diff options
Diffstat (limited to 'src/grp-utils/systemd-socket-activate')
| -rw-r--r-- | src/grp-utils/systemd-socket-activate/Makefile | 35 | ||||
| -rw-r--r-- | src/grp-utils/systemd-socket-activate/activate.c | 545 | ||||
| -rw-r--r-- | src/grp-utils/systemd-socket-activate/systemd-socket-activate.xml | 206 |
3 files changed, 786 insertions, 0 deletions
diff --git a/src/grp-utils/systemd-socket-activate/Makefile b/src/grp-utils/systemd-socket-activate/Makefile new file mode 100644 index 0000000000..dd3e95a5e8 --- /dev/null +++ b/src/grp-utils/systemd-socket-activate/Makefile @@ -0,0 +1,35 @@ +# -*- Mode: makefile; indent-tabs-mode: t -*- +# +# This file is part of systemd. +# +# Copyright 2010-2012 Lennart Poettering +# Copyright 2010-2012 Kay Sievers +# Copyright 2013 Zbigniew Jędrzejewski-Szmek +# Copyright 2013 David Strauss +# Copyright 2016 Luke Shumaker +# +# systemd is free software; you can redistribute it and/or modify it +# under the terms of the GNU Lesser General Public License as published by +# the Free Software Foundation; either version 2.1 of the License, or +# (at your option) any later version. +# +# systemd 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 +# Lesser General Public License for more details. +# +# You should have received a copy of the GNU Lesser General Public License +# along with systemd; If not, see <http://www.gnu.org/licenses/>. +include $(dir $(lastword $(MAKEFILE_LIST)))/../../../config.mk +include $(topsrcdir)/build-aux/Makefile.head.mk + +bin_PROGRAMS += \ + systemd-socket-activate + +systemd_socket_activate_SOURCES = \ + src/activate/activate.c + +systemd_socket_activate_LDADD = \ + libsystemd-shared.la + +include $(topsrcdir)/build-aux/Makefile.tail.mk diff --git a/src/grp-utils/systemd-socket-activate/activate.c b/src/grp-utils/systemd-socket-activate/activate.c new file mode 100644 index 0000000000..2ad205af17 --- /dev/null +++ b/src/grp-utils/systemd-socket-activate/activate.c @@ -0,0 +1,545 @@ +/*** + This file is part of systemd. + + Copyright 2013 Zbigniew Jędrzejewski-Szmek + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +***/ + +#include <getopt.h> +#include <sys/epoll.h> +#include <sys/prctl.h> +#include <sys/socket.h> +#include <sys/wait.h> +#include <unistd.h> + +#include <systemd/sd-daemon.h> + +#include "basic/alloc-util.h" +#include "basic/escape.h" +#include "basic/fd-util.h" +#include "basic/log.h" +#include "basic/macro.h" +#include "basic/signal-util.h" +#include "basic/socket-util.h" +#include "basic/string-util.h" +#include "basic/strv.h" + +static char** arg_listen = NULL; +static bool arg_accept = false; +static int arg_socket_type = SOCK_STREAM; +static char** arg_args = NULL; +static char** arg_setenv = NULL; +static char **arg_fdnames = NULL; +static bool arg_inetd = false; + +static int add_epoll(int epoll_fd, int fd) { + struct epoll_event ev = { + .events = EPOLLIN + }; + int r; + + assert(epoll_fd >= 0); + assert(fd >= 0); + + ev.data.fd = fd; + r = epoll_ctl(epoll_fd, EPOLL_CTL_ADD, fd, &ev); + if (r < 0) + return log_error_errno(errno, "Failed to add event on epoll fd:%d for fd:%d: %m", epoll_fd, fd); + + return 0; +} + +static int open_sockets(int *epoll_fd, bool accept) { + char **address; + int n, fd, r; + int count = 0; + + n = sd_listen_fds(true); + if (n < 0) + return log_error_errno(n, "Failed to read listening file descriptors from environment: %m"); + if (n > 0) { + log_info("Received %i descriptors via the environment.", n); + + for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + n; fd++) { + r = fd_cloexec(fd, arg_accept); + if (r < 0) + return r; + + count++; + } + } + + /* Close logging and all other descriptors */ + if (arg_listen) { + int