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glibc  2.9
pwrite.c
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00001 /* Copyright (C) 1997, 1998, 1999, 2000, 2002, 2003, 2005
00002    Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1997.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #include <errno.h>
00022 #include <endian.h>
00023 #include <unistd.h>
00024 
00025 #include <sysdep-cancel.h>
00026 #include <sys/syscall.h>
00027 #include <bp-checks.h>
00028 
00029 ssize_t
00030 __libc_pwrite (fd, buf, count, offset)
00031      int fd;
00032      const void *buf;
00033      size_t count;
00034      off_t offset;
00035 {
00036   ssize_t result;
00037 
00038   if (SINGLE_THREAD_P)
00039     {
00040       /* In the ARM EABI, 64-bit values are aligned to even/odd register
00041         pairs for syscalls.  */
00042       result = INLINE_SYSCALL (pwrite64, 6, fd, CHECK_N (buf, count), count, 0,
00043                             __LONG_LONG_PAIR (offset >> 31, offset));
00044 
00045       return result;
00046     }
00047 
00048   int oldtype = LIBC_CANCEL_ASYNC ();
00049 
00050   /* In the ARM EABI, 64-bit values are aligned to even/odd register
00051      pairs for syscalls.  */
00052   result = INLINE_SYSCALL (pwrite64, 6, fd, CHECK_N (buf, count), count, 0,
00053                         __LONG_LONG_PAIR (offset >> 31, offset));
00054 
00055   LIBC_CANCEL_RESET (oldtype);
00056 
00057   return result;
00058 }
00059 
00060 strong_alias (__libc_pwrite, __pwrite)
00061 weak_alias (__libc_pwrite, pwrite)