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glibc/sysdeps/unix/sysv/linux/i386/fcntl.c
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/* Copyright (C) 2000, 2002 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
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, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <assert.h> | |
#include <errno.h> | |
#include <fcntl.h> | |
#include <stdarg.h> | |
#include <sysdep-cancel.h> | |
#include <sys/syscall.h> | |
#include "../kernel-features.h" | |
extern int __syscall_fcntl (int __fd, int __cmd, ...); | |
#ifdef __NR_fcntl64 | |
extern int __syscall_fcntl64 (int __fd, int __cmd, ...); | |
#endif | |
#if __ASSUME_FCNTL64 == 0 | |
/* This variable is shared with all files that check for fcntl64. */ | |
int __have_no_fcntl64; | |
static int | |
do_fcntl (int fd, int cmd, void *arg) | |
{ | |
# ifdef __NR_fcntl64 | |
if (! __have_no_fcntl64) | |
{ | |
int result = INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg); | |
if (result >= 0 || errno != ENOSYS) | |
return result; | |
__have_no_fcntl64 = 1; | |
} | |
# endif | |
switch (cmd) | |
{ | |
case F_GETLK64: | |
/* Convert arg from flock64 to flock and back. */ | |
{ | |
struct flock fl; | |
struct flock64 *fl64 = arg; | |
int res; | |
fl.l_start = (off_t)fl64->l_start; | |
/* Check if we can represent the values with the smaller type. */ | |
if ((off64_t) fl.l_start != fl64->l_start) | |
{ | |
__set_errno (EOVERFLOW); | |
return -1; | |
} | |
fl.l_len = (off_t) fl64->l_len; | |
/* Check if we can represent the values with the smaller type. */ | |
if ((off64_t) fl.l_len != fl64->l_len) | |
{ | |
__set_errno (EOVERFLOW); | |
return -1; | |
} | |
fl.l_type = fl64->l_type; | |
fl.l_whence = fl64->l_whence; | |
fl.l_pid = fl64->l_pid; | |
res = INLINE_SYSCALL (fcntl, 3, fd, F_GETLK, &fl); | |
if (res != 0) | |
return res; | |
/* Everything ok, convert back. */ | |
fl64->l_type = fl.l_type; | |
fl64->l_whence = fl.l_whence; | |
fl64->l_start = fl.l_start; | |
fl64->l_len = fl.l_len; | |
fl64->l_pid = fl.l_pid; | |
return 0; | |
} | |
case F_SETLK64: | |
case F_SETLKW64: | |
/* Try to convert arg from flock64 to flock. */ | |
{ | |
struct flock fl; | |
struct flock64 *fl64 = arg; | |
fl.l_start = (off_t) fl64->l_start; | |
/* Check if we can represent the values with the smaller type. */ | |
if ((off64_t) fl.l_start != fl64->l_start) | |
{ | |
__set_errno (EOVERFLOW); | |
return -1; | |
} | |
fl.l_len = (off_t)fl64->l_len; | |
/* Check if we can represent the values with the smaller type. */ | |
if ((off64_t) fl.l_len != fl64->l_len) | |
{ | |
__set_errno (EOVERFLOW); | |
return -1; | |
} | |
fl.l_type = fl64->l_type; | |
fl.l_whence = fl64->l_whence; | |
fl.l_pid = fl64->l_pid; | |
assert (F_SETLK - F_SETLKW == F_SETLK64 - F_SETLKW64); | |
return INLINE_SYSCALL (fcntl, 3, fd, cmd + F_SETLK - F_SETLK64, &fl); | |
} | |
default: | |
return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg); | |
} | |
return -1; | |
} | |
#endif /* __ASSUME_FCNTL64 */ | |
int | |
__libc_fcntl (int fd, int cmd, ...) | |
{ | |
va_list ap; | |
void *arg; | |
va_start (ap, cmd); | |
arg = va_arg (ap, void *); | |
va_end (ap); | |
#if __ASSUME_FCNTL64 > 0 | |
if (SINGLE_THREAD_P) | |
return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg); | |
int oldtype = LIBC_CANCEL_ASYNC (); | |
int result = INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg); | |
#else | |
if (SINGLE_THREAD_P) | |
return do_fcntl (fd, cmd, arg); | |
int oldtype = LIBC_CANCEL_ASYNC (); | |
int result = do_fcntl (fd, cmd, arg); | |
#endif | |
LIBC_CANCEL_RESET (oldtype); | |
return result; | |
} | |
libc_hidden_def (__libc_fcntl) | |
weak_alias (__libc_fcntl, __fcntl) | |
libc_hidden_weak (__fcntl) | |
weak_alias (__libc_fcntl, fcntl) |