizeof(struct winsize)]; + struct winsize ws; + } u; +}; + +// The master sends a simple stream of text to the attaching clients, without +// any protocol. This might change back to the packet based protocol in the +// future. In the meantime, however, we minimize the amount of data sent back +// and forth between the client and the master. BUFSIZE is the size of the +// buffer used for the text stream. +#define BUFSIZE 4096 + +int attach_main(int noerror); +int master_main(char **argv); +#endif diff --git a/dtach.1 b/dtach.1 new file mode 100644 index 0000000..50b62fd --- /dev/null +++ b/dtach.1 @@ -0,0 +1,153 @@ +.TH dtach 1 "September 2001" "dtach 0.3" +.SH NAME +dtach \- simple program that emulates the detach feature of screen. +.SH SYNOPSIS +.B dtach -a +.I +.br +.B dtach -A +.I +.br +.B dtach -c +.I +.br +.B dtach -n +.I + +.SH DESCRIPTION +.B dtach +is a program that emulates the detach feature of screen. It is designed +to be transparent and un-intrusive; it avoids interpreting the input and output +between attached terminals and the program under its control. Consequently, it +works best with full-screen applications such as emacs. + +.B dtach +is intended for users who want the detach feature of screen without the other +overhead that screen has. It is tiny, does not use many libraries, and stays +out of the way as much as possible. + +.SS SESSIONS +A session in +.B dtach +is a single instance in which a program is running under the control of +.BR dtach . +The program is dissasociated from the original terminal, and is thus protected +from your original terminal being disconnected for some reason. +.PP + +Other instances of +.B dtach +can attach themselves to a particular session. Input and output is copied +between the program running in the +.B dtach +session, and the attached terminals. +.PP + +.B dtach +avoids interpreting the communication stream between the program and the +attached terminals; it instead relies on the ability of the attached terminals +to manage the screen. +.PP + +Sessions are represented by Unix-domain sockets in the filesystem. No other +permission checking other than the filesystem access checks is performed. +.B dtach +creates a master process that monitors the session socket, the program, and any +attached terminals. + +.PP +.SS MODES +.B dtach +has several modes of operation. It can create a new session in which a +program is executed, or it can attach to an already existing session. The first +argument specifies which mode +.B dtach +should operate in. +.TP +.B \-a +Attach to an already existing session. +.B dtach +attaches itself to the session specified by +.IR . +After the attach is completed, the window size of the current terminal is sent +to the master process, and a redraw is also requested. +.TP +.B \-A +Attach to an already existing session, or create a new one. +.B dtach +first tries to attach to the session specified by +.I +if possible. If the attempt to open the socket fails, +.B dtach +tries to create a new session before attaching to it. +.TP +.B \-c +Creates a new session. A new session is created in which the specified program +is executed. +.B dtach +then tries to attach itself to the newly created session. +.TP +.B \-n +Creates a new session, without attaching to it. A new session is created in +which the specified program is executed. +.B dtach +does not try to attach to the newly created session, however, and exits +instead. + +.PP +.SS OPTIONS +.B dtach +has a few options that allow you to modify its behavior. Each attaching +process can have separate settings for these options, which allows for +some flexibility. + +.TP +.BI "\-e " "" +Sets the detach character to +.IR . +When the detach character is pressed, +.B dtach +detaches itself from the current session and exits. The process running in +the session is unaffected by the detach. By default, the detach character is +set to ^\\ (Ctrl-\\). +.TP +.B \-E +Disables