X-Git-Url: http://git.tuebingen.mpg.de/?a=blobdiff_plain;f=gui.c;h=8d84e463d41dcdb0426b905b2208f5118c149f2c;hb=96fbecf492a660afbe7cbd5d45ae1dbe02f3acbf;hp=70981e898ba7de929d56a8ee448cbbeff10040c3;hpb=40659c0bb0602d4f2268bad6d2579d86e1b62289;p=paraslash.git

diff --git a/gui.c b/gui.c
index 70981e89..8d84e463 100644
--- a/gui.c
+++ b/gui.c
@@ -30,8 +30,6 @@
 INIT_GUI_ERRLISTS;
 static char *stat_content[NUM_STAT_ITEMS];
 
-static int signal_pipe;
-
 static struct gui_window {
 	WINDOW *win;
 } top, bot, sb, in, sep;
@@ -46,15 +44,17 @@ static struct ringbuffer *bot_win_rb;
 
 static unsigned scroll_position;
 
-static pid_t cmd_pid;
+static pid_t exec_pid;
 
-static int command_fds[2] = {-1, -1};
-static int stat_pipe = -1;
+static int exec_fds[2] = {-1, -1};
 static struct gui_args_info conf;
 static int loglevel;
 
-enum {GETCH_MODE, COMMAND_MODE, EXTERNAL_MODE};
-
+enum exec_status {
+	EXEC_IDLE, /* no command running */
+	EXEC_DCMD, /* para or display command running */
+	EXEC_XCMD, /* external command running */
+};
 
 /**
  * Codes for various colors.
@@ -82,113 +82,62 @@ struct gui_command {
 
 static struct gui_theme theme;
 
