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GCC Code Coverage Report

Directory:	./		Exec	Total	Coverage
File:	usr.bin/tmux/server.c	Lines:	0	200	0.0 %
Date:	2017-11-13	Branches:	0	137	0.0 %


/* $OpenBSD: server.c,v 1.177 2017/10/12 11:32:27 nicm Exp $ */

/*
 * Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
 *
 * Permission to use, copy, modify, and distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
 * IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
 * OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <sys/wait.h>

#include <errno.h>
#include <event.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <time.h>
#include <unistd.h>

#include "tmux.h"

/*
 * Main server functions.
 */

struct clients		 clients;

struct tmuxproc		*server_proc;
static int		 server_fd;
static int		 server_exit;
static struct event	 server_ev_accept;

struct cmd_find_state	 marked_pane;

static int	server_create_socket(void);
static int	server_loop(void);
static void	server_send_exit(void);
static void	server_accept(int, short, void *);
static void	server_signal(int);
static void	server_child_signal(void);
static void	server_child_exited(pid_t, int);
static void	server_child_stopped(pid_t, int);

/* Set marked pane. */
void
server_set_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
{
	cmd_find_clear_state(&marked_pane, 0);
	marked_pane.s = s;
	marked_pane.wl = wl;
	marked_pane.w = wl->window;
	marked_pane.wp = wp;
}

/* Clear marked pane. */
void
server_clear_marked(void)
{
	cmd_find_clear_state(&marked_pane, 0);
}

/* Is this the marked pane? */
int
server_is_marked(struct session *s, struct winlink *wl, struct window_pane *wp)
{
	if (s == NULL || wl == NULL || wp == NULL)
		return (0);
	if (marked_pane.s != s || marked_pane.wl != wl)
		return (0);
	if (marked_pane.wp != wp)
		return (0);
	return (server_check_marked());
}

/* Check if the marked pane is still valid. */
int
server_check_marked(void)
{
	return (cmd_find_valid_state(&marked_pane));
}

/* Create server socket. */
static int
server_create_socket(void)
{
	struct sockaddr_un	sa;
	size_t			size;
	mode_t			mask;
	int			fd;

	memset(&sa, 0, sizeof sa);
	sa.sun_family = AF_UNIX;
	size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
	if (size >= sizeof sa.sun_path) {
		errno = ENAMETOOLONG;
		return (-1);
	}
	unlink(sa.sun_path);

	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
		return (-1);

	mask = umask(S_IXUSR|S_IXGRP|S_IRWXO);
	if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1) {
		close(fd);
		return (-1);
	}
	umask(mask);

	if (listen(fd, 128) == -1) {
		close(fd);
		return (-1);
	}
	setblocking(fd, 0);

	return (fd);
}

/* Fork new server. */
int
server_start(struct tmuxproc *client, struct event_base *base, int lockfd,
    char *lockfile)
{
	int		 pair[2];
	struct job	*job;
	sigset_t	 set, oldset;

	if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
		fatal("socketpair failed");

	sigfillset(&set);
	sigprocmask(SIG_BLOCK, &set, &oldset);
	switch (fork()) {
	case -1:
		fatal("fork failed");
	case 0:
		break;
	default:
		sigprocmask(SIG_SETMASK, &oldset, NULL);
		close(pair[1]);
		return (pair[0]);
	}
	close(pair[0]);
	if (daemon(1, 0) != 0)
		fatal("daemon failed");
	proc_clear_signals(client, 0);
	if (event_reinit(base) != 0)
		fatalx("event_reinit failed");
	server_proc = proc_start("server");
	proc_set_signals(server_proc, server_signal);
	sigprocmask(SIG_SETMASK, &oldset, NULL);

	if (log_get_level() > 1)
		tty_create_log();
	if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
	    "tty ps", NULL) != 0)
		fatal("pledge failed");

