101 lines
2.8 KiB
C
101 lines
2.8 KiB
C
/* sys/msg.h
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Written by Conrad Scott <conrad.scott@dsl.pipex.com>
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#ifndef _CYGWIN_MSG_H
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#define _CYGWIN_MSG_H
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#include <cygwin/ipc.h>
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#ifdef __cplusplus
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extern "C"
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{
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#endif
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/* Message operation flags:
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*/
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#define MSG_NOERROR 0x01 /* No error if big message. */
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#ifdef _KERNEL
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/* Command definitions for the semctl () function:
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*/
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#define MSG_STAT 0x2000 /* For ipcs(8) */
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#define MSG_INFO 0x2001 /* For ipcs(8) */
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#endif /* _KERNEL */
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/* Used for the number of messages in the message queue.
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*/
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typedef uint32_t msgqnum_t;
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/* Used for the number of bytes allowed in a message queue.
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*/
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typedef uint32_t msglen_t;
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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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msglen_t msg_cbytes; /* Number of bytes currently on queue. */
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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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timestruc_t msg_stim; /* Time of last msgsnd (). */
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timestruc_t msg_rtim; /* Time of last msgrcv (). */
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timestruc_t msg_ctim; /* Time of last change. */
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#ifdef _KERNEL
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struct msg *msg_first;
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struct msg *msg_last;
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#else
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long msg_spare4[2];
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#endif /* _KERNEL */
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};
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#define msg_stime msg_stim.tv_sec
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#define msg_rtime msg_rtim.tv_sec
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#define msg_ctime msg_ctim.tv_sec
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#ifdef _KERNEL
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/* Buffer type for msgctl (IPC_INFO, ...) as used by ipcs(8).
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*/
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struct msginfo
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{
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int32_t msgmax; /* Maximum number of bytes per
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message. */
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int32_t msgmnb; /* Maximum number of bytes on any one
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message queue. */
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int32_t msgmni; /* Maximum number of message queues,
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system wide. */
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int32_t msgtql; /* Maximum number of messages, system
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wide. */
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int32_t msgssz; /* Size of a message segment, must be
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small power of 2 greater than 4. */
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int32_t msgseg; /* Number of message segments */
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int32_t msg_spare[2];
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};
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/* Buffer type for msgctl (MSG_INFO, ...) as used by ipcs(8).
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*/
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struct msg_info
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{
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int32_t msg_ids; /* Number of allocated queues. */
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int32_t msg_num; /* Number of messages, system wide. */
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int32_t msg_tot; /* Size in bytes of messages, system wide. */
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};
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#endif /* _KERNEL */
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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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#ifdef __cplusplus
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}
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#endif
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#endif /* _CYGWIN_MSG_H */
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