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 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.
   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    Lesser General Public License for more details.
  14
  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
  18    02111-1307 USA.  */
  19
  20 #include <errno.h>
  21 #include <unistd.h>
  22 #include <endian.h>
  23
  24 #include <sysdep.h>
  25 #include <sys/syscall.h>
  26 #include <bp-checks.h>
  27
  28 #include <kernel-features.h>
  29
  30 #if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0
  31
  32 extern ssize_t __syscall_pwrite (int fd, const void *__unbounded buf, size_t count,
  33                                  int dummy, off_t offset_hi, off_t offset_lo);
  34
  35 # if __ASSUME_PWRITE_SYSCALL == 0
  36 static ssize_t __emulate_pwrite (int fd, const void *buf, size_t count,
  37                                  off_t offset) internal_function;
  38 # endif
  39
  40 ssize_t
  41 __libc_pwrite (fd, buf, count, offset)
  42      int fd;
  43      const void *buf;
  44      size_t count;
  45      off_t offset;
  46 {
  47   ssize_t result;
  48
  49   /* First try the syscall.  */
  50   result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count, 0,
  51                            __LONG_LONG_PAIR (0, offset));
  52 # if __ASSUME_PWRITE_SYSCALL == 0
  53   if (result == -1 && errno == ENOSYS)
  54     /* No system call available.  Use the emulation.  */
  55     result = __emulate_pwrite (fd, buf, count, offset);
  56 # endif
  57
  58   return result;
  59 }
  60
  61 strong_alias (__libc_pwrite, __pwrite)
  62 weak_alias (__libc_pwrite, pwrite)
  63
  64 # define __libc_pwrite(fd, buf, count, offset) \
  65      static internal_function __emulate_pwrite (fd, buf, count, offset)
  66 #endif
  67
  68 #if __ASSUME_PWRITE_SYSCALL == 0
  69 # include <sysdeps/posix/pwrite.c>
  70 #endif