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Add support for systemd socket activation (where systemd creates the Unix

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domain socket for tmux rather than tmux creating it). Build with
--enable-systemd. From Julien Moutinho in GitHub issue 3119.
This commit is contained in:
Nicholas Marriott
2022-03-28 08:42:13 +01:00
parent d26a4ea463
commit fc7f1e7acb
6 changed files with 99 additions and 1 deletions
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58
compat/systemd.c Normal file
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/* $OpenBSD$ */
/*
* Copyright (c) 2022 Nicholas Marriott <nicholas.marriott@gmail.com>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/un.h>
#include <systemd/sd-daemon.h>
#include "tmux.h"
int
systemd_create_socket(int flags, char **cause)
{
int fds;
int fd;
struct sockaddr_un sa;
int addrlen = sizeof sa;
fds = sd_listen_fds(0);
if (fds > 1) { /* too many file descriptors */
errno = E2BIG;
goto fail;
}
if (fds == 1) { /* socket-activated */
fd = SD_LISTEN_FDS_START;
if (!sd_is_socket_unix(fd, SOCK_STREAM, 1, NULL, 0)) {
errno = EPFNOSUPPORT;
goto fail;
}
if (getsockname(fd, (struct sockaddr *)&sa, &addrlen) == -1)
goto fail;
socket_path = xstrdup(sa.sun_path);
return (fd);
}
return (server_create_socket(flags, cause));
fail:
if (cause != NULL)
xasprintf(cause, "systemd socket error (%s)", strerror(errno));
return (-1);
}