| MSGGET(2) | System Calls Manual | MSGGET(2) | 
msgget —
#include <sys/msg.h>
int
  
  msgget(key_t
    key, int
  msgflg);
msgget() system call 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 both the IPC_CREAT
    bit and the IPC_EXCL bit are set in
    msgflg, and key has a message
    queue identifier associated with it already, the operation will fail.
If a new message queue is created, the data structure associated with it (the msqid_ds structure, see msgctl(2)) is initialized as follows:
MSGMNB).EACCES]EEXIST]IPC_CREAT and
      IPC_EXCL are set in msgflg,
      and a message queue is already associated with
    key.ENOSPC]ENOENT]IPC_CREAT
      is not set in msgflg and no message queue associated
      with key was found.msgget system call conforms to
  X/Open System Interfaces and Headers Issue 5
  (“XSH5”).
| May 13, 2004 | NetBSD 9.3 |