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// This is an open source non-commercial project. Dear PVS-Studio, please check
// it. PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <uv.h>
#ifdef _WIN32
# include <windows.h>
#else
# include <unistd.h>
#endif
// -V:STRUCT_CAST:641
#define STRUCT_CAST(Type, obj) ((Type *)(obj))
#define is_terminal(stream) (uv_guess_handle(fileno(stream)) == UV_TTY)
#define BUF_SIZE 0xfff
#define CTRL_C 0x03
#define CTRL_Q 0x11
uv_tty_t tty;
#ifdef _WIN32
typedef struct screen_size {
int width;
int height;
} ScreenSize;
ScreenSize screen_rect;
#endif
bool owns_tty(void)
{
#ifdef _WIN32
// XXX: We need to make proper detect owns tty
// HWND consoleWnd = GetConsoleWindow();
// DWORD dwProcessId;
// GetWindowThreadProcessId(consoleWnd, &dwProcessId);
// return GetCurrentProcessId() == dwProcessId;
return true;
#else
return getsid(0) == getpid();
#endif
}
static void walk_cb(uv_handle_t *handle, void *arg)
{
if (!uv_is_closing(handle)) {
uv_close(handle, NULL);
}
}
static void sig_handler(int signum)
{
switch (signum) {
case SIGWINCH: {
int width, height;
uv_tty_get_winsize(&tty, &width, &height);
fprintf(stderr, "rows: %d, cols: %d\n", height, width);
return;
}
case SIGHUP:
exit(42); // arbitrary exit code to test against
return;
default:
return;
}
}
static void alloc_cb(uv_handle_t *handle, size_t suggested, uv_buf_t *buf)
{
buf->len = BUF_SIZE;
buf->base = malloc(BUF_SIZE);
}
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;
#ifdef _WIN32
// HACK: Special-case to avoid relying on SIGWINCH on Windows.
// See note at Screen:try_resize().
bool invoke_sigwinch_handler = false;
#endif
for (int i = 0; i < cnt; i++) {
if (buf->base[i] == CTRL_C) {
(*interrupted)++;
#ifdef _WIN32
} else if (buf->base[i] == CTRL_Q) {
invoke_sigwinch_handler = true;
#endif
}
}
uv_loop_t write_loop;
uv_loop_init(&write_loop);
uv_tty_t out;
uv_tty_init(&write_loop, &out, fileno(stdout), 0);
#ifdef _WIN32
if (invoke_sigwinch_handler) {
int width, height;
uv_tty_get_winsize(&out, &width, &height);
if (screen_rect.width != width || screen_rect.height != height) {
screen_rect.width = width;
screen_rect.height = height;
// HACK: Invoke directly. See note at Screen:try_resize().
sig_handler(SIGWINCH);
uv_run(&write_loop, UV_RUN_NOWAIT);
}
} else {
#endif
uv_write_t req;
uv_buf_t b = {.base = buf->base, .len = (size_t)cnt};
uv_write(&req, STRUCT_CAST(uv_stream_t, &out), &b, 1, NULL);
uv_run(&write_loop, UV_RUN_DEFAULT);
#ifdef _WIN32
}
#endif
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");
}
}
static void prepare_cb(uv_prepare_t *handle)
{
fprintf(stderr, "tty ready\n");
uv_prepare_stop(handle);
}
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) {
int count = atoi(argv[1]);
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);
// uv_tty_t tty;
#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_t out;
uv_tty_init(uv_default_loop(), &out, fileno(stdout), 0);
int width;
int height;
uv_tty_get_winsize(&out, &width, &height);
screen_rect.width = width;
screen_rect.height = height;
uv_close((uv_handle_t *)&out, NULL);
#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;
}
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