/*
* llseek.c -- stub calling the llseek system call
*
- * Copyright (C) 1994 Remy Card. This file may be redistributed
- * under the terms of the GNU Public License.
+ * Copyright (C) 1994, 1995, 1996, 1997 Theodore Ts'o.
+ *
+ * %Begin-Header%
+ * This file may be redistributed under the terms of the GNU Library
+ * General Public License, version 2.
+ * %End-Header%
*/
+#define _LARGEFILE_SOURCE
+#define _LARGEFILE64_SOURCE
+
+#include "config.h"
+#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>
-#include <linux/unistd.h>
+#endif
+#ifdef __MSDOS__
+#include <io.h>
+#endif
#include "et/com_err.h"
-#include "ext2fs/io.h"
+#include "ext2fs/ext2_io.h"
#ifdef __linux__
+#if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE)
+
+#define my_llseek lseek64
+
+#else
+#if 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 SIZEOF_LONG == SIZEOF_LONG_LONG
+
+#define llseek lseek
+
+#else /* SIZEOF_LONG != SIZEOF_LONG_LONG */
+
+#include <linux/unistd.h>
+
#ifndef __NR__llseek
#define __NR__llseek 140
#endif
+#ifndef __i386__
static int _llseek (unsigned int, unsigned long,
unsigned long, ext2_loff_t *, unsigned int);
static _syscall5(int,_llseek,unsigned int,fd,unsigned long,offset_high,
unsigned long, offset_low,ext2_loff_t *,result,
unsigned int, origin)
+#endif
-ext2_loff_t ext2_llseek (unsigned int fd, ext2_loff_t offset,
- unsigned int origin)
+static ext2_loff_t my_llseek (int fd, ext2_loff_t offset, int origin)
{
- unsigned long offset_high;
- unsigned long offset_low;
ext2_loff_t result;
int retval;
+
+#ifndef __i386__
+ retval = _llseek(fd, ((unsigned long long) offset) >> 32,
+#else
+ retval = syscall(__NR__llseek, fd, (unsigned long long) (offset >> 32),
+#endif
+ ((unsigned long long) offset) & 0xffffffff,
+ &result, origin);
+ return (retval == -1 ? (ext2_loff_t) retval : result);
+}
+
+#endif /* __alpha__ || __ia64__ */
+
+#endif /* HAVE_LLSEEK */
+#endif /* defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE) */
+
+ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin)
+{
+#if SIZEOF_OFF_T >= SIZEOF_LONG_LONG
+ return lseek (fd, offset, origin);
+#else
+ ext2_loff_t result;
static int do_compat = 0;
- if (do_compat) {
- compat_lseek:
- if ((sizeof(off_t) < sizeof(ext2_loff_t)) &&
- (offset >= ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))) {
- errno = -EINVAL;
- return -1;
- }
- return lseek (fd, (off_t) offset, origin);
- }
-
- offset_high = ((unsigned long long) offset) >> 32;
- offset_low = ((unsigned long long) offset) & 0xffffffff;
- retval = _llseek (fd, offset_high, offset_low, &result, origin);
- if (retval == -1 && errno == ENOSYS) {
+ if (do_compat)
+ goto fallback;
+
+ result = my_llseek (fd, offset, origin);
+ 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++;
- goto compat_lseek;
+ fallback:
+ if (offset < ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))
+ return lseek(fd, (off_t) offset, origin);
+ errno = EINVAL;
+ return -1;
}
- if (retval == -1)
- result = -1;
return result;
+#endif
}
-#else
+#else /* !linux */
-ext2_loff_t ext2_llseek (unsigned int fd, ext2_loff_t offset,
- unsigned int origin)
+#ifndef EINVAL
+#define EINVAL EXT2_ET_INVALID_ARGUMENT
+#endif
+
+ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin)
{
+#if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE)
+ return lseek64 (fd, offset, origin);
+#else
if ((sizeof(off_t) < sizeof(ext2_loff_t)) &&
(offset >= ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))) {
- errno = -EINVAL;
+ errno = EINVAL;
return -1;
}
return lseek (fd, (off_t) offset, origin);
+#endif
}
-#endif
+#endif /* linux */