131 lines
3.9 KiB
C
131 lines
3.9 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 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 <stdarg.h>
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#include <sys/sem.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 "kernel-features.h"
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struct __old_semid_ds
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{
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struct __old_ipc_perm sem_perm; /* operation permission struct */
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__time_t sem_otime; /* last semop() time */
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__time_t sem_ctime; /* last time changed by semctl() */
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struct sem *__sembase; /* ptr to first semaphore in array */
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struct sem_queue *__sem_pending; /* pending operations */
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struct sem_queue *__sem_pending_last; /* last pending operation */
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struct sem_undo *__undo; /* ondo requests on this array */
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unsigned short int sem_nsems; /* number of semaphores in set */
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};
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/* Define a `union semun' suitable for Linux here. */
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union semun
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{
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int val; /* value for SETVAL */
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struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */
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unsigned short int *array; /* array for GETALL & SETALL */
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struct seminfo *__buf; /* buffer for IPC_INFO */
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};
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extern int __syscall_semctl (int, int, int, void *);
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/* Return identifier for array of NSEMS semaphores associated with
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KEY. */
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int __new_semctl (int semid, int semnum, int cmd, ...);
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int
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__new_semctl (int semid, int semnum, int cmd, ...)
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{
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union semun arg;
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va_list ap;
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va_start (ap, cmd);
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/* Get the argument. */
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arg = va_arg (ap, union semun);
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va_end (ap);
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#if __ASSUME_32BITUIDS > 0
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return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64, &arg);
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#else
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switch (cmd) {
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case SEM_STAT:
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case IPC_STAT:
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case IPC_SET:
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break;
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default:
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return INLINE_SYSCALL (semctl, 4, semid, semnum, cmd, &arg);
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}
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{
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int save_errno = errno, result;
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struct __old_semid_ds old;
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struct semid_ds *buf;
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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 semctl. */
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result = INLINE_SYSCALL (semctl, 4, semid, semnum, cmd | __IPC_64, &arg);
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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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buf = arg.buf;
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arg.buf = (struct semid_ds *)&old;
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if (cmd == IPC_SET)
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{
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old.sem_perm.uid = buf->sem_perm.uid;
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old.sem_perm.gid = buf->sem_perm.gid;
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old.sem_perm.mode = buf->sem_perm.mode;
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if (old.sem_perm.uid != buf->sem_perm.uid ||
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old.sem_perm.gid != buf->sem_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 (semctl, 4, semid, semnum, cmd, &arg);
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if (result != -1 && cmd != IPC_SET)
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{
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memset(buf, 0, sizeof(*buf));
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buf->sem_perm.__key = old.sem_perm.__key;
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buf->sem_perm.uid = old.sem_perm.uid;
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buf->sem_perm.gid = old.sem_perm.gid;
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buf->sem_perm.cuid = old.sem_perm.cuid;
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buf->sem_perm.cgid = old.sem_perm.cgid;
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buf->sem_perm.mode = old.sem_perm.mode;
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buf->sem_perm.__seq = old.sem_perm.__seq;
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buf->sem_otime = old.sem_otime;
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buf->sem_ctime = old.sem_ctime;
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buf->sem_nsems = old.sem_nsems;
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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_semctl, semctl, GLIBC_2_2);
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