-static void com_help(void);
-static void com_reread_conf(void);
-static void com_enlarge_top_win(void);
-static void com_shrink_top_win(void);
-static void com_version(void);
-__noreturn static void com_quit(void);
-static void com_refresh(void);
-static void com_ll_incr(void);
-static void com_ll_decr(void);
-static void com_prev_theme(void);
-static void com_next_theme(void);
-static void com_scroll_up(void);
-static void com_scroll_down(void);
-static void com_page_up(void);
-static void com_page_down(void);
-static void com_cancel_scrolling(void);
-static void com_scroll_top(void);
-
-static struct gui_command command_list[] = {
-	{
-		.key = "?",
-		.name = "help",
-		.description = "print help",
-		.handler = com_help
-	}, {
-		.key = "+",
-		.name = "enlarge_win",
-		.description = "enlarge the top window",
-		.handler = com_enlarge_top_win
-	}, {
-		.key = "-",
-		.name = "shrink_win",
-		.description = "shrink the top window",
-		.handler = com_shrink_top_win
-	}, {
-		.key = "r",
-		.name = "reread_conf",
-		.description = "reread configuration file",
-		.handler = com_reread_conf
-	}, {
-		.key = "q",
-		.name = "quit",
-		.description = "exit para_gui",
-		.handler = com_quit
-	}, {
-		.key = "^L",
-		.name = "refresh",
-		.description = "redraw the screen",
-		.handler = com_refresh
-	}, {
-		.key = ".",
-		.name = "next_theme",
-		.description = "switch to next theme",
-		.handler = com_next_theme
-	}, {
-		.key = ",",
-		.name = "prev_theme",
-		.description = "switch to previous stream",
-		.handler = com_prev_theme
-	}, {
-		.key = ">",
-		.name = "ll_incr",
-		.description = "increase loglevel (decreases verbosity)",
-		.handler = com_ll_incr
-	}, {
-		.key = "<",
-		.name = "ll_decr",
-		.description = "decrease loglevel (increases verbosity)",
-		.handler = com_ll_decr
-	}, {
-		.key = "V",
-		.name = "version",
-		.description = "show the para_gui version",
-		.handler = com_version
-	}, {
-		.key = "<up>",
-		.name = "scroll_up",
-		.description = "scroll up one line",
-		.handler = com_scroll_up
-	}, {
-		.key = "<down>",
-		.name = "scroll_down",
-		.description = "scroll down one line",
-		.handler = com_scroll_down
-	}, {
-		.key = "<ppage>",
-		.name = "page_up",
-		.description = "scroll up one page",
-		.handler = com_page_up
-	}, {
-		.key = "<npage>",
-		.name = "page_down",
-		.description = "scroll down one page",
-		.handler = com_page_down
-	}, {
-		.key = "<home>",
-		.name = "scroll_top",
-		.description = "scroll to top of buffer",
-		.handler = com_scroll_top
-	}, {
-		.key = "<end>",
-		.name = "cancel_scroll",
-		.description = "deactivate scroll mode",
-		.handler = com_cancel_scrolling
-	}, {
-		.handler = NULL
-	}
+#define GUI_COMMANDS \
+	GUI_COMMAND(help, "?", "print help") \
+	GUI_COMMAND(enlarge_top_win, "+", "enlarge the top window") \
+	GUI_COMMAND(shrink_top_win, "-", "shrink the top window") \
+	GUI_COMMAND(reread_conf, "r", "reread configuration file") \
+	GUI_COMMAND(quit, "q", "exit para_gui") \
+	GUI_COMMAND(refresh, "^L", "redraw the screen") \
+	GUI_COMMAND(next_theme, ".", "switch to next theme") \
+	GUI_COMMAND(prev_theme, ",", "switch to previous theme") \
+	GUI_COMMAND(ll_incr, ">", "increase loglevel (decreases verbosity)") \
+	GUI_COMMAND(ll_decr, "<", "decrease loglevel (increases verbosity)") \
+	GUI_COMMAND(version, "V", "show the para_gui version") \
+	GUI_COMMAND(scroll_up, "<up>", "scroll up one line") \
+	GUI_COMMAND(scroll_down, "<down>", "scroll_down") \
+	GUI_COMMAND(page_up, "<ppage>", "scroll up one page") \
+	GUI_COMMAND(page_down, "<npage>", "scroll down one page") \
+	GUI_COMMAND(scroll_top, "<home>", "scroll to top of buffer") \
+	GUI_COMMAND(cancel_scroll, "<end>", "deactivate scroll mode") \
+
+/* declare command handlers */
+#define GUI_COMMAND(_c, _k, _d) \
+	static void com_ ## _c(void);
+GUI_COMMANDS
+
+#undef GUI_COMMAND
+
+/* define command array */
+#define GUI_COMMAND(_c, _k, _d) \
+	{ \
+		.key = _k, \
+		.name = #_c, \
+		.description = _d, \
+		.handler = com_ ## _c \
+	},
+
+static struct gui_command command_list[] = {GUI_COMMANDS {.name = NULL}};
+
+struct input_task {
+	struct task task;
+};
+
+struct status_task {
+	struct task task;
+	char *buf;
+	int bufsize, loaded;
+	struct timeval next_exec;
+	int fd;
+};
+
+#define COMMAND_BUF_SIZE 32768
+
+struct exec_task {
+	struct task task;
+	char command_buf[2][COMMAND_BUF_SIZE]; /* stdout/stderr of command */
+	int cbo[2]; /* command buf offsets */
+	unsigned flags[2]; /* passed to for_each_line() */
 };
 
 static int find_cmd_byname(char *name)
@@ -532,22 +481,12 @@ static __printf_2_3 void curses_log(int ll, const char *fmt,...)
 			msg[bytes - 1] = '\0'; /* cut trailing newline */
 		rb_add_entry(color, msg);
 		wrefresh(bot.win);
-	} else if (cmd_pid <= 0) /* no external command running */
+	} else if (exec_pid <= 0) /* no external command running */
 		vfprintf(stderr, fmt, ap);
 	va_end(ap);
 }
 __printf_2_3 void (*para_log)(int, const char*, ...) = curses_log;
 
-static void setup_signal_handling(void)
-{
-	signal_pipe = para_signal_init();
-	para_install_sighandler(SIGINT);
-	para_install_sighandler(SIGTERM);
-	para_install_sighandler(SIGCHLD);
-	para_install_sighandler(SIGWINCH);
-	para_install_sighandler(SIGUSR1);
-}
-
 static void shutdown_curses(void)
 {
 	def_prog_mode();
@@ -641,44 +580,70 @@ static void clear_all_items(void)
 	}
 }
 
-static void status_post_select(fd_set *rfds)
+static void status_pre_select(struct sched *s, struct task *t)
 {
-	static char *buf;
-	static int bufsize, loaded;
-	int ret, ret2;
+	struct status_task *st = container_of(t, struct status_task, task);
+
+	if (st->fd >= 0)
+		return para_fd_set(st->fd, &s->rfds, &s->max_fileno);
+	sched_request_barrier_or_min_delay(&st->next_exec, s);
+}
+
+static int status_post_select(struct sched *s, struct task *t)
+{
+	struct status_task *st = container_of(t, struct status_task, task);
 	size_t sz;
+	pid_t pid;
+	int ret, ret2;
 
