#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include <fcntl.h>

#include "../internal/syscall.h"

/*
 * posix_fadvise over SYS_fadvise64 (221). POSIX return convention, unlike
 * the rest of the family: an error NUMBER directly — 0 on success, else
 * the positive errno value (EBADF, ESPIPE, EINVAL, ...) — and errno is
 * left untouched. The raw syscall result is therefore mapped without the
 * syscall_ret() translation (which would write errno): a negative return
 * is negated, 0 stays 0. On x86_64 the syscall takes the offset as one
 * 64-bit value (fd, offset, len, advice) — no lo/hi split.
 */
int
posix_fadvise(int fd, off_t offset, off_t len, int advice)
{
    long r = __syscall4(SYS_fadvise64, fd, offset, len, advice);

    return r < 0 ? (int)-r : 0;
}