Originální popis anglicky:
sys/msg.h - XSI message queue structures
Návod, kniha: POSIX Programmer's Manual
#include <sys/msg.h>
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 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.
None.
None.
None.
<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
.