-	if (stat_pipe < 0)
-		return;
-	if (loaded >= bufsize) {
-		if (bufsize > 1000 * 1000) {
-			loaded = 0;
-			return;
+	if (st->fd < 0) {
+		int fds[3] = {0, 1, 0};
+		/* Avoid busy loop */
+		if (tv_diff(&st->next_exec, now, NULL) > 0)
+			return 0;
+		st->next_exec.tv_sec = now->tv_sec + 2;
+		ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
+		if (ret < 0)
+			return 0;
+		ret = mark_fd_nonblocking(fds[1]);
+		if (ret < 0) {
+			close(fds[1]);
+			return 0;
 		}
-		bufsize += bufsize + 1000;
-		buf = para_realloc(buf, bufsize);
+		st->fd = fds[1];
+		return 0;
 	}
-	assert(loaded < bufsize);
-	ret = read_nonblock(stat_pipe, buf + loaded, bufsize - loaded,
-		rfds, &sz);
-	loaded += sz;
-	ret2 = for_each_stat_item(buf, loaded, update_item);
+
+	if (st->loaded >= st->bufsize) {
+		if (st->bufsize > 1000 * 1000) {
+			st->loaded = 0;
+			return 0;
+		}
+		st->bufsize += st->bufsize + 1000;
+		st->buf = para_realloc(st->buf, st->bufsize);
+	}
+	assert(st->loaded < st->bufsize);
+	ret = read_nonblock(st->fd, st->buf + st->loaded,
+		st->bufsize - st->loaded, &s->rfds, &sz);
+	st->loaded += sz;
+	ret2 = for_each_stat_item(st->buf, st->loaded, update_item);
 	if (ret < 0 || ret2 < 0) {
-		loaded = 0;
+		st->loaded = 0;
 		PARA_NOTICE_LOG("closing stat pipe: %s\n", para_strerror(-ret));
-		close(stat_pipe);
-		stat_pipe = -1;
+		close(st->fd);
+		st->fd = -1;
 		clear_all_items();
 		free(stat_content[SI_BASENAME]);
 		stat_content[SI_BASENAME] =
 			para_strdup("stat command terminated!?");
 		print_all_items();
-		return;
+		return 0;
 	}
 	sz = ret2; /* what is left */
-	if (sz > 0 && sz < loaded)
-		memmove(buf, buf + loaded - sz, sz);
-	loaded = sz;
+	if (sz > 0 && sz < st->loaded)
+		memmove(st->buf, st->buf + st->loaded - sz, sz);
+	st->loaded = sz;
+	return 0;
 }
 
 /*
@@ -809,8 +774,11 @@ reap_next_child:
 	ret = para_reap_child(&pid);
 	if (ret <= 0)
 		return;
-	if (pid == cmd_pid)
-		cmd_pid = 0;
+	if (pid == exec_pid) {
+		exec_pid = 0;
+		init_curses();
+		print_in_bar(COLOR_MSG, " ");
+	}
 	goto reap_next_child;
 }
 
@@ -916,213 +884,117 @@ static void reread_conf(void)
 /*
  * React to various signal-related events
  */
-static void signal_post_select(fd_set *rfds)
+static int signal_post_select(struct sched *s, __a_unused struct task *t)
 {
-	int ret = para_next_signal(rfds);
+	int ret = para_next_signal(&s->rfds);
+
 	if (ret <= 0)
-		return;
+		return 0;
 	switch (ret) {
 	case SIGTERM:
 		die(EXIT_FAILURE, "only the good die young (caught SIGTERM)\n");
-		return;
+		return 1;
 	case SIGWINCH:
 		if (curses_active()) {
 			shutdown_curses();
 			init_curses();
 			redraw_bot_win();
 		}
-		return;
+		return 1;
 	case SIGINT:
 		PARA_WARNING_LOG("caught SIGINT, reset\n");
 		/* Nothing to do. SIGINT killed our child which gets noticed
 		 * by do_select and resets everything.
 		 */
-		return;
+		return 1;
 	case SIGUSR1:
 		PARA_NOTICE_LOG("got SIGUSR1, rereading configuration\n");
 		reread_conf();
-		return;
+		return 1;
 	case SIGCHLD:
 		check_sigchld();
-		return;
+		return 1;
 	}
+	return 1;
 }
 
