2 * Copyright (c) 2008, 2009, 2010, 2011, 2012, 2013, 2015 Nicira, Inc.
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at:
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
19 #include "daemon-private.h"
27 #include <sys/resource.h>
34 #include "command-line.h"
35 #include "fatal-signal.h"
38 #include "ovs-thread.h"
40 #include "socket-util.h"
43 #include "openvswitch/vlog.h"
45 VLOG_DEFINE_THIS_MODULE(daemon_unix
);
59 /* --detach: Should we run in the background? */
60 bool detach
; /* Was --detach specified? */
61 static bool detached
; /* Have we already detached? */
63 /* --pidfile: Name of pidfile (null if none). */
66 /* Device and inode of pidfile, so we can avoid reopening it. */
67 static dev_t pidfile_dev
;
68 static ino_t pidfile_ino
;
70 /* --overwrite-pidfile: Create pidfile even if one already exists and is
72 static bool overwrite_pidfile
;
74 /* --no-chdir: Should we chdir to "/"? */
75 static bool chdir_
= true;
77 /* File descriptor used by daemonize_start() and daemonize_complete(). */
78 static int daemonize_fd
= -1;
80 /* --monitor: Should a supervisory process monitor the daemon and restart it if
81 * it dies due to an error signal? */
84 /* --user: Only root can use this option. Switch to new uid:gid after
85 * initially running as root. */
86 static bool switch_user
= false;
89 static char *user
= NULL
;
90 static void daemon_become_new_user__(bool access_datapath
);
92 static void check_already_running(void);
93 static int lock_pidfile(FILE *, int command
);
94 static pid_t
fork_and_clean_up(void);
95 static void daemonize_post_detach(void);
97 /* Returns the file name that would be used for a pidfile if 'name' were
98 * provided to set_pidfile(). The caller must free the returned string. */
100 make_pidfile_name(const char *name
)
103 ? xasprintf("%s/%s.pid", ovs_rundir(), program_name
)
104 : abs_file_name(ovs_rundir(), name
));
107 /* Sets that we do not chdir to "/". */
114 /* Normally, daemonize() or damonize_start() will terminate the program with a
115 * message if a locked pidfile already exists. If this function is called, an
116 * existing pidfile will be replaced, with a warning. */
118 ignore_existing_pidfile(void)
120 overwrite_pidfile
= true;
123 /* Sets up a following call to daemonize() to detach from the foreground
124 * session, running this process in the background. */
131 /* Sets up a following call to daemonize() to fork a supervisory process to
132 * monitor the daemon and restart it if it dies due to an error signal. */
134 daemon_set_monitor(void)
139 /* If a pidfile has been configured, creates it and stores the running
140 * process's pid in it. Ensures that the pidfile will be deleted when the
145 long int pid
= getpid();
151 /* Create a temporary pidfile. */
152 if (overwrite_pidfile
) {
153 tmpfile
= xasprintf("%s.tmp%ld", pidfile
, pid
);
154 fatal_signal_add_file_to_unlink(tmpfile
);
156 /* Everyone shares the same file which will be treated as a lock. To
157 * avoid some uncomfortable race conditions, we can't set up the fatal
158 * signal unlink until we've acquired it. */
159 tmpfile
= xasprintf("%s.tmp", pidfile
);
162 file
= fopen(tmpfile
, "a+");
164 VLOG_FATAL("%s: create failed (%s)", tmpfile
, ovs_strerror(errno
));
167 error
= lock_pidfile(file
, F_SETLK
);
169 /* Looks like we failed to acquire the lock. Note that, if we failed
170 * for some other reason (and '!overwrite_pidfile'), we will have
171 * left 'tmpfile' as garbage in the file system. */
172 VLOG_FATAL("%s: fcntl(F_SETLK) failed (%s)", tmpfile
,
173 ovs_strerror(error
));
176 if (!overwrite_pidfile
) {
177 /* We acquired the lock. Make sure to clean up on exit, and verify
178 * that we're allowed to create the actual pidfile. */
179 fatal_signal_add_file_to_unlink(tmpfile
);
180 check_already_running();
183 if (fstat(fileno(file
), &s
) == -1) {
184 VLOG_FATAL("%s: fstat failed (%s)", tmpfile
, ovs_strerror(errno
));
187 if (ftruncate(fileno(file
), 0) == -1) {
188 VLOG_FATAL("%s: truncate failed (%s)", tmpfile
, ovs_strerror(errno
));
191 fprintf(file
, "%ld\n", pid
);
192 if (fflush(file
) == EOF
) {
193 VLOG_FATAL("%s: write failed (%s)", tmpfile
, ovs_strerror(errno
));
196 error
= rename(tmpfile
, pidfile
);
198 /* Due to a race, 'tmpfile' may be owned by a different process, so we
199 * shouldn't delete it on exit. */
200 fatal_signal_remove_file_to_unlink(tmpfile
);
203 VLOG_FATAL("failed to rename \"%s\" to \"%s\" (%s)",
204 tmpfile
, pidfile
, ovs_strerror(errno
));
207 /* Ensure that the pidfile will get deleted on exit. */
208 fatal_signal_add_file_to_unlink(pidfile
);
212 * We don't close 'file' because its file descriptor must remain open to
214 pidfile_dev
= s
.st_dev
;
215 pidfile_ino
= s
.st_ino
;
219 /* Calls fork() and on success returns its return value. On failure, logs an
220 * error and exits unsuccessfully.
