73 lines
1.3 KiB
C
73 lines
1.3 KiB
C
/* Copyright 2002, Red Hat Inc. */
|
|
|
|
#include <mqueue.h>
|
|
#include <fcntl.h>
|
|
#include <errno.h>
|
|
#include <sys/ipc.h>
|
|
#include <sys/sem.h>
|
|
#include <string.h>
|
|
#include <stdlib.h>
|
|
#define _LIBC
|
|
#include <sys/lock.h>
|
|
#undef _LIBC
|
|
|
|
#include "mqlocal.h"
|
|
|
|
__LOCK_INIT(static, mq_wrbuf_lock);
|
|
|
|
int
|
|
mq_send (mqd_t msgid, const char *msg, size_t msg_len, unsigned int msg_prio)
|
|
{
|
|
struct libc_mq *info;
|
|
struct sembuf sb2 = {2, -1, 0};
|
|
struct sembuf sb3 = {3, 1, 0};
|
|
int rc;
|
|
int ipcflag;
|
|
|
|
info = __find_mq (msgid);
|
|
|
|
if (info == NULL || (info->oflag & O_ACCMODE) == O_RDONLY)
|
|
{
|
|
errno = EBADF;
|
|
return -1;
|
|
}
|
|
|
|
if (msg_len > info->attr->mq_msgsize)
|
|
{
|
|
errno = EMSGSIZE;
|
|
return -1;
|
|
}
|
|
|
|
if (msg_prio > MQ_PRIO_MAX)
|
|
{
|
|
errno = EINVAL;
|
|
return -1;
|
|
}
|
|
|
|
__lock_acquire (mq_wrbuf_lock);
|
|
|
|
memcpy (info->wrbuf->text, msg, msg_len);
|
|
info->wrbuf->type = (MQ_PRIO_MAX - msg_prio);
|
|
|
|
ipcflag = (info->attr->mq_flags & O_NONBLOCK) ? IPC_NOWAIT : 0;
|
|
sb2.sem_flg = ipcflag;
|
|
|
|
/* check to see if max msgs are on queue */
|
|
rc = semop (info->semid, &sb2, 1);
|
|
|
|
if (rc == 0)
|
|
rc = msgsnd (info->msgqid, info->wrbuf, msg_len, ipcflag);
|
|
|
|
if (rc == 0)
|
|
semop (info->semid, &sb3, 1); /* increment number of reads */
|
|
|
|
__lock_release (mq_wrbuf_lock);
|
|
return rc;
|
|
}
|
|
|
|
|
|
|
|
|
|
|
|
|