uclibc-ng/libc/misc/sysvipc/shm.c

/* Copyright (C) 1995, 1997, 1998 Free Software Foundation, Inc.
   This file is part of the GNU C Library.
   Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public License as
   published by the Free Software Foundation; either version 2 of the
   License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with the GNU C Library; see the file COPYING.LIB.  If not,
   write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
   Boston, MA 02111-1307, USA.  */

#include <stdlib.h>
#include <errno.h>
#include <sys/shm.h>
#include "ipc.h"

#ifdef L_shmat
/* Attach the shared memory segment associated with SHMID to the data
   segment of the calling process.  SHMADDR and SHMFLG determine how
   and where the segment is attached.  */

void *
shmat (shmid, shmaddr, shmflg)
    int shmid;
    const void *shmaddr;
    int shmflg;
{
    int retval;
    unsigned long raddr;

    retval = __ipc(IPCOP_shmat, shmid, shmflg, (int) &raddr, (void *) shmaddr);
    return ((unsigned long int) retval > -(unsigned long int) SHMLBA
	    ? (void *) retval : (void *) raddr);
}
#endif

#ifdef L_shmctl
/* Provide operations to control over shared memory segments.  */

int
shmctl (shmid, cmd, buf)
    int shmid;
    int cmd;
    struct shmid_ds *buf;
{
    return __ipc(IPCOP_shmctl, shmid, cmd, 0, buf);
}
#endif


#ifdef L_shmdt
/* Detach shared memory segment starting at address specified by SHMADDR
   from the caller's data segment.  */

int
shmdt (shmaddr)
    const void *shmaddr;
{
    return __ipc(IPCOP_shmdt, 0, 0, 0, (void *) shmaddr);
}
#endif

#ifdef L_shmget
/* Return an identifier for an shared memory segment of at least size SIZE
   which is associated with KEY.  */

int
shmget (key, size, shmflg)
    key_t key;
    size_t size;
    int shmflg;
{
    return __ipc(IPCOP_shmget, key, size, shmflg, NULL);
}
#endif