222 * Post-fork, but before returning, this function calls a few other functions
223 * that are generally useful if the child isn't planning to exec a new
226 fork_and_clean_up(void)
230 /* Running in parent process. */
233 /* Running in child process. */
241 * - In the parent, waits for the child to signal that it has completed its
242 * startup sequence. Then stores -1 in '*fdp' and returns the child's
243 * pid in '*child_pid' argument.
245 * - In the child, stores a fd in '*fdp' and returns 0 through '*child_pid'
246 * argument. The caller should pass the fd to fork_notify_startup() after
247 * it finishes its startup sequence.
249 * Returns 0 on success. If something goes wrong and child process was not
250 * able to signal its readiness by calling fork_notify_startup(), then this
251 * function returns -1. However, even in case of failure it still sets child
252 * process id in '*child_pid'. */
254 fork_and_wait_for_startup(int *fdp
, pid_t
*child_pid
)
262 pid
= fork_and_clean_up();
264 /* Running in parent process. */
269 if (read_fully(fds
[0], &c
, 1, &bytes_read
) != 0) {
274 retval
= waitpid(pid
, &status
, 0);
275 } while (retval
== -1 && errno
== EINTR
);
278 if (WIFEXITED(status
) && WEXITSTATUS(status
)) {
279 /* Child exited with an error. Convey the same error
280 * to our parent process as a courtesy. */
281 exit(WEXITSTATUS(status
));
283 char *status_msg
= process_status_msg(status
);
284 VLOG_ERR("fork child died before signaling startup (%s)",
288 } else if (retval
< 0) {
289 VLOG_FATAL("waitpid failed (%s)", ovs_strerror(errno
));
297 /* Running in child process. */
306 fork_notify_startup(int fd
)
309 size_t bytes_written
;
312 error
= write_fully(fd
, "", 1, &bytes_written
);
314 VLOG_FATAL("pipe write failed (%s)", ovs_strerror(error
));
322 should_restart(int status
)
324 if (WIFSIGNALED(status
)) {
325 static const int error_signals
[] = {
326 /* This list of signals is documented in daemon.man. If you
327 * change the list, update the documentation too. */
328 SIGABRT
, SIGALRM
, SIGBUS
, SIGFPE
, SIGILL
, SIGPIPE
, SIGSEGV
,
334 for (i
= 0; i
< ARRAY_SIZE(error_signals
); i
++) {
335 if (error_signals
[i
] == WTERMSIG(status
)) {
344 monitor_daemon(pid_t daemon_pid
)
346 /* XXX Should log daemon's stderr output at startup time. */
350 bool child_ready
= true;
352 set_subprogram_name("monitor");
353 status_msg
= xstrdup("healthy");
354 last_restart
= TIME_MIN
;
360 ovs_cmdl_proctitle_set("monitoring pid %lu (%s)",
361 (unsigned long int) daemon_pid
, status_msg
);
366 retval
= waitpid(daemon_pid
, &status
, 0);
367 error
= retval
== -1 ? errno
: 0;
368 } while (error
== EINTR
);
369 vlog_reopen_log_file();
371 VLOG_FATAL("waitpid failed (%s)", ovs_strerror(error
));
375 if (!child_ready
|| retval
== daemon_pid
) {
376 char *s
= process_status_msg(status
);
377 if (should_restart(status
)) {
379 status_msg
= xasprintf("%d crashes: pid %lu died, %s",
381 (unsigned long int) daemon_pid
, s
);
384 if (WCOREDUMP(status
)) {
385 /* Disable further core dumps to save disk space. */
390 if (setrlimit(RLIMIT_CORE
, &r
) == -1) {
391 VLOG_WARN("failed to disable core dumps: %s",
392 ovs_strerror(errno
));
396 /* Throttle restarts to no more than once every 10 seconds. */
397 if (time(NULL
) < last_restart
+ 10) {
398 VLOG_WARN("%s, waiting until 10 seconds since last "
399 "restart", status_msg
);
401 time_t now
= time(NULL
);
402 time_t wakeup
= last_restart
+ 10;
406 xsleep(wakeup
- now
);
409 last_restart
= time(NULL
