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glibc  2.9
posix_fadvise.c
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00001 /* Copyright (C) 2003 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <errno.h>
00020 #include <fcntl.h>
00021 #include <sysdep.h>
00022 
00023 /* Advice the system about the expected behaviour of the application with
00024    respect to the file associated with FD.  */
00025 
00026 int
00027 posix_fadvise (int fd, off_t offset, off_t len, int advise)
00028 {
00029 #ifdef __NR_fadvise64
00030   INTERNAL_SYSCALL_DECL (err);
00031   int ret = INTERNAL_SYSCALL (fadvise64, err, 6, fd, 0,
00032                            __LONG_LONG_PAIR (offset >> 31, offset), len,
00033                            advise);
00034   if (INTERNAL_SYSCALL_ERROR_P (ret, err))
00035     return INTERNAL_SYSCALL_ERRNO (ret, err);
00036   return 0;
00037 #else
00038   return ENOSYS;
00039 #endif
00040 }