-static void status_pre_select(fd_set *rfds, int *max_fileno, struct timeval *tv)
+static enum exec_status exec_status(void)
 {
-	static struct timeval next_exec, atm, diff;
-	int ret, fds[3] = {0, 1, 0};
-	pid_t pid;
-
-	if (stat_pipe >= 0)
-		goto success;
-	/* Avoid busy loop */
-	gettimeofday(&atm, NULL);
-	if (tv_diff(&next_exec, &atm, &diff) > 0) {
-		if (tv_diff(&diff, tv, NULL) < 0)
-			*tv = diff;
-		return;
-	}
-	next_exec.tv_sec = atm.tv_sec + 2;
-	ret = para_exec_cmdline_pid(&pid, conf.stat_cmd_arg, fds);
-	if (ret < 0)
-		return;
-	ret = mark_fd_nonblocking(fds[1]);
-	if (ret < 0) {
-		close(fds[1]);
-		return;
-	}
-	stat_pipe = fds[1];
-success:
-	para_fd_set(stat_pipe, rfds, max_fileno);
+	if (exec_fds[0] >= 0 || exec_fds[1] >= 0)
+		return EXEC_DCMD;
+	if (exec_pid > 0)
+		return EXEC_XCMD;
+	return EXEC_IDLE;
 }
 
-#define COMMAND_BUF_SIZE 32768
-
-static void command_pre_select(int mode, fd_set *rfds, int *max_fileno)
+static void exec_pre_select(struct sched *s, __a_unused struct task *t)
 {
-	/* check command pipe only in COMMAND_MODE */
-	if (mode != COMMAND_MODE)
+	enum exec_status es = exec_status();
+
+	if (es != EXEC_DCMD)
 		return;
-	if (command_fds[0] >= 0)
-		para_fd_set(command_fds[0], rfds, max_fileno);
-	if (command_fds[1] >= 0)
-		para_fd_set(command_fds[1], rfds, max_fileno);
+	if (exec_fds[0] >= 0)
+		para_fd_set(exec_fds[0], &s->rfds, &s->max_fileno);
+	if (exec_fds[1] >= 0)
+		para_fd_set(exec_fds[1], &s->rfds, &s->max_fileno);
 }
 
-static int command_post_select(int mode, fd_set *rfds)
+static int exec_post_select(struct sched *s, struct task *t)
 {
+	struct exec_task *ct = container_of(t, struct exec_task, task);
 	int i, ret;
-	static char command_buf[2][COMMAND_BUF_SIZE];
-	static int cbo[2]; /* command buf offsets */
-	static unsigned flags[2]; /* for for_each_line() */
+	enum exec_status es = exec_status();
 