);
411 VLOG_ERR("%s, restarting", status_msg
);
412 child_ready
= !fork_and_wait_for_startup(&daemonize_fd
,
414 if (child_ready
&& !daemon_pid
) {
415 /* Child process needs to break out of monitoring
420 VLOG_INFO("pid %lu died, %s, exiting",
421 (unsigned long int) daemon_pid
, s
);
429 /* Running in new daemon process. */
430 ovs_cmdl_proctitle_restore();
431 set_subprogram_name("");
434 /* If daemonization is configured, then starts daemonization, by forking and
435 * returning in the child process. The parent process hangs around until the
436 * child lets it know either that it completed startup successfully (by calling
437 * daemon_complete()) or that it failed to start up (by exiting with a nonzero
440 daemonize_start(bool access_datapath
)
442 assert_single_threaded();
446 daemon_become_new_user__(access_datapath
);
453 if (fork_and_wait_for_startup(&daemonize_fd
, &pid
)) {
454 VLOG_FATAL("could not detach from foreground session");
457 /* Running in parent process. */
461 /* Running in daemon or monitor process. */
466 int saved_daemonize_fd
= daemonize_fd
;
469 if (fork_and_wait_for_startup(&daemonize_fd
, &daemon_pid
)) {
470 VLOG_FATAL("could not initiate process monitoring");
472 if (daemon_pid
> 0) {
473 /* Running in monitor process. */
474 fork_notify_startup(saved_daemonize_fd
);
476 close_standard_fds();
478 monitor_daemon(daemon_pid
);
480 /* Running in daemon process. */
483 forbid_forking("running in daemon process");
489 /* Make sure that the unixctl commands for vlog get registered in a
490 * daemon, even before the first log message. */
494 /* If daemonization is configured, then this function notifies the parent
495 * process that the child process has completed startup successfully. It also
496 * call daemonize_post_detach().
498 * Calling this function more than once has no additional effect. */
500 daemonize_complete(void)
510 fork_notify_startup(daemonize_fd
);
512 daemonize_post_detach();
516 /* If daemonization is configured, then this function does traditional Unix
517 * daemonization behavior: join a new session, chdir to the root (if not
518 * disabled), and close the standard file descriptors.
520 * It only makes sense to call this function as part of an implementation of a
521 * special daemon subprocess. A normal daemon should just call
522 * daemonize_complete(). */
524 daemonize_post_detach(void)
530 close_standard_fds();
538 "\nDaemon options:\n"
539 " --detach run in background as daemon\n"
540 " --monitor creates a process to monitor this daemon\n"
541 " --user=username[:group] changes the effective daemon user:group\n"
542 " --no-chdir do not chdir to '/'\n"
543 " --pidfile[=FILE] create pidfile (default: %s/%s.pid)\n"
544 " --overwrite-pidfile with --pidfile, start even if already "
546 ovs_rundir(), program_name
);
550 lock_pidfile__(FILE *file
, int command
, struct flock
*lck
)
554 lck
->l_type
= F_WRLCK
;
555 lck
->l_whence
= SEEK_SET
;
561 error
= fcntl(fileno(file
), command
, lck
) == -1 ? errno
: 0;
562 } while (error
== EINTR
);
567 lock_pidfile(FILE *file
, int command
)
571 return lock_pidfile__(file
, command
, &lck
);
575 read_pidfile__(const char *pidfile_
, bool delete_if_stale
)
583 if ((pidfile_ino
|| pidfile_dev
)
584 && !stat(pidfile_
, &s
)
585 && s
.st_ino
== pidfile_ino
&& s
.st_dev
== pidfile_dev
) {
586 /* It's our own pidfile. We can't afford to open it, because closing
587 * *any* fd for a file that a process has locked also releases all the
588 * locks on that file.