the detach character. +.B dtach +does not try to scan input from the terminal for a detach character. The only +way to detach from the session is then by sending the attaching process an +appropriate signal. +.TP +.B \-z +Inhibits processing of the suspend key. +Normally, +.B dtach +will suspend itself when the suspend key is pressed. With this option, the +suspend character is sent to the session instead of being handled by +.BR dtach . + +.PP +.SH EXAMPLES + +The following example creates a new session that has the detach character +and suspend processing disabled. A socket is created in the /tmp directory +for the session. + +.nf + $ dtach -c /tmp/foozle -Ez bash +.fi + +The following example attaches to the /tmp/foozle session if it exists, and if +not, creates a new session using /tmp/foozle as the socket for the session. +Processing of the suspend character is also disabled for the attach instance. + +.nf + $ dtach -A /tmp/foozle -z bash +.fi + +.PP +.SH AUTHORS +Ned T. Crigler . + +.SH "SEE ALSO" +.BR screen "(1)" diff --git a/dtach.spec b/dtach.spec new file mode 100644 index 0000000..d775c33 --- /dev/null +++ b/dtach.spec @@ -0,0 +1,83 @@ +Summary: A simple program that emulates the detach feature of screen. +Name: dtach +Version: 0.3 +Release: 1 +Copyright: GPL +URL: http://people.redhat.com/iweiner/dtach +Group: Applications/System +Source: dtach-%{version}.tar.gz +Prefix: /usr +Buildroot: %{_tmppath}/%{name}-%{version}-buildroot +Obsoletes: detach + +%description +dtach is a program that emulates the detach feature of screen, without the +other overhead that screen has. It is designed to be transparent and +un-intrusive; it avoids interpreting the input and output between attached +terminals and the program under its control. Consequently, it works best with +full-screen applications such as emacs. + +%prep +%setup + +%build +%configure +make + +%install +rm -rf $RPM_BUILD_ROOT/* +mkdir -p $RPM_BUILD_ROOT/%{_bindir} +mkdir -p $RPM_BUILD_ROOT/usr/share/doc/dtach-%{version} +mkdir -p $RPM_BUILD_ROOT/%{_mandir}/man1 +install -m 755 dtach $RPM_BUILD_ROOT/%{_bindir}/dtach +install -m 644 COPYING $RPM_BUILD_ROOT/usr/share/doc/dtach-%{version} +install -m 644 dtach.1 $RPM_BUILD_ROOT/%{_mandir}/man1/dtach.1 + +%clean +make clean +rm -rf $RPM_BUILD_ROOT +rm -rf $RPM_BUILD_DIR/%{name}-%{version} + +%files +%defattr(-,root,root,-) +%doc /usr/share/doc/dtach-%{version}/COPYING +%{_bindir}/dtach +%{_mandir}/man1/* + +%changelog +* Wed Sep 26 2001 Ned T. Crigler 0.3 +- Use getrlimit and dynamically allocate the data structures, if possible. +- Added some more autoconf checks. +- Initial sourceforge release. + +* Thu Sep 20 2001 Ned T. Crigler +- Changed the master to send a stream of text to attaching clients instead + of sending a huge packet all the time. +- Decreased the client <-> master packet size. +- Changed the attach code so that it tells the master when a suspend occurs. + +* Tue Sep 18 2001 Ned T. Crigler +- Fixed a typo in dtach.1 + +* Tue Sep 18 2001 Ned T. Crigler 0.2 +- Removed silly thinko regarding terminal settings in attach, we + always set the terminal to raw mode now. +- Moved redraw code into the master, which tries to be smarter when + using ^L. +- Moved the code that obtains the current terminal settings into main, + preventing a race condition between the master and attach processes. +- Rewrote argument parsing code. +- Changed name to dtach. +- Added a man page. + +* Mon Sep 17 2001 Ned T. Crigler +- Changed fchmod to chmod in create_socket. + +* Mon Sep 17 2001 Isaiah Weiner +- Modified spec file to correct detach binary permissions +- Modified spec file to correct detach documentation path +- Modified spec file URL: to point to http://people.redhat.com/iweiner/detach +- Modified spec file %clean to remove buildroot and builddir. + +* Mon Sep 17 2001 Ned T. Crigler 0.1 +- Initial rpm release. diff --git a/main.c b/main.c new file mode 100644 index 