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1 | /* Copyright (C) 1997,1998,1999,2000,2002,2003,2006 |
2 | Free Software Foundation, Inc. | |
aff4519d UD |
3 | This file is part of the GNU C Library. |
4 | Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997. | |
5 | ||
6 | The GNU C Library is free software; you can redistribute it and/or | |
7 | modify it under the terms of the GNU Lesser General Public | |
8 | License as published by the Free Software Foundation; either | |
9 | version 2.1 of the License, or (at your option) any later version. | |
10 | ||
11 | The GNU C Library is distributed in the hope that it will be useful, | |
12 | but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | Lesser General Public License for more details. | |
15 | ||
16 | You should have received a copy of the GNU Lesser General Public | |
17 | License along with the GNU C Library; if not, write to the Free | |
18 | Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
19 | 02111-1307 USA. */ | |
20 | ||
21 | #include <assert.h> | |
22 | #include <errno.h> | |
23 | #include <unistd.h> | |
24 | ||
25 | #include <sysdep-cancel.h> | |
26 | #include <sys/syscall.h> | |
27 | #include <bp-checks.h> | |
28 | ||
6ddd37a4 | 29 | #include <kernel-features.h> |
aff4519d UD |
30 | |
31 | #if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0 | |
32 | ||
33 | # if __ASSUME_PREAD_SYSCALL == 0 | |
34 | static ssize_t __emulate_pread (int fd, void *buf, size_t count, | |
35 | off_t offset) internal_function; | |
36 | # endif | |
37 | ||
38 | ||
39 | ssize_t | |
40 | __libc_pread (fd, buf, count, offset) | |
41 | int fd; | |
42 | void *buf; | |
43 | size_t count; | |
44 | off_t offset; | |
45 | { | |
46 | ssize_t result; | |
47 | ||
48 | if (SINGLE_THREAD_P) | |
49 | { | |
50 | result = INLINE_SYSCALL (pread, 4, fd, CHECK_N (buf, count), count, | |
51 | offset); | |
52 | # if __ASSUME_PREAD_SYSCALL == 0 | |
53 | if (result == -1 && errno == ENOSYS) | |
54 | /* No system call available. Use the emulation. */ | |
55 | result = __emulate_pread (fd, buf, count, offset); | |
56 | # endif | |
57 | ||
58 | return result; | |
59 | } | |
6ddd37a4 | 60 | |
aff4519d UD |
61 | int oldtype = LIBC_CANCEL_ASYNC (); |
62 | ||
63 | result = INLINE_SYSCALL (pread, 4, fd, CHECK_N (buf, count), count, | |
64 | offset); | |
65 | # if __ASSUME_PREAD_SYSCALL == 0 | |
66 | if (result == -1 && errno == ENOSYS) | |
67 | /* No system call available. Use the emulation. */ | |
68 | result = __emulate_pread (fd, buf, count, offset); | |
69 | # endif | |
70 | ||
71 | LIBC_CANCEL_RESET (oldtype); | |
72 | ||
73 | return result; | |
74 | } | |
75 | ||
76 | strong_alias (__libc_pread, __pread) | |
77 | weak_alias (__libc_pread, pread) | |
78 | ||
79 | # define __libc_pread(fd, buf, count, offset) \ | |
80 | static internal_function __emulate_pread (fd, buf, count, offset) | |
81 | #endif | |
82 | ||
83 | #if __ASSUME_PREAD_SYSCALL == 0 | |
84 | # include <sysdeps/posix/pread.c> | |
85 | #endif |