mirror of
https://github.com/checkpoint-restore/criu
synced 2025-08-22 09:58:09 +00:00
2e15e4da92
Makes the criu RPC socket socket-activated with systemd [1], meaning that systemd will create and listen to the UNIX socket /var/run/criu-srvice.socket on behalf of criu until a connection comes in, when it will then pass control of the socket, along with the first connection over to a newly spawned criu daemon. This is similar to inetd, but criu stays around after getting started, listening itsself on the socket. [1] http://0pointer.de/blog/projects/socket-activation.html v2: stripped down sd-daemon.[ch] moved units to scripts/sd v3: stripped down further by removing unneeded includes Signed-off-by: Shawn Landden <shawn@churchofgit.com> Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
133 lines
3.3 KiB
C
133 lines
3.3 KiB
C
/* stripped down version */
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/***
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Copyright 2010 Lennart Poettering
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Permission is hereby granted, free of charge, to any person
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obtaining a copy of this software and associated documentation files
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(the "Software"), to deal in the Software without restriction,
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including without limitation the rights to use, copy, modify, merge,
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publish, distribute, sublicense, and/or sell copies of the Software,
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and to permit persons to whom the Software is furnished to do so,
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subject to the following conditions:
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The above copyright notice and this permission notice shall be
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included in all copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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***/
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#ifndef _GNU_SOURCE
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# define _GNU_SOURCE
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#endif
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#include <stdlib.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <errno.h>
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#include "sd-daemon.h"
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#if (__GNUC__ >= 4)
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# ifdef SD_EXPORT_SYMBOLS
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/* Export symbols */
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# define _sd_export_ __attribute__ ((visibility("default")))
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# else
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/* Don't export the symbols */
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# define _sd_export_ __attribute__ ((visibility("hidden")))
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# endif
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#else
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# define _sd_export_
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#endif
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_sd_export_ int sd_listen_fds(int unset_environment) {
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#if defined(DISABLE_SYSTEMD) || !defined(__linux__)
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return 0;
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#else
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int r, fd;
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const char *e;
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char *p = NULL;
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unsigned long l;
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e = getenv("LISTEN_PID");
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if (!e) {
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r = 0;
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goto finish;
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}
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errno = 0;
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l = strtoul(e, &p, 10);
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if (errno > 0) {
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r = -errno;
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goto finish;
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}
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if (!p || p == e || *p || l <= 0) {
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r = -EINVAL;
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goto finish;
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}
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/* Is this for us? */
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if (getpid() != (pid_t) l) {
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r = 0;
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goto finish;
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}
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e = getenv("LISTEN_FDS");
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if (!e) {
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r = 0;
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goto finish;
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}
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errno = 0;
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l = strtoul(e, &p, 10);
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if (errno > 0) {
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r = -errno;
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goto finish;
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}
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if (!p || p == e || *p) {
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r = -EINVAL;
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goto finish;
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}
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for (fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + (int) l; fd ++) {
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int flags;
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flags = fcntl(fd, F_GETFD);
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if (flags < 0) {
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r = -errno;
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goto finish;
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}
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if (flags & FD_CLOEXEC)
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continue;
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if (fcntl(fd, F_SETFD, flags | FD_CLOEXEC) < 0) {
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r = -errno;
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goto finish;
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}
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}
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r = (int) l;
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finish:
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if (unset_environment) {
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unsetenv("LISTEN_PID");
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unsetenv("LISTEN_FDS");
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}
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return r;
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#endif
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}
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