	RB_INIT(&windows);
	RB_INIT(&all_window_panes);
	TAILQ_INIT(&clients);
	RB_INIT(&sessions);
	RB_INIT(&session_groups);
	key_bindings_init();

	gettimeofday(&start_time, NULL);

	server_fd = server_create_socket();
	if (server_fd == -1)
		fatal("couldn't create socket");
	server_update_socket();
	server_client_create(pair[1]);

	if (lockfd >= 0) {
		unlink(lockfile);
		free(lockfile);
		close(lockfd);
	}

	start_cfg();

	server_add_accept(0);

	proc_loop(server_proc, server_loop);

	LIST_FOREACH(job, &all_jobs, entry) {
		if (job->pid != -1)
			kill(job->pid, SIGTERM);
	}

	status_prompt_save_history();
	exit(0);
}

/* Server loop callback. */
static int
server_loop(void)
{
	struct client	*c;
	u_int		 items;

	do {
		items = cmdq_next(NULL);
		TAILQ_FOREACH(c, &clients, entry) {
			if (c->flags & CLIENT_IDENTIFIED)
				items += cmdq_next(c);
		}
	} while (items != 0);

	server_client_loop();

	if (!options_get_number(global_options, "exit-unattached")) {
		if (!RB_EMPTY(&sessions))
			return (0);
	}

	TAILQ_FOREACH(c, &clients, entry) {
		if (c->session != NULL)
			return (0);
	}

	/*
	 * No attached clients therefore want to exit - flush any waiting
	 * clients but don't actually exit until they've gone.
	 */
	cmd_wait_for_flush();
	if (!TAILQ_EMPTY(&clients))
		return (0);

	return (1);
}

/* Exit the server by killing all clients and windows. */
static void
server_send_exit(void)
{
	struct client	*c, *c1;
	struct session	*s, *s1;

	cmd_wait_for_flush();

	TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
		if (c->flags & CLIENT_SUSPENDED)
			server_client_lost(c);
		else
			proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
		c->session = NULL;
	}

	RB_FOREACH_SAFE(s, sessions, &sessions, s1)
		session_destroy(s, __func__);
}

/* Update socket execute permissions based on whether sessions are attached. */
void
server_update_socket(void)
{
	struct session	*s;
	static int	 last = -1;
	int		 n, mode;
	struct stat      sb;

	n = 0;
	RB_FOREACH(s, sessions, &sessions) {
		if (!(s->flags & SESSION_UNATTACHED)) {
			n++;
			break;
		}
	}

	if (n != last) {
		last = n;

		if (stat(socket_path, &sb) != 0)
			return;
		mode = sb.st_mode & ACCESSPERMS;
		if (n != 0) {
			if (mode & S_IRUSR)
				mode |= S_IXUSR;
			if (mode & S_IRGRP)
				mode |= S_IXGRP;
			if (mode & S_IROTH)
				mode |= S_IXOTH;
		} else
			mode &= ~(S_IXUSR|S_IXGRP|S_IXOTH);
		chmod(socket_path, mode);
	}
}

/* Callback for server socket. */
static void
server_accept(int fd, short events, __unused void *data)
{
	struct sockaddr_storage	sa;
	socklen_t		slen = sizeof sa;
	int			newfd;

	server_add_accept(0);
	if (!(events & EV_READ))
		return;

	newfd = accept(fd, (struct sockaddr *) &sa, &slen);
	if (newfd == -1) {
		if (errno == EAGAIN || errno == EINTR || errno == ECONNABORTED)
			return;
		if (errno == ENFILE || errno == EMFILE) {
			/* Delete and don't try again for 1 second. */
			server_add_accept(1);
			return;
		}
		fatal("accept failed");
	}
	if (server_exit) {
		close(newfd);
		return;
	}
	server_client_create(newfd);
}

/*
 * Add accept event. If timeout is nonzero, add as a timeout instead of a read
 * event - used to backoff when running out of file descriptors.
 */
void
server_add_accept(int timeout)
{
	struct timeval tv = { timeout, 0 };

	if (event_initialized(&server_ev_accept))
		event_del(&server_ev_accept);

	if (timeout == 0) {
		event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
		    NULL);
		event_add(&server_ev_accept, NULL);
	} else {
		event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
		    server_accept, NULL);
		event_add(&server_ev_accept, &tv);
	}
}

