2 * llseek.c -- stub calling the llseek system call
4 * Copyright (C) 1994, 1995, 1996, 1997 Theodore Ts'o.
7 * This file may be redistributed under the terms of the GNU Library
8 * General Public License, version 2.
12 #define _LARGEFILE_SOURCE
13 #define _LARGEFILE64_SOURCE
16 #include <sys/types.h>
28 #include "et/com_err.h"
29 #include "ext2fs/ext2_io.h"
33 #if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE)
35 #define my_llseek lseek64
38 #if defined(HAVE_LLSEEK)
41 #ifndef HAVE_LLSEEK_PROTOTYPE
42 extern long long llseek (int fd, long long offset, int origin);
45 #define my_llseek llseek
47 #else /* ! HAVE_LLSEEK */
49 #if SIZEOF_LONG == SIZEOF_LONG_LONG
53 #else /* SIZEOF_LONG != SIZEOF_LONG_LONG */
55 #include <linux/unistd.h>
58 #define __NR__llseek 140
62 static int _llseek (unsigned int, unsigned long,
63 unsigned long, ext2_loff_t *, unsigned int);
65 static _syscall5(int,_llseek,unsigned int,fd,unsigned long,offset_high,
66 unsigned long, offset_low,ext2_loff_t *,result,
70 static ext2_loff_t my_llseek (int fd, ext2_loff_t offset, int origin)
76 retval = _llseek(fd, ((unsigned long long) offset) >> 32,
78 retval = syscall(__NR__llseek, fd, (unsigned long long) (offset >> 32),
80 ((unsigned long long) offset) & 0xffffffff,
82 return (retval == -1 ? (ext2_loff_t) retval : result);
85 #endif /* __alpha__ || __ia64__ */
87 #endif /* HAVE_LLSEEK */
88 #endif /* defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE) */
90 ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin)
93 static int do_compat = 0;
95 if ((sizeof(off_t) >= sizeof(ext2_loff_t)) ||
96 (offset < ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1))))
97 return lseek(fd, (off_t) offset, origin);
104 result = my_llseek (fd, offset, origin);
105 if (result == -1 && errno == ENOSYS) {
107 * Just in case this code runs on top of an old kernel
108 * which does not support the llseek system call
119 #define EINVAL EXT2_ET_INVALID_ARGUMENT
122 ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin)
124 #if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE)
125 return lseek64 (fd, offset, origin);
127 if ((sizeof(off_t) < sizeof(ext2_loff_t)) &&
128 (offset >= ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))) {
132 return lseek (fd, (off_t) offset, origin);