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/* Copyright (C) 2000,2002-2004,2006,2009,2010 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, see
<http://www.gnu.org/licenses/>. */
#include <assert.h>
#include <errno.h>
#include <sysdep-cancel.h> /* Must come before <fcntl.h>. */
#include <fcntl.h>
#include <stdarg.h>
#include <sys/syscall.h>
#include <kernel-features.h>
#ifndef __ASSUME_FCNTL64
/* This variable is shared with all files that check for fcntl64. */
int __have_no_fcntl64;
#endif
#ifdef __ASSUME_F_GETOWN_EX
# define miss_F_GETOWN_EX 0
#elif !defined __ASSUME_FCNTL64
static int miss_F_GETOWN_EX;
#endif
#if defined NO_CANCELLATION && !defined __ASSUME_FCNTL64
# define __fcntl_nocancel __libc_fcntl
#endif
#if !defined NO_CANCELLATION || !defined __ASSUME_FCNTL64
int
__fcntl_nocancel (int fd, int cmd, ...)
{
va_list ap;
void *arg;
va_start (ap, cmd);
arg = va_arg (ap, void *);
va_end (ap);
#ifndef __ASSUME_FCNTL64
# 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)
{
eoverflow:
__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)
goto eoverflow;
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)
goto eoverflow;
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);
}
case F_GETOWN:
if (! miss_F_GETOWN_EX)
{
INTERNAL_SYSCALL_DECL (err);
struct f_owner_ex fex;
int res = INTERNAL_SYSCALL (fcntl, err, 3, fd, F_GETOWN_EX, &fex);
if (!INTERNAL_SYSCALL_ERROR_P (res, err))
return fex.type == F_OWNER_GID ? -fex.pid : fex.pid;
# ifndef __ASSUME_F_GETOWN_EX
if (INTERNAL_SYSCALL_ERRNO (res, err) == EINVAL)
miss_F_GETOWN_EX = 1;
else
# endif
{
__set_errno (INTERNAL_SYSCALL_ERRNO (res, err));
return -1;
}
}
/* FALLTHROUGH */
default:
return INLINE_SYSCALL (fcntl, 3, fd, cmd, arg);
}
return -1;
#else
return INLINE_SYSCALL (fcntl64, 3, fd, cmd, arg);
#endif /* !__ASSUME_FCNTL64 */
}
#endif /* NO_CANCELLATION || !__ASSUME_FCNTL64 */
#ifndef __fcntl_nocancel
int
__libc_fcntl (int fd, int cmd, ...)
{
va_list ap;
void *arg;
va_start (ap, cmd);
arg = va_arg (ap, void *);
va_end (ap);
# ifdef __ASSUME_FCNTL64
if (SINGLE_THREAD_P || (cmd != F_SETLKW && cmd != F_SETLKW64))
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 || (cmd != F_SETLKW && cmd != F_SETLKW64))
return __fcntl_nocancel (fd, cmd, arg);
int oldtype = LIBC_CANCEL_ASYNC ();
int result = __fcntl_nocancel (fd, cmd, arg);
# endif
LIBC_CANCEL_RESET (oldtype);
return result;
}
#endif
libc_hidden_def (__libc_fcntl)
weak_alias (__libc_fcntl, __fcntl)
libc_hidden_weak (__fcntl)
weak_alias (__libc_fcntl, fcntl)
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