/* Signal handler. */
static void
server_signal(int sig)
{
	int	fd;

	log_debug("%s: %s", __func__, strsignal(sig));
	switch (sig) {
	case SIGTERM:
		server_exit = 1;
		server_send_exit();
		break;
	case SIGCHLD:
		server_child_signal();
		break;
	case SIGUSR1:
		event_del(&server_ev_accept);
		fd = server_create_socket();
		if (fd != -1) {
			close(server_fd);
			server_fd = fd;
			server_update_socket();
		}
		server_add_accept(0);
		break;
	case SIGUSR2:
		proc_toggle_log(server_proc);
		break;
	}
}

/* Handle SIGCHLD. */
static void
server_child_signal(void)
{
	int	 status;
	pid_t	 pid;

	for (;;) {
		switch (pid = waitpid(WAIT_ANY, &status, WNOHANG|WUNTRACED)) {
		case -1:
			if (errno == ECHILD)
				return;
			fatal("waitpid failed");
		case 0:
			return;
		}
		if (WIFSTOPPED(status))
			server_child_stopped(pid, status);
		else if (WIFEXITED(status) || WIFSIGNALED(status))
			server_child_exited(pid, status);
	}
}

/* Handle exited children. */
static void
server_child_exited(pid_t pid, int status)
{
	struct window		*w, *w1;
	struct window_pane	*wp;
	struct job		*job;

	RB_FOREACH_SAFE(w, windows, &windows, w1) {
		TAILQ_FOREACH(wp, &w->panes, entry) {
			if (wp->pid == pid) {
				wp->status = status;
				wp->flags |= PANE_STATUSREADY;

				log_debug("%%%u exited", wp->id);
				wp->flags |= PANE_EXITED;

				if (window_pane_destroy_ready(wp))
					server_destroy_pane(wp, 1);
				break;
			}
		}
	}

	LIST_FOREACH(job, &all_jobs, entry) {
		if (pid == job->pid) {
			job_died(job, status);	/* might free job */
			break;
		}
	}
}

/* Handle stopped children. */
static void
server_child_stopped(pid_t pid, int status)
{
	struct window		*w;
	struct window_pane	*wp;

	if (WSTOPSIG(status) == SIGTTIN || WSTOPSIG(status) == SIGTTOU)
		return;

	RB_FOREACH(w, windows, &windows) {
		TAILQ_FOREACH(wp, &w->panes, entry) {
			if (wp->pid == pid) {
				if (killpg(pid, SIGCONT) != 0)
					kill(pid, SIGCONT);
			}
		}
	}
}


Generated by: GCOVR (Version 3.3)