except[3 + n]; + + for (fd = 0; fd < SD_LISTEN_FDS_START + n; fd++) + except[fd] = fd; + + log_close(); + close_all_fds(except, 3 + n); + } + + /** Note: we leak some fd's on error here. I doesn't matter + * much, since the program will exit immediately anyway, but + * would be a pain to fix. + */ + + STRV_FOREACH(address, arg_listen) { + fd = make_socket_fd(LOG_DEBUG, *address, arg_socket_type, (arg_accept*SOCK_CLOEXEC)); + if (fd < 0) { + log_open(); + return log_error_errno(fd, "Failed to open '%s': %m", *address); + } + + assert(fd == SD_LISTEN_FDS_START + count); + count++; + } + + if (arg_listen) + log_open(); + + *epoll_fd = epoll_create1(EPOLL_CLOEXEC); + if (*epoll_fd < 0) + return log_error_errno(errno, "Failed to create epoll object: %m"); + + for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + count; fd++) { + _cleanup_free_ char *name = NULL; + + getsockname_pretty(fd, &name); + log_info("Listening on %s as %i.", strna(name), fd); + + r = add_epoll(*epoll_fd, fd); + if (r < 0) + return r; + } + + return count; +} + +static int exec_process(const char* name, char **argv, char **env, int start_fd, int n_fds) { + + _cleanup_strv_free_ char **envp = NULL; + _cleanup_free_ char *joined = NULL; + unsigned n_env = 0, length; + const char *tocopy; + char **s; + int r; + + if (arg_inetd && n_fds != 1) { + log_error("--inetd only supported for single file descriptors."); + return -EINVAL; + } + + length = strv_length(arg_setenv); + + /* PATH, TERM, HOME, USER, LISTEN_FDS, LISTEN_PID, LISTEN_FDNAMES, NULL */ + envp = new0(char *, length + 8); + if (!envp) + return log_oom(); + + STRV_FOREACH(s, arg_setenv) { + + if (strchr(*s, '=')) { + char *k; + + k = strdup(*s); + if (!k) + return log_oom(); + + envp[n_env++] = k; + } else { + _cleanup_free_ char *p; + const char *n; + + p = strappend(*s, "="); + if (!p) + return log_oom(); + + n = strv_find_prefix(env, p); + if (!n) + continue; + + envp[n_env] = strdup(n); + if (!envp[n_env]) + return log_oom(); + + n_env++; + } + } + + FOREACH_STRING(tocopy, "TERM=", "PATH=", "USER=", "HOME=") { + const char *n; + + n = strv_find_prefix(env, tocopy); + if (!n) + continue; + + envp[n_env] = strdup(n); + if (!envp[n_env]) + return log_oom(); + + n_env++; + } + + if (arg_inetd) { + assert(n_fds == 1); + + r = dup2(start_fd, STDIN_FILENO); + if (r < 0) + return log_error_errno(errno, "Failed to dup connection to stdin: %m"); + + r = dup2(start_fd, STDOUT_FILENO); + if (r < 0) + return log_error_errno(errno, "Failed to dup connection to stdout: %m"); + + start_fd = safe_close(start_fd); + } else { + if (start_fd != SD_LISTEN_FDS_START) { + assert(n_fds == 1); + + r = dup2(start_fd, SD_LISTEN_FDS_START); + if (r < 0) + return log_error_errno(errno, "Failed to dup connection: %m"); + + safe_close(start_fd); + start_fd = SD_LISTEN_FDS_START; + } + + if (asprintf((char**)(envp + n_env++), "LISTEN_FDS=%i", n_fds) < 0) + return log_oom(); + + if (asprintf((char**)(envp + n_env++), "LISTEN_PID=" PID_FMT, getpid()) < 0) + return log_oom(); + + if (arg_fdnames) { + _cleanup_free_ char *names = NULL; + size_t len; + char *e; + int i; + + len = strv_length(arg_fdnames); + if (len == 1) + for (i = 1; i < n_fds; i++) { + r = strv_extend(&arg_fdnames, arg_fdnames[0]); + if (r < 0) + return log_error_errno(r, "Failed to extend strv: %m"); + } + else if (len != (unsigned) n_fds) + log_warning("The number of fd names is different than number of fds: %zu vs %d", + len, n_fds); + + names = strv_join(arg_fdnames, ":"); + if (!names) + return log_oom(); + + e = strappend("LISTEN_FDNAMES=", names); + if (!e) + return log_oom(); + + envp[n_env++] = e; + } + } + + joined = strv_join(argv, " "); + if (!joined) + return