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[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [sys/] [linux/] [mq_send.c] - Rev 258
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/* 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 1 #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; }
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