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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 int
00031 __posix_fadvise64_l64 (int fd, off64_t offset, off64_t len, int advise)
00032 {
00033 #ifdef __NR_fadvise64_64
00034   INTERNAL_SYSCALL_DECL (err);
00035   int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
00036                            __LONG_LONG_PAIR ((long) (offset >> 32),
00037                                           (long) offset),
00038                            __LONG_LONG_PAIR ((long) (len >> 32),
00039                                           (long) len),
00040                            advise);
00041   if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
00042     return 0;
00043 # ifndef __ASSUME_FADVISE64_64_SYSCALL
00044   if (INTERNAL_SYSCALL_ERRNO (ret, err) != ENOSYS)
00045 # endif
00046    return INTERNAL_SYSCALL_ERRNO (ret, err);
00047 #endif
00048 #ifndef __ASSUME_FADVISE64_64_SYSCALL
00049 # ifdef __NR_fadvise64
00050   if (len != (off_t) len)
00051     return EOVERFLOW;
00052 
00053   INTERNAL_SYSCALL_DECL (err2);
00054   int ret2 = INTERNAL_SYSCALL (fadvise64, err2, 5, fd,
00055                             __LONG_LONG_PAIR ((long) (offset >> 32),
00056                                            (long) offset),
00057                             (off_t) len, advise);
00058   if (!INTERNAL_SYSCALL_ERROR_P (ret2, err2))
00059     return 0;
00060   return INTERNAL_SYSCALL_ERRNO (ret2, err2);
00061 # else
00062   return ENOSYS;
00063 # endif
00064 #endif
00065 }
00066 
00067 #include <shlib-compat.h>
00068 
00069 #if SHLIB_COMPAT(libc, GLIBC_2_2, GLIBC_2_3_3)
00070 
00071 int
00072 attribute_compat_text_section
00073 __posix_fadvise64_l32 (int fd, off64_t offset, size_t len, int advise)
00074 {
00075   return __posix_fadvise64_l64 (fd, offset, len, advise);
00076 }
00077 
00078 versioned_symbol (libc, __posix_fadvise64_l64, posix_fadvise64, GLIBC_2_3_3);
00079 compat_symbol (libc, __posix_fadvise64_l32, posix_fadvise64, GLIBC_2_2);
00080 #else
00081 strong_alias (__posix_fadvise64_l64, posix_fadvise64);
00082 #endif