0p:msg.h
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sys/msg.h - XSI message queue structures
#include <sys/msg.h>
Contents |
DESCRIPTION
The <sys/msg.h> header shall define the following data types through typedef:
msgqnum_t
Used for the number of messages in the message queue.
msglen_t
Used for the number of bytes allowed in a message queue.
These types shall be unsigned integer types that are able to store values at least as large as a type unsigned
short.
The <sys/msg.h> header shall define the following constant as a message operation flag:
MSG_NOERROR
No error if big message.
The msqid_ds structure shall contain the following members:
struct ipc_perm msg_perm Operation permission structure.
msgqnum_t msg_qnum Number of messages currently on queue.
msglen_t msg_qbytes Maximum number of bytes allowed on queue.
pid_t msg_lspid Process ID of last msgsnd
().
pid_t msg_lrpid Process ID of last msgrcv
().
time_t msg_stime Time of last msgsnd
().
time_t msg_rtime Time of last msgrcv
().
time_t msg_ctime Time of last change.
The pid_t, time_t, key_t, size_t, and ssize_t types shall be defined as described in <sys/types.h> .
The following shall be declared as functions and may also be defined as macros. Function prototypes shall be pro-
vided.
int msgctl(int, int, struct msqid_ds *);
int msgget(key_t, int);
ssize_t msgrcv(int, void *, size_t, long, int);
int msgsnd(int, const void *, size_t, int);
In addition, all of the symbols from <sys/ipc.h> shall be defined when this header is included.
The following sections are informative.
APPLICATION USAGE
None.
RATIONALE
None.
FUTURE DIRECTIONS
None.
RELATED
<sys/ipc.h> , <sys/types.h> , msgctl(), msgget(), msgrcv(), msgsnd()
COPYRIGHT
Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003 Edition, Stan-
dard for Information Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifica-
tions Issue 6, Copyright (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open
Group. In the event of any discrepancy between this version and the original IEEE and The Open Group Standard,
the original IEEE and The Open Group Standard is the referee document. The original Standard can be obtained
online at http://www.opengroup.org/unix/online.html .
IEEE/The Open Group 2003 <sys/msg.h>(P)