0000000..be6c17a --- /dev/null +++ b/main.c @@ -0,0 +1,216 @@ +/* + dtach - A simple program that emulates the detach feature of screen. + Copyright (C) 2001 Ned T. Crigler + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ +#include "detach.h" + +/* +** detach is a quick hack, since I wanted the detach feature of screen without +** all the other crud. It'll work best with full-screen applications, as it +** does not keep track of the screen or anything like that. +*/ + +// The program version +#define VERSION "0.3" + +// Make sure the binary has a copyright. +const char copyright[] = "dtach - version " VERSION " (C)Copyright 2001 Ned T. Crigler"; + +// argv[0] from the program +char *progname; +// The name of the passed in socket. +char *sockname; +// The character used for detaching. Defaults to '^\' +int detach_char = '\\' - 64; +// 1 if we should not interpret the suspend character. +int no_suspend; + +// The original terminal settings. Shared between the master and attach +// processes. The master uses it to initialize the pty, and the attacher uses +// it to restore the original settings. +struct termios orig_term; + +static void +usage() +{ + printf( + "dtach - version %s, compiled on %s at %s.\n" + "Usage: dtach -a \n" + " dtach -A \n" + " dtach -c \n" + " dtach -n \n" + "Modes:\n" + " -a\t\tAttach to the specified socket.\n" + " -A\t\tAttach to the specified socket, or create it if it\n" + "\t\t does not exist, running the specified command.\n" + " -c\t\tCreate a new socket and run the specified command.\n" + " -n\t\tCreate a new socket and run the specified command " + "detached.\n" + "Options:\n" + " -e \tSet the detach character to , defaults " + "to ^\\.\n" + " -E\t\tDisable the detach character.\n" + " -z\t\tInhibit processing of the suspend key.\n" + "\nReport any bugs to .\n", + VERSION, __DATE__, __TIME__); + exit(0); +} + +int +main(int argc, char **argv) +{ + int mode = 0; + + // Save the program name + progname = argv[0]; + ++argv; --argc; + + // Parse the arguments + if (argc >= 1 && **argv == '-') + { + if (strncmp(*argv, "--help", strlen(*argv)) == 0) + usage(); + else if (strncmp(*argv, "--version", strlen(*argv)) == 0) + { + printf("dtach - version %s, compiled on %s at %s.\n", + VERSION, __DATE__, __TIME__); + return 0; + } + + mode = argv[0][1]; + if (mode == '?') + usage(); + else if (mode != 'a' && mode != 'c' && mode != 'n' && + mode != 'A') + { + printf("%s: Invalid mode '-%c'\n", progname, mode); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + } + if (!mode) + { + printf("%s: No mode was specified.\n", progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + ++argv; --argc; + + if (argc < 1) + { + printf("%s: No socket was specified.\n", progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + sockname = *argv; + ++argv; --argc; + + while (argc >= 1 && **argv == '-') + { + char *p; + + for (p = argv[0] + 1; *p; ++p) + { + if (*p == 'E') + detach_char = -1; + else if (*p == 'z') + no_suspend = 1; + else if (*p == 'e') + { + ++argv; --argc; + if (argc < 1) + { + printf("%s: No escape character " + "specified.\n", progname); + printf("Try '%s -?' for more " + "information.\n", progname); + return 1; + } + if (argv[0][0] == '^' && argv[0][1]) + { + if (argv[0][1] == '?') + detach_char = '\177'; + else + detach_char = argv[0][1] - 64; + } + else + detach_char = argv[0][0]; + break; + } + else + { + printf("%s: Invalid option '-%c'\n", + progname, *p); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + } + ++argv; --argc; + } + + if (mode != 'a' && argc < 1) + { + printf("%s: No command was specified.\n", progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + + // Save the original terminal settings. + if (tcgetattr(0, &orig_term) < 0) + { + printf("%s: tcgetattr: %s\n", progname, strerror(errno)); + return 1; + } + + if (mode == 'a') + { + if (argc > 0) + { + printf("%s: Invalid number of arguments.\n", + progname); + printf("Try '%s -?' for more information.