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6ddd37a4 | 1 | /* Copyright (C) 1997-2000,2002,2003,2004,2006 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 | |
41bdb6e2 AJ |
6 | modify it under the terms of the GNU Lesser General Public |
7 | License as published by the Free Software Foundation; either | |
8 | version 2.1 of the License, or (at your option) any later version. | |
af6f3906 UD |
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 | |
41bdb6e2 | 13 | Lesser General Public License for more details. |
af6f3906 | 14 | |
41bdb6e2 | 15 | You should have received a copy of the GNU Lesser General Public |
59ba27a6 PE |
16 | License along with the GNU C Library; if not, see |
17 | <http://www.gnu.org/licenses/>. */ | |
af6f3906 | 18 | |
cd682e15 | 19 | #include <assert.h> |
d71b808a | 20 | #include <errno.h> |
741845cb | 21 | #include <endian.h> |
af6f3906 | 22 | #include <unistd.h> |
0dee6738 | 23 | |
6ee8d334 | 24 | #include <sysdep-cancel.h> |
36ecfe56 | 25 | #include <sys/syscall.h> |
4bbb61e4 | 26 | #include <bp-checks.h> |
36ecfe56 | 27 | |
6ddd37a4 | 28 | #include <kernel-features.h> |
958f238f | 29 | |
4b172769 RM |
30 | #ifdef __NR_pwrite64 /* Newer kernels renamed but it's the same. */ |
31 | # ifdef __NR_pwrite | |
32 | # error "__NR_pwrite and __NR_pwrite64 both defined???" | |
33 | # endif | |
0f0d786f | 34 | # define __NR_pwrite __NR_pwrite64 |
4b172769 RM |
35 | #endif |
36 | ||
958f238f | 37 | #if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0 |
af6f3906 | 38 | |
958f238f | 39 | # if __ASSUME_PWRITE_SYSCALL == 0 |
d71b808a UD |
40 | static ssize_t __emulate_pwrite (int fd, const void *buf, size_t count, |
41 | off_t offset) internal_function; | |
958f238f | 42 | # endif |
d71b808a UD |
43 | |
44 | ||
6ee8d334 | 45 | static ssize_t |
ce6e047f UD |
46 | #ifdef NO_CANCELLATION |
47 | inline __attribute ((always_inline)) | |
48 | #endif | |
6ee8d334 | 49 | do_pwrite (int fd, const void *buf, size_t count, off_t offset) |
af6f3906 | 50 | { |
d71b808a UD |
51 | ssize_t result; |
52 | ||
53 | /* First try the syscall. */ | |
cd682e15 | 54 | assert (sizeof (offset) == 4); |
4bbb61e4 | 55 | result = INLINE_SYSCALL (pwrite, 5, fd, CHECK_N (buf, count), count, |
cd682e15 | 56 | __LONG_LONG_PAIR (offset >> 31, offset)); |
958f238f | 57 | # if __ASSUME_PWRITE_SYSCALL == 0 |
d71b808a UD |
58 | if (result == -1 && errno == ENOSYS) |
59 | /* No system call available. Use the emulation. */ | |
60 | result = __emulate_pwrite (fd, buf, count, offset); | |
958f238f | 61 | # endif |
d71b808a UD |
62 | |
63 | return result; | |
af6f3906 UD |
64 | } |
65 | ||
6ee8d334 UD |
66 | |
67 | ssize_t | |
68 | __libc_pwrite (fd, buf, count, offset) | |
69 | int fd; | |
70 | const void *buf; | |
71 | size_t count; | |
72 | off_t offset; | |
73 | { | |
74 | if (SINGLE_THREAD_P) | |
75 | return do_pwrite (fd, buf, count, offset); | |
76 | ||
77 | int oldtype = LIBC_CANCEL_ASYNC (); | |
78 | ||
79 | ssize_t result = do_pwrite (fd, buf, count, offset); | |
80 | ||
81 | LIBC_CANCEL_RESET (oldtype); | |
82 | ||
83 | return result; | |
84 | } | |
85 | ||
778c59c8 UD |
86 | strong_alias (__libc_pwrite, __pwrite) |
87 | weak_alias (__libc_pwrite, pwrite) | |
d71b808a | 88 | |
778c59c8 | 89 | # define __libc_pwrite(fd, buf, count, offset) \ |
d71b808a | 90 | static internal_function __emulate_pwrite (fd, buf, count, offset) |
36ecfe56 | 91 | #endif |
958f238f UD |
92 | |
93 | #if __ASSUME_PWRITE_SYSCALL == 0 | |
94 | # include <sysdeps/posix/pwrite.c> | |
95 | #endif |