.\"	%NetBSD: msgctl.2,v 1.1 1995/10/16 23:49:15 jtc Exp %	
.\"
.\" Copyright (c) 1995 Frank van der Linden
.\" All rights reserved.
.\"
.\" Redistribution and use in source and binary forms, with or without
.\" modification, are permitted provided that the following conditions
.\" are met:
.\" 1. Redistributions of source code must retain the above copyright
.\"    notice, this list of conditions and the following disclaimer.
.\" 2. Redistributions in binary form must reproduce the above copyright
.\"    notice, this list of conditions and the following disclaimer in the
.\"    documentation and/or other materials provided with the distribution.
.\" 3. All advertising materials mentioning features or use of this software
.\"    must display the following acknowledgement:
.\"      This product includes software developed for the NetBSD Project
.\"      by Frank van der Linden
.\" 4. The name of the author may not be used to endorse or promote products
.\"    derived from this software without specific prior written permission
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
.\" IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
.\" OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
.\" IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
.\" INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
.\" DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
.\" THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
.\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
.\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
.\"
.\"	%Id: msgctl.3,v 1.5 1997/11/23 17:58:36 bde Exp %
.\"/
.Dd November 24, 1997
.Dt MSGCTL 3
.Os FreeBSD
.Sh ̾��
.Nm msgctl
.Nd ��å��������楪�ڥ졼�����
.Sh ��
.Fd #include <sys/types.h>
.Fd #include <sys/ipc.h>
.Fd #include <sys/msg.h>
.Ft int
.Fn msgctl "int msqid" "int cmd" "struct msqid_ds *buf"
.Sh ����
.Fn msgctl
�����ƥॳ����ϡ�
.Fa msqid
�����ꤹ���å��������塼���Ф������楪�ڥ졼������¹Ԥ��ޤ���

�ƥ�å��������塼�ˤϡ�����˴�Ϣ�����ǡ�����¤�Τ�����ޤ���
�������
.Fn msgctl
���ѹ��Ǥ��ޤ���
.Fn msgctl
�Υ������������ǡ�����¤�⤢��ޤ������Υǡ�����¤�Τ�
.Aq Pa sys/msg.h
��������졢�ʲ��Τ褦�ʥ��Ф��ޤޤ�Ƥ��ޤ� (����¾�Υ��Ф�
����ޤ�)��
.Bd -literal
struct msqid_ds {
        struct  ipc_perm msg_perm; /* ��å��������塼�Υѡ��ߥå����ӥå� */
        struct  msg *msg_first; /* ���塼�κǽ�Υ�å����� */
        struct  msg *msg_last; /* ���塼�κǸ�Υ�å����� */
        u_long  msg_cbytes; /* ���塼�ǻ��Ѥ��Ƥ���Х��ȿ� */
        u_long  msg_qnum; /* ���塼�ǻ��Ѥ��Ƥ����å������� */
        u_long  msg_qbytes; /* ���塼�ǻ��Ѥ������Х��ȿ� */
        pid_t   msg_lspid; /* �Ǹ�� msgsnd �Υץ�����ID  */
        pid_t   msg_lrpid; /* �Ǹ�� msgrcv �Υץ�����ID  */
        time_t  msg_stime; /* �Ǹ�� msgsnd �λ���  */
        long    msg_pad1;
        time_t  msg_rtime; /* �Ǹ�� msgrcv �λ���  */
        long    msg_pad2;
        time_t  msg_ctime; /* �Ǹ�� msgctl �λ���  */
        long    msg_pad3;
        long    msg_pad4[4];
    };
.Ed
.Pp
.Bf -literal
shmid_ds
.Ef
��¤�Τ���ǻ��Ѥ����
.Bf -literal
ipc_perm
.Ef
��¤�Τϡ�
.Aq Pa sys/ipc.h
�ǰʲ��Τ褦���������Ƥ��ޤ���
.Bd -literal
struct ipc_perm {
        ushort  cuid;   /* �����ԤΥ桼��ID */
        ushort  cgid;   /* �����ԤΥ��롼��ID */
        ushort  uid;    /* �桼��ID */
        ushort  gid;    /* ���롼��ID */
        ushort  mode;   /* r/w �ѡ��ߥå���� */
        ushort  seq;    /* ���������ֹ� (��դ��������줿 msg/sem/shm ID) */
        key_t   key;    /* �桼�������ꤷ�� msg/sem/shm ���� */
};
.Ed
.Pp
.Fn msgctl
���¹Ԥ��륪�ڥ졼�����ϡ��ʲ��Τ����� 1 �Ĥ�
.Fa cmd
�ǻ��ꤵ��ޤ���
.Bl -tag -width IPC_RMIDX
.It Dv IPC_STAT
��å��������塼�ξ���򽸤ᡢ
.Fa buf
���ؤ���¤�Τ����֤��ޤ���
.It Dv IPC_SET
.Fa msqid
�˴�Ϣ���빽¤�Τ�
.Va msg_perm.uid
�ե�����ɡ�
.Va msg_perm.gid
�ե�����ɡ�
.Va msg_perm.mode
�ե�����ɡ�
.Va msg_qbytes
�ե�����ɤ��ͤ����ꤷ�ޤ��������ͤϡ�
.Fa buf
���ؤ���¤�Τ��б�����ե�����ɤ������ޤ������Υ��ڥ졼������
�¹ԤǤ���Τϡ������ѥ桼�����ޤ��ϥ�å��������塼�˴�Ϣ����
�ǡ�����¤�Τ�
.Va msg_perm.cuid
��
.Va msg_perm.uid
���������¸��桼�� ID ����ĥץ������ΤߤǤ���
.Va msg_qbytes
���ͤ����䤻��Τϡ������ѥ桼���ΤߤǤ��������ƥ�����
(
.Aq Pa sys/msg.h
�� MSGMNB) ��ۤ���
.Va msg_qbytes
���ͤϡ��������¤��ڤ�ΤƤ��ޤ���
.It Dv IPC_RMID
.Fa msqid
�����ꤹ���å��������塼��������
.Fa msqid
�˴�Ϣ����
�ǡ������˲����ޤ��������ѥ桼�����ޤ��ϡ����塼��
��Ϣ����ǡ�����¤�Τ�
.Va msg_perm.cuid
�ޤ���
.Va msg_perm.uid
���ͤ����¸��桼�� ID ���������ץ������Τߤ��������¹ԤǤ��ޤ���
.El

