Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 1 | /* |
| 2 | * llseek.c -- stub calling the llseek system call |
| 3 | * |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 4 | * Copyright (C) 1994, 1995, 1996, 1997 Theodore Ts'o. |
Theodore Ts'o | 19c78dc | 1997-04-29 16:17:09 +0000 | [diff] [blame] | 5 | * |
| 6 | * %Begin-Header% |
Theodore Ts'o | 543547a | 2010-05-17 21:31:56 -0400 | [diff] [blame] | 7 | * This file may be redistributed under the terms of the GNU Library |
| 8 | * General Public License, version 2. |
Theodore Ts'o | 19c78dc | 1997-04-29 16:17:09 +0000 | [diff] [blame] | 9 | * %End-Header% |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 10 | */ |
| 11 | |
Theodore Ts'o | dc5f68c | 2000-05-25 23:31:54 +0000 | [diff] [blame] | 12 | #define _LARGEFILE_SOURCE |
| 13 | #define _LARGEFILE64_SOURCE |
| 14 | |
Theodore Ts'o | d1154eb | 2011-09-18 17:34:37 -0400 | [diff] [blame] | 15 | #include "config.h" |
Theodore Ts'o | 1d2ff46 | 1997-10-19 23:00:21 +0000 | [diff] [blame] | 16 | #if HAVE_SYS_TYPES_H |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 17 | #include <sys/types.h> |
Theodore Ts'o | 1d2ff46 | 1997-10-19 23:00:21 +0000 | [diff] [blame] | 18 | #endif |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 19 | |
Theodore Ts'o | c555aeb | 1997-10-25 04:16:53 +0000 | [diff] [blame] | 20 | #if HAVE_ERRNO_H |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 21 | #include <errno.h> |
Theodore Ts'o | c555aeb | 1997-10-25 04:16:53 +0000 | [diff] [blame] | 22 | #endif |
Theodore Ts'o | 4cbe8af | 1997-08-10 23:07:40 +0000 | [diff] [blame] | 23 | #if HAVE_UNISTD_H |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 24 | #include <unistd.h> |
Theodore Ts'o | 4cbe8af | 1997-08-10 23:07:40 +0000 | [diff] [blame] | 25 | #endif |
Theodore Ts'o | 3cb6c50 | 1997-08-11 20:29:22 +0000 | [diff] [blame] | 26 | #ifdef __MSDOS__ |
| 27 | #include <io.h> |
| 28 | #endif |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 29 | #include "et/com_err.h" |
Theodore Ts'o | d40259f | 1997-10-20 00:44:26 +0000 | [diff] [blame] | 30 | #include "ext2fs/ext2_io.h" |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 31 | |
| 32 | #ifdef __linux__ |
| 33 | |
Theodore Ts'o | dc5f68c | 2000-05-25 23:31:54 +0000 | [diff] [blame] | 34 | #if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE) |
| 35 | |
| 36 | #define my_llseek lseek64 |
| 37 | |
Theodore Ts'o | 48e6e81 | 2003-07-06 00:36:48 -0400 | [diff] [blame] | 38 | #else |
| 39 | #if defined(HAVE_LLSEEK) |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 40 | #include <syscall.h> |
| 41 | |
Theodore Ts'o | b0b9c4d | 1997-10-20 23:36:30 +0000 | [diff] [blame] | 42 | #ifndef HAVE_LLSEEK_PROTOTYPE |
| 43 | extern long long llseek (int fd, long long offset, int origin); |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 44 | #endif |
| 45 | |
| 46 | #define my_llseek llseek |
| 47 | |
Theodore Ts'o | dc5f68c | 2000-05-25 23:31:54 +0000 | [diff] [blame] | 48 | #else /* ! HAVE_LLSEEK */ |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 49 | |
Theodore Ts'o | c2dbc18 | 2008-01-27 00:35:32 -0500 | [diff] [blame] | 50 | #if SIZEOF_LONG == SIZEOF_LONG_LONG |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 51 | |
| 52 | #define llseek lseek |
| 53 | |
Theodore Ts'o | c2dbc18 | 2008-01-27 00:35:32 -0500 | [diff] [blame] | 54 | #else /* SIZEOF_LONG != SIZEOF_LONG_LONG */ |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 55 | |
| 56 | #include <linux/unistd.h> |
| 57 | |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 58 | #ifndef __NR__llseek |
| 59 | #define __NR__llseek 140 |
| 60 | #endif |
| 61 | |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 62 | #ifndef __i386__ |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 63 | static int _llseek (unsigned int, unsigned long, |
| 64 | unsigned long, ext2_loff_t *, unsigned int); |
| 65 | |
| 66 | static _syscall5(int,_llseek,unsigned int,fd,unsigned long,offset_high, |
| 67 | unsigned long, offset_low,ext2_loff_t *,result, |
| 68 | unsigned int, origin) |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 69 | #endif |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 70 | |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 71 | static ext2_loff_t my_llseek (int fd, ext2_loff_t offset, int origin) |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 72 | { |
