1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
|
/*
* mq_receive.c - functions for receiving from message queue.
*/
#include <errno.h>
#include <stddef.h>
#include <sys/syscall.h>
#include <mqueue.h>
librt_hidden_proto(mq_timedreceive)
#ifdef __NR_mq_timedreceive
#define __NR___syscall_mq_timedreceive __NR_mq_timedreceive
static inline _syscall5(int, __syscall_mq_timedreceive, int, mqdes,
char *, msg_ptr, size_t, msg_len, unsigned int *, msg_prio,
const void *, abs_timeout);
#endif
/*
* Receive the oldest from highest priority messages.
* Stop waiting if abs_timeout expires.
*/
ssize_t mq_timedreceive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
unsigned int *msg_prio,
const struct timespec *abs_timeout)
{
#ifdef __NR_mq_timedreceive
return __syscall_mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, abs_timeout);
#else
errno = ENOSYS;
return -1;
#endif
}
librt_hidden_def(mq_timedreceive)
/* Receive the oldest from highest priority messages */
ssize_t mq_receive(mqd_t mqdes, char *msg_ptr, size_t msg_len,
unsigned int *msg_prio)
{
return mq_timedreceive(mqdes, msg_ptr, msg_len, msg_prio, NULL);
}
|
