43 lines
1.1 KiB
C
43 lines
1.1 KiB
C
#ifndef _SYS_MSG_H
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#define _SYS_MSG_H 1
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// https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/sys_msg.h.html
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#include <sys/cdefs.h>
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__BEGIN_DECLS
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#define __need_pid_t
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#define __need_size_t
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#define __need_ssize_t
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#define __need_time_t
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#include <sys/types.h>
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#include <sys/ipc.h>
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typedef unsigned int msgqnum_t;
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typedef unsigned int msglen_t;
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#define MSG_NOERROR 0
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struct msqid_ds
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{
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struct ipc_perm msg_perm; /* Operation permission structure. */
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msgqnum_t msg_qnum; /* Number of messages currently on queue. */
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msglen_t msg_qbytes; /* Maximum number of bytes allowed on queue. */
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pid_t msg_lspid; /* Process ID of last msgsnd(). */
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pid_t msg_lrpid; /* Process ID of last msgrcv(). */
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time_t msg_stime; /* Time of last msgsnd(). */
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time_t msg_rtime; /* Time of last msgrcv(). */
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time_t msg_ctime; /* Time of last change. */
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};
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int msgctl(int msqid, int cmd, struct msqid_ds* buf);
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int msgget(key_t key, int msgflg);
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ssize_t msgrcv(int msqid, void* msgp, size_t msgsz, long msgtyp, int msgflg);
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int msgsnd(int msqid, const void* msgp, size_t msgsz, int msgflg);
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__END_DECLS
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#endif
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