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- /* 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
- #if defined INTERNAL_SYSCALL && ! defined __TARGET_powerpc__
- int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
- {
- if (len != (off_t) len)
- return EOVERFLOW;
- INTERNAL_SYSCALL_DECL (err);
- int ret = INTERNAL_SYSCALL (posix_fadvise64, err, 5, fd,
- __LONG_LONG_PAIR ((long) (offset >> 32),
- (long) offset),
- (off_t) len, advice);
- if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
- return 0;
- return INTERNAL_SYSCALL_ERRNO (ret, err);
- }
- #else
- static __inline__ int syscall_posix_fadvise(int fd, off_t offset1, off_t offset2, off_t len, int advice);
- #define __NR_syscall_posix_fadvise64 __NR_posix_fadvise64
- _syscall4(int, syscall_posix_fadvise64, int, fd, __off64_t, offset,
- __off64_t, len, int, advice)
- int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
- {
- int ret = syscall_posix_fadvise64(fd, offset, len, advice);
- if (ret == -1)
- return errno;
- return ret;
- }
- #endif
- /* 32 bit implementation is kind of a pita */
- #elif __WORDSIZE == 32
- #if defined INTERNAL_SYSCALL && ! defined __TARGET_powerpc__
- int posix_fadvise64(int fd, __off64_t offset, __off64_t len, int advice)
- {
- INTERNAL_SYSCALL_DECL (err);
- int ret = INTERNAL_SYSCALL (fadvise64_64, err, 6, fd,
- __LONG_LONG_PAIR(offset >> 32, offset & 0xffffffff),
- __LONG_LONG_PAIR(len >> 32, len & 0xffffffff),
- advice);
- if (!INTERNAL_SYSCALL_ERROR_P (ret, err))
- return 0;
- return INTERNAL_SYSCALL_ERRNO (ret, err);
- }
- #elif defined _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)
- {
- int ret = __syscall_fadvise64_64(fd,
- __LONG_LONG_PAIR(offset >> 32, offset & 0xffffffff),
- __LONG_LONG_PAIR(len >> 32, len & 0xffffffff),
- advice);
- if (ret == -1)
- return errno;
- return ret;
- }
- #else
- #warning neither INTERNAL_SYSCALL nor _syscall6 has been defined for your machine :(
- #endif /* INTERNAL_SYSCALL */
- #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)
- {
- #warning This is not correct as far as SUSv3 is concerned.
- return ENOSYS;
- }
- #endif /* __NR_fadvise64_64 */
- #endif /* __UCLIBC_HAS_LFS__ */
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