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glibc/sysdeps/unix/sysv/linux/semctl.c
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/* Copyright (C) 1995-2016 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 <stdarg.h> | |
#include <sys/sem.h> | |
#include <ipc_priv.h> | |
#include <sysdep.h> | |
#include <string.h> | |
#include <sys/syscall.h> | |
#include <shlib-compat.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 */ | |
struct __old_semid_ds *__old_buf; | |
}; | |
/* Return identifier for array of NSEMS semaphores associated with | |
KEY. */ | |
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) | |
int __old_semctl (int semid, int semnum, int cmd, ...); | |
#endif | |
int __new_semctl (int semid, int semnum, int cmd, ...); | |
#if SHLIB_COMPAT (libc, GLIBC_2_0, GLIBC_2_2) | |
int | |
attribute_compat_text_section | |
__old_semctl (int semid, int semnum, int cmd, ...) | |
{ | |
union semun arg; | |
va_list ap; | |
/* Get the argument only if required. */ | |
arg.buf = NULL; | |
switch (cmd) | |
{ | |
case SETVAL: /* arg.val */ | |
case GETALL: /* arg.array */ | |
case SETALL: | |
case IPC_STAT: /* arg.buf */ | |
case IPC_SET: | |
case SEM_STAT: | |
case IPC_INFO: /* arg.__buf */ | |
case SEM_INFO: | |
va_start (ap, cmd); | |
arg = va_arg (ap, union semun); | |
va_end (ap); | |
break; | |
} | |
return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd, | |
&arg); | |
} | |
compat_symbol (libc, __old_semctl, semctl, GLIBC_2_0); | |
#endif | |
int | |
__new_semctl (int semid, int semnum, int cmd, ...) | |
{ | |
union semun arg; | |
va_list ap; | |
/* Get the argument only if required. */ | |
arg.buf = NULL; | |
switch (cmd) | |
{ | |
case SETVAL: /* arg.val */ | |
case GETALL: /* arg.array */ | |
case SETALL: | |
case IPC_STAT: /* arg.buf */ | |
case IPC_SET: | |
case SEM_STAT: | |
case IPC_INFO: /* arg.__buf */ | |
case SEM_INFO: | |
va_start (ap, cmd); | |
arg = va_arg (ap, union semun); | |
va_end (ap); | |
break; | |
} | |
return INLINE_SYSCALL (ipc, 5, IPCOP_semctl, semid, semnum, cmd | __IPC_64, | |
&arg); | |
} | |
versioned_symbol (libc, __new_semctl, semctl, GLIBC_2_2); |