Line	Branch	Exec	Source
1			/* $OpenBSD: server.c,v 1.177 2017/10/12 11:32:27 nicm Exp $ */
2
3			/*
4			* Copyright (c) 2007 Nicholas Marriott <nicholas.marriott@gmail.com>
5			*
6			* Permission to use, copy, modify, and distribute this software for any
7			* purpose with or without fee is hereby granted, provided that the above
8			* copyright notice and this permission notice appear in all copies.
9			*
10			* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
11			* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
12			* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
13			* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
14			* WHATSOEVER RESULTING FROM LOSS OF MIND, USE, DATA OR PROFITS, WHETHER
15			* IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING
16			* OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
17			*/
18
19			#include <sys/types.h>
20			#include <sys/ioctl.h>
21			#include <sys/socket.h>
22			#include <sys/stat.h>
23			#include <sys/un.h>
24			#include <sys/wait.h>
25
26			#include <errno.h>
27			#include <event.h>
28			#include <fcntl.h>
29			#include <paths.h>
30			#include <signal.h>
31			#include <stdio.h>
32			#include <stdlib.h>
33			#include <string.h>
34			#include <termios.h>
35			#include <time.h>
36			#include <unistd.h>
37
38			#include "tmux.h"
39
40			/*
41			* Main server functions.
42			*/
43
44			struct clients clients;
45
46			struct tmuxproc *server_proc;
47			static int server_fd;
48			static int server_exit;
49			static struct event server_ev_accept;
50
51			struct cmd_find_state marked_pane;
52
53			static int server_create_socket(void);
54			static int server_loop(void);
55			static void server_send_exit(void);
56			static void server_accept(int, short, void *);
57			static void server_signal(int);
58			static void server_child_signal(void);
59			static void server_child_exited(pid_t, int);
60			static void server_child_stopped(pid_t, int);
61
62			/* Set marked pane. */
63			void
64			server_set_marked(struct session s, struct winlink wl, struct window_pane *wp)
65			{
66			cmd_find_clear_state(&marked_pane, 0);
67			marked_pane.s = s;
68			marked_pane.wl = wl;
69			marked_pane.w = wl->window;
70			marked_pane.wp = wp;
71			}
72
73			/* Clear marked pane. */
74			void
75			server_clear_marked(void)
76			{
77			cmd_find_clear_state(&marked_pane, 0);
78			}
79
80			/* Is this the marked pane? */
81			int
82			server_is_marked(struct session s, struct winlink wl, struct window_pane *wp)
83			{
84			if (s == NULL \|\| wl == NULL \|\| wp == NULL)
85			return (0);
86			if (marked_pane.s != s \|\| marked_pane.wl != wl)
87			return (0);
88			if (marked_pane.wp != wp)
89			return (0);
90			return (server_check_marked());
91			}
92
93			/* Check if the marked pane is still valid. */
94			int
95			server_check_marked(void)
96			{
97			return (cmd_find_valid_state(&marked_pane));
98			}
99
100			/* Create server socket. */
101			static int
102			server_create_socket(void)
103			{
104			struct sockaddr_un sa;
105			size_t size;
106			mode_t mask;
107			int fd;
108
109			memset(&sa, 0, sizeof sa);
110			sa.sun_family = AF_UNIX;
111			size = strlcpy(sa.sun_path, socket_path, sizeof sa.sun_path);
112			if (size >= sizeof sa.sun_path) {
113			errno = ENAMETOOLONG;
114			return (-1);
115			}
116			unlink(sa.sun_path);
117
118			if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
119			return (-1);
120
121			mask = umask(S_IXUSR\|S_IXGRP\|S_IRWXO);
122			if (bind(fd, (struct sockaddr *) &sa, sizeof(sa)) == -1) {
123			close(fd);
124			return (-1);
125			}
126			umask(mask);
127
128			if (listen(fd, 128) == -1) {
129			close(fd);
130			return (-1);
131			}
132			setblocking(fd, 0);
133
134			return (fd);
135			}
136
137			/* Fork new server. */
138			int
139			server_start(struct tmuxproc client, struct event_base base, int lockfd,
140			char *lockfile)
141			{
