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/* Copyright (C) 1995, 1997, 1998, 2000 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. */
#define __LIBC_IPC_INTERNAL
#include <errno.h>
#include <sys/shm.h>
#include <sysdep.h>
#include <string.h>
#include <sys/syscall.h>
#include <bits/wordsize.h>
#include "kernel-features.h"
/* Provide operations to control over shared memory segments. */
int __old_shmctl (int, int, struct __old_shmid_ds *);
int __new_shmctl (int, int, struct shmid_ds *);
int
__old_shmctl (int shmid, int cmd, struct __old_shmid_ds *buf)
{
return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf);
}
int
__new_shmctl (int shmid, int cmd, struct shmid_ds *buf)
{
#if __ASSUME_32BITUIDS > 0
return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0, buf);
#else
switch (cmd) {
case SHM_STAT:
case IPC_STAT:
case IPC_SET:
#if __WORDSIZE != 32
case IPC_INFO:
#endif
break;
default:
return INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, buf);
}
{
int save_errno = errno, result;
struct __old_shmid_ds old;
/* Unfortunately there is no way how to find out for sure whether
we should use old or new shmctl. */
result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd | __IPC_64, 0, buf);
if (result != -1 || errno != EINVAL)
return result;
__set_errno(save_errno);
if (cmd == IPC_SET)
{
old.shm_perm.uid = buf->shm_perm.uid;
old.shm_perm.gid = buf->shm_perm.gid;
old.shm_perm.mode = buf->shm_perm.mode;
if (old.shm_perm.uid != buf->shm_perm.uid ||
old.shm_perm.gid != buf->shm_perm.gid)
{
__set_errno (EINVAL);
return -1;
}
}
result = INLINE_SYSCALL (ipc, 5, IPCOP_shmctl, shmid, cmd, 0, &old);
if (result != -1 && (cmd == SHM_STAT || cmd == IPC_STAT))
{
memset(buf, 0, sizeof(*buf));
buf->shm_perm.__key = old.shm_perm.__key;
buf->shm_perm.uid = old.shm_perm.uid;
buf->shm_perm.gid = old.shm_perm.gid;
buf->shm_perm.cuid = old.shm_perm.cuid;
buf->shm_perm.cgid = old.shm_perm.cgid;
buf->shm_perm.mode = old.shm_perm.mode;
buf->shm_perm.__seq = old.shm_perm.__seq;
buf->shm_atime = old.shm_atime;
buf->shm_dtime = old.shm_dtime;
buf->shm_ctime = old.shm_ctime;
buf->shm_segsz = old.shm_segsz;
buf->shm_nattch = old.shm_nattch;
buf->shm_cpid = old.shm_cpid;
buf->shm_lpid = old.shm_lpid;
}
#if __WORDSIZE != 32
else if (result != -1 && cmd == IPC_INFO)
{
struct __old_shminfo *oldi = (struct __old_shminfo *)&old;
struct shminfo *i = (struct shminfo *)buf;
memset(i, 0, sizeof(*i));
i->shmmax = oldi->shmmax;
i->shmmin = oldi->shmmin;
i->shmmni = oldi->shmmni;
i->shmseg = oldi->shmseg;
i->shmall = oldi->shmall;
}
#endif
return result;
}
#endif
}
#if defined PIC && DO_VERSIONING
default_symbol_version (__new_shmctl, shmctl, GLIBC_2.2);
symbol_version (__old_shmctl, shmctl, GLIBC_2.0);
#else
weak_alias (__new_shmctl, shmctl);
#endif
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