Function sendfile

net/basic_socket.cpp:145–156

}

ssize_t sendfile(int out_fd, int in_fd, off_t *offset, size_t count,
                 Timeout timeout) {
#ifdef __APPLE__
    off_t len = count;
    ssize_t ret = DOIO_ONCE(::sendfile(out_fd, in_fd, *offset, &len, nullptr, 0),
                  wait_for_fd_writable(out_fd, timeout));
    return (ret == 0) ? len : (int)ret;
#else
    return DOIO_ONCE(::sendfile(out_fd, in_fd, offset, count),
           wait_for_fd_writable(out_fd, timeout));
#endif
}

ssize_t read_n(int fd, void *buf, size_t count, Timeout timeout) {
    return DOIO_LOOP(read(fd, buf, count, timeout), BufStep(buf, count));