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
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
|
/*
* mqueue.h - definitions and function prototypes for POSIX mqueue support.
*/
#ifndef _MQUEUE_H
#define _MQUEUE_H
#include <features.h>
#include <sys/types.h>
#include <fcntl.h>
#define __need_sigevent_t
#include <bits/siginfo.h>
#define __need_timespec
#include <time.h>
typedef int mqd_t;
struct mq_attr {
long int mq_flags; /* Message queue flags */
long int mq_maxmsg; /* Maximum number of messages */
long int mq_msgsize; /* Maximum message size */
long int mq_curmsgs; /* Number of messages currently queued */
long int __pad[4];
};
__BEGIN_DECLS
/*
* Establish connection between a process and a message queue __name and
* return message queue descriptor or (mqd_t) -1 on error. __oflag determines
* the type of access used. If O_CREAT is on __oflag, the third argument is
* taken as a `mode_t', the mode of the created message queue, and the fourth
* argument is taken as `struct mq_attr *', pointer to message queue
* attributes. If the fourth argument is NULL, default attributes are used.
*/
extern mqd_t mq_open(const char *__name, int __oflag, ...) __THROW;
/*
* Remove the association between message queue descriptor __mqdes and its
* message queue.
*/
extern int mq_close(mqd_t __mqdes) __THROW;
/* Query status and attributes of message queue __mqdes */
extern int mq_getattr(mqd_t __mqdes, struct mq_attr *__mqstat) __THROW;
/*
* Set attributes associated with message queue __mqdes and if __omqstat is
* not NULL also query its old attributes.
*/
extern int mq_setattr(mqd_t __mqdes,
const struct mq_attr *__restrict __mqstat,
struct mq_attr *__restrict __omqstat) __THROW;
/* Remove message queue named __name */
extern int mq_unlink(const char *__name) __THROW;
/*
* Register notification upon message arrival to an empty message queue
* __mqdes
*/
extern int mq_notify(mqd_t __mqdes, const struct sigevent *__notification)
__THROW;
/*
* Receive the oldest from highest priority messages in message queue
* __mqdes
*/
extern ssize_t mq_receive(mqd_t __mqdes, char *__msg_ptr, size_t __msg_len,
unsigned int *__msg_prio);
/* Add message pointed by __msg_ptr to message queue __mqdes */
extern int mq_send(mqd_t __mqdes, const char *__msg_ptr, size_t __msg_len,
unsigned int __msg_prio);
#ifdef __USE_XOPEN2K
/*
* Receive the oldest from highest priority messages in message queue
* __mqdes, stop waiting if __abs_timeout expires.
*/
extern ssize_t mq_timedreceive(mqd_t __mqdes, char *__restrict __msg_ptr,
size_t __msg_len,
unsigned int *__restrict __msg_prio,
const struct timespec *__restrict __abs_timeout);
/*
* Add message pointed by __msg_ptr to message queue __mqdes, stop blocking
* on full message queue if __abs_timeout expires.
*/
extern int mq_timedsend(mqd_t __mqdes, const char *__msg_ptr,
size_t __msg_len, unsigned int __msg_prio,
const struct timespec *__abs_timeout);
#endif
__END_DECLS
#endif
|
