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

   1 /* Copyright (C) 1997, 1998, 2000, 2002, 2003 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 <assert.h>
  21 #include <errno.h>
  22 #include <unistd.h>
  23 #include <endian.h>
  24
  25 #include <sysdep-cancel.h>
  26 #include <sys/syscall.h>
  27 #include <bp-checks.h>
  28
  29 #include <kernel-features.h>
  30
  31 #ifdef __NR_pwrite64            /* Newer kernels renamed but it's the same.  */
  32 # ifdef __NR_pwrite
  33 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  34 # endif
  35 # define __NR_pwrite __NR_pwrite64
  36 #endif
  37
  38 #if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0
  39
  40 # if __ASSUME_PWRITE_SYSCALL == 0
  41 static ssize_t __emulate_pwrite (int fd, const void *buf, size_t count,
  42                                  off_t offset) internal_function;
  43 # endif
  44
  45 ssize_t
  46 __libc_pwrite (fd, buf, count, offset)
  47      int fd;
  48      const void *buf;
  49      size_t count;
  50      off_t offset;
  51 {
  52   ssize_t result;
  53
  54 #if (defined _ABI64 && _MIPS_SIM != _ABI64)
  55   assert (sizeof (offset) == 4);
  56 #endif
  57
  58   if (SINGLE_THREAD_P)
  59     {
  60       /* First try the syscall.  */
  61 #if (defined _ABIN32 && _MIPS_SIM == _ABIN32) || (defined _ABI64 && _MIPS_SIM == _ABI64)
  62       result = INLINE_SYSCALL (pwrite, 4, fd, CHECK_N (buf, count), count,
  63                                offset);
  64 #else
  65       result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count, 0,
  66                                __LONG_LONG_PAIR (offset >> 31, offset));
  67 #endif
  68 # if __ASSUME_PWRITE_SYSCALL == 0
  69       if (result == -1 && errno == ENOSYS)
  70         /* No system call available.  Use the emulation.  */
  71         result = __emulate_pwrite (fd, buf, count, offset);
  72 # endif
  73       return result;
  74     }
  75
  76   int oldtype = LIBC_CANCEL_ASYNC ();
  77
  78   /* First try the syscall.  */
  79 #if (defined _ABIN32 && _MIPS_SIM == _ABIN32) || (defined _ABI64 && _MIPS_SIM == _ABI64)
  80   result = INLINE_SYSCALL (pwrite, 4, fd, CHECK_N (buf, count), count, offset);
  81 #else
  82   result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count, 0,
  83                            __LONG_LONG_PAIR (offset >> 31, offset));
  84 #endif
  85 # if __ASSUME_PWRITE_SYSCALL == 0
  86   if (result == -1 && errno == ENOSYS)
  87     /* No system call available.  Use the emulation.  */
  88     result = __emulate_pwrite (fd, buf, count, offset);
  89 # endif
  90
  91   LIBC_CANCEL_RESET (oldtype);
  92
  93   return result;
  94 }
  95
  96 strong_alias (__libc_pwrite, __pwrite)
  97 weak_alias (__libc_pwrite, pwrite)
  98
  99 # define __libc_pwrite(fd, buf, count, offset) \
 100      static internal_function __emulate_pwrite (fd, buf, count, offset)
 101 #endif
 102
 103 #if __ASSUME_PWRITE_SYSCALL == 0
 104 # include <sysdeps/posix/pwrite.c>
 105 #endif