Function read

user/src/file.rs:25–27

(fd: usize, buf: &mut [u8])

    sys_pipe(pipe_fd)
}
pub fn read(fd: usize, buf: &mut [u8]) -> isize {
    sys_read(fd, buf)
}
pub fn write(fd: usize, buf: &[u8]) -> isize {
    sys_write(fd, buf)
}