log_oom(); + + log_info("Execing %s (%s)", name, joined); + execvpe(name, argv, envp); + + return log_error_errno(errno, "Failed to execp %s (%s): %m", name, joined); +} + +static int fork_and_exec_process(const char* child, char** argv, char **env, int fd) { + _cleanup_free_ char *joined = NULL; + pid_t parent_pid, child_pid; + + joined = strv_join(argv, " "); + if (!joined) + return log_oom(); + + parent_pid = getpid(); + + child_pid = fork(); + if (child_pid < 0) + return log_error_errno(errno, "Failed to fork: %m"); + + /* In the child */ + if (child_pid == 0) { + + (void) reset_all_signal_handlers(); + (void) reset_signal_mask(); + + /* Make sure the child goes away when the parent dies */ + if (prctl(PR_SET_PDEATHSIG, SIGTERM) < 0) + _exit(EXIT_FAILURE); + + /* Check whether our parent died before we were able + * to set the death signal */ + if (getppid() != parent_pid) + _exit(EXIT_SUCCESS); + + exec_process(child, argv, env, fd, 1); + _exit(EXIT_FAILURE); + } + + log_info("Spawned %s (%s) as PID %d", child, joined, child_pid); + return 0; +} + +static int do_accept(const char* name, char **argv, char **envp, int fd) { + _cleanup_free_ char *local = NULL, *peer = NULL; + _cleanup_close_ int fd_accepted = -1; + + fd_accepted = accept4(fd, NULL, NULL, 0); + if (fd_accepted < 0) + return log_error_errno(errno, "Failed to accept connection on fd:%d: %m", fd); + + getsockname_pretty(fd_accepted, &local); + getpeername_pretty(fd_accepted, true, &peer); + log_info("Connection from %s to %s", strna(peer), strna(local)); + + return fork_and_exec_process(name, argv, envp, fd_accepted); +} + +/* SIGCHLD handler. */ +static void sigchld_hdl(int sig) { + PROTECT_ERRNO; + + for (;;) { + siginfo_t si; + int r; + + si.si_pid = 0; + r = waitid(P_ALL, 0, &si, WEXITED|WNOHANG); + if (r < 0) { + if (errno != ECHILD) + log_error_errno(errno, "Failed to reap children: %m"); + return; + } + if (si.si_pid == 0) + return; + + log_info("Child %d died with code %d", si.si_pid, si.si_status); + } +} + +static int install_chld_handler(void) { + static const struct sigaction act = { + .sa_flags = SA_NOCLDSTOP, + .sa_handler = sigchld_hdl, + }; + + int r; + + r = sigaction(SIGCHLD, &act, 0); + if (r < 0) + return log_error_errno(errno, "Failed to install SIGCHLD handler: %m"); + + return 0; +} + +static void help(void) { + printf("%s [OPTIONS...]\n\n" + "Listen on sockets and launch child on connection.\n\n" + "Options:\n" + " -h --help Show this help and exit\n" + " --version Print version string and exit\n" + " -l --listen=ADDR Listen for raw connections at ADDR\n" + " -d --datagram Listen on datagram instead of stream socket\n" + " --seqpacket Listen on SOCK_SEQPACKET instead of stream socket\n" + " -a --accept Spawn separate child for each connection\n" + " -E --setenv=NAME[=VALUE] Pass an environment variable to children\n" + " --fdname=NAME[:NAME...] Specify names for file descriptors\n" + " --inetd Enable inetd file descriptor passing protocol\n" + "\n" + "Note: file descriptors from sd_listen_fds() will be passed through.\n" + , program_invocation_short_name); +} + +static int parse_argv(int argc, char *argv[]) { + enum { + ARG_VERSION = 0x100, + ARG_FDNAME, + ARG_SEQPACKET, + ARG_INETD, + }; + + static const struct option options[] = { + { "help", no_argument, NULL, 'h' }, + { "version", no_argument, NULL, ARG_VERSION }, + { "datagram", no_argument, NULL, 'd' }, + { "seqpacket", no_argument, NULL, ARG_SEQPACKET }, + { "listen", required_argument, NULL, 'l' }, + { "accept", no_argument, NULL, 'a' }, + { "setenv", required_argument, NULL, 'E' }, + { "environment", required_argument, NULL, 'E' }, /* legacy alias */ + { "fdname", required_argument, NULL, ARG_FDNAME }, + { "inetd", no_argument, NULL, ARG_INETD }, + {} + }; + + int c, r; + + assert(argc >= 0); + assert(argv); + + while ((c = getopt_long(argc, argv, "+hl:aE:d", options, NULL)) >= 0) + switch(c) { + case 'h': + help(); + return 0; + + case ARG_VERSION: + return version(); + + case 'l': + r = strv_extend(&arg_listen, optarg); + if (r < 0) + return log_oom(); + + break; + + case 'd': + if (arg_socket_type == SOCK_SEQPACKET) { + log_error("--datagram may not be combined with --seqpacket."); + return -EINVAL; + } + + arg_socket_type = SOCK_DGRAM; + break; + + case ARG_SEQPACKET: + if (arg_socket_type == SOCK_DGRAM) { + log_error("--seqpacket may not be combined with --datagram."); + return -EINVAL; + } + + arg_socket_type = SOCK_SEQPACKET; + break; + + case 'a': + arg_accept = true; + break; + + case 'E': + r = strv_extend(&arg_setenv, optarg); + if (r < 0) + return log_oom(); + + break; + + case ARG_FDNAME: { + _cleanup_strv_free_ char **names; + char **s; + + names = strv_split(optarg, ":"); + if (!names) + return log_oom(); + + STRV_FOREACH(s, names) + if (!fdname_is_valid(*s)) { + _cleanup_free_ char *esc; + + esc = cescape(*s); + log_warning("File descriptor name \"%s\" is not valid.", esc); + } + + /* Empty optargs means one empty name */ + r = strv_extend_strv(&arg_fdnames, + strv_isempty(names) ? STRV_MAKE("") : names, + false); + if (r < 0) + return log_error_errno(r, "strv_extend_strv: %m"); + break; + } + + case ARG_INETD: + arg_inetd = true; + break; + + case '?': + return -EINVAL; + + default: + assert_not_reached("Unhandled option"); + } + + if (optind == argc) { + log_error("%s: command to execute is missing.", + program_invocation_short_name); + return -EINVAL; + } + + if (arg_socket_type == SOCK_DGRAM && arg_accept) { + log_error("Datagram sockets do not accept connections. " + "The --datagram and --accept options may not be combined."); + return -EINVAL; + } + + arg_args = argv + optind; + + return 1 /* work to do */; +} + +int main(int argc, char **argv, char **envp) { + int r, n; + int epoll_fd = -1; + + log_parse_environment(); + log_open(); + + r = parse_argv(argc, argv); + if (r <= 0) + return r == 0 ? EXIT_SUCCESS : EXIT_FAILURE; + + r = install_chld_handler(); + if (r < 0) + return EXIT_FAILURE; + + n = open_sockets(&epoll_fd, arg_accept); + if (n < 0) + return EXIT_FAILURE; + if (n == 0) { + log_error("No sockets to listen on specified or passed in."); + return EXIT_FAILURE; + } + + for (;;) { + struct epoll_event event; + + r = epoll_wait(epoll_fd, &event, 1, -1); + if (r < 0) { + if (errno == EINTR) + continue; + + log_error_errno(errno, "epoll_wait() failed: %m"); + return EXIT_FAILURE; + } + + log_info("Communication attempt on fd %i.", event.data.fd); + if (arg_accept) { + r = do_accept(argv[optind], argv + optind, envp, event.data.fd); + if (r < 0) + return EXIT_FAILURE; + } else + break; + } + + exec_process(argv[optind], argv + optind, envp, SD_LISTEN_FDS_START, n); + + return EXIT_SUCCESS; +} diff --git a/src/grp-utils/systemd-socket-activate/systemd-socket-activate.xml b/src/grp-utils/systemd-socket-activate/systemd-socket-activate.xml new file mode 100644 index 0000000000..2cf3a7d377 --- /dev/null +++ b/src/grp-utils/systemd-socket-activate/systemd-socket-activate.xml @@ -0,0 +1,206 @@ +<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> +<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" +"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> + +<!