142			int pair[2];
143			struct job *job;
144			sigset_t set, oldset;
145
146			if (socketpair(AF_UNIX, SOCK_STREAM, PF_UNSPEC, pair) != 0)
147			fatal("socketpair failed");
148
149			sigfillset(&set);
150			sigprocmask(SIG_BLOCK, &set, &oldset);
151			switch (fork()) {
152			case -1:
153			fatal("fork failed");
154			case 0:
155			break;
156			default:
157			sigprocmask(SIG_SETMASK, &oldset, NULL);
158			close(pair[1]);
159			return (pair[0]);
160			}
161			close(pair[0]);
162			if (daemon(1, 0) != 0)
163			fatal("daemon failed");
164			proc_clear_signals(client, 0);
165			if (event_reinit(base) != 0)
166			fatalx("event_reinit failed");
167			server_proc = proc_start("server");
168			proc_set_signals(server_proc, server_signal);
169			sigprocmask(SIG_SETMASK, &oldset, NULL);
170
171			if (log_get_level() > 1)
172			tty_create_log();
173			if (pledge("stdio rpath wpath cpath fattr unix getpw recvfd proc exec "
174			"tty ps", NULL) != 0)
175			fatal("pledge failed");
176
177			RB_INIT(&windows);
178			RB_INIT(&all_window_panes);
179			TAILQ_INIT(&clients);
180			RB_INIT(&sessions);
181			RB_INIT(&session_groups);
182			key_bindings_init();
183
184			gettimeofday(&start_time, NULL);
185
186			server_fd = server_create_socket();
187			if (server_fd == -1)
188			fatal("couldn't create socket");
189			server_update_socket();
190			server_client_create(pair[1]);
191
192			if (lockfd >= 0) {
193			unlink(lockfile);
194			free(lockfile);
195			close(lockfd);
196			}
197
198			start_cfg();
199
200			server_add_accept(0);
201
202			proc_loop(server_proc, server_loop);
203
204			LIST_FOREACH(job, &all_jobs, entry) {
205			if (job->pid != -1)
206			kill(job->pid, SIGTERM);
207			}
208
209			status_prompt_save_history();
210			exit(0);
211			}
212
213			/* Server loop callback. */
214			static int
215			server_loop(void)
216			{
217			struct client *c;
218			u_int items;
219
220			do {
221			items = cmdq_next(NULL);
222			TAILQ_FOREACH(c, &clients, entry) {
223			if (c->flags & CLIENT_IDENTIFIED)
224			items += cmdq_next(c);
225			}
226			} while (items != 0);
227
228			server_client_loop();
229
230			if (!options_get_number(global_options, "exit-unattached")) {
231			if (!RB_EMPTY(&sessions))
232			return (0);
233			}
234
235			TAILQ_FOREACH(c, &clients, entry) {
236			if (c->session != NULL)
237			return (0);
238			}
239
240			/*
241			* No attached clients therefore want to exit - flush any waiting
242			* clients but don't actually exit until they've gone.
243			*/
244			cmd_wait_for_flush();
245			if (!TAILQ_EMPTY(&clients))
246			return (0);
247
248			return (1);
249			}
250
251			/* Exit the server by killing all clients and windows. */
252			static void
253			server_send_exit(void)
254			{
255			struct client c, c1;
256			struct session s, s1;
257
258			cmd_wait_for_flush();
259
260			TAILQ_FOREACH_SAFE(c, &clients, entry, c1) {
261			if (c->flags & CLIENT_SUSPENDED)
262			server_client_lost(c);
263			else
264			proc_send(c->peer, MSG_SHUTDOWN, -1, NULL, 0);
265			c->session = NULL;
266			}
267
268			RB_FOREACH_SAFE(s, sessions, &sessions, s1)
269			session_destroy(s, __func__);
270			}
271
272			/* Update socket execute permissions based on whether sessions are attached. */
273			void
274			server_update_socket(void)
275			{
276			struct session *s;
277			static int last = -1;
278			int n, mode;
279			struct stat sb;
280
281			n = 0;
282			RB_FOREACH(s, sessions, &sessions) {
283			if (!(s->flags & SESSION_UNATTACHED)) {
284			n++;
285			break;
286			}
287			}
288
289			if (n != last) {
290			last = n;
291
292			if (stat(socket_path, &sb) != 0)
293			return;
294			mode = sb.st_mode & ACCESSPERMS;
295			if (n != 0) {
296			if (mode & S_IRUSR)
297			mode \|= S_IXUSR;
298			if (mode & S_IRGRP)
299			mode \|= S_IXGRP;
300			if (mode & S_IROTH)
301			mode \|= S_IXOTH;
302			} else
303			mode &= ~(S_IXUSR\|S_IXGRP\|S_IXOTH);