-	if (mode != COMMAND_MODE)
+	if (es != EXEC_DCMD)
 		return 0;
 	for (i = 0; i < 2; i++) {
 		size_t sz;
-		if (command_fds[i] < 0)
+		if (exec_fds[i] < 0)
 			continue;
-		ret = read_nonblock(command_fds[i],
-			command_buf[i] + cbo[i],
-			COMMAND_BUF_SIZE - 1 - cbo[i], rfds, &sz);
-		cbo[i] += sz;
-		sz = cbo[i];
-		cbo[i] = for_each_line(flags[i], command_buf[i], cbo[i],
-			add_output_line, &i);
-		if (sz != cbo[i]) { /* at least one line found */
+		ret = read_nonblock(exec_fds[i],
+			ct->command_buf[i] + ct->cbo[i],
+			COMMAND_BUF_SIZE - 1 - ct->cbo[i], &s->rfds, &sz);
+		ct->cbo[i] += sz;
+		sz = ct->cbo[i];
+		ct->cbo[i] = for_each_line(ct->flags[i], ct->command_buf[i],
+			ct->cbo[i], add_output_line, &i);
+		if (sz != ct->cbo[i]) { /* at least one line found */
 			wrefresh(bot.win);
-			flags[i] = 0;
+			ct->flags[i] = 0;
 		}
-		if (ret < 0) {
-			PARA_NOTICE_LOG("closing command fd %d: %s",
-				i, para_strerror(-ret));
-			close(command_fds[i]);
-			command_fds[i] = -1;
-			flags[i] = 0;
-			cbo[i] = 0;
-			if (command_fds[!i] < 0) /* both fds closed */
-				return -1;
+		if (ret < 0 || exec_pid == 0) {
+			if (ret < 0)
+				PARA_NOTICE_LOG("closing command fd %d: %s",
+					i, para_strerror(-ret));
+			close(exec_fds[i]);
+			exec_fds[i] = -1;
+			ct->flags[i] = 0;
+			ct->cbo[i] = 0;
+			if (exec_fds[!i] < 0) /* both fds closed */
+				return 1;
 		}
-		if (cbo[i] == COMMAND_BUF_SIZE - 1) {
+		if (ct->cbo[i] == COMMAND_BUF_SIZE - 1) {
 			PARA_NOTICE_LOG("discarding overlong line");
-			cbo[i] = 0;
-			flags[i] = FELF_DISCARD_FIRST;
+			ct->cbo[i] = 0;
+			ct->flags[i] = FELF_DISCARD_FIRST;
 		}
 	}
-	return 1;
-}
-
-static void input_pre_select(int mode, fd_set *rfds, int *max_fileno)
-{
-	if (mode == GETCH_MODE || mode == COMMAND_MODE)
-		para_fd_set(STDIN_FILENO, rfds, max_fileno);
-}
-
-static int input_post_select(int mode)
-{
-	int ret;
-
-	switch (mode) {
-	case COMMAND_MODE:
-		ret = wgetch(top.win);
-		if (ret != ERR && ret != KEY_RESIZE) {
-			if (cmd_pid)
-				kill(cmd_pid, SIGTERM);
-			return -1;
-		}
-		return 0;
-	case GETCH_MODE:
-		ret = wgetch(top.win);
-		if (ret != ERR && ret != KEY_RESIZE)
-			return ret;
-		return 0;
-	case EXTERNAL_MODE:
-		if (cmd_pid == 0)
-			return -1;
-		return 0;
-	default:
-		assert(false); /* bug */
-	}
+	return 0;
 }
 
-static void signal_pre_select(fd_set *rfds, int *max_fileno)
+static void input_pre_select(struct sched *s, __a_unused struct task *t)
 {
-	para_fd_set(signal_pipe, rfds, max_fileno);
-}
-
-/*
- * This is the core select loop. Besides the (internal) signal
- * pipe, the following other fds are checked according to the mode:
- *
- * GETCH_MODE: check stdin, return when key is pressed
- *
- * COMMAND_MODE: check command fds and stdin. Return when peer has closed both
- * stdout and stderr or when any key is pressed.
- *
- * EXTERNAL_MODE: Check only signal pipe. Used when an external command
- * is running. During that time curses is disabled.  Returns when
- * cmd_pid == 0.
- */
-static int do_select(int mode)
-{
-	fd_set rfds;
-	int ret, max_fileno;
-	struct timeval tv;
-
-repeat:
-	tv.tv_sec = conf.timeout_arg  / 1000;
-	tv.tv_usec = (conf.timeout_arg % 1000) * 1000;
-//	ret = refresh_status();
-	FD_ZERO(&rfds);
-	max_fileno = 0;
-	status_pre_select(&rfds, &max_fileno, &tv);
-	signal_pre_select(&rfds, &max_fileno);
-	command_pre_select(mode, &rfds, &max_fileno);
-	input_pre_select(mode, &rfds, &max_fileno);
-	ret = para_select(max_fileno + 1, &rfds, NULL, &tv);
-	if (ret <= 0)
-		goto check_return; /* skip fd checks */
-	signal_post_select(&rfds);
-	/* read command pipe if ready */
-	ret = command_post_select(mode, &rfds);
-	if (ret < 0)
-		return 0;
-	status_post_select(&rfds);
-check_return:
-	ret = input_post_select(mode);
-	if (ret != 0)
-		return ret;
-	goto repeat;
+	if (exec_status() != EXEC_XCMD)
+		para_fd_set(STDIN_FILENO, &s->rfds, &s->max_fileno);
 }
 
 /* read from command pipe and print data to bot window */
-static void exec_and_display_cmd(const char *cmd)
+static void exec_and_display(const char *file_and_args)
 {
 	int ret, fds[3] = {0, 1, 1};
 
