1 /* Copyright (C) 1997, 1998, 2000, 2002, 2003, 2004, 2006
2 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4 Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
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.
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.
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
25 #include <sysdep-cancel.h>
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 # if __ASSUME_PREAD_SYSCALL == 0
41 static ssize_t
__emulate_pread64 (int fd
, void *buf
, size_t count
,
42 off64_t offset
) internal_function
;
46 __libc_pread64 (fd
, buf
, count
, offset
)
56 /* First try the syscall. */
57 result
= INLINE_SYSCALL (pread
, 6, fd
, CHECK_N (buf
, count
), count
, 0,
58 __LONG_LONG_PAIR ((off_t
) (offset
>> 32),
59 (off_t
) (offset
& 0xffffffff)));
60 # if __ASSUME_PREAD_SYSCALL == 0
61 if (result
== -1 && errno
== ENOSYS
)
62 /* No system call available. Use the emulation. */
63 result
= __emulate_pread64 (fd
, buf
, count
, offset
);
68 int oldtype
= LIBC_CANCEL_ASYNC ();
70 /* First try the syscall. */
71 result
= INLINE_SYSCALL (pread
, 6, fd
, CHECK_N (buf
, count
), count
, 0,
72 __LONG_LONG_PAIR ((off_t
) (offset
>> 32),
73 (off_t
) (offset
& 0xffffffff)));
74 # if __ASSUME_PREAD_SYSCALL == 0
75 if (result
== -1 && errno
== ENOSYS
)
76 /* No system call available. Use the emulation. */
77 result
= __emulate_pread64 (fd
, buf
, count
, offset
);
80 LIBC_CANCEL_RESET (oldtype
);
85 weak_alias (__libc_pread64
, __pread64
)
86 weak_alias (__libc_pread64
, pread64
)
88 # define __libc_pread64(fd, buf, count, offset) \
89 static internal_function __emulate_pread64 (fd, buf, count, offset)
92 #if __ASSUME_PREAD_SYSCALL == 0
93 # include <sysdeps/posix/pread64.c>