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glibc  2.9
posix_fadvise64.c
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00001 /* Copyright (C) 2003, 2004 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 #include <kernel-features.h>
00023 
00024 int __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise);
00025 int __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise);
00026 
00027 /* Advice the system about the expected behaviour of the application with
00028    respect to the file associated with FD.  */
00029 
00030 struct fadvise64_64_layout
00031 {
00032   int fd;
00033   off64_t offset;
00034   off64_t len;
00035   int advise;
00036 };
00037 
00038 int
00039 __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise)
00040 {
00041 #ifdef __NR_fadvise64_64
00042   struct fadvise64_64_layout parameters;
00043   INTERNAL_SYSCALL_DECL (err);
00044   
00045   parameters.fd = fd;
00046   parameters.offset = offset;
00047   parameters.len = len;
00048   parameters.advise = advise;
00049   int ret = INTERNAL_SYSCALL (fadvise64_64, err, 1, &parameters);
00050   if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
00051     return 0;
00052 # ifndef __ASSUME_FADVISE64_64_SYSCALL
00053   if (INTERNAL_SYSCALL_ERRNO (ret, err) != ENOSYS)
00054 # endif
00055    return INTERNAL_SYSCALL_ERRNO (ret, err);
00056 #endif
00057 #ifndef __ASSUME_FADVISE64_64_SYSCALL
00058 # ifdef __NR_fadvise64
00059   if (len != (off_t) len)
00060     return EOVERFLOW;
00061 
00062   INTERNAL_SYSCALL_DECL (err2);
00063   int ret2 = INTERNAL_SYSCALL (fadvise64, err2, 5, fd,
00064                             __LONG_LONG_PAIR ((long) (offset >> 32),
00065                                            (long) offset),
00066                             (off_t) len, advise);
00067   if (!INTERNAL_SYSCALL_ERROR_P (ret2, err2))
00068     return 0;
00069   return INTERNAL_SYSCALL_ERRNO (ret2, err2);
00070 # else
00071   return ENOSYS;
00072 # endif
00073 #endif
00074 }
00075 
00076 #include <shlib-compat.h>
00077 
00078 #if SHLIB_COMPAT(libc, GLIBC_2_2, GLIBC_2_3_3)
00079 
00080 int
00081 attribute_compat_text_section
00082 __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise)
00083 {
00084   return __posix_fadvise64_l64 (fd, offset, len, advise);
00085 }
00086 
00087 versioned_symbol (libc, __posix_fadvise64_l64, posix_fadvise64, GLIBC_2_3_3);
00088 compat_symbol (libc, __posix_fadvise64_l32, posix_fadvise64, GLIBC_2_2);
00089 #else
00090 strong_alias (__posix_fadvise64_l64, posix_fadvise64);
00091 #endif