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Macros | |
- MSG_NOERROR
No error if big message
- MSG_WWAIT
A writer is waiting on the queue
- MSG_RWAIT
A reader is waiting on the queue
Functions | |
If __STDC__ is defined:
extern int msgget( key_t, int );
extern int msgctl( int, int, struct msqid_ds * );
extern int msgrcv( int, void *, int, long, int );
extern int msgsnd( int, void *, int, int );
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If __STDC__ is not defined:
extern int msgget( );
extern int msgctl( );
extern int msgrcv( );
extern int msgsnd( );
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Structures | |
Message queue control structure:
struct msqid_ds {
struct ipc_perm msg_perm; /* msg_perm defined in sys/ipc.h */
void *msg_first; /* not used on MPE/iX */
void *msg_last; /* not used on MPE/iX */
int msg_cbytes; /* current # bytes on queue */
int msg_qnum; /* # of messages on queue */
int msg_qbytes; /* max # of bytes on queue */
pid_t msg_lspid; /* pid of last msgsnd */
pid_t msg_lrpid; /* pid of last msgrcv */
time_t msg_stime; /* last msgsnd time */
time_t msg_rtime; /* last msgrcv time */
time_t msg_ctime; /* last change time */
};
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Message buffer template structure:
struct msgbuf { /*This is a sample template only */
long mtype; /* message type */
char mtext[1]; /* message text */
};
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