| /* |
| * 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 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 "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 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, 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 |
| |
| static ext2_loff_t my_llseek (int fd, ext2_loff_t offset, int origin) |
| { |
| 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) |
| { |
| ext2_loff_t result; |
| static int do_compat = 0; |
| |
| if ((sizeof(off_t) >= sizeof(ext2_loff_t)) || |
| (offset < ((ext2_loff_t) 1 << ((sizeof(off_t)*8) -1)))) |
| return lseek(fd, (off_t) offset, origin); |
| |
| if (do_compat) { |
| errno = EINVAL; |
| return -1; |
| } |
| |
| 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++; |
| errno = EINVAL; |
| } |
| return result; |
| } |
| |
| #else /* !linux */ |
| |
| #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; |
| return -1; |
| } |
| return lseek (fd, (off_t) offset, origin); |
| #endif |
| } |
| |
| #endif /* linux */ |
| |
| |