98 lines
2.9 KiB
C
98 lines
2.9 KiB
C
/*
|
|
* 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
|