msgget man page on FreeBSD

Man page or keyword search:  
man Server   9747 pages
apropos Keyword Search (all sections)
Output format
FreeBSD logo
[printable version]

MSGGET(2)		    BSD System Calls Manual		     MSGGET(2)

NAME
     msgget — get message queue

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <sys/types.h>
     #include <sys/ipc.h>
     #include <sys/msg.h>

     int
     msgget(key_t key, int msgflg);

DESCRIPTION
     The msgget() function returns the message queue identifier associated
     with key.	A message queue identifier is a unique integer greater than
     zero.

     A message queue is created if either key is equal to IPC_PRIVATE, or key
     does not have a message queue identifier associated with it, and the
     IPC_CREAT bit is set in msgflg.

     If a new message queue is created, the data structure associated with it
     (the msqid_ds structure, see msgctl(2)) is initialized as follows:

     ·	 msg_perm.cuid and msg_perm.uid are set to the effective uid of the
	 calling process.

     ·	 msg_perm.gid and msg_perm.cgid are set to the effective gid of the
	 calling process.

     ·	 msg_perm.mode is set to the lower 9 bits of msgflg.

     ·	 msg_cbytes, msg_qnum, msg_lspid, msg_lrpid, msg_rtime, and msg_stime
	 are set to 0.

     ·	 msg_qbytes is set to the system wide maximum value for the number of
	 bytes in a queue (MSGMNB).

     ·	 msg_ctime is set to the current time.

RETURN VALUES
     Upon successful completion a positive message queue identifier is
     returned.	Otherwise, -1 is returned and the global variable errno is set
     to indicate the error.

ERRORS
     [EACCES]		A message queue is already associated with key and the
			caller has no permission to access it.

     [EEXIST]		Both IPC_CREAT and IPC_EXCL are set in msgflg, and a
			message queue is already associated with key.

     [ENOSPC]		A new message queue could not be created because the
			system limit for the number of message queues has been
			reached.

     [ENOENT]		IPC_CREAT was not set in msgflg and no message queue
			associated with key was found.

SEE ALSO
     msgctl(2), msgrcv(2), msgsnd(2)

HISTORY
     Message queues appeared in the first release of AT&T System V UNIX.

BSD				 July 9, 2009				   BSD
[top]

List of man pages available for FreeBSD

Copyright (c) for man pages and the logo by the respective OS vendor.

For those who want to learn more, the polarhome community provides shell access and support.

[legal] [privacy] [GNU] [policy] [cookies] [netiquette] [sponsors] [FAQ]
Tweet
Polarhome, production since 1999.
Member of Polarhome portal.
Based on Fawad Halim's script.
...................................................................
Vote for polarhome
Free Shell Accounts :: the biggest list on the net