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63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* Copyright (C) 1995,1997,1998,1999,2000,2002 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 Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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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 <unistd.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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INTERNAL_SYSCALL_DECL(err);
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unsigned long resultvar;
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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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resultvar = INTERNAL_SYSCALL (ipc, err, 5, IPCOP_shmat,
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shmid, shmflg,
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(long int) __ptrvalue (&raddr),
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__ptrvalue ((void *) shmaddr));
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if (INTERNAL_SYSCALL_ERROR_P (resultvar, err))
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{
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__set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, err));
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return (void *) -1l;
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}
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return BOUNDED_N (raddr, length);
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}
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