-	outputf(COLOR_COMMAND, "%s", cmd);
-	ret = para_exec_cmdline_pid(&cmd_pid, cmd, fds);
+	outputf(COLOR_COMMAND, "%s", file_and_args);
+	ret = para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
 	if (ret < 0)
 		return;
 	ret = mark_fd_nonblocking(fds[1]);
@@ -1131,50 +1003,103 @@ static void exec_and_display_cmd(const char *cmd)
 	ret = mark_fd_nonblocking(fds[2]);
 	if (ret < 0)
 		goto fail;
-	command_fds[0] = fds[1];
-	command_fds[1] = fds[2];
-	if (do_select(COMMAND_MODE) >= 0)
-		PARA_INFO_LOG("command complete\n");
-	else
-		PARA_NOTICE_LOG("command aborted\n");
-	print_in_bar(COLOR_MSG, " ");
+	exec_fds[0] = fds[1];
+	exec_fds[1] = fds[2];
+	print_in_bar(COLOR_MSG, "hit any key to abort\n");
 	return;
 fail:
 	PARA_ERROR_LOG("%s\n", para_strerror(-ret));
-	close(command_fds[0]);
-	close(command_fds[1]);
+	close(exec_fds[0]);
+	close(exec_fds[1]);
 }
 
-static void para_cmd(char *cmd)
+static void exec_para(const char *args)
 {
-	char *c;
+	char *file_and_args;
 
-	print_in_bar(COLOR_MSG, "executing client command, hit any key to abort\n");
-	c = make_message(BINDIR "/para_client -- %s", cmd);
-	exec_and_display_cmd(c);
-	free(c);
-}
-
-static void display_cmd(char *cmd)
-{
-	print_in_bar(COLOR_MSG, "executing display command, hit any key to abort");
-	exec_and_display_cmd(cmd);
+	file_and_args = make_message(BINDIR "/para_client -- %s", args);
+	exec_and_display(file_and_args);
+	free(file_and_args);
 }
 
 /*
  * shutdown curses and stat pipe before executing external commands
  */
-static void external_cmd(char *cmd)
+static void exec_external(char *file_and_args)
 {
 	int fds[3] = {-1, -1, -1};
 
-	if (cmd_pid)
+	if (exec_pid)
 		return;
 	shutdown_curses();
-	if (para_exec_cmdline_pid(&cmd_pid, cmd, fds) < 0)
+	para_exec_cmdline_pid(&exec_pid, file_and_args, fds);
+}
+
+static void handle_command(int c)
+{
+	int i;
+
+	/* first check user-defined key bindings */
+	for (i = 0; i < conf.key_map_given; ++i) {
+		char *tmp, *handler, *arg;
+
+		tmp = para_strdup(conf.key_map_arg[i]);
+		if (!split_key_map(tmp, &handler, &arg)) {
+			free(tmp);
+			return;
+		}
+		if (strcmp(tmp, km_keyname(c))) {
+			free(tmp);
+			continue;
+		}
+		if (*handler == 'd')
+			exec_and_display(arg);
+		else if (*handler == 'x')
+			exec_external(arg);
+		else if (*handler == 'p')
+			exec_para(arg);
+		else if (*handler == 'i') {
+			int num = find_cmd_byname(arg);
+			if (num >= 0)
+				command_list[num].handler();
+		}
+		free(tmp);
 		return;
-	do_select(EXTERNAL_MODE);
-	init_curses();
+	}
+	/* not found, check internal key bindings */
+	for (i = 0; command_list[i].handler; i++) {
+		if (!strcmp(km_keyname(c), command_list[i].key)) {
+			command_list[i].handler();
+			return;
+		}
+	}
+	print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
+		km_keyname(c));
+}
+
+static int input_post_select(__a_unused struct sched *s, __a_unused struct task *t)
+{
+	int ret;
+	enum exec_status exs = exec_status();
+
+	if (exs == EXEC_XCMD)
+		return 0;
+	ret = wgetch(top.win);
+	if (ret == ERR || ret == KEY_RESIZE)
+		return 0;
+	if (exs == EXEC_IDLE) {
+		handle_command(ret);
+		return 0;
+	}
+	if (exec_pid != 0)
+		kill(exec_pid, SIGTERM);
+	return 0;
+}
+
+static void signal_pre_select(struct sched *s, struct task *t)
+{
+	struct signal_task *st = container_of(t, struct signal_task, task);
+	para_fd_set(st->fd, &s->rfds, &s->max_fileno);
 }
 
 static void print_scroll_msg(void)
@@ -1210,7 +1135,7 @@ static void com_scroll_top(void)
 	print_in_bar(COLOR_ERRMSG, "top of buffer is shown\n");
 }
 
