msgget man page on HP-UX

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msgget(2)							     msgget(2)

       msgget - get message queue

       returns the message queue identifier associated with key.

       A message queue identifier and associated message queue and data struc‐
       ture are created for key if one of the following is true:

	      key is equal to This call creates a new identifier,  subject  to
	      available	 resources.   The identifier will never be returned by
	      another call to until it has been released  by  a	 call  to  The
	      identifier  should  be  used  among  the calling process and its
	      descendents; however, it is not a requirement.  The resource can
	      be accessed by any process having the proper permissions.

	      key  does not already have a message queue identifier associated
	      with it, and (msgflg is "true".

	      On creation of a new queue, queue sizes above 64Kbytes can  only
	      be  constructed  when  the application is compiled with the flag
	      defined either explicitly with a in the source or with  at  com‐
	      pile time.

	      WARNING:	Programs compiled on HP-UX revisions prior to 11i Ver‐
	      sion 1 use old 16-bit structure fields (obtained via of the sys‐
	      tem  call)  which	 can describe queue sizes only up to 64KBytes.
	      Care must be taken such that queues shared  with	such  programs
	      are  not	made larger than 64KBytes (i.e., that is not specified
	      when compiling the caller of Or, those existing programs	should
	      be recompiled.  Or, the system administrator should restrict the
	      kernel tunable parameter to 64KBytes or less.

       Upon creation, the data structure associated with the new message queue
       identifier is initialized as follows:

	      and  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

	      and are set equal to 0.

	      is set equal to the current time.

	      is set equal to the system limit.

   Security Restrictions
       Some or all of the actions associated with this system call are subject
       to compartmental restrictions.  See compartments(5) for	more  informa‐
       tion about compartmentalization on systems that support that feature.

       Compartmental  restrictions  can be overridden if the process possesses
       the privilege (PRIV_COMMALLOWED).  Processes owned by the superuser may
       not  have  this	privilege.   Processes owned by any user may have this
       privilege, depending on system configuration.

       See privileges(5) for more information about privileged access on  sys‐
       tems that support fine-grained privileges.

       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.

       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 msgflg would not be granted.

       A message queue identifier does not exist for
		      key and (msgflg is "false".

       A message queue identifier is to	 be  created  but  the	system-imposed
		      on  the  maximum number of allowed message queue identi‐
		      fiers system wide would be exceeded.

       A message queue identifier exists for
		      key but ((msgflg & && (msgflg & is "true".

       ipcrm(1), ipcs(1), msgctl(2), msgop(2), stdipc(3C), privileges(5).


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