diff --git a/.builds/alpine.yml b/.builds/alpine.yml
new file mode 100644
index 0000000..bbf26fb
--- /dev/null
+++ b/.builds/alpine.yml
@@ -0,0 +1,11 @@
+image: alpine/edge
+sources:
+  - https://github.com/martanne/abduco
+tasks:
+  - build: |
+      cd abduco
+      ./configure
+      make
+  - test: |
+      cd abduco
+      ./testsuite.sh
diff --git a/.builds/debian.yml b/.builds/debian.yml
new file mode 100644
index 0000000..a4f42a0
--- /dev/null
+++ b/.builds/debian.yml
@@ -0,0 +1,11 @@
+image: debian/stable
+sources:
+  - https://github.com/martanne/abduco
+tasks:
+  - build: |
+      cd abduco
+      ./configure
+      make
+  - test: |
+      cd abduco
+      ./testsuite.sh
diff --git a/.builds/freebsd.yml b/.builds/freebsd.yml
new file mode 100644
index 0000000..0927677
--- /dev/null
+++ b/.builds/freebsd.yml
@@ -0,0 +1,11 @@
+image: freebsd/latest
+sources:
+  - https://github.com/martanne/abduco
+tasks:
+  - build: |
+      cd abduco
+      ./configure
+      make
+  - test: |
+      cd abduco
+      ./testsuite.sh
diff --git a/.builds/openbsd.yml b/.builds/openbsd.yml
new file mode 100644
index 0000000..59d1b5f
--- /dev/null
+++ b/.builds/openbsd.yml
@@ -0,0 +1,11 @@
+image: openbsd/latest
+sources:
+  - https://github.com/martanne/abduco
+tasks:
+  - build: |
+      cd abduco
+      ./configure
+      make
+  - test: |
+      cd abduco
+      ./testsuite.sh
diff --git a/.github/workflows/coverity-scan.yml b/.github/workflows/coverity-scan.yml
new file mode 100644
index 0000000..0f2b2bb
--- /dev/null
+++ b/.github/workflows/coverity-scan.yml
@@ -0,0 +1,46 @@
+name: Coverity Scan
+
+env:
+  PROJECT: abduco
+
+on:
+  schedule:
+    - cron: '0 0 * * 0' # once a week
+
+jobs:
+  scan:
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Download Coverity Build Tool
+      run: |
+        wget -q https://scan.coverity.com/download/cxx/linux64 --post-data "token=$TOKEN&project=martanne/${PROJECT}" -O cov-analysis-linux64.tar.gz
+        mkdir cov-analysis-linux64
+        tar xzf cov-analysis-linux64.tar.gz --strip 1 -C cov-analysis-linux64
+      env:
+        TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}
+
+    - name: Configure
+      run: ./configure
+
+    - name: Build with cov-build
+      run: |
+        export PATH=$(pwd)/cov-analysis-linux64/bin:$PATH
+        cov-build --dir cov-int make
+
+    - name: Submit the result to Coverity Scan
+      run: |
+        tar czvf ${PROJECT}.tgz cov-int
+        curl \
+          --form project=martanne/${PROJECT} \
+          --form token=$TOKEN \
+          --form email=mat@brain-dump.org \
+          --form file=@${PROJECT}.tgz \
+          --form version=trunk \
+          --form description="`./${PROJECT} -v`" \
+          https://scan.coverity.com/builds?project=martanne/${PROJECT}
+      env:
+        TOKEN: ${{ secrets.COVERITY_SCAN_TOKEN }}
diff --git a/.github/workflows/man.yml b/.github/workflows/man.yml
new file mode 100644
index 0000000..9c3b020
--- /dev/null
+++ b/.github/workflows/man.yml
@@ -0,0 +1,44 @@
+name: Manual
+
+env:
+  PROJECT: abduco
+
+on:
+  push:
+    paths:
+    - '*.1'
+
+jobs:
+  man:
+    runs-on: ubuntu-latest
+    steps:
+
+    - name: Checkout
+      uses: actions/checkout@v2
+
+    - name: Dependency
+      run: sudo apt install mandoc
+
+    - name: Manual generation
+      run: |
+        mkdir man
+        sed -e "s/VERSION/$(git describe --always)/" ${PROJECT}.1 | \
+          mandoc -W warning -T utf8 -T html -O man=%N.%S.html -O style=mandoc.css 1> \
+          "man/${PROJECT}.1.html" || true
+        wget 'https://cvsweb.bsd.lv/~checkout~/mandoc/mandoc.css?rev=1.46&content-type=text/plain' -O man/mandoc.css
+        ln -sf "${PROJECT}.1.html" man/index.html
+
+    - name: Upload
+      env:
+        DEPLOY_TOKEN: ${{ secrets.GIT_DEPLOY_TOKEN }}
+      run: |
+        git clone --depth=1 --single-branch --branch gh-pages "https://x-access-token:${DEPLOY_TOKEN}@github.com/${GITHUB_REPOSITORY}.git" /tmp/gh-pages
+        git config --global user.name "${GITHUB_ACTOR}"
+        git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
+        mkdir -p /tmp/gh-pages/man
+        rm -f /tmp/gh-pages/man/*
+        cp -av man/*.html /tmp/gh-pages/man/
+        cp -av man/*.css /tmp/gh-pages/man/
+        cd /tmp/gh-pages
+        git add -A && git commit --allow-empty -am "Publishing from ${GITHUB_REPOSITORY} ${GITHUB_SHA}"
+        git push origin gh-pages
diff --git a/.gitignore b/.gitignore
index 2ae5602..a859e4b 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,7 +1,9 @@
-# normal ignores
-.*
-*.[ao]
-*.lo
-*.so
-tags
-!.gitignore
+/config.h
+/config.mk
+/abduco
+*.css
+*.gcda
+*.gcno
+*.gcov
+*.html
+*.o
diff --git a/Makefile b/Makefile
index 88a5df8..d59909b 100644
--- a/Makefile
+++ b/Makefile
@@ -8,6 +8,10 @@ CFLAGS_STD += -DVERSION=\"${VERSION}\"
 LDFLAGS_STD ?= -lc -lutil
 
