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138 lines
4.2 KiB
C
138 lines
4.2 KiB
C
/* Copyright (C) 1995, 1997, 1998, 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 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, write to the Free
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Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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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 <string.h>
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#include <sys/syscall.h>
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#include <bits/wordsize.h>
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#include <bp-checks.h>
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#include "kernel-features.h"
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struct __old_shmid_ds
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{
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struct __old_ipc_perm shm_perm; /* operation permission struct */
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int shm_segsz; /* size of segment in bytes */
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__time_t shm_atime; /* time of last shmat() */
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__time_t shm_dtime; /* time of last shmdt() */
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__time_t shm_ctime; /* time of last change by shmctl() */
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__ipc_pid_t shm_cpid; /* pid of creator */
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__ipc_pid_t shm_lpid; /* pid of last shmop */
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unsigned short int shm_nattch; /* number of current attaches */
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unsigned short int __shm_npages; /* size of segment (pages) */
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unsigned long int *__unbounded __shm_pages; /* array of ptrs to frames -> SHMMAX */
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struct vm_area_struct *__unbounded __attaches; /* descriptors for attaches */
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};
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struct __old_shminfo
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{
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int shmmax;
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int shmmin;
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int shmmni;
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int shmseg;
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int shmall;
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};
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extern int __syscall_shmctl (int, int, void *);
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/* Provide operations to control over shared memory segments. */
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int __new_shmctl (int, int, struct shmid_ds *);
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int
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__new_shmctl (int shmid, int cmd, struct shmid_ds *buf)
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{
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#if __ASSUME_32BITUIDS > 0
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return INLINE_SYSCALL (shmctl, 3, shmid, cmd | __IPC_64, CHECK_1 (buf));
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#else
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switch (cmd) {
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case SHM_STAT:
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case IPC_STAT:
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case IPC_SET:
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case IPC_INFO:
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break;
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default:
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return INLINE_SYSCALL (shmctl, 3, shmid, cmd, CHECK_1 (buf));
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}
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{
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int save_errno = errno, result;
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struct __old_shmid_ds old;
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/* Unfortunately there is no way how to find out for sure whether
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we should use old or new shmctl. */
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result = INLINE_SYSCALL (shmctl, 3, shmid, cmd | __IPC_64, CHECK_1 (buf));
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if (result != -1 || errno != EINVAL)
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return result;
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__set_errno(save_errno);
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if (cmd == IPC_SET)
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{
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old.shm_perm.uid = buf->shm_perm.uid;
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old.shm_perm.gid = buf->shm_perm.gid;
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old.shm_perm.mode = buf->shm_perm.mode;
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if (old.shm_perm.uid != buf->shm_perm.uid ||
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old.shm_perm.gid != buf->shm_perm.gid)
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{
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__set_errno (EINVAL);
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return -1;
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}
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}
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result = INLINE_SYSCALL (shmctl, 3, shmid, cmd, __ptrvalue (&old));
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if (result != -1 && (cmd == SHM_STAT || cmd == IPC_STAT))
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{
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memset(buf, 0, sizeof(*buf));
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buf->shm_perm.__key = old.shm_perm.__key;
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buf->shm_perm.uid = old.shm_perm.uid;
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buf->shm_perm.gid = old.shm_perm.gid;
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buf->shm_perm.cuid = old.shm_perm.cuid;
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buf->shm_perm.cgid = old.shm_perm.cgid;
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buf->shm_perm.mode = old.shm_perm.mode;
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buf->shm_perm.__seq = old.shm_perm.__seq;
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buf->shm_atime = old.shm_atime;
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buf->shm_dtime = old.shm_dtime;
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buf->shm_ctime = old.shm_ctime;
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buf->shm_segsz = old.shm_segsz;
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buf->shm_nattch = old.shm_nattch;
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buf->shm_cpid = old.shm_cpid;
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buf->shm_lpid = old.shm_lpid;
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}
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else if (result != -1 && cmd == IPC_INFO)
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{
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struct __old_shminfo *oldi = (struct __old_shminfo *)&old;
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struct shminfo *i = (struct shminfo *)buf;
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memset(i, 0, sizeof(*i));
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i->shmmax = oldi->shmmax;
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i->shmmin = oldi->shmmin;
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i->shmmni = oldi->shmmni;
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i->shmseg = oldi->shmseg;
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i->shmall = oldi->shmall;
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}
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return result;
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}
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#endif
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}
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#include <shlib-compat.h>
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versioned_symbol (libc, __new_shmctl, shmctl, GLIBC_2_2);
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