-- + This file is part of systemd. + + Copyright 2013 Zbigniew Jędrzejewski-Szmek + + systemd is free software; you can redistribute it and/or modify it + under the terms of the GNU Lesser General Public License as published by + the Free Software Foundation; either version 2.1 of the License, or + (at your option) any later version. + + systemd 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 + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public License + along with systemd; If not, see <http://www.gnu.org/licenses/>. +--> + +<refentry id="systemd-socket-activate" + xmlns:xi="http://www.w3.org/2001/XInclude"> + + <refentryinfo> + <title>systemd-socket-activate</title> + <productname>systemd</productname> + + <authorgroup> + <author> + <contrib>Developer</contrib> + <firstname>Zbigniew</firstname> + <surname>Jędrzejewski-Szmek</surname> + <email>zbyszek@in.waw.pl</email> + </author> + </authorgroup> + </refentryinfo> + + <refmeta> + <refentrytitle>systemd-socket-activate</refentrytitle> + <manvolnum>1</manvolnum> + </refmeta> + + <refnamediv> + <refname>systemd-socket-activate</refname> + <refpurpose>Test socket activation of daemons</refpurpose> + </refnamediv> + + <refsynopsisdiv> + <cmdsynopsis> + <command>systemd-socket-activate</command> + <arg choice="opt" rep="repeat">OPTIONS</arg> + <arg choice="plain"><replaceable>daemon</replaceable></arg> + <arg choice="opt" rep="repeat">OPTIONS</arg> + </cmdsynopsis> + </refsynopsisdiv> + + <refsect1> + <title>Description</title> + + <para><command>systemd-socket-activate</command> may be used to launch a socket-activated service binary from the command + line for testing purposes. It may also be used to launch individual instances of the service binary per connection. + </para> + + <para>The daemon to launch and its options should be specified + after options intended for <command>systemd-socket-activate</command>. + </para> + + <para>If the <option>--inetd</option> option is given, the socket file descriptor will be used as the standard + input and output of the launched process. Otherwise, standard input and output will be inherited, and sockets will + be passed through file descriptors 3 and higher. Sockets passed through <varname>$LISTEN_FDS</varname> to + <command>systemd-socket-activate</command> will be passed through to the daemon, in the original positions. Other sockets + specified with <option>--listen=</option> will use consecutive descriptors. By default, + <command>systemd-socket-activate</command> listens on a stream socket, use <option>--datagram</option> and + <option>--seqpacket</option> to listen on datagram or sequential packet sockets instead (see below). + </para> + </refsect1> + + <refsect1> + <title>Options</title> + <variablelist> + <varlistentry> + <term><option>-l <replaceable>address</replaceable></option></term> + <term><option>--listen=<replaceable>address</replaceable></option></term> + + <listitem><para>Listen on this <replaceable>address</replaceable>. + Takes a string like <literal>2000</literal> or + <literal>127.0.0.1:2001</literal>.</para> + </listitem> + </varlistentry> + + <varlistentry> + <term><option>-a</option></term> + <term><option>--accept</option></term> + + <listitem><para>Launch an instance of the service binary for each connection and pass the connection + socket.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>-d</option></term> + <term><option>--datagram</option></term> + + <listitem><para>Listen on a datagram socket (<constant>SOCK_DGRAM</constant>), instead of a stream socket + (<constant>SOCK_STREAM</constant>). May not be combined with <option>--seqpacket</option>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--seqpacket</option></term> + + <listitem><para>Listen on a sequential packet socket (<constant>SOCK_SEQPACKET</constant>), instead of a stream + socket (<constant>SOCK_STREAM</constant>). May not be combined with + <option>--datagram</option>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--inetd</option></term> + + <listitem><para>Use the inetd protocol for passing file descriptors, i.e. as standard input and standard + output, instead of the new-style protocol for passing file descriptors using <varname>$LISTEN_FDS</varname> + (see above).