590 * Fortunately, we know the associated pid anyhow: */
594 file
= fopen(pidfile_
, "r+");
596 if (errno
== ENOENT
&& delete_if_stale
) {
600 VLOG_WARN("%s: open: %s", pidfile_
, ovs_strerror(error
));
604 error
= lock_pidfile__(file
, F_GETLK
, &lck
);
606 VLOG_WARN("%s: fcntl: %s", pidfile_
, ovs_strerror(error
));
609 if (lck
.l_type
== F_UNLCK
) {
610 /* pidfile exists but it isn't locked by anyone. We need to delete it
611 * so that a new pidfile can go in its place. But just calling
612 * unlink(pidfile) makes a nasty race: what if someone else unlinks it
613 * before we do and then replaces it by a valid pidfile? We'd unlink
614 * their valid pidfile. We do a little dance to avoid the race, by
615 * locking the invalid pidfile. Only one process can have the invalid
616 * pidfile locked, and only that process has the right to unlink it. */
617 if (!delete_if_stale
) {
619 VLOG_DBG("%s: pid file is stale", pidfile_
);
624 error
= lock_pidfile(file
, F_SETLK
);
626 /* We lost a race with someone else doing the same thing. */
627 VLOG_WARN("%s: lost race to lock pidfile", pidfile_
);
631 /* Is the file we have locked still named 'pidfile_'? */
632 if (stat(pidfile_
, &s
) || fstat(fileno(file
), &s2
)
633 || s
.st_ino
!= s2
.st_ino
|| s
.st_dev
!= s2
.st_dev
) {
634 /* No. We lost a race with someone else who got the lock before
635 * us, deleted the pidfile, and closed it (releasing the lock). */
637 VLOG_WARN("%s: lost race to delete pidfile", pidfile_
);
641 /* We won the right to delete the stale pidfile. */
642 if (unlink(pidfile_
)) {
644 VLOG_WARN("%s: failed to delete stale pidfile (%s)",
645 pidfile_
, ovs_strerror(error
));
648 VLOG_DBG("%s: deleted stale pidfile", pidfile_
);
653 if (!fgets(line
, sizeof line
, file
)) {
656 VLOG_WARN("%s: read: %s", pidfile_
, ovs_strerror(error
));
659 VLOG_WARN("%s: read: unexpected end of file", pidfile_
);
664 if (lck
.l_pid
!= strtoul(line
, NULL
, 10)) {
665 /* The process that has the pidfile locked is not the process that
666 * created it. It must be stale, with the process that has it locked
667 * preparing to delete it. */
669 VLOG_WARN("%s: stale pidfile for pid %s being deleted by pid %ld",
670 pidfile_
, line
, (long int) lck
.l_pid
);
684 /* Opens and reads a PID from 'pidfile_'. Returns the positive PID if
685 * successful, otherwise a negative errno value. */
687 read_pidfile(const char *pidfile_
)
689 return read_pidfile__(pidfile_
, false);
692 /* Checks whether a process with the given 'pidfile' is already running and,
693 * if so, aborts. If 'pidfile' is stale, deletes it. */
695 check_already_running(void)
697 long int pid
= read_pidfile__(pidfile
, true);
699 VLOG_FATAL("%s: already running as pid %ld, aborting", pidfile
, pid
);
700 } else if (pid
< 0) {
701 VLOG_FATAL("%s: pidfile check failed (%s), aborting",
702 pidfile
, ovs_strerror(-pid
));
707 /* stub functions for non-windows platform. */
710 service_start(int *argc OVS_UNUSED
, char **argv
[] OVS_UNUSED
)
720 should_service_stop(void)
727 gid_matches(gid_t expected
, gid_t value
)
729 return expected
== -1 || expected
== value
;
733 gid_verify(gid_t gid_
)
739 return (gid_matches(gid_
, r
) &&
740 gid_matches(gid_
, e
));
744 daemon_switch_group(gid_t gid_
)
746 if ((setgid(gid_
