1: /* $OpenBSD$ */
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/file.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 <signal.h>
30: #include <stdlib.h>
31: #include <string.h>
32: #include <unistd.h>
33:
34: #include "tmux.h"
35:
36: static struct tmuxproc *client_proc;
37: static struct tmuxpeer *client_peer;
38: static int client_flags;
39: static struct event client_stdin;
40: static enum {
41: CLIENT_EXIT_NONE,
42: CLIENT_EXIT_DETACHED,
43: CLIENT_EXIT_DETACHED_HUP,
44: CLIENT_EXIT_LOST_TTY,
45: CLIENT_EXIT_TERMINATED,
46: CLIENT_EXIT_LOST_SERVER,
47: CLIENT_EXIT_EXITED,
48: CLIENT_EXIT_SERVER_EXITED,
49: } client_exitreason = CLIENT_EXIT_NONE;
50: static int client_exitval;
51: static enum msgtype client_exittype;
52: static const char *client_exitsession;
53: static const char *client_execshell;
54: static const char *client_execcmd;
55: static int client_attached;
56:
57: static __dead void client_exec(const char *,const char *);
58: static int client_get_lock(char *);
59: static int client_connect(struct event_base *, const char *, int);
60: static void client_send_identify(const char *, const char *);
61: static void client_stdin_callback(int, short, void *);
62: static void client_write(int, const char *, size_t);
63: static void client_signal(int);
64: static void client_dispatch(struct imsg *, void *);
65: static void client_dispatch_attached(struct imsg *);
66: static void client_dispatch_wait(struct imsg *, const char *);
67: static const char *client_exit_message(void);
68:
69: /*
70: * Get server create lock. If already held then server start is happening in
71: * another client, so block until the lock is released and return -2 to
72: * retry. Return -1 on failure to continue and start the server anyway.
73: */
74: static int
75: client_get_lock(char *lockfile)
76: {
77: int lockfd;
78:
79: log_debug("lock file is %s", lockfile);
80:
81: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1) {
82: log_debug("open failed: %s", strerror(errno));
83: return (-1);
84: }
85:
86: if (flock(lockfd, LOCK_EX|LOCK_NB) == -1) {
87: log_debug("flock failed: %s", strerror(errno));
88: if (errno != EAGAIN)
89: return (lockfd);
90: while (flock(lockfd, LOCK_EX) == -1 && errno == EINTR)
91: /* nothing */;
92: close(lockfd);
93: return (-2);
94: }
95: log_debug("flock succeeded");
96:
97: return (lockfd);
98: }
99:
100: /* Connect client to server. */
101: static int
102: client_connect(struct event_base *base, const char *path, int start_server)
103: {
104: struct sockaddr_un sa;
105: size_t size;
106: int fd, lockfd = -1, locked = 0;
107: char *lockfile = NULL;
108:
109: memset(&sa, 0, sizeof sa);
110: sa.sun_family = AF_UNIX;
111: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
112: if (size >= sizeof sa.sun_path) {
113: errno = ENAMETOOLONG;
114: return (-1);
115: }
116: log_debug("socket is %s", path);
117:
118: retry:
119: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
120: return (-1);
121:
122: log_debug("trying connect");
123: if (connect(fd, (struct sockaddr *)&sa, sizeof sa) == -1) {
124: log_debug("connect failed: %s", strerror(errno));
125: if (errno != ECONNREFUSED && errno != ENOENT)
126: goto failed;
127: if (!start_server)
128: goto failed;
129: close(fd);
130:
131: if (!locked) {
132: xasprintf(&lockfile, "%s.lock", path);
133: if ((lockfd = client_get_lock(lockfile)) < 0) {
134: log_debug("didn't get lock (%d)", lockfd);
135:
136: free(lockfile);
137: lockfile = NULL;
138:
139: if (lockfd == -2)
140: goto retry;
141: }
142: log_debug("got lock (%d)", lockfd);
143:
144: /*
145: * Always retry at least once, even if we got the lock,
146: * because another client could have taken the lock,
147: * started the server and released the lock between our
148: * connect() and flock().