\n", + progname); + return 1; + } + return attach_main(0); + } + else if (mode == 'n') + return master_main(argv); + else if (mode == 'c') + { + if (master_main(argv) != 0) + return 1; + return attach_main(0); + } + else if (mode == 'A') + { + // Try to attach first. If that doesn't work, create a new + // socket. + if (attach_main(1) != 0) + { + if (master_main(argv) != 0) + return 1; + return attach_main(0); + } + } + return 0; +} diff --git a/master.c b/master.c new file mode 100644 index 0000000..e31a6da --- /dev/null +++ b/master.c @@ -0,0 +1,327 @@ +/* + dtach - A simple program that emulates the detach feature of screen. + Copyright (C) 2001 Ned T. Crigler + + This program is free software; you can redistribute it and/or modify + it under the terms of the GNU General Public License as published by + the Free Software Foundation; either version 2 of the License, or + (at your option) any later version. + + This program is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the + GNU General Public License for more details. + + You should have received a copy of the GNU General Public License + along with this program; if not, write to the Free Software + Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA +*/ +#include "detach.h" + +// The pty struct - The pty information is stored here. +struct pty +{ + // File descriptor of the pty + int fd; + // The terminal parameters of the pty. Old and new for comparision + // purposes. + struct termios term; + // The current window size of the pty. + struct winsize ws; +}; + +// The poll structures +static struct pollfd *polls; +// The number of active poll slots +static int num_polls; +// Boolean array for whether a particular connection is attached. +static int *attached; +// The highest file descriptor possible, as returned by getrlimit. +static int highest_fd; + +// The number of fixed slots in the poll structures +#define FIXED_SLOTS 2 + +// Unlink the socket +static void +unlink_socket(void) +{ + unlink(sockname); +} + +// Signal +static RETSIGTYPE +die(int sig) +{ + // Well, the child died. + if (sig == SIGCHLD) + return; + exit(1); +} + +// Initialize the pty structure. +static int +init_pty(struct pty *pty, char **argv) +{ + pid_t pid; + + // Use the original terminal's settings. We don't have to set the + // window size here, because the attacher will send it in a packet. + pty->term = orig_term; + + // Create the pty process + pid = forkpty(&pty->fd, NULL, &pty->term, NULL); + if (pid < 0) + return -1; + else if (pid == 0) + { + int i; + + // Child.. Close some file descriptors and execute the program. + for (i = highest_fd; i > 2; --i) + close(i); + + execvp(*argv, argv); + exit(127); + } + // Parent.. Finish up and return + return 0; +} + +// Creates a new unix domain socket. +static int +create_socket(char *name) +{ + int s; + struct sockaddr_un sun; + + s = socket(PF_UNIX, SOCK_STREAM, 0); + if (s < 0) + return -1; + sun.sun_family = AF_UNIX; + strcpy(sun.sun_path, name); + if (bind(s, (struct sockaddr*)&sun, sizeof(sun)) < 0) + return -1; + if (listen(s, 128) < 0) + return -1; + // chmod it to prevent any suprises + if (chmod(name, 0600) < 0) + return -1; + return s; +} + +// Process activity on a pty - Input and terminal changes are sent out to +// the attached clients. If the pty goes away, we die. +static void +pty_activity(struct pty *pty) +{ + int i, len; + unsigned char buf[BUFSIZE]; + + // Read the pty activity + len = read(pty->fd, buf, sizeof(buf)); + + // Error -> die + if (len <= 0) + exit(1); + + // Get the current terminal settings. + if (tcgetattr(pty->fd, &pty->term) < 0) + exit(1); + + // Send it out to the clients. + for (i = FIXED_SLOTS; i < num_polls; ++i) + { + if (attached[polls[i].fd]) + write(polls[i].fd, buf, len); + } +} + +// Process activity on the control socket +static void +control_activity(int s) +{ + int fd; + + // Accept the new client and link it in. + fd = accept(s, 