</para></listitem> + </varlistentry> + + <varlistentry> + <term><option>-E <replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term> + <term><option>--setenv=<replaceable>VAR</replaceable><optional>=<replaceable>VALUE</replaceable></optional></option></term> + + <listitem><para>Add this variable to the environment of the + launched process. If <replaceable>VAR</replaceable> is + followed by <literal>=</literal>, assume that it is a + variable–value pair. Otherwise, obtain the value from the + environment of <command>systemd-socket-activate</command> itself. + </para></listitem> + </varlistentry> + + <varlistentry> + <term><option>--fdname=</option><replaceable>NAME</replaceable><optional>:<replaceable>NAME</replaceable>...</optional></term> + + <listitem><para>Specify names for the file descriptors passed. This is equivalent to setting + <varname>FileDescriptorName=</varname> in socket unit files, and enables use of + <citerefentry><refentrytitle>sd_listen_fds_with_names</refentrytitle><manvolnum>3</manvolnum></citerefentry>. + Multiple entries may be specifies using separate options or by separating names with colons + (<literal>:</literal>) in one option. In case more names are given than descriptors, superfluous ones willl be + ignored. In case less names are given than descriptors, the remaining file descriptors will be unnamed. + </para></listitem> + </varlistentry> + + <xi:include href="standard-options.xml" xpointer="help" /> + <xi:include href="standard-options.xml" xpointer="version" /> + </variablelist> + </refsect1> + + <refsect1> + <title>Environment variables</title> + <variablelist class='environment-variables'> + <varlistentry> + <term><varname>$LISTEN_FDS</varname></term> + <term><varname>$LISTEN_PID</varname></term> + <term><varname>$LISTEN_FDNAMES</varname></term> + + <listitem><para>See + <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>.</para></listitem> + </varlistentry> + + <varlistentry> + <term><varname>$SYSTEMD_LOG_TARGET</varname></term> + <term><varname>$SYSTEMD_LOG_LEVEL</varname></term> + <term><varname>$SYSTEMD_LOG_COLOR</varname></term> + <term><varname>$SYSTEMD_LOG_LOCATION</varname></term> + + <listitem><para>Same as in + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>.</para></listitem> + </varlistentry> + </variablelist> + </refsect1> + + <refsect1> + <title>Examples</title> + + <example> + <title>Run an echo server on port 2000</title> + + <programlisting>$ systemd-socket-activate -l 2000 --inetd -a cat</programlisting> + </example> + + <example> + <title>Run a socket-activated instance of <citerefentry><refentrytitle>systemd-journal-gatewayd</refentrytitle><manvolnum>8</manvolnum></citerefentry></title> + + <programlisting>$ systemd-socket-activate -l 19531 /usr/lib/systemd/systemd-journal-gatewayd</programlisting> + </example> + </refsect1> + + <refsect1> + <title>See Also</title> + <para> + <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.socket</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>systemd.service</refentrytitle><manvolnum>5</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_listen_fds</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry><refentrytitle>sd_listen_fds_with_names</refentrytitle><manvolnum>3</manvolnum></citerefentry>, + <citerefentry project='man-pages'><refentrytitle>cat</refentrytitle><manvolnum>1</manvolnum></citerefentry> + </para> + </refsect1> +</refentry> |