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top: Re-enable non-blocking I/O on stdin

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Using blocking I/O would cause updates to stop until a key was pressed.
This commit is contained in:
Tim Ledbetter 2023-08-16 18:02:08 +01:00 • committed by Sam Atkins
parent 174d6f1f51
commit f6dd512b65
1 changed files with 14 additions and 3 deletions
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17
Userland/Utilities/top.cpp
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@ -202,9 +202,12 @@ static bool check_quit()
}
static struct termios g_previous_tty_settings;
static int g_old_stdin_status_flags;
static ErrorOr<void> setup_tty()
{
g_old_stdin_status_flags = TRY(Core::System::fcntl(STDIN_FILENO, F_GETFL));
TRY(Core::System::fcntl(STDIN_FILENO, F_SETFL, g_old_stdin_status_flags | O_NONBLOCK));
g_previous_tty_settings = TRY(Core::System::tcgetattr(STDOUT_FILENO));
struct termios raw = g_previous_tty_settings;
@ -221,6 +224,10 @@ static void restore_tty()
auto maybe_error = Core::System::tcsetattr(STDOUT_FILENO, TCSAFLUSH, g_previous_tty_settings);
if (maybe_error.is_error())
warnln("Failed to reset original terminal state: {}", strerror(maybe_error.error().code()));
auto maybe_fcntl_error = Core::System::fcntl(STDIN_FILENO, F_SETFL, g_old_stdin_status_flags);
if (maybe_fcntl_error.is_error())
warnln("Error restoring STDIN status flags: {}", strerror(maybe_error.error().code()));
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
@ -255,7 +262,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
Vector<ThreadData*> threads;
auto prev = TRY(get_snapshot(top_option.pids_to_filter_by));
usleep(10000);
for (;;) {
bool should_quit = false;
while (!should_quit) {
if (g_window_size_changed) {
TRY(Core::System::ioctl(STDOUT_FILENO, TIOCGWINSZ, &g_window_size));
g_window_size_changed = false;
@ -339,9 +347,12 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
prev = move(current);
for (int sleep_slice = 0; sleep_slice < top_option.delay_time * 1000; sleep_slice += 100) {
if (check_quit())
exit(0);
should_quit = check_quit();
if (should_quit)
break;
usleep(100 * 1000);
}
}
return 0;
}