/* vi: set sw=4 ts=4: */ /* * posix_fadvise64() for uClibc * http://www.opengroup.org/onlinepubs/009695399/functions/posix_fadvise.html * * Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org> * * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball. */ #include <features.h> #include <unistd.h> #include <errno.h> #include <endian.h> #include <stdint.h> #include <sys/types.h> #include <sys/syscall.h> #include <fcntl.h> #ifdef __UCLIBC_HAS_LFS__ #ifdef __NR_fadvise64_64 /* 64 bit implementation is cake ... or more like pie ... */ #if __WORDSIZE == 64 #define __NR_posix_fadvise64 __NR_fadvise64_64 _syscall4(int, posix_fadvise64, int, fd, __off64_t, offset, __off64_t, len, int, advice); /* 32 bit implementation is kind of a pita */ #elif __WORDSIZE == 32 #ifdef _syscall6 /* workaround until everyone has _syscall6() */ #define __NR___syscall_fadvise64_64 __NR_fadvise64_64 static inline _syscall6(int, __syscall_fadvise64_64, int, fd, unsigned long, high_offset, unsigned long, low_offset, unsigned long, high_len, unsigned long, low_len, int, advice); int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice) { return (__syscall_fadvise64_64(fd, __LONG_LONG_PAIR(offset >> 32, offset & 0xffffffff), __LONG_LONG_PAIR(len >> 32, len & 0xffffffff), advice)); } #else #warning _syscall6 has not been defined for your machine :( #endif /* _syscall6 */ #else #error your machine is neither 32 bit or 64 bit ... it must be magical #endif #elif !defined __NR_fadvise64 /* This is declared as a strong alias in posix_fadvise.c if __NR_fadvise64 * is defined. */ int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice) { __set_errno(ENOSYS); return -1; } #endif /* __NR_fadvise64_64 */ #endif /* __UCLIBC_HAS_LFS__ */