) == -1) || !gid_verify(gid_
)) {
747 VLOG_FATAL("%s: fail to switch group to gid as %d, aborting",
753 uid_matches(uid_t expected
, uid_t value
)
755 return expected
== -1 || expected
== value
;
759 uid_verify(const uid_t uid_
)
765 return (uid_matches(uid_
, r
) &&
766 uid_matches(uid_
, e
));
770 daemon_switch_user(const uid_t uid_
, const char *user_
)
772 if ((setuid(uid_
) == -1) || !uid_verify(uid_
)) {
773 VLOG_FATAL("%s: fail to switch user to %s, aborting",
778 /* Use portable Unix APIs to switch uid:gid, when datapath
779 * access is not required. On Linux systems, all capabilities
780 * will be dropped. */
782 daemon_become_new_user_unix(void)
784 /* "Setuid Demystified" by Hao Chen, etc outlines some caveats of
785 * around unix system call setuid() and friends. This implementation
786 * mostly follow the advice given by the paper. The paper is
787 * published in 2002, so things could have changed. */
789 /* Change both real and effective uid and gid will permanently
790 * drop the process' privilege. "Setuid Demystified" suggested
791 * that calling getuid() after each setuid() call to verify they
792 * are actually set, because checking return code alone is not
794 daemon_switch_group(gid
);
795 if (user
&& initgroups(user
, gid
) == -1) {
796 VLOG_FATAL("%s: fail to add supplementary group gid %d, "
797 "aborting", pidfile
, gid
);
799 daemon_switch_user(uid
, user
);
802 /* Linux specific implementation of daemon_become_new_user()
803 * using libcap-ng. */
805 daemon_become_new_user_linux(bool access_datapath OVS_UNUSED
)
807 #if defined __linux__ && HAVE_LIBCAPNG
810 ret
= capng_get_caps_process();
813 if (capng_have_capabilities(CAPNG_SELECT_CAPS
) > CAPNG_NONE
) {
814 const capng_type_t cap_sets
= CAPNG_EFFECTIVE
|CAPNG_PERMITTED
;
816 capng_clear(CAPNG_SELECT_BOTH
);
818 ret
= capng_update(CAPNG_ADD
, cap_sets
, CAP_IPC_LOCK
)
819 || capng_update(CAPNG_ADD
, cap_sets
, CAP_NET_BIND_SERVICE
);
821 if (access_datapath
&& !ret
) {
822 ret
= capng_update(CAPNG_ADD
, cap_sets
, CAP_NET_ADMIN
)
823 || capng_update(CAPNG_ADD
, cap_sets
, CAP_NET_RAW
)
824 || capng_update(CAPNG_ADD
, cap_sets
, CAP_NET_BROADCAST
);
832 /* CAPNG_INIT_SUPP_GRP will be a better choice than
833 * CAPNG_DROP_SUPP_GRP. However this enum value is only defined
834 * with libcap-ng higher than version 0.7.4, which is not wildly
835 * available on many Linux distributions yet. Taking a more
836 * conservative approach to make sure OVS behaves consistently.
838 * XXX We may change this for future OVS releases.
840 ret
= capng_change_id(uid
, gid
, CAPNG_DROP_SUPP_GRP
841 | CAPNG_CLEAR_BOUNDING
);
845 VLOG_FATAL("%s: libcap-ng fail to switch to user and group "
846 "%d:%d, aborting", pidfile
, uid
, gid
);
852 daemon_become_new_user__(bool access_datapath
)
854 /* If vlog file has been created, change its owner to the non-root user
855 * as specifed by the --user option. */
856 vlog_change_owner_unix(uid
, gid
);
860 daemon_become_new_user_linux(access_datapath
);
862 VLOG_FATAL("%s: fail to downgrade user using libcap-ng. "
863 "(libcap-ng is not configured at compile time), "
864 "aborting.", pidfile
);
867 daemon_become_new_user_unix();
871 /* Noramlly, user switch is embedded within daemonize_start().