 STRIP ?= strip
+INSTALL ?= install
+
+PREFIX ?= /usr/local
+SHAREDIR ?= ${PREFIX}/share
 
 SRC = abduco.c
 
@@ -33,22 +37,31 @@ dist: clean
 	@echo creating dist tarball
 	@git archive --prefix=abduco-${VERSION}/ -o abduco-${VERSION}.tar.gz HEAD
 
-install: abduco
-	@echo stripping executable
-	@${STRIP} abduco
+installdirs:
+	@${INSTALL} -d ${DESTDIR}${PREFIX}/bin \
+		${DESTDIR}${MANPREFIX}/man1
+
+install: abduco installdirs
 	@echo installing executable file to ${DESTDIR}${PREFIX}/bin
-	@mkdir -p ${DESTDIR}${PREFIX}/bin
-	@cp -f abduco ${DESTDIR}${PREFIX}/bin
-	@chmod 755 ${DESTDIR}${PREFIX}/bin/abduco
+	@${INSTALL} -m 0755 abduco ${DESTDIR}${PREFIX}/bin
 	@echo installing manual page to ${DESTDIR}${MANPREFIX}/man1
 	@mkdir -p ${DESTDIR}${MANPREFIX}/man1
 	@sed "s/VERSION/${VERSION}/g" < abduco.1 > ${DESTDIR}${MANPREFIX}/man1/abduco.1
 	@chmod 644 ${DESTDIR}${MANPREFIX}/man1/abduco.1
 
+install-strip: install
+	${STRIP} ${DESTDIR}${PREFIX}/bin/abduco
+
+install-completion:
+	@echo installing zsh completion file to ${DESTDIR}${SHAREDIR}/zsh/site-functions
+	@install -Dm644 contrib/abduco.zsh ${DESTDIR}${SHAREDIR}/zsh/site-functions/_abduco
+
 uninstall:
 	@echo removing executable file from ${DESTDIR}${PREFIX}/bin
 	@rm -f ${DESTDIR}${PREFIX}/bin/abduco
 	@echo removing manual page from ${DESTDIR}${MANPREFIX}/man1
 	@rm -f ${DESTDIR}${MANPREFIX}/man1/abduco.1
+	@echo removing zsh completion file from ${DESTDIR}${SHAREDIR}/zsh/site-functions
+	@rm -f ${DESTDIR}${SHAREDIR}/zsh/site-functions/_abduco
 
-.PHONY: all clean dist install uninstall debug
+.PHONY: all clean dist install installdirs install-strip install-completion uninstall debug
diff --git a/README.md b/README.md
index e0250f9..fdcc92b 100644
--- a/README.md
+++ b/README.md
@@ -7,9 +7,9 @@ run in the background - and then later reattached. Together with
 [dvtm](http://www.brain-dump.org/projects/dvtm) it provides a
 simpler and cleaner alternative to tmux or screen.
 
