/// Sets the stream associated with `fd` to "blocking" mode.
///
/// @return `0` on success, or libuv error code on failure.
int stream_set_blocking(int fd, bool blocking)
{
// Private loop to avoid conflict with existing watcher(s):
// uv__io_stop: Assertion `loop->watchers[w->fd] == w' failed.
uv_loop_t loop;
uv_pipe_t stream;
uv_loop_init(&loop);
uv_pipe_init(&loop, &stream, 0);
uv_pipe_open(&stream, fd);
int retval = uv_stream_set_blocking(STRUCT_CAST(uv_stream_t, &stream),
blocking);
uv_close(STRUCT_CAST(uv_handle_t, &stream), NULL);
uv_run(&loop, UV_RUN_NOWAIT); // not necessary, but couldn't hurt.
uv_loop_close(&loop);
return retval;
}
static void read_cb(uv_stream_t *stream, ssize_t cnt, const uv_buf_t *buf)
{
if (cnt <= 0) {
uv_read_stop(stream);
return;
}
int *interrupted = stream->data;
for (int i = 0; i < cnt; i++) {
if (buf->base[i] == CTRL_C) {
(*interrupted)++;
}
}
uv_loop_t write_loop;
uv_loop_init(&write_loop);
uv_tty_t out;
uv_tty_init(&write_loop, &out, fileno(stdout), 0);
uv_write_t req;
uv_buf_t b = {
.base = buf->base,
#ifdef WIN32
.len = (ULONG)cnt
#else
.len = (size_t)cnt
#endif
};
uv_write(&req, STRUCT_CAST(uv_stream_t, &out), &b, 1, NULL);
uv_run(&write_loop, UV_RUN_DEFAULT);
uv_close(STRUCT_CAST(uv_handle_t, &out), NULL);
uv_run(&write_loop, UV_RUN_DEFAULT);
if (uv_loop_close(&write_loop)) {
abort();
}
free(buf->base);
if (*interrupted >= 2) {
uv_walk(uv_default_loop(), walk_cb, NULL);
} else if (*interrupted == 1) {
fprintf(stderr, "interrupt received, press again to exit\n");
}
}
int main(int argc, char **argv)
{
if (!owns_tty()) {
fprintf(stderr, "process does not own the terminal\n");
exit(2);
}
if (!is_terminal(stdin)) {
fprintf(stderr, "stdin is not a terminal\n");
exit(2);
}
if (!is_terminal(stdout)) {
fprintf(stderr, "stdout is not a terminal\n");
exit(2);
}
if (!is_terminal(stderr)) {
fprintf(stderr, "stderr is not a terminal\n");
exit(2);
}
if (argc > 1) {
errno = 0;
int count = (int)strtol(argv[1], NULL, 10);
if (errno != 0) {
abort();
}
count = (count < 0 || count > 99999) ? 0 : count;
for (int i = 0; i < count; i++) {
printf("line%d\n", i);
}
fflush(stdout);
return 0;
}
int interrupted = 0;
uv_prepare_t prepare;
uv_prepare_init(uv_default_loop(), &prepare);
uv_prepare_start(&prepare, prepare_cb);
#ifndef WIN32
uv_tty_init(uv_default_loop(), &tty, fileno(stderr), 1);
#else
uv_tty_init(uv_default_loop(), &tty, fileno(stdin), 1);
uv_tty_init(uv_default_loop(), &tty_out, fileno(stdout), 0);
int width, height;
uv_tty_get_winsize(&tty_out, &width, &height);
#endif
uv_tty_set_mode(&tty, UV_TTY_MODE_RAW);
tty.data = &interrupted;
uv_read_start(STRUCT_CAST(uv_stream_t, &tty), alloc_cb, read_cb);
#ifndef WIN32
struct sigaction sa;
sigemptyset(&sa.sa_mask);
sa.sa_flags = 0;
sa.sa_handler = sig_handler;
sigaction(SIGHUP, &sa, NULL);
sigaction(SIGWINCH, &sa, NULL);
#else
uv_signal_t sigwinch_watcher;
uv_signal_init(uv_default_loop(), &sigwinch_watcher);
uv_signal_start(&sigwinch_watcher, sigwinch_cb, SIGWINCH);
#endif
uv_run(uv_default_loop(), UV_RUN_DEFAULT);
#ifndef WIN32
// XXX: Without this the SIGHUP handler is skipped on some systems.
sleep(100);
#endif
return 0;
}