0, 0); + if (fd < 0) + return; + + // Link it in. + polls[num_polls].fd = fd; + polls[num_polls].events = POLLIN; + polls[num_polls].revents = 0; + attached[fd] = 1; + ++num_polls; +} + +// Process activity from a client. +static void +client_activity(int i, struct pty *pty) +{ + int len; + struct packet pkt; + + // Read the activity. + len = read(polls[i].fd, &pkt, sizeof(pkt)); + if (len <= 0) + { + // Close the socket and go bye bye + attached[polls[i].fd]=0; + close(polls[i].fd); + memcpy(polls + i, polls + i + 1, num_polls - i); + --num_polls; + return; + } + + // Okay, check the command byte. Push out data if we need to. + if (pkt.type == MSG_PUSH) + write(pty->fd, pkt.u.buf, pkt.len); + // Window size change. + else if (pkt.type == MSG_WINCH) + { + pty->ws = pkt.u.ws; + ioctl(pty->fd, TIOCSWINSZ, &pty->ws); + } + // Redraw request? + else if (pkt.type == MSG_REDRAW) + { + char c = '\f'; + + // Guess that ^L might work under certain conditions. + if (((pty->term.c_lflag & (ECHO|ICANON)) == 0) && + (pty->term.c_cc[VMIN] == 1)) + { + write(pty->fd, &c, sizeof(c)); + } + } + // Attach request? + else if (pkt.type == MSG_ATTACH) + attached[polls[i].fd] = 1; + else if (pkt.type == MSG_DETACH) + attached[polls[i].fd] = 0; +} + +// The master process - It watches over the pty process and the attached +// clients. +static void +master_process(int s, char **argv) +{ + struct pty pty; + int i; + +#ifdef HAVE_GETRLIMIT + struct rlimit rlim; + + // Dynamically allocate structures based on the number of file + // descriptors. + + if (getrlimit(RLIMIT_NOFILE, &rlim) < 0) + { + printf("%s: getrlimit: %s\n", progname, strerror(errno)); + exit(1); + } + highest_fd = rlim.rlim_cur; +#else + // We can't query the OS for the number of file descriptors, so + // we pull a number out of the air. + highest_fd = 1024; +#endif + polls = (struct pollfd*)malloc(highest_fd * sizeof(struct pollfd)); + attached = (int*)malloc(highest_fd * sizeof(int)); + + // Okay, disassociate ourselves from the original terminal, as we + // don't care what happens to it. + setsid(); + + // Create a pty in which the process is running. + if (init_pty(&pty, argv) < 0) + { + printf("%s: init_pty: %s\n", progname, strerror(errno)); + exit(1); + } + + // Set up some signals. + signal(SIGPIPE, SIG_IGN); + signal(SIGXFSZ, SIG_IGN); + signal(SIGHUP, SIG_IGN); + signal(SIGTTIN, SIG_IGN); + signal(SIGTTOU, SIG_IGN); + signal(SIGINT, die); + signal(SIGTERM, die); + signal(SIGCHLD, die); + + // Close the original terminal. We are now a daemon. + fclose(stdin); + fclose(stdout); + fclose(stderr); + + // Set a trap to unlink the socket when we die + atexit(unlink_socket); + + // Set up the poll structures. Slot 0 is the control socket, slot 1 + // is the pty, and slot 2 .. n is the connected clients. + polls[0].fd = s; + polls[0].events = POLLIN; + polls[0].revents = 0; + polls[1].fd = pty.fd; + polls[1].events = POLLIN; + polls[1].revents = 0; + num_polls = FIXED_SLOTS; + + // Loop forever. + while (1) + { + // Wait for something to happen. + if (poll(polls, num_polls, -1) < 0) + { + if (errno == EINTR || errno == EAGAIN) + continue; + exit(1); + } + // pty activity? + if (polls[1].revents != 0) + pty_activity(&pty); + // New client? + if (polls[0].revents != 0) + control_activity(s); + // Activity on a client? + for (i = 2; i < num_polls; ++i) + { + if (polls[i].revents != 0) + client_activity(i, &pty); + } + } +} + +int +master_main(char **argv) +{ + int s; + pid_t pid; + + // Create the unix domain socket. + s = create_socket(sockname); + if (s < 0) + { + printf("%s: %s: %s\n", progname, sockname, strerror(errno)); + return 1; + } + + // Fork off so we can daemonize and such + pid = fork(); + if (pid < 0) + { + printf("%s: fork: %s\n", progname, strerror(errno)); + return 1; + } + else if (pid == 0) + { + // Child - this becomes the master + master_process(s, argv); + return 0; + } + // Parent - just return. + return 0; +}