-![abduco+dvtm demo](https://raw.githubusercontent.com/martanne/abduco/gh-pages/screencast.gif)
+![abduco+dvtm demo](https://raw.githubusercontent.com/martanne/abduco/gh-pages/screencast.gif#center)
 
-abduco is in many ways very similar to [dtach]("http://dtach.sf.net)
+abduco is in many ways very similar to [dtach](http://dtach.sf.net)
 but is a completely independent implementation which is actively maintained,
 contains no legacy code, provides a few additional features, has a
 cleaner, more robust implementation and is distributed under the
@@ -34,23 +34,13 @@ cleaner, more robust implementation and is distributed under the
 
 ## Download
 
-Either download the latest source tarball
-[abduco-0.5.tar.gz](http://www.brain-dump.org/projects/abduco/abduco-0.5.tar.gz)
-with sha1sum
-
-    37c51a0d5c3dd216251d84d5c1b550f119ad53c9  abduco-0.5.tar.gz
-
+Either download the latest [source tarball](https://github.com/martanne/abduco/releases),
 compile and install it
 
     ./configure && make && sudo make install
 
-or use one of the distribution provided binary packages:
-
- * [Debian](https://packages.debian.org/search?keywords=abduco)
- * [Fedora](https://admin.fedoraproject.org/pkgdb/package/abduco/)
- * [Gentoo](http://packages.gentoo.org/package/app-misc/abduco/)
- * [Ubuntu](http://packages.ubuntu.com/search?keywords=abduco)
- * [Mac OS X](http://www.braumeister.org/formula/abduco) via homebrew
+or use one of the distribution provided
+[binary packages](https://repology.org/project/abduco/packages).
 
 ## Quickstart
 
@@ -167,21 +157,14 @@ command line options.
 
 ## Development
 
-You can always fetch the current code base from the git repository.
+You can always fetch the current code base from the git repository
+located at [Github](https://github.com/martanne/abduco/) or
+[Sourcehut](https://git.sr.ht/~martanne/abduco).
 
-    git clone https://github.com/martanne/abduco.git
-
-or
-
-    git clone git://repo.or.cz/abduco.git
-
-If you have comments, suggestions, ideas, a bug report, a patch or something
-else related to abduco then write to the
+If you have comments, suggestions, ideas, a bug report, a patch or
+something else related to abduco then write to the
 [suckless developer mailing list](http://suckless.org/community)
-or contact me directly mat[at]brain-dump.org.
-
-[![Build Status](https://travis-ci.org/martanne/abduco.svg?branch=master)](https://travis-ci.org/martanne/abduco)
-[![Coverity Scan Build Status](https://scan.coverity.com/projects/4285/badge.svg)](https://scan.coverity.com/projects/4285)
+or contact me directly.
 
 ### Debugging
 
@@ -194,8 +177,8 @@ to temporary files as follows:
 
 If you want to run client and server with one command (e.g. using the `-c`
 option) then within `gdb` the option `set follow-fork-mode {child,parent}`
-might be useful. Similarly to get a syscall trace `strace -o abduco -ff [abduco-cmd]`
-proved to be handy.
+might be useful. Similarly to get a syscall trace `strace -o abduco -ff
+[abduco-cmd]` proved to be handy.
 
