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* mq_open.c - open a message queue.
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#include <sys/syscall.h>
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#define __NR___syscall_mq_open __NR_mq_open
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static inline _syscall4(int, __syscall_mq_open, const char *, name,
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int, oflag, __kernel_mode_t, mode, void *, attr);
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* Establish connection between a process and a message queue and
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* return message queue descriptor or (mqd_t) -1 on error.
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* oflag determines the type of access used. If O_CREAT is on oflag, the
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* third argument is taken as a `mode_t', the mode of the created
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* message queue, and the fourth argument is taken as `struct mq_attr *',
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* pointer to message queue attributes.
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* If the fourth argument is NULL, default attributes are used.
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mqd_t mq_open(const char *name, int oflag, ...)
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if (oflag & O_CREAT) {
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mode = va_arg(ap, mode_t);
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attr = va_arg(ap, struct mq_attr *);
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return __syscall_mq_open(name + 1, oflag, mode, attr);