sysdeps/unix/sysv/linux/mips/pwrite.c

   1 /* Copyright (C) 1997, 1998, 2000 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 #include <kernel-features.h>
  27
  28 #if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0
  29
  30 extern ssize_t __syscall_pwrite (int fd, const void *buf, size_t count,
  31                                  int dummy, off_t offset_hi, off_t offset_lo);
  32
  33 # if __ASSUME_PWRITE_SYSCALL == 0
  34 static ssize_t __emulate_pwrite (int fd, const void *buf, size_t count,
  35                                  off_t offset) internal_function;
  36 # endif
  37
  38 ssize_t
  39 __libc_pwrite (fd, buf, count, offset)
  40      int fd;
  41      const void *buf;
  42      size_t count;
  43      off_t offset;
  44 {
  45   ssize_t result;
  46
  47   /* First try the syscall.  */
  48 # if defined(__MIPSEB__)
  49   result = INLINE_SYSCALL (pwrite, 6, fd, buf, count, 0, 0, offset);
  50 # elif defined(__MIPSEL__)
  51   result = INLINE_SYSCALL (pwrite, 6, fd, buf, count, 0, offset, 0);
  52 # endif
  53 # if __ASSUME_PWRITE_SYSCALL == 0
  54   if (result == -1 && errno == ENOSYS)
  55     /* No system call available.  Use the emulation.  */
  56     result = __emulate_pwrite (fd, buf, count, offset);
  57 # endif
  58
  59   return result;
  60 }
  61
  62 strong_alias (__libc_pwrite, __pwrite)
  63 weak_alias (__libc_pwrite, pwrite)
  64
  65 # define __libc_pwrite(fd, buf, count, offset) \
  66      static internal_function __emulate_pwrite (fd, buf, count, offset)
  67 #endif
  68
  69 #if __ASSUME_PWRITE_SYSCALL == 0
  70 # include <sysdeps/posix/pwrite.c>
  71 #endif