58 lines
1.9 KiB
C
58 lines
1.9 KiB
C
/* Copyright (C) 1995, 1997, 1998, 1999, 2000 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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Contributed by Ulrich Drepper <drepper@gnu.ai.mit.edu>, August 1995.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <errno.h>
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#include <sys/shm.h>
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#include <ipc_priv.h>
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#include <sysdep.h>
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#include <sys/syscall.h>
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#include <bp-checks.h>
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/* Attach the shared memory segment associated with SHMID to the data
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segment of the calling process. SHMADDR and SHMFLG determine how
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and where the segment is attached. */
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void *
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shmat (shmid, shmaddr, shmflg)
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int shmid;
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const void *shmaddr;
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int shmflg;
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{
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void *__unbounded result;
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void *__unbounded raddr;
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#if __BOUNDED_POINTERS__
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size_t length = ~0;
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struct shmid_ds shmds;
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/* It's unfortunate that we need to make another system call to get
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the shared memory segment length... */
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if (shmctl (shmid, IPC_STAT, &shmds) == 0)
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length = shmds.shm_segsz;
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#endif
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result = (void *__unbounded) INLINE_SYSCALL (ipc, 5, IPCOP_shmat, shmid, shmflg,
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(long int) __ptrvalue (&raddr),
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__ptrvalue (shmaddr));
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if ((unsigned long) result <= -(unsigned long) SHMLBA)
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result = raddr;
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return BOUNDED_N (result, length);
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}
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