1 /* Copyright (C) 1997, 1998, 1999, 2000, 2002 Free Software Foundation, Inc.
2 This file is part of the GNU C Library.
3 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
5 The GNU C Library is free software; you can redistribute it and/or
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.
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 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, write to the Free
17 Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
26 #include <sys/syscall.h>
27 #include <bp-checks.h>
29 #include "kernel-features.h"
31 #ifdef __NR_pread64 /* Newer kernels renamed but it's the same. */
33 # error "__NR_pread and __NR_pread64 both defined???"
35 # define __NR_pread __NR_pread64
38 #if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0
40 /* The order of hi, lo depends on endianness. */
41 extern ssize_t
__syscall_pread (int fd
, void *__unbounded buf
, size_t count
,
42 off_t offset_hi
, off_t offset_lo
);
44 # if __ASSUME_PREAD_SYSCALL == 0
45 static ssize_t
__emulate_pread (int fd
, void *buf
, size_t count
,
46 off_t offset
) internal_function
;
51 __libc_pread (fd
, buf
, count
, offset
)
59 /* First try the syscall. */
60 assert (sizeof (offset
) == 4);
61 result
= INLINE_SYSCALL (pread
, 5, fd
, CHECK_N (buf
, count
), count
,
62 __LONG_LONG_PAIR (offset
>> 31, offset
));
63 # if __ASSUME_PREAD_SYSCALL == 0
64 if (result
== -1 && errno
== ENOSYS
)
65 /* No system call available. Use the emulation. */
66 result
= __emulate_pread (fd
, buf
, count
, offset
);
72 strong_alias (__libc_pread
, __pread
)
73 weak_alias (__libc_pread
, pread
)
75 # define __libc_pread(fd, buf, count, offset) \
76 static internal_function __emulate_pread (fd, buf, count, offset)
79 #if __ASSUME_PREAD_SYSCALL == 0
80 # include <sysdeps/posix/pread.c>