sysdeps/unix/sysv/linux/powerpc/pread.c

   1 /* Copyright (C) 1997, 1998 Free Software Foundation, Inc.
   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
   6    modify it under the terms of the GNU Library General Public License as
   7    published by the Free Software Foundation; either version 2 of the
   8    License, or (at your option) any later version.
   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
  13    Library General Public License for more details.
  14
  15    You should have received a copy of the GNU Library General Public
  16    License along with the GNU C Library; see the file COPYING.LIB.  If not,
  17    write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  18    Boston, MA 02111-1307, USA.  */
  19
  20 #include <errno.h>
  21 #include <unistd.h>
  22
  23 #include <sysdep.h>
  24 #include <sys/syscall.h>
  25
  26 #ifdef __NR_pread
  27
  28 extern ssize_t __syscall_pread (int fd, void *buf, size_t count,
  29                                 off64_t offset);
  30
  31 static ssize_t __emulate_pread (int fd, void *buf, size_t count,
  32                                 off_t offset) internal_function;
  33
  34
  35 ssize_t
  36 __pread (fd, buf, count, offset)
  37      int fd;
  38      void *buf;
  39      size_t count;
  40      off_t offset;
  41 {
  42   ssize_t result;
  43
  44   /* First try the syscall.  */
  45   result = __syscall_pread (fd, buf, count, (off64_t) offset);
  46   if (result == -1 && errno == ENOSYS)
  47     /* No system call available.  Use the emulation.  */
  48     result = __emulate_pread (fd, buf, count, offset);
  49
  50   return result;
  51 }
  52
  53 weak_alias (__pread, pread)
  54
  55 #define __pread(fd, buf, count, offset) \
  56      static internal_function __emulate_pread (fd, buf, count, offset)
  57 #endif
  58 #include <sysdeps/posix/pread.c>