-static void com_cancel_scrolling(void)
+static void com_cancel_scroll(void)
 {
 
 	if (scroll_position == 0) {
@@ -1436,48 +1361,6 @@ static void com_prev_theme(void)
 	com_refresh();
 }
 
-static void handle_command(int c)
-{
-	int i;
-
-	/* first check user-defined key bindings */
-	for (i = 0; i < conf.key_map_given; ++i) {
-		char *tmp, *handler, *arg;
-
-		tmp = para_strdup(conf.key_map_arg[i]);
-		if (!split_key_map(tmp, &handler, &arg)) {
-			free(tmp);
-			return;
-		}
-		if (strcmp(tmp, km_keyname(c))) {
-			free(tmp);
-			continue;
-		}
-		if (*handler == 'd')
-			display_cmd(arg);
-		else if (*handler == 'x')
-			external_cmd(arg);
-		else if (*handler == 'p')
-			para_cmd(arg);
-		else if (*handler == 'i') {
-			int num = find_cmd_byname(arg);
-			if (num >= 0)
-				command_list[num].handler();
-		}
-		free(tmp);
-		return;
-	}
-	/* not found, check internal key bindings */
-	for (i = 0; command_list[i].handler; i++) {
-		if (!strcmp(km_keyname(c), command_list[i].key)) {
-			command_list[i].handler();
-			return;
-		}
-	}
-	print_in_bar(COLOR_ERRMSG, "key '%s' is not bound, press ? for help",
-		km_keyname(c));
-}
-
 __noreturn static void print_help_and_die(void)
 {
 	struct ggo_help h = DEFINE_GGO_HELP(gui);
@@ -1487,27 +1370,68 @@ __noreturn static void print_help_and_die(void)
 	exit(0);
 }
 
-int main(int argc, char *argv[])
+static int setup_tasks_and_schedule(void)
 {
-	int ret;
+	struct sched sched = {
+		.default_timeout = {
+			.tv_sec = conf.timeout_arg  / 1000,
+			.tv_usec = (conf.timeout_arg % 1000) * 1000,
+		},
+	};
+	struct exec_task exec_task = {
+		.task = {
+			.status = "exec",
+			.pre_select = exec_pre_select,
+			.post_select = exec_post_select,
+		},
+	};
+	struct status_task status_task = {
+		.task = {
+			.status = "status",
+			.pre_select = status_pre_select,
+			.post_select = status_post_select,
+		},
+		.fd = -1
+	};
+	struct input_task input_task = {
+		.task = {
+			.status = "input",
+			.pre_select = input_pre_select,
+			.post_select = input_post_select,
+		},
+	};
+	struct signal_task signal_task = {
+		.task = {
+			.status = "signal",
+			.pre_select = signal_pre_select,
+			.post_select = signal_post_select,
+		},
+	};
+	signal_task.fd = para_signal_init();
+	para_install_sighandler(SIGINT);
+	para_install_sighandler(SIGTERM);
+	para_install_sighandler(SIGCHLD);
+	para_install_sighandler(SIGWINCH);
+	para_install_sighandler(SIGUSR1);
+
+	register_task(&sched, &exec_task.task);
+	register_task(&sched, &status_task.task);
+	register_task(&sched, &input_task.task);
+	register_task(&sched, &signal_task.task);
+	return schedule(&sched);
+}
 
+int main(int argc, char *argv[])
+{
 	gui_cmdline_parser(argc, argv, &conf); /* exits on errors */
 	loglevel = get_loglevel_by_name(conf.loglevel_arg);
 	version_handle_flag("gui", conf.version_given);
 	if (conf.help_given || conf.detailed_help_given)
 		print_help_and_die();
 	parse_config_file_or_die(false /* override */);
-	setup_signal_handling();
 	bot_win_rb = ringbuffer_new(RINGBUFFER_SIZE);
 	setlocale(LC_CTYPE, "");
 	initscr(); /* needed only once, always successful */
 	init_curses();
-	for (;;) {
-		print_status_bar();
-		ret = do_select(GETCH_MODE);
-		if (!ret)
-			continue;
-		print_in_bar(COLOR_MSG, " ");
-		handle_command(ret);
-	}
+	return setup_tasks_and_schedule() < 0? EXIT_FAILURE : EXIT_SUCCESS;
 }