mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-28 23:34:53 +03:00
63 lines
2.0 KiB
C
63 lines
2.0 KiB
C
/* Copyright (C) 1995,1997,1998,1999,2000,2002 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 Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 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
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, see
|
|
<http://www.gnu.org/licenses/>. */
|
|
|
|
#include <errno.h>
|
|
#include <sys/shm.h>
|
|
#include <ipc_priv.h>
|
|
|
|
#include <sysdep.h>
|
|
#include <unistd.h>
|
|
#include <sys/syscall.h>
|
|
#include <bp-checks.h>
|
|
|
|
/* 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;
|
|
{
|
|
INTERNAL_SYSCALL_DECL(err);
|
|
unsigned long resultvar;
|
|
void *__unbounded raddr;
|
|
|
|
#if __BOUNDED_POINTERS__
|
|
size_t length = ~0;
|
|
struct shmid_ds shmds;
|
|
/* It's unfortunate that we need to make another system call to get
|
|
the shared memory segment length... */
|
|
if (shmctl (shmid, IPC_STAT, &shmds) == 0)
|
|
length = shmds.shm_segsz;
|
|
#endif
|
|
|
|
resultvar = INTERNAL_SYSCALL (ipc, err, 5, IPCOP_shmat,
|
|
shmid, shmflg,
|
|
(long int) __ptrvalue (&raddr),
|
|
__ptrvalue ((void *) shmaddr));
|
|
if (INTERNAL_SYSCALL_ERROR_P (resultvar, err))
|
|
{
|
|
__set_errno (INTERNAL_SYSCALL_ERRNO (resultvar, err));
|
|
return (void *) -1l;
|
|
}
|
|
|
|
return BOUNDED_N (raddr, length);
|
|
}
|