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Don't forget to use fourth argument if O_CREAT is set in argument oflag.

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The fourth specifies initial value for the semaphore.
This commit is contained in:
David Xu 2010-01-07 04:15:49 +00:00
parent e33b1a7e54
commit 323d80a0a7
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=201715
2 changed files with 5 additions and 3 deletions
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4
lib/libc/gen/sem_new.c
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@ -143,6 +143,7 @@ _sem_open(const char *name, int flags, ...)
struct sem_nameinfo *ni = NULL;
sem_t *sem = NULL;
int fd = -1, mode, len;
int value = 0;
if (name[0] != '/') {
errno = EINVAL;
@ -170,6 +171,7 @@ _sem_open(const char *name, int flags, ...)
if (flags & O_CREAT) {
va_start(ap, flags);
mode = va_arg(ap, int);
value = va_arg(ap, int);
va_end(ap);
}
@ -203,7 +205,7 @@ _sem_open(const char *name, int flags, ...)
tmp._magic = SEM_MAGIC;
tmp._kern._has_waiters = 0;
tmp._kern._count = 0;
tmp._kern._count = value;
tmp._kern._flags = USYNC_PROCESS_SHARED | SEM_NAMED;
if (_write(fd, &tmp, sizeof(tmp)) != sizeof(tmp)) {
flock(fd, LOCK_UN);

4
tools/regression/posixsem2/semtest.c
View File

@ -58,10 +58,10 @@ test_named(void)
printf("testing named process-shared semaphore\n");
sem_unlink(SEM_NAME);
s = sem_open(SEM_NAME, O_CREAT, 0777);
s = sem_open(SEM_NAME, O_CREAT, 0777, 0);
if (s == SEM_FAILED)
err(1, "sem_open failed");
s2 = sem_open(SEM_NAME, O_CREAT, 0777);
s2 = sem_open(SEM_NAME, O_CREAT, 0777, 0);
if (s2 == SEM_FAILED)
err(2, "second sem_open call failed");
if (s != s2)