RGBCube/serenity
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top: Add support for quitting top by pressing q

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This commit is contained in:
James Mintram 2022-04-01 20:47:59 +01:00 • committed by Linus Groh
parent 3818840ee6
commit cd2f67c4ea
1 changed files with 29 additions and 1 deletions
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30
Userland/Utilities/top.cpp
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@ -177,6 +177,27 @@ static void parse_args(Main::Arguments arguments, TopOption& top_option)
args_parser.parse(arguments);
}
static bool check_quit()
{
char c = '\0';
read(STDIN_FILENO, &c, sizeof(c));
return c == 'q' || c == 'Q';
}
static int g_old_stdin;
static void restore_stdin()
{
fcntl(STDIN_FILENO, F_SETFL, g_old_stdin);
}
static void enable_nonblocking_stdin()
{
g_old_stdin = fcntl(STDIN_FILENO, F_GETFL);
fcntl(STDIN_FILENO, F_SETFL, g_old_stdin | O_NONBLOCK);
atexit(restore_stdin);
}
ErrorOr<int> serenity_main(Main::Arguments arguments)
{
TRY(Core::System::pledge("stdio rpath tty sigaction"));
@ -192,6 +213,8 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
TopOption top_option;
parse_args(arguments, top_option);
enable_nonblocking_stdin();
Vector<ThreadData*> threads;
auto prev = get_snapshot();
usleep(10000);
@ -277,6 +300,11 @@ ErrorOr<int> serenity_main(Main::Arguments arguments)
}
threads.clear_with_capacity();
prev = move(current);
sleep(top_option.delay_time);
for (int sleep_slice = 0; sleep_slice < top_option.delay_time * 1000; sleep_slice += 100) {
if (check_quit())
exit(0);
usleep(100 * 1000);
}
}
}