 ## License
 
diff --git a/abduco.1 b/abduco.1
index b4c4f4b..187643a 100644
--- a/abduco.1
+++ b/abduco.1
@@ -60,16 +60,17 @@ are relayed to the command supervised by the server.
 .Pp
 .Nm
 operates on the raw I/O byte stream without interpreting any terminal
-escape sequences. As a consequence the terminal state is not preserved
-across sessions. If this functionality is desired, it should be provided
-by another utility such as
+escape sequences.
+As a consequence the terminal state is not preserved across sessions.
+If this functionality is desired, it should be provided by another
+utility such as
 .Xr dvtm 1 .
 .
 .Ss ACTIONS
 .
 If no command line arguments are given, all currently active sessions are
-listed sorted by their respective creation date. Lines starting with an
-asterisk
+listed sorted by their respective creation date.
+Lines starting with an asterisk
 .Pq *
 indicate that at least one client is currently connected.
 A plus sign
@@ -101,7 +102,8 @@ Additionally the following options can be provided to further tweak
 the behavior.
 .Bl -tag -width indent
 .It Fl e Ar detachkey
-Set the key to detach. Defaults to
+Set the key to detach.
+Defaults to
 .Aq Ctrl+\e
 which is specified as ^\\ i.e. Ctrl is represented as a caret
 .Pq ^ .
@@ -111,7 +113,8 @@ after showing its exit status.
 .It Fl l
 Attach with the lowest priority, meaning this client will be the last to control the size.
 .It Fl p
-Pass through content of standard input to the session. Implies the
+Pass through content of standard input to the session.
+Implies the
 .Fl q
 and
 .Fl l
@@ -225,7 +228,7 @@ Or in a slightly more interactive fashion.
 .Xr tmux 1 ,
 .Xr screen 1
 .
-.Sh AUTHOR
+.Sh AUTHORS
 .Nm
 is written by
 .An Marc André Tanner Aq mat at brain-dump.org
diff --git a/abduco.c b/abduco.c
index 5bf4dde..f1f7b86 100644
--- a/abduco.c
+++ b/abduco.c
@@ -463,7 +463,7 @@ static bool create_session(const char *name, char * const argv[]) {
 				sa.sa_handler = SIG_IGN;
 				sigaction(SIGPIPE, &sa, NULL);
 				sigaction(SIGHUP, &sa, NULL);
-				if (chdir("/") == -1)    /* should not happen, just to make the compiler happy */
+				if (chdir("/") == -1)
 					_exit(EXIT_FAILURE);
 			#ifdef NDEBUG
 				int fd = open("/dev/null", O_RDWR);
@@ -501,8 +501,7 @@ static bool create_session(const char *name, char * const argv[]) {
 		return false;
 	default: /* parent = client process */
 		close(client_pipe[1]);
-		int status;
-		wait(&status); /* wait for first fork */
+		while (waitpid(pid, NULL, 0) == -1 && errno == EINTR);
 		ssize_t len = read_all(client_pipe[0], errormsg, sizeof(errormsg));
 		if (len > 0) {
 			write_all(STDERR_FILENO, errormsg, len);
@@ -758,6 +757,7 @@ int main(int argc, char *argv[]) {
 			die("create-session");
 		if (action == 'n')
 			break;
+		/* fall through */
 	case 'a':
 		if (!attach_session(server.session_name, true))
 			die("attach-session");
diff --git a/contrib/abduco.zsh b/contrib/abduco.zsh
new file mode 100644
index 0000000..e8e94d1
--- /dev/null
+++ b/contrib/abduco.zsh
@@ -0,0 +1,35 @@
+#compdef abduco
+
+typeset -A opt_args
+
+_abduco_sessions() {
+  declare -a sessions
+  sessions=( $(abduco | sed '1d;s/.*\t[0-9][0-9]*\t//') )
+  _describe -t session 'session' sessions
+}
+
+_abduco_firstarg() {
+  if (( $+opt_args[-a] || $+opt_args[-A] )); then
+    _abduco_sessions
+  elif (( $+opt_args[-c] || $+opt_args[-n] )); then
+    _guard "^-*" 'session name'
+  elif [[ -z $words[CURRENT] ]]; then
+    compadd "$@" -S '' -- -
+  fi
+}
+
+_arguments -s \
+  '(-a -A -c -n -f)-a[attach to an existing session]' \
+  '(-a -A -c -n)-A[attach to a session, create if does not exist]' \
+  '(-a -A -c -n -l)-c[create a new session and attach to it]' \
+  '(-a -A -c -n -l)-n[create a new session but do not attach to it]' \
+  '-e[set the detachkey (default: ^\\)]:detachkey' \
+  '(-a)-f[force create the session]' \
+  '(-q)-p[pass-through mode]' \
+  '-q[be quiet]' \
+  '-r[read-only session, ignore user input]' \
+  '(-c -n)-l[attach with the lowest priority]' \
+  '(-)-v[show version information and exit]' \
+  '1: :_abduco_firstarg' \
+  '2:command:_path_commands' \
+  '*:: :{ shift $((CURRENT-3)) words; _precommand; }'
diff --git a/testsuite.sh b/testsuite.sh
index ccb86fa..d6c73be 100755
--- a/testsuite.sh
+++ b/testsuite.sh
@@ -7,6 +7,9 @@ ABDUCO_OPTS="-e ^\\"
 [ ! -z "$1" ] && ABDUCO="$1"
 [ ! -x "$ABDUCO" ] && echo "usage: $0 /path/to/abduco" && exit 1
 
