newlib-cygwin/newlib/libc/sys/linux/mq_close.c

49 lines
638 B
C

/* Copyright 2002, Red Hat Inc. */
#include <mqueue.h>
#include <errno.h>
#include <sys/sem.h>
#define _LIBC 1
#include <sys/lock.h>
#undef _LIBC
#include "mqlocal.h"
int
mq_close (mqd_t msgid)
{
struct libc_mq *info;
struct sembuf sb0 = {0, -1, 0};
int rc;
int semid;
info = __find_mq (msgid);
if (info == NULL)
{
errno = EBADF;
return -1;
}
/* lock message queue */
semid = info->semid;
rc = semop (semid, &sb0, 1);
if (rc == 0)
{
__cleanup_mq (msgid);
/* unlock message queue */
sb0.sem_op = 1;
semop (semid, &sb0, 1);
}
return rc;
}