1 /* Copyright (C) 1997,1998,1999,2000,2002,2003,2006
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 #if defined __NR_pread || __ASSUME_PREAD_SYSCALL > 0
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
;
40 __libc_pread (fd
, buf
, count
, offset
)
50 result
= INLINE_SYSCALL (pread
, 4, fd
, CHECK_N (buf
, count
), count
,
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
);
61 int oldtype
= LIBC_CANCEL_ASYNC ();
63 result
= INLINE_SYSCALL (pread
, 4, fd
, CHECK_N (buf
, count
), count
,
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
);
71 LIBC_CANCEL_RESET (oldtype
);
76 strong_alias (__libc_pread
, __pread
)
77 weak_alias (__libc_pread
, pread
)
79 # define __libc_pread(fd, buf, count, offset) \
80 static internal_function __emulate_pread (fd, buf, count, offset)
83 #if __ASSUME_PREAD_SYSCALL == 0
84 # include <sysdeps/posix/pread.c>