140 lines
2.8 KiB
C
140 lines
2.8 KiB
C
|
/*
|
||
|
|
* llseek.c -- stub calling the llseek system call
|
||
|
|
*
|
||
|
|
* Copyright (C) 1994, 1995, 1996, 1997 Theodore Ts'o.
|
||
|
|
*
|
||
|
|
* %Begin-Header%
|
||
|
|
* This file may be redistributed under the terms of the
|
||
|
|
* GNU Lesser General Public License.
|
||
|
|
* %End-Header%
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if HAVE_SYS_TYPES_H
|
||
|
|
#include <sys/types.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#if HAVE_ERRNO_H
|
||
|
|
#include <errno.h>
|
||
|
|
#endif
|
||
|
|
#if HAVE_UNISTD_H
|
||
|
|
#include <unistd.h>
|
||
|
|
#endif
|
||
|
|
#ifdef __MSDOS__
|
||
|
|
#include <io.h>
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#include "blkidP.h"
|
||
|
|
|
||
|
|
#ifdef __linux__
|
||
|
|
|
||
|
|
#if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE)
|
||
|
|
|
||
|
|
#define my_llseek lseek64
|
||
|
|
|
||
|
|
#elif defined(HAVE_LLSEEK)
|
||
|
|
#include <syscall.h>
|
||
|
|
|
||
|
|
#ifndef HAVE_LLSEEK_PROTOTYPE
|
||
|
|
extern long long llseek(int fd, long long offset, int origin);
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#define my_llseek llseek
|
||
|
|
|
||
|
|
#else /* ! HAVE_LLSEEK */
|
||
|
|
|
||
|
|
#if defined(__alpha__) || defined(__ia64__)
|
||
|
|
|
||
|
|
#define llseek lseek
|
||
|
|
|
||
|
|
#else /* !__alpha__ && !__ia64__*/
|
||
|
|
|
||
|
|
#include <linux/unistd.h>
|
||
|
|
|
||
|
|
#ifndef __NR__llseek
|
||
|
|
#define __NR__llseek 140
|
||
|
|
#endif
|
||
|
|
|
||
|
|
#ifndef __i386__
|
||
|
|
static int _llseek(unsigned int, unsigned long, unsigned long,
|
||
|
|
blkid_loff_t *, unsigned int);
|
||
|
|
|
||
|
|
static _syscall5(int, _llseek, unsigned int, fd, unsigned long, offset_high,
|
||
|
|
unsigned long, offset_low, blkid_loff_t *, result,
|
||
|
|
unsigned int, origin)
|
||
|
|
#endif
|
||
|
|
|
||
|
|
static blkid_loff_t my_llseek(int fd, blkid_loff_t offset, int origin)
|
||
|
|
{
|
||
|
|
blkid_loff_t result;
|
||
|
|
int retval;
|
||
|
|
|
||
|
|
#ifndef __i386__
|
||
|
|
retval = _llseek(fd, ((unsigned long long) offset) >> 32,
|
||
|
|
((unsigned long long)offset) & 0xffffffff,
|
||
|
|
&result, origin);
|
||
|
|
#else
|
||
|
|
retval = syscall(__NR__llseek, fd, ((unsigned long long) offset) >> 32,
|
||
|
|
((unsigned long long)offset) & 0xffffffff,
|
||
|
|
&result, origin);
|
||
|
|
#endif
|
||
|
|
return (retval == -1 ? (blkid_loff_t) retval : result);
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* __alpha__ || __ia64__ */
|
||
|
|
|
||
|
|
#endif /* HAVE_LLSEEK */
|
||
|
|
|
||
|
|
blkid_loff_t blkid_llseek(int fd, blkid_loff_t offset, int whence)
|
||
|
|
{
|
||
|
|
blkid_loff_t result;
|
||
|
|
static int do_compat = 0;
|
||
|
|
|
||
|
|
if ((sizeof(off_t) >= sizeof(blkid_loff_t)) ||
|
||
|
|
(offset < ((blkid_loff_t) 1 << ((sizeof(off_t)*8) -1))))
|
||
|
|
return lseek(fd, (off_t) offset, whence);
|
||
|
|
|
||
|
|
if (do_compat) {
|
||
|
|
errno = EOVERFLOW;
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
|
||
|
|
result = my_llseek(fd, offset, whence);
|
||
|
|
if (result == -1 && errno == ENOSYS) {
|
||
|
|
/*
|
||
|
|
* Just in case this code runs on top of an old kernel
|
||
|
|
* which does not support the llseek system call
|
||
|
|
*/
|
||
|
|
do_compat++;
|
||
|
|
errno = EOVERFLOW;
|
||
|
|
}
|
||
|
|
return result;
|
||
|
|
}
|
||
|
|
|
||
|
|
#else /* !linux */
|
||
|
|
|
||
|
|
#ifndef EOVERFLOW
|
||
|
|
#ifdef EXT2_ET_INVALID_ARGUMENT
|
||
|
|
#define EOVERFLOW EXT2_ET_INVALID_ARGUMENT
|
||
|
|
#else
|
||
|
|
#define EOVERFLOW 112
|
||
|
|
#endif
|
||
|
|
#endif
|
||
|
|
|
||
|
|
blkid_loff_t blkid_llseek(int fd, blkid_loff_t offset, int origin)
|
||
|
|
{
|
||
|
|
#if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE)
|
||
|
|
return lseek64 (fd, offset, origin);
|
||
|
|
#else
|
||
|
|
if ((sizeof(off_t) < sizeof(blkid_loff_t)) &&
|
||
|
|
(offset >= ((blkid_loff_t) 1 << ((sizeof(off_t)*8) - 1)))) {
|
||
|
|
errno = EOVERFLOW;
|
||
|
|
return -1;
|
||
|
|
}
|
||
|
|
return lseek(fd, (off_t) offset, origin);
|
||
|
|
#endif
|
||
|
|
}
|
||
|
|
|
||
|
|
#endif /* linux */
|
||
|
|
|
||
|
|
|