304			chmod(socket_path, mode);
305			}
306			}
307
308			/* Callback for server socket. */
309			static void
310			server_accept(int fd, short events, __unused void *data)
311			{
312			struct sockaddr_storage sa;
313			socklen_t slen = sizeof sa;
314			int newfd;
315
316			server_add_accept(0);
317			if (!(events & EV_READ))
318			return;
319
320			newfd = accept(fd, (struct sockaddr *) &sa, &slen);
321			if (newfd == -1) {
322			if (errno == EAGAIN \|\| errno == EINTR \|\| errno == ECONNABORTED)
323			return;
324			if (errno == ENFILE \|\| errno == EMFILE) {
325			/* Delete and don't try again for 1 second. */
326			server_add_accept(1);
327			return;
328			}
329			fatal("accept failed");
330			}
331			if (server_exit) {
332			close(newfd);
333			return;
334			}
335			server_client_create(newfd);
336			}
337
338			/*
339			* Add accept event. If timeout is nonzero, add as a timeout instead of a read
340			* event - used to backoff when running out of file descriptors.
341			*/
342			void
343			server_add_accept(int timeout)
344			{
345			struct timeval tv = { timeout, 0 };
346
347			if (event_initialized(&server_ev_accept))
348			event_del(&server_ev_accept);
349
350			if (timeout == 0) {
351			event_set(&server_ev_accept, server_fd, EV_READ, server_accept,
352			NULL);
353			event_add(&server_ev_accept, NULL);
354			} else {
355			event_set(&server_ev_accept, server_fd, EV_TIMEOUT,
356			server_accept, NULL);
357			event_add(&server_ev_accept, &tv);
358			}
359			}
360
361			/* Signal handler. */
362			static void
363			server_signal(int sig)
364			{
365			int fd;
366
367			log_debug("%s: %s", __func__, strsignal(sig));
368			switch (sig) {
369			case SIGTERM:
370			server_exit = 1;
371			server_send_exit();
372			break;
373			case SIGCHLD:
374			server_child_signal();
375			break;
376			case SIGUSR1:
377			event_del(&server_ev_accept);
378			fd = server_create_socket();
379			if (fd != -1) {
380			close(server_fd);
381			server_fd = fd;
382			server_update_socket();
383			}
384			server_add_accept(0);
385			break;
386			case SIGUSR2:
387			proc_toggle_log(server_proc);
388			break;
389			}
390			}
391
392			/* Handle SIGCHLD. */
393			static void
394			server_child_signal(void)
395			{
396			int status;
397			pid_t pid;
398
399			for (;;) {
400			switch (pid = waitpid(WAIT_ANY, &status, WNOHANG\|WUNTRACED)) {
401			case -1:
402			if (errno == ECHILD)
403			return;
404			fatal("waitpid failed");
405			case 0:
406			return;
407			}
408			if (WIFSTOPPED(status))
409			server_child_stopped(pid, status);
410			else if (WIFEXITED(status) \|\| WIFSIGNALED(status))
411			server_child_exited(pid, status);
412			}
413			}
414
415			/* Handle exited children. */
416			static void
417			server_child_exited(pid_t pid, int status)
418			{
419			struct window w, w1;
420			struct window_pane *wp;
421			struct job *job;
422
423			RB_FOREACH_SAFE(w, windows, &windows, w1) {
424			TAILQ_FOREACH(wp, &w->panes, entry) {
425			if (wp->pid == pid) {
426			wp->status = status;
427			wp->flags \|= PANE_STATUSREADY;
428
429			log_debug("%%%u exited", wp->id);
430			wp->flags \|= PANE_EXITED;
431
432			if (window_pane_destroy_ready(wp))
433			server_destroy_pane(wp, 1);
434			break;
435			}
436			}
437			}
438
439			LIST_FOREACH(job, &all_jobs, entry) {
440			if (pid == job->pid) {
441			job_died(job, status); /* might free job */
442			break;
443			}
444			}
445			}
446
447			/* Handle stopped children. */
448			static void
449			server_child_stopped(pid_t pid, int status)
450			{
451			struct window *w;
452			struct window_pane *wp;
453
454			if (WSTOPSIG(status) == SIGTTIN \|\| WSTOPSIG(status) == SIGTTOU)
455			return;
456
457			RB_FOREACH(w, windows, &windows) {
458			TAILQ_FOREACH(wp, &w->panes, entry) {
459			if (wp->pid == pid) {
460			if (killpg(pid, SIGCONT) != 0)
461			kill(pid, SIGCONT);
462			}
463			}
464			}
465			}