��å��������塼������ɹ��߸�����å��������塼�ؤν���߸� (
.Xr msgsnd 3
��
.Xr msgrcv 3
����) �ϡ��ե������Ʊ���褦�� (
.Xr chmod 2
����)��
.Va msg_perm.mode
�ե�����ɤˤ�äƷ�ޤ�ޤ����¸��桼�� ID �ϡ�
.Va msg_perm.cuid
�ե�����ɤ�
.Va msg_perm.uid
�ե�����ɤȰ��פ����¸����롼�� ID �ϡ�
.Va msg_perm.cgid
��
.Va msg_perm.gid
�Ȱ��פ��ޤ���
.Sh �����
����ʤ���λ����� 0 ���ᤵ��ޤ�������ʤ���λ���ʤ��� -1 ���ᤵ�졢
�������Х��ѿ�
.Va errno
�����Υ��顼�򼨤��褦�����ꤵ��ޤ���
.Sh ���顼
.Fn msgctl
�ϡ��ʲ��Τ褦�ʾ��˥��顼�Ȥʤ�ޤ���
.Bl -tag -width Er
.It Bq Er EPERM
.Fa cmd
�� IPC_SET �� IPC_RMID �����������ƽФ�¦�������ѥ桼���ǤϤʤ���硣
�ޤ��ϼ¸��桼�� ID ����å��������塼�˴�Ϣ����ǡ�����¤��
.Va msg_perm.uid
�ե�����ɤ�
.Va msg_perm.cuid
�ե�����ɤȰ��פ��ʤ���硣

IPC_SET ���Ѥ���
.Va msg_qbytes
���ͤ�夲�褦�Ȥ��������ƽФ�¦�������ѥ桼���Ǥʤ���硣
.It Bq Er EACCES
���ޥ�ɤ� IPC_STAT �Ǥ��뤬�����Υ�å��������塼��
�ɹ��߸����ƽФ�¦�ˤʤ���硣
.It Bq Er EINVAL
.Fa msqid
����������å��������塼 ID �Ǥʤ���硣

.Va cmd
�����������ޥ�ɤǤʤ���硣
.It Bq Er EFAULT
.Fa buf
�����������ɥ쥹����ꤷ�Ƥ��ʤ���硣
.El
.Sh ��Ϣ����
.Xr msgget 3 ,
.Xr msgrcv 3 ,
.Xr msgsnd 3
.Sh ���
��å��������塼�ϡ�
AT&T Unix System V
�κǽ�Υ�꡼�����ɲä���ޤ�����
.\"kuma 1999-11-12