1 #define _GNU_SOURCE 2 #include <unistd.h> 3 #include "syscall.h" 4 copy_file_range(int fd_in,off_t * off_in,int fd_out,off_t * off_out,size_t len,unsigned flags)5ssize_t copy_file_range(int fd_in, off_t *off_in, int fd_out, off_t *off_out, size_t len, unsigned flags) 6 { 7 return syscall(SYS_copy_file_range, fd_in, off_in, fd_out, off_out, len, flags); 8 } 9