sys/msg.h - XSI message queue structures
The <sys/msg.h> header shall define the following data types through
Used for the number of messages in the message queue.
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
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 provided.
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.
<sys/ipc.h> , <sys/types.h> , msgctl(), msgget(), msgrcv(), msgsnd()
Portions of this text are reprinted and reproduced in electronic form
from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
-- Portable Operating System Interface (POSIX), The Open Group Base
Specifications 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 .