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- /*
- * mq_open.c - open a message queue.
- */
- #include <errno.h>
- #include <stdarg.h>
- #include <stddef.h>
- #include <sys/syscall.h>
- #include <mqueue.h>
- #ifdef __NR_mq_open
- #define __NR___syscall_mq_open __NR_mq_open
- static __inline__ _syscall4(int, __syscall_mq_open, const char *, name,
- int, oflag, __kernel_mode_t, mode, void *, attr);
- /*
- * Establish connection between a process and a message queue 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.
- */
- mqd_t mq_open(const char *name, int oflag, ...)
- {
- mode_t mode;
- struct mq_attr *attr;
- if (name[0] != '/') {
- __set_errno(EINVAL);
- return -1;
- }
- mode = 0;
- attr = NULL;
- if (oflag & O_CREAT) {
- va_list ap;
- va_start(ap, oflag);
- mode = va_arg(ap, mode_t);
- attr = va_arg(ap, struct mq_attr *);
- va_end(ap);
- }
- return __syscall_mq_open(name + 1, oflag, mode, attr);
- }
- #endif
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