.\"
.\" Copyright (c) 1995 David Hovemeyer <daveho@infocom.com>
.\"
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY THE DEVELOPERS ``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 DEVELOPERS 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.
.\"
.\" %FreeBSD: src/lib/libc/sys/semctl.2,v 1.19 2004/07/02 23:52:13 ru Exp %
.\"
.\" $FreeBSD$
.Dd September 12, 1995
.Dt SEMCTL 2
.Os
.Sh ̾��
.Nm semctl
.Nd ���ޥե�������Ф����������椹��
.Sh �饤�֥��
.Lb libc
.Sh ��
.In sys/types.h
.In sys/ipc.h
.In sys/sem.h
.Ft int
.Fn semctl "int semid" "int semnum" "int cmd" ...
.Sh ����
.Fn semctl
�����ƥॳ����ϡ�
.Fa cmd
����������
.Fa semid
�Ǽ�����륻�ޥե�������Ф��Ƽ¹Ԥ��ޤ���
�����ͤ�
.Fa cmd
���Ф��Ƥϡ�4 ���ܤΰ���
.Fa "union semun arg"
��ɬ�פǤ���
.Fa arg
��������Ѥ��륳�ޥ�ɤξ�硢
.Fa "union semun"
�ϼ��Τ褦���������ޤ�:
.Bd -literal
.\"
.\" From <sys/sem.h>:
.\"
union semun {
        int     val;            /*  SETVAL �Ѥ��� */
        struct  semid_ds *buf;  /*  IPC_STAT ����� IPC_SET �ѤΥХåե� */
        u_short *array;         /*  GETALL ����� SETALL �Ѥ����� */
};
.Ed
.Pp
���ޥ�ɤϼ��Τ褦�˼¹Ԥ���ޤ�:
.\"
.\" This section based on Stevens, _Advanced Programming in the UNIX
.\" Environment_.
.\"
.Bl -tag -width IPC_RMIDXXX
.It Dv IPC_STAT
���ޥե������
.Fa "struct semid_ds"
���������
.Fa arg.buf
���ؤ��������¸���ޤ���
.It Dv IPC_SET
���ޥե������
.Fa "struct semid_ds"
����
.Fa sem_perm.uid ,
.Fa sem_perm.gid
�����
.Fa sem_perm.mode
��
.Fa arg.buf
���ؤ���¤�ΤΥ��ФȰ��פ���褦���ѹ����ޤ���
�ƤӽФ����ץ������μ¸��桼�� ID �ϡ�
.Fa sem_perm.uid
�ޤ���
.Fa sem_perm.cuid
�Τɤ��餫�Ȱ��פ���ɬ�פ����뤫��
�ޤ��ϥ����ѥ桼���ø�����äƤ���ɬ�פ�����ޤ���
.It IPC_RMID
���ޥե�����򤿤����˥����ƥफ�������ޤ���
�ƤӽФ����ץ������μ¸��桼�� ID �����ޥե������
.Fa sem_perm.uid
�ޤ���
.Fa sem_perm.cuid
�������������ޤ��ϥץ������������ѥ桼���ø�����äƤ���ɬ�פ�����ޤ���
.It Dv GETVAL
���ޥե��ֹ�
.Fa semnum
���ͤ��֤��ޤ���
.It Dv SETVAL
���ޥե��ֹ�
.Fa semnum
���ͤ�
.Fa arg.val
�����ꤷ�ޤ���
������ץ�������Ρ����Υ��ޥե����Ф���̤Ŭ�Ѥν�λ��Ĵ���ͤϡ�
�ä���ޤ���
.It Dv GETPID
���ޥե��ֹ�
.Fa semnum
�ˤĤ�������¹Ԥ����Ǹ�Υץ������Υץ����� ID ���֤��ޤ���
.It Dv GETNCNT
���ޥե��ֹ�
.Fa semnum
���ͤ����ߤ��ͤ���礭���ʤ�Τ��ԤäƤ���ץ������ο����֤��ޤ���
.It Dv GETZCNT
���ޥե��ֹ�
.Fa semnum
���ͤ� 0 �ˤʤ�Τ��ԤäƤ���ץ������ο����֤��ޤ���
.It Dv GETALL
������Τ��٤ƤΥ��ޥե����ͤ�
.Fa arg.array
���ؤ�������ؼ������ޤ���
.It Dv SETALL
������Τ��٤ƤΥ��ޥե����ͤ�
.Fa arg.array
���ؤ���������ͤ����ꤷ�ޤ���
������ץ�������Ρ����ν����°���뤹�٤ƤΥ��ޥե����Ф���̤Ŭ�Ѥ�
��λ��Ĵ���ͤϡ��ä���ޤ���
.El
.Pp
.Vt "struct semid_ds"
�ϼ��Τ褦���������ޤ�:
.Bd -literal
.\"
.\" Taken straight from <sys/sem.h>.
.\"
struct semid_ds {
        struct  ipc_perm sem_perm;      /* ���ѡ��ߥå����¤�� */
        struct  sem *sem_base;  /* ������κǽ�Υ��ޥե��ؤΥݥ��� */
        u_short sem_nsems;      /* ������Υ��ޥե��ο� */
        time_t  sem_otime;      /* �Ǹ�������� */
        long    sem_pad1;       /* SVABI/386 �ˤ��Ȥ��줬ɬ�� */
        time_t  sem_ctime;      /* �Ǹ���ѹ�����
                                 * 1970/01/01 00:00:00 GMT
                                 * �������ñ�̤ηв����
                                 */
        long    sem_pad2;       /* SVABI/386 �ˤ��Ȥ��줬ɬ�� */
        long    sem_pad3[4];    /* SVABI/386 �ˤ��Ȥ��줬ɬ�� */
};
.Ed
.Sh �����
����������˴�λ����ȡ�
.Fa cmd
��
.Dv GETVAL ,
.Dv GETPID ,
.Dv GETNCNT ,
.Dv GETZCNT
�Τɤ줫�Ǥ���Ȥ���
.Fn semctl
���б������ͤ��֤��ޤ���
�����Ǥʤ����� 0 ���֤��ޤ���
�����˼��Ԥ������ϡ�-1 ���֤������顼�򼨤������
.Va errno
�����ꤷ�ޤ���
.Sh ���顼
.Fn semctl
�����ƥॳ����ϼ��ξ��˽����˼��Ԥ��ޤ�:
.Bl -tag -width Er
.It Bq Er EINVAL
.Fa semid
���б����륻�ޥե����礬����ޤ���
.It Bq Er EINVAL
.Fa semnum
������������Υ��ޥե�������Ф���ͭ���ʥ��ޥե����ϰ���ˤ���ޤ���
.It Bq Er EPERM
�ƤӽФ����ץ������μ¸��桼�� ID ����
���ޥե�����ν�ͭ�Ԥޤ��Ϻ����ԤΥ桼�� ID �Ȱ��פ��ޤ���
.It Bq Er EACCES
���ȥ��ޥե�����Υ⡼�ɤδ֤��԰��פ����ä������
�ѡ��ߥå���󤬵��ݤ���ޤ�����
.It Bq Er ERANGE
.Dv SETVAL
�ޤ���
.Dv SETALL
�������ޥե���
.Bq 0 .. Dv SEMVMX
�ε����ϰϳ������ꤷ�褦�Ȥ��ޤ�����
.El
.Sh ��Ϣ����
.Xr semget 2 ,
.Xr semop 2
.Sh �Х�
.Dv SETALL
�ϡ����顼���֤����ˤ����Ĥ��Υ��ޥե����Ǥ򹹿����뤳�Ȥ�����ޤ���