+TESTS_OK=0
+TESTS_RUN=0
+
 detach() {
 	sleep 1
 	printf ""
@@ -74,12 +77,14 @@ run_test_attached() {
 	local output="$name.out"
 	local output_expected="$name.expected"
 
+	TESTS_RUN=$((TESTS_RUN + 1))
 	echo -n "Running test attached: $name "
 	expected_abduco_attached_output "$name" "$cmd" > "$output_expected" 2>&1
-	$ABDUCO -c "$name" $cmd 2>&1 | sed 's/.$//' > "$output"
 
-	if diff -u "$output_expected" "$output" && check_environment; then
+	if $ABDUCO -c "$name" $cmd 2>&1 | sed 's/.$//' > "$output" && sleep 1 &&
+	   diff -u "$output_expected" "$output" && check_environment; then
 		rm "$output" "$output_expected"
+		TESTS_OK=$((TESTS_OK + 1))
 		echo "OK"
 		return 0
 	else
@@ -97,6 +102,7 @@ run_test_detached() {
 	local output="$name.out"
 	local output_expected="$name.expected"
 
+	TESTS_RUN=$((TESTS_RUN + 1))
 	echo -n "Running test detached: $name "
 	expected_abduco_detached_output "$name" "$cmd" > "$output_expected" 2>&1
 
@@ -104,6 +110,7 @@ run_test_detached() {
 	   $ABDUCO -a "$name" 2>&1 | sed 's/.$//' > "$output" &&
 	   diff -u "$output_expected" "$output" && check_environment; then
 		rm "$output" "$output_expected"
+		TESTS_OK=$((TESTS_OK + 1))
 		echo "OK"
 		return 0
 	else
@@ -121,6 +128,7 @@ run_test_attached_detached() {
 	local output="$name.out"
 	local output_expected="$name.expected"
 
+	TESTS_RUN=$((TESTS_RUN + 1))
 	echo -n "Running test: $name "
 	$cmd >/dev/null 2>&1
 	expected_abduco_epilog "$name" $? > "$output_expected" 2>&1
@@ -129,6 +137,7 @@ run_test_attached_detached() {
 	   $ABDUCO -a "$name" 2>&1 | tail -1 | sed 's/.$//' > "$output" &&
 	   diff -u "$output_expected" "$output" && check_environment; then
 		rm "$output" "$output_expected"
+		TESTS_OK=$((TESTS_OK + 1))
 		echo "OK"
 		return 0
 	else
@@ -144,6 +153,7 @@ run_test_dvtm() {
 		return 0;
 	fi
 
+	TESTS_RUN=$((TESTS_RUN + 1))
 	local name="dvtm"
 	local output="$name.out"
 	local output_expected="$name.expected"
@@ -152,6 +162,7 @@ run_test_dvtm() {
 	if dvtm_session | $ABDUCO -c "$name" > "$output" 2>&1 &&
 	   diff -u "$output_expected" "$output" && check_environment; then
 		rm "$output" "$output_expected"
+		TESTS_OK=$((TESTS_OK + 1))
 		echo "OK"
 		return 0
 	else
@@ -162,8 +173,8 @@ run_test_dvtm() {
 
 test_non_existing_command || echo "Execution of non existing command FAILED"
 
-run_test_attached "seq" "seq 1 1000"
-run_test_detached "seq" "seq 1 1000"
+run_test_attached "awk" "awk 'BEGIN {for(i=1;i<=1000;i++) print i}'"
+run_test_detached "awk" "awk 'BEGIN {for(i=1;i<=1000;i++) print i}'"
 
 run_test_attached "false" "false"
 run_test_detached "false" "false"
@@ -200,3 +211,5 @@ run_test_attached_detached "attach-detach" "./long-running.sh"
 rm ./long-running.sh
 
 run_test_dvtm
+
+[ $TESTS_OK -eq $TESTS_RUN ]