872 * However, there in case the user switch needs to be done
873 * before daemonize_start(), the following API can be used. */
875 daemon_become_new_user(bool access_datapath
)
877 assert_single_threaded();
879 daemon_become_new_user__(access_datapath
);
880 /* daemonize_start() should not switch user again. */
885 /* Return the maximun suggested buffer size for both getpwname_r()
888 * This size may still not be big enough. in case getpwname_r()
889 * and friends return ERANGE, a larger buffer should be supplied to
890 * retry. (The man page did not specify the max size to stop at, we
891 * will keep trying with doubling the buffer size for each round until
892 * the size wrapps around size_t. */
894 get_sysconf_buffer_size(void)
896 size_t bufsize
, pwd_bs
= 0, grp_bs
= 0;
897 const size_t default_bufsize
= 1024;
900 if ((pwd_bs
= sysconf(_SC_GETPW_R_SIZE_MAX
)) == -1) {
902 VLOG_FATAL("%s: Read initial passwordd struct size "
903 "failed (%s), aborting. ", pidfile
,
904 ovs_strerror(errno
));
908 if ((grp_bs
= sysconf(_SC_GETGR_R_SIZE_MAX
)) == -1) {
910 VLOG_FATAL("%s: Read initial group struct size "
911 "failed (%s), aborting. ", pidfile
,
912 ovs_strerror(errno
));
916 bufsize
= MAX(pwd_bs
, grp_bs
);
917 return bufsize
? bufsize
: default_bufsize
;
920 /* Try to double the size of '*buf', return true
921 * if successful, and '*sizep' will be updated with
922 * the new size. Otherwise, return false. */
924 enlarge_buffer(char **buf
, size_t *sizep
)
926 size_t newsize
= *sizep
* 2;
928 if (newsize
> *sizep
) {
929 *buf
= xrealloc(*buf
, newsize
);
937 /* Parse and sanity check user_spec.
939 * If successful, set global variables 'uid' and 'gid'
940 * with the parsed results. Global variable 'user'
941 * will be pointing to a string that stores the name
942 * of the user to be switched into.
944 * Also set 'switch_to_new_user' to true, The actual
945 * user switching is done as soon as daemonize_start()
946 * is called. I/O access before calling daemonize_start()
947 * will still be with root's credential. */
949 daemon_set_new_user(const char *user_spec
)
951 char *pos
= strchr(user_spec
, ':');
952 size_t init_bufsize
, bufsize
;
954 init_bufsize
= get_sysconf_buffer_size();
958 if (geteuid() || uid
) {
959 VLOG_FATAL("%s: only root can use --user option", pidfile
);
962 user_spec
+= strspn(user_spec
, " \t\r\n");
963 size_t len
= pos
? pos
- user_spec
: strlen(user_spec
);
965 struct passwd pwd
, *res
;
968 bufsize
= init_bufsize
;
969 buf
= xmalloc(bufsize
);
971 user
= xmemdup0(user_spec
, len
);
973 while ((e
= getpwnam_r(user
, &pwd
, buf
, bufsize
, &res
)) == ERANGE
) {
974 if (!enlarge_buffer(&buf
, &bufsize
)) {
980 VLOG_FATAL("%s: Failed to retrive user %s's uid (%s), aborting.",
981 pidfile
, user
, ovs_strerror(e
));
984 VLOG_FATAL("%s: user %s not found, aborting.", pidfile
, user
);
987 /* User name is not specified, use current user. */
988 while ((e
= getpwuid_r(uid
, &pwd
, buf
, bufsize
, &res
)) == ERANGE
) {
989 if (!enlarge_buffer(&buf
, &bufsize
)) {
995 VLOG_FATAL("%s: Failed to retrive current user's name "
996 "(%s), aborting.", pidfile
, ovs_strerror(e
));
998 user
= xstrdup(pwd
.pw_name
);
1006 char *grpstr
= pos
+ 1;
1007 grpstr
+= strspn(grpstr
, " \t\r\n");
1010 struct group grp
, *gres
;
1012 bufsize
= init_bufsize
;
1013 buf
= xmalloc(bufsize
);
1014 while ((e
= getgrnam_r(grpstr
, &grp
, buf
, bufsize
, &gres
))
1016 if (!enlarge_buffer(&buf
, &bufsize
)) {
1022 VLOG_FATAL("%s: Failed to get group entry for %s, "
1023 "(%s), aborting.", pidfile
, grpstr
,
1027 VLOG_FATAL("%s: group %s not found, aborting.", pidfile
,
1031 if (gid
!= grp
.gr_gid
) {
1034 for (mem
= grp
.gr_mem
; *mem
; ++mem
) {
1035 if (!strcmp(*mem
, user
)) {
1041 VLOG_FATAL("%s: Invalid --user option %s (user %s is "
1042 "not in group %s), aborting.", pidfile
,
1043 user_spec
, user
, grpstr
);