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958f238f | 1 | /* Copyright (C) 1997, 1998, 1999 Free Software Foundation, Inc. |
af6f3906 UD |
2 | This file is part of the GNU C Library. |
3 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
4 | ||
5 | The GNU C Library is free software; you can redistribute it and/or | |
6 | modify it under the terms of the GNU Library General Public License as | |
7 | published by the Free Software Foundation; either version 2 of the | |
8 | License, or (at your option) any later version. | |
9 | ||
10 | The GNU C Library is distributed in the hope that it will be useful, | |
11 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
13 | Library General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Library General Public | |
16 | License along with the GNU C Library; see the file COPYING.LIB. If not, | |
17 | write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, | |
18 | Boston, MA 02111-1307, USA. */ | |
19 | ||
d71b808a | 20 | #include <errno.h> |
af6f3906 | 21 | #include <unistd.h> |
0dee6738 UD |
22 | |
23 | #include <sysdep.h> | |
36ecfe56 UD |
24 | #include <sys/syscall.h> |
25 | ||
958f238f UD |
26 | #include "kernel-features.h" |
27 | ||
28 | #if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0 | |
af6f3906 | 29 | |
0e103c6d UD |
30 | extern ssize_t __syscall_pread (int fd, void *buf, size_t count, |
31 | off_t offset_hi, off_t offset_lo); | |
d71b808a | 32 | |
958f238f | 33 | # if __ASSUME_PREAD_SYSCALL == 0 |
d71b808a UD |
34 | static ssize_t __emulate_pread (int fd, void *buf, size_t count, |
35 | off_t offset) internal_function; | |
958f238f | 36 | # endif |
d71b808a UD |
37 | |
38 | ||
af6f3906 | 39 | ssize_t |
d71b808a UD |
40 | __pread (fd, buf, count, offset) |
41 | int fd; | |
42 | void *buf; | |
43 | size_t count; | |
44 | off_t offset; | |
af6f3906 | 45 | { |
d71b808a UD |
46 | ssize_t result; |
47 | ||
48 | /* First try the syscall. */ | |
0dee6738 | 49 | result = INLINE_SYSCALL (pread, 5, fd, buf, count, 0, offset); |
958f238f | 50 | # if __ASSUME_PREAD_SYSCALL == 0 |
d71b808a UD |
51 | if (result == -1 && errno == ENOSYS) |
52 | /* No system call available. Use the emulation. */ | |
53 | result = __emulate_pread (fd, buf, count, offset); | |
958f238f | 54 | # endif |
d71b808a UD |
55 | |
56 | return result; | |
af6f3906 UD |
57 | } |
58 | ||
59 | weak_alias (__pread, pread) | |
d71b808a | 60 | |
958f238f | 61 | # define __pread(fd, buf, count, offset) \ |
d71b808a | 62 | static internal_function __emulate_pread (fd, buf, count, offset) |
36ecfe56 | 63 | #endif |
958f238f UD |
64 | |
65 | #if __ASSUME_PREAD_SYSCALL == 0 | |
66 | # include <sysdeps/posix/pread.c> | |
67 | #endif |