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OpenSolaris 2009.06 - man page for msgctl (opensolaris section 2)

msgctl(2)				   System Calls 				msgctl(2)

NAME
       msgctl - message control operations

SYNOPSIS
       #include <sys/msg.h>

       int msgctl(int msqid, int cmd, struct msqid_ds *buf);

DESCRIPTION
       The  msgctl()  function	provides  a variety of message control operations as specified by
       cmd. The following cmds are available:

       IPC_STAT    Place the current value of each member of the data structure  associated  with
		   msqid into the structure pointed to by buf. The contents of this structure are
		   defined in Intro(2).

       IPC_SET	   Set the value of the following members of the data structure  associated  with
		   msqid to the corresponding value found in the structure pointed to by buf:

		     msg_perm.uid
		     msg_perm.gid
		     msg_perm.mode /* access permission bits only */
		     msg_qbytes

		   This  command  can  be  executed  only  by  a  process  that  has  either  the
		   {PRIV_IPC_OWNER} privilege or an effective user  ID	equal  to  the	value  of
		   msg_perm.cuid  or  msg_perm.uid  in	the data structure associated with msqid.
		   Only a process with the {PRIV_SYS_IPC_CONFIG} privilege can raise the value of
		   msg_qbytes.

       IPC_RMID    Remove  the	message  queue	identifier specified by msqid from the system and
		   destroy the message queue and data structure associated with it. This cmd  can
		   only be executed by a process that has an effective user ID either with appro-
		   priate privileges asserted in the effective set  or	equal  to  the	value  of
		   msg_perm.cuid  or   msg_perm.uid  in the data structure associated with msqid.
		   The buf argument is ignored.

RETURN VALUES
       Upon successful completion, msgctl() returns 0. Otherwise, it returns -1 and sets errno to
       indicate the error.

ERRORS
       The msgctl() function will fail if:

       EACCES	    The  cmd argument is IPC_STAT and operation permission is denied to the call-
		    ing process (see Intro(2)).

       EFAULT	    The buf argument points to an illegal address.

       EINVAL	    The msqid argument is not a valid message queue identifier; or the cmd  argu-
		    ment is not a valid command or is IPC_SET and msg_perm.uid or msg_perm.gid is
		    not valid.

       EOVERFLOW    The cmd argument is IPC_STAT and uid or gid is too large to be stored in  the
		    structure pointed to by buf.

       EPERM	    The  cmd  argument is IPC_RMID or IPC_SET, the {PRIV_SYS_IPC_OWNER} privilege
		    is not asserted in the effective set of the calling process, and is not equal
		    to	the  value of msg_perm.cuid or msg_perm.uid in the data structure associ-
		    ated with msqid.

		    The cmd argument is IPC_SET, an attempt is being  made  to	increase  to  the
		    value  of msg_qbytes, and the {PRIV_SYS_IPC_CONFIG} privilege is not asserted
		    in the effective set of the calling process.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+

SEE ALSO
       Intro(2), msgget(2), msgrcv(2), msgsnd(2), attributes(5), privileges(5), standards(5)

SunOS 5.11				   22 Mar 2004					msgctl(2)


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