diff options
Diffstat (limited to 'REORG.TODO/sysdeps/unix/sysv/linux/posix_fadvise.c')
-rw-r--r-- | REORG.TODO/sysdeps/unix/sysv/linux/posix_fadvise.c | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/REORG.TODO/sysdeps/unix/sysv/linux/posix_fadvise.c b/REORG.TODO/sysdeps/unix/sysv/linux/posix_fadvise.c new file mode 100644 index 0000000000..222ac978e2 --- /dev/null +++ b/REORG.TODO/sysdeps/unix/sysv/linux/posix_fadvise.c @@ -0,0 +1,74 @@ +/* Copyright (C) 2003-2017 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public + License as published by the Free Software Foundation; either + version 2.1 of the License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <fcntl.h> +#include <sysdep.h> + +/* Advice the system about the expected behaviour of the application with + respect to the file associated with FD. */ + +#ifndef __OFF_T_MATCHES_OFF64_T + +/* Default implementation will use __NR_fadvise64 with expected argument + positions (for instance i386 and powerpc32 that uses __ALIGNMENT_ARG). + + Second option will be used by arm which define __NR_arm_fadvise64_64 + (redefined to __NR_fadvise64_64 in kernel-features.h) that behaves as + __NR_fadvise64_64 (without the aligment argument required for the ABI). + + Third option will be used by both tile 32-bits and mips o32. Tile + will set __ASSUME_FADVISE64_64_NO_ALIGN to issue a 6 argument syscall, + while mips will use a 7 argument one with __NR_fadvise64. + + s390 implements fadvice64_64 using a specific struct with arguments + packed inside. This is the only implementation handled in arch-specific + code. */ + +int +posix_fadvise (int fd, off_t offset, off_t len, int advise) +{ + INTERNAL_SYSCALL_DECL (err); +# if defined (__NR_fadvise64) && !defined (__ASSUME_FADVISE64_AS_64_64) + int ret = INTERNAL_SYSCALL_CALL (fadvise64, err, fd, + __ALIGNMENT_ARG SYSCALL_LL (offset), + len, advise); +# else +# ifdef __ASSUME_FADVISE64_64_6ARG + int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, advise, + SYSCALL_LL (offset), SYSCALL_LL (len)); +# else + +# ifdef __ASSUME_FADVISE64_64_NO_ALIGN +# undef __ALIGNMENT_ARG +# define __ALIGNMENT_ARG +# endif + +# ifndef __NR_fadvise64_64 +# define __NR_fadvise64_64 __NR_fadvise64 +# endif + + int ret = INTERNAL_SYSCALL_CALL (fadvise64_64, err, fd, + __ALIGNMENT_ARG SYSCALL_LL (offset), + SYSCALL_LL (len), advise); +# endif +# endif + if (INTERNAL_SYSCALL_ERROR_P (ret, err)) + return INTERNAL_SYSCALL_ERRNO (ret, err); + return 0; +} +#endif /* __OFF_T_MATCHES_OFF64_T */ |