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1 | /* Copyright (C) 1997, 1998, 2000, 2002, 2003, 2004 |
2 | Free Software Foundation, Inc. | |
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 <errno.h> | |
22 | #ifndef NO_SGIDEFS_H | |
23 | #include <sgidefs.h> | |
24 | #endif | |
25 | #include <unistd.h> | |
26 | #include <endian.h> | |
27 | ||
28 | #include <sysdep-cancel.h> | |
29 | #include <sys/syscall.h> | |
30 | #include <bp-checks.h> | |
31 | ||
32 | #include <kernel-features.h> | |
33 | ||
34 | #ifdef __NR_pread64 /* Newer kernels renamed but it's the same. */ | |
35 | # ifdef __NR_pread | |
36 | # error "__NR_pread and __NR_pread64 both defined???" | |
37 | # endif | |
38 | # define __NR_pread __NR_pread64 | |
39 | #endif | |
40 | ||
41 | #if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0 | |
42 | ||
43 | # if __ASSUME_PREAD_SYSCALL == 0 | |
44 | static ssize_t __emulate_pread64 (int fd, void *buf, size_t count, | |
45 | off64_t offset) internal_function; | |
46 | # endif | |
47 | ||
48 | ssize_t | |
49 | __libc_pread64 (fd, buf, count, offset) | |
50 | int fd; | |
51 | void *buf; | |
52 | size_t count; | |
53 | off64_t offset; | |
54 | { | |
55 | ssize_t result; | |
56 | ||
57 | ||
58 | if (SINGLE_THREAD_P) | |
59 | { | |
60 | /* First try the syscall. */ | |
61 | #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64 | |
62 | result = INLINE_SYSCALL (pread, 4, fd, CHECK_N (buf, count), count, | |
63 | offset); | |
64 | #else | |
65 | result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count, 0, | |
66 | __LONG_LONG_PAIR ((off_t) (offset >> 32), | |
67 | (off_t) (offset & 0xffffffff))); | |
68 | #endif | |
69 | # if __ASSUME_PREAD_SYSCALL == 0 | |
70 | if (result == -1 && errno == ENOSYS) | |
71 | /* No system call available. Use the emulation. */ | |
72 | result = __emulate_pread64 (fd, buf, count, offset); | |
73 | # endif | |
74 | return result; | |
75 | } | |
76 | ||
77 | int oldtype = LIBC_CANCEL_ASYNC (); | |
78 | ||
79 | /* First try the syscall. */ | |
80 | #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64 | |
81 | result = INLINE_SYSCALL (pread, 4, fd, CHECK_N (buf, count), count, offset); | |
82 | #else | |
83 | result = INLINE_SYSCALL (pread, 6, fd, CHECK_N (buf, count), count, 0, | |
84 | __LONG_LONG_PAIR ((off_t) (offset >> 32), | |
85 | (off_t) (offset & 0xffffffff))); | |
86 | #endif | |
87 | # if __ASSUME_PREAD_SYSCALL == 0 | |
88 | if (result == -1 && errno == ENOSYS) | |
89 | /* No system call available. Use the emulation. */ | |
90 | result = __emulate_pread64 (fd, buf, count, offset); | |
91 | # endif | |
92 | ||
93 | LIBC_CANCEL_RESET (oldtype); | |
94 | ||
95 | return result; | |
96 | } | |
97 | ||
98 | weak_alias (__libc_pread64, __pread64) | |
99 | weak_alias (__libc_pread64, pread64) | |
100 | ||
101 | # define __libc_pread64(fd, buf, count, offset) \ | |
102 | static internal_function __emulate_pread64 (fd, buf, count, offset) | |
103 | #endif | |
104 | ||
105 | #if __ASSUME_PREAD_SYSCALL == 0 | |
106 | # include <sysdeps/posix/pread64.c> | |
107 | #endif |