| 73 | ext2_loff_t result; |
| 74 | int retval; |
| 75 | |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 76 | #ifndef __i386__ |
| 77 | retval = _llseek(fd, ((unsigned long long) offset) >> 32, |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 78 | #else |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 79 | retval = syscall(__NR__llseek, fd, (unsigned long long) (offset >> 32), |
| 80 | #endif |
| 81 | ((unsigned long long) offset) & 0xffffffff, |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 82 | &result, origin); |
| 83 | return (retval == -1 ? (ext2_loff_t) retval : result); |
| 84 | } |
| 85 | |
Theodore Ts'o | 4381966 | 2000-10-25 02:06:09 +0000 | [diff] [blame] | 86 | #endif /* __alpha__ || __ia64__ */ |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 87 | |
Theodore Ts'o | dc5f68c | 2000-05-25 23:31:54 +0000 | [diff] [blame] | 88 | #endif /* HAVE_LLSEEK */ |
Theodore Ts'o | 48e6e81 | 2003-07-06 00:36:48 -0400 | [diff] [blame] | 89 | #endif /* defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE) */ |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 90 | |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 91 | ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 92 | { |
Phillip Susi | 274d46e | 2013-01-24 11:21:56 -0500 | [diff] [blame^] | 93 | #if SIZEOF_OFF_T >= SIZEOF_LONG_LONG |
| 94 | return lseek (fd, offset, origin); |
| 95 | #else |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 96 | ext2_loff_t result; |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 97 | static int do_compat = 0; |
| 98 | |
Phillip Susi | 274d46e | 2013-01-24 11:21:56 -0500 | [diff] [blame^] | 99 | if (do_compat) |
| 100 | goto fallback; |
Theodore Ts'o | efc6f62 | 2008-08-27 23:07:54 -0400 | [diff] [blame] | 101 | |
Theodore Ts'o | 1c27cac | 1997-08-14 17:20:42 +0000 | [diff] [blame] | 102 | result = my_llseek (fd, offset, origin); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 103 | if (result == -1 && errno == ENOSYS) { |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 104 | /* |
| 105 | * Just in case this code runs on top of an old kernel |
| 106 | * which does not support the llseek system call |
| 107 | */ |
| 108 | do_compat++; |
Phillip Susi | 274d46e | 2013-01-24 11:21:56 -0500 | [diff] [blame^] | 109 | fallback: |
| 110 | if (offset < ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1))) |
| 111 | return lseek(fd, (off_t) offset, origin); |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 112 | errno = EINVAL; |
Phillip Susi | 274d46e | 2013-01-24 11:21:56 -0500 | [diff] [blame^] | 113 | return -1; |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 114 | } |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 115 | return result; |
Phillip Susi | 274d46e | 2013-01-24 11:21:56 -0500 | [diff] [blame^] | 116 | #endif |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 117 | } |
| 118 | |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 119 | #else /* !linux */ |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 120 | |
Theodore Ts'o | 73f17cf | 1999-01-04 07:35:45 +0000 | [diff] [blame] | 121 | #ifndef EINVAL |
| 122 | #define EINVAL EXT2_ET_INVALID_ARGUMENT |
| 123 | #endif |
| 124 | |
Theodore Ts'o | d163b09 | 1997-10-03 17:42:28 +0000 | [diff] [blame] | 125 | ext2_loff_t ext2fs_llseek (int fd, ext2_loff_t offset, int origin) |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 126 | { |
Theodore Ts'o | 488f3c2 | 2004-09-17 17:47:12 -0400 | [diff] [blame] | 127 | #if defined(HAVE_LSEEK64) && defined(HAVE_LSEEK64_PROTOTYPE) |
| 128 | return lseek64 (fd, offset, origin); |
| 129 | #else |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 130 | if ((sizeof(off_t) < sizeof(ext2_loff_t)) && |
| 131 | (offset >= ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))) { |
Theodore Ts'o | 73f17cf | 1999-01-04 07:35:45 +0000 | [diff] [blame] | 132 | errno = EINVAL; |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 133 | return -1; |
| 134 | } |
| 135 | return lseek (fd, (off_t) offset, origin); |
Theodore Ts'o | 488f3c2 | 2004-09-17 17:47:12 -0400 | [diff] [blame] | 136 | #endif |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 137 | } |
| 138 | |
Theodore Ts'o | 50e1e10 | 1997-04-26 13:58:21 +0000 | [diff] [blame] | 139 | #endif /* linux */ |
Theodore Ts'o | f3db356 | 1997-04-26 13:34:30 +0000 | [diff] [blame] | 140 | |
| 141 | |