diff options
Diffstat (limited to 'sysdeps/unix/sysv/linux/i386/semctl.c')
| -rw-r--r-- | sysdeps/unix/sysv/linux/i386/semctl.c | 173 |
1 files changed, 173 insertions, 0 deletions
diff --git a/sysdeps/unix/sysv/linux/i386/semctl.c b/sysdeps/unix/sysv/linux/i386/semctl.c new file mode 100644 index 0000000000..7704d2387b --- /dev/null +++ b/sysdeps/unix/sysv/linux/i386/semctl.c @@ -0,0 +1,173 @@ +/* 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. */ + +#include <errno.h> +#include <stdarg.h> +#include <sys/sem.h> +#include <ipc_priv.h> + +#include <sysdep.h> +#include <string.h> +#include <sys/syscall.h> + +#include "kernel-features.h" + +struct __old_semid_ds +{ + struct __old_ipc_perm sem_perm; /* operation permission struct */ + __time_t sem_otime; /* last semop() time */ + __time_t sem_ctime; /* last time changed by semctl() */ + struct sem *__sembase; /* ptr to first semaphore in array */ + struct sem_queue *__sem_pending; /* pending operations */ + struct sem_queue *__sem_pending_last; /* last pending operation */ + struct sem_undo *__undo; /* ondo requests on this array */ + unsigned short int sem_nsems; /* number of semaphores in set */ +}; + +/* Define a `union semun' suitable for Linux here. */ +union semun +{ + int val; /* value for SETVAL */ + struct semid_ds *buf; /* buffer for IPC_STAT & IPC_SET */ + unsigned short int *array; /* array for GETALL & SETALL */ + struct seminfo *__buf; /* buffer for IPC_INFO */ +}; + +#ifdef __NR_getuid32 +# if __ASSUME_32BITUIDS == 0 +/* This variable is shared with all files that need to check for 32bit + uids. */ +extern int __libc_missing_32bit_uids; +# endif +#endif + +/* Return identifier for array of NSEMS semaphores associated with + KEY. */ +int __old_semctl (int semid, int semnum, int cmd, ...); +int __new_semctl (int semid, int semnum, int cmd, ...); + +int +__old_semctl (int semid, int semnum, int cmd, ...) +{ + union semun arg; + va_list ap; + + va_start (ap, cmd); + + /* Get the argument. */ + arg = va_arg (ap, union semun); + + va_end (ap); + + return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd, &arg); +} + +int +__new_semctl (int semid, int semnum, int cmd, ...) +{ + union semun arg; + va_list ap; + + va_start (ap, cmd); + + /* Get the argument. */ + arg = va_arg (ap, union semun); + + va_end (ap); + +#if __ASSUME_32BITUIDS > 0 + return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64, &arg); +#else + switch (cmd) { + case SEM_STAT: + case IPC_STAT: + case IPC_SET: + break; + default: + return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd, &arg); + } + + { + int save_errno, result; + struct __old_semid_ds old; + struct semid_ds *buf; + +#ifdef __NR_getuid32 + if (__libc_missing_32bit_uids <= 0) + { + if (__libc_missing_32bit_uids < 0) + { + save_errno = errno; + + /* Test presence of new IPC by testing for getuid32 syscall. */ + result = INLINE_SYSCALL (getuid32, 0); + if (result == -1 && errno == ENOSYS) + __libc_missing_32bit_uids = 1; + else + __libc_missing_32bit_uids = 0; + __set_errno(save_errno); + } + if (__libc_missing_32bit_uids <= 0) + { + result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64, &arg); + return result; + } + } +#endif + + buf = arg.buf; + arg.buf = (struct semid_ds *)&old; + if (cmd == IPC_SET) + { + old.sem_perm.uid = buf->sem_perm.uid; + old.sem_perm.gid = buf->sem_perm.gid; + old.sem_perm.mode = buf->sem_perm.mode; + if (old.sem_perm.uid != buf->sem_perm.uid || + old.sem_perm.gid != buf->sem_perm.gid) + { + __set_errno (EINVAL); + return -1; + } + } + result = INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd, &arg); + if (result != -1 && cmd != IPC_SET) + { + memset(buf, 0, sizeof(*buf)); + buf->sem_perm.__key = old.sem_perm.__key; + buf->sem_perm.uid = old.sem_perm.uid; + buf->sem_perm.gid = old.sem_perm.gid; + buf->sem_perm.cuid = old.sem_perm.cuid; + buf->sem_perm.cgid = old.sem_perm.cgid; + buf->sem_perm.mode = old.sem_perm.mode; + buf->sem_perm.__seq = old.sem_perm.__seq; + buf->sem_otime = old.sem_otime; + buf->sem_ctime = old.sem_ctime; + buf->sem_nsems = old.sem_nsems; + } + return result; + } +#endif +} + +#if defined PIC && DO_VERSIONING +default_symbol_version (__new_semctl, semctl, GLIBC_2.2); +symbol_version (__old_semctl, semctl, GLIBC_2.0); +#else +weak_alias (__new_semctl, semctl); +#endif |