get message queue
cc ... -lc
int msgget (key, msgflg)
returns the message queue identifier associated with
A message queue identifier and associated message queue and data
structure are created for
if one of the following is true:
The key argument is equal to IPC_PRIVATE.
The key argument does not already have
a message queue identifier associated with it,
and (msgflg & IPC_CREAT) is ``true''.
Upon creation, the data structure associated with the new message queue
identifier is initialized as follows:
are set equal to the effective user ID
and effective group ID,
respectively, of the calling process.
The low-order 9 bits of
are set equal to the low-order 9 bits of msgflg.
msg_rtime are set equal to 0.
msg_ctime is set equal to the current time.
msg_qbytes is set equal to the system limit.
The msgget system call
fails if one or more of the following is true:
A message queue identifier exists for key, but
operation permission as specified by the low-order 9 bits of
would not be granted.
A message queue identifier exists for
A message queue identifier does not exist for key
and (msgflg & IPC_CREAT) is ``false''.
A message queue identifier is to be created but
the system-imposed limit on the maximum number of
allowed message queue identifiers system wide
would be exceeded.
Upon successful completion,
a non-negative integer,
namely a message queue identifier, is returned.
Otherwise, a value of -1 is returned, and
is set to indicate the error.
msgget is conformant with:
X/Open Portability Guide, Issue 3, 1989
© 2003 Caldera International, Inc. All rights reserved.
SCO OpenServer Release 5.0.7 -- 11 February 2003