sysdeps/unix/sysv/linux/mips/pwrite64.c

   1 /* Copyright (C) 1997, 1998, 2000, 2002, 2003, 2004
   2    Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ralf Baechle <ralf@gnu.org>, 1998.
   5
   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.
  10
  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.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library.  If not, see
  18    <http://www.gnu.org/licenses/>.  */
  19
  20 #include <errno.h>
  21 #ifndef NO_SGIDEFS_H
  22 #include <sgidefs.h>
  23 #endif
  24 #include <unistd.h>
  25 #include <endian.h>
  26
  27 #include <sysdep-cancel.h>
  28 #include <sys/syscall.h>
  29 #include <bp-checks.h>
  30
  31 #include <kernel-features.h>
  32
  33 #ifdef __NR_pwrite64            /* Newer kernels renamed but it's the same.  */
  34 # ifdef __NR_pwrite
  35 #  error "__NR_pwrite and __NR_pwrite64 both defined???"
  36 # endif
  37 # define __NR_pwrite __NR_pwrite64
  38 #endif
  39
  40 #if defined __NR_pwrite || __ASSUME_PWRITE_SYSCALL > 0
  41
  42 # if __ASSUME_PWRITE_SYSCALL == 0
  43 static ssize_t __emulate_pwrite64 (int fd, const void *buf, size_t count,
  44                                    off64_t offset) internal_function;
  45 # endif
  46
  47 ssize_t
  48 __libc_pwrite64 (fd, buf, count, offset)
  49      int fd;
  50      const void *buf;
  51      size_t count;
  52      off64_t offset;
  53 {
  54   ssize_t result;
  55
  56   if (SINGLE_THREAD_P)
  57     {
  58      /* First try the syscall.  */
  59 #if _MIPS_SIM == _ABIN32 || _MIPS_SIM == _ABI64
  60       result = INLINE_SYSCALL (pwrite, 4, fd, CHECK_N (buf, count), count,
  61                                offset);
  62 #else
  63      result = INLINE_SYSCALL (pwrite, 6, fd, CHECK_N (buf, count), count, 0,
  64                               __LONG_LONG_PAIR ((off_t) (offset >> 32),
  65                              (off_t) (offset & 0xffffffff)));
  66 #endif
  67 # if __ASSUME_PWRITE_SYSCALL == 0
  68      if (result == -1 && errno == ENOSYS)
  69      /* No system call available.  Use the emulation.  */
  70      result = __emulate_pwrite64 (fd, buf, count, offset);
  71 # endif
  72
  73      return result;
  74     }
  75
  76   int oldtype = LIBC_CANCEL_ASYNC ();
  77
  78   /* First try the syscall.  */
  79 #if _MIPS_SIM == _ABIN32 || _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 ((off_t) (offset >> 32),
  84                                              (off_t) (offset & 0xffffffff)));
  85 #endif
  86 # if __ASSUME_PWRITE_SYSCALL == 0
  87   if (result == -1 && errno == ENOSYS)
  88     /* No system call available.  Use the emulation.  */
  89     result = __emulate_pwrite64 (fd, buf, count, offset);
  90 # endif
  91
  92   LIBC_CANCEL_RESET (oldtype);
  93
  94   return result;
  95 }
  96
  97 weak_alias (__libc_pwrite64, __pwrite64)
  98 libc_hidden_weak (__pwrite64)
  99 weak_alias (__libc_pwrite64, pwrite64)
 100
 101 # define __libc_pwrite64(fd, buf, count, offset) \
 102      static internal_function __emulate_pwrite64 (fd, buf, count, offset)
 103 #endif
 104
 105 #if __ASSUME_PWRITE_SYSCALL == 0
 106 # include <sysdeps/posix/pwrite64.c>
 107 #endif