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When pidptr was passed as NULL to pidfile_open(3), we were returning

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EAGAIN/EWOULDBLOCK when another daemon was running and had the pidfile open.
We should return EEXIST in that case, fix it.

Reported by:	Dirk Engling <erdgeist@erdgeist.org>
Reviewed by:	jhb, Dirk Engling <erdgeist@erdgeist.org>
MFC after:	1 week
This commit is contained in:
Pawel Jakub Dawidek 2013-03-14 20:22:52 +00:00
parent e8a4a618cf
commit 36a00a3f38
1 changed files with 18 additions and 13 deletions
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31
lib/libutil/pidfile.c
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@ -126,20 +126,25 @@ pidfile_open(const char *path, mode_t mode, pid_t *pidptr)
fd = flopen(pfh->pf_path,
O_WRONLY | O_CREAT | O_TRUNC | O_CLOEXEC | O_NONBLOCK, mode);
if (fd == -1) {
if (errno == EWOULDBLOCK && pidptr != NULL) {
count = 20;
rqtp.tv_sec = 0;
rqtp.tv_nsec = 5000000;
for (;;) {
errno = pidfile_read(pfh->pf_path, pidptr);
if (errno != EAGAIN || --count == 0)
break;
nanosleep(&rqtp, 0);
}
if (errno == EAGAIN)
*pidptr = -1;
if (errno == 0 || errno == EAGAIN)
if (errno == EWOULDBLOCK) {
if (pidptr == NULL) {
errno = EEXIST;
} else {
count = 20;
rqtp.tv_sec = 0;
rqtp.tv_nsec = 5000000;
for (;;) {
errno = pidfile_read(pfh->pf_path,
pidptr);
if (errno != EAGAIN || --count == 0)
break;
nanosleep(&rqtp, 0);
}
if (errno == EAGAIN)
*pidptr = -1;
if (errno == 0 || errno == EAGAIN)
errno = EEXIST;
}
}
free(pfh);
return (NULL);