149: */
150: locked = 1;
151: goto retry;
152: }
153:
154: if (lockfd >= 0 && unlink(path) != 0 && errno != ENOENT) {
155: free(lockfile);
156: close(lockfd);
157: return (-1);
158: }
159: fd = server_start(base, lockfd, lockfile);
160: }
161:
162: if (locked && lockfd >= 0) {
163: free(lockfile);
164: close(lockfd);
165: }
166: setblocking(fd, 0);
167: return (fd);
168:
169: failed:
170: if (locked) {
171: free(lockfile);
172: close(lockfd);
173: }
174: close(fd);
175: return (-1);
176: }
177:
178: /* Get exit string from reason number. */
179: const char *
180: client_exit_message(void)
181: {
182: static char msg[256];
183:
184: switch (client_exitreason) {
185: case CLIENT_EXIT_NONE:
186: break;
187: case CLIENT_EXIT_DETACHED:
188: if (client_exitsession != NULL) {
189: xsnprintf(msg, sizeof msg, "detached "
190: "(from session %s)", client_exitsession);
191: return (msg);
192: }
193: return ("detached");
194: case CLIENT_EXIT_DETACHED_HUP:
195: if (client_exitsession != NULL) {
196: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
197: "(from session %s)", client_exitsession);
198: return (msg);
199: }
200: return ("detached and SIGHUP");
201: case CLIENT_EXIT_LOST_TTY:
202: return ("lost tty");
203: case CLIENT_EXIT_TERMINATED:
204: return ("terminated");
205: case CLIENT_EXIT_LOST_SERVER:
206: return ("lost server");
207: case CLIENT_EXIT_EXITED:
208: return ("exited");
209: case CLIENT_EXIT_SERVER_EXITED:
210: return ("server exited");
211: }
212: return ("unknown reason");
213: }
214:
215: /* Client main loop. */
216: int
217: client_main(struct event_base *base, int argc, char **argv, int flags,
218: const char *shellcmd)
219: {
220: struct cmd *cmd;
221: struct cmd_list *cmdlist;
222: struct msg_command_data *data;
223: int cmdflags, fd, i;
224: const char *ttynam, *cwd;
225: pid_t ppid;
226: enum msgtype msg;
227: char *cause, path[PATH_MAX];
228: struct termios tio, saved_tio;
229: size_t size;
230:
231: /* Ignore SIGCHLD now or daemon() in the server will leave a zombie. */
232: signal(SIGCHLD, SIG_IGN);
233:
234: /* Save the flags. */
235: client_flags = flags;
236:
237: /* Set up the initial command. */
238: cmdflags = 0;
239: if (shellcmd != NULL) {
240: msg = MSG_SHELL;
241: cmdflags = CMD_STARTSERVER;
242: } else if (argc == 0) {
243: msg = MSG_COMMAND;
244: cmdflags = CMD_STARTSERVER;
245: } else {
246: msg = MSG_COMMAND;
247:
248: /*
249: * It sucks parsing the command string twice (in client and
250: * later in server) but it is necessary to get the start server
251: * flag.
252: */
253: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
254: if (cmdlist != NULL) {
255: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
256: if (cmd->entry->flags & CMD_STARTSERVER)
257: cmdflags |= CMD_STARTSERVER;
258: }
259: cmd_list_free(cmdlist);
260: }
261: }
262:
263: /* Create client process structure (starts logging). */
264: client_proc = proc_start("client", base, 0, client_signal);
265:
266: /* Initialize the client socket and start the server. */
267: fd = client_connect(base, socket_path, cmdflags & CMD_STARTSERVER);
268: if (fd == -1) {
269: if (errno == ECONNREFUSED) {
270: fprintf(stderr, "no server running on %s\n",
271: socket_path);
272: } else {
273: fprintf(stderr, "error connecting to %s (%s)\n",
274: socket_path, strerror(errno));
275: }
276: return (1);
277: }
278: client_peer = proc_add_peer(client_proc, fd, client_dispatch,
279: (void *)shellcmd);
280:
281: /* Save these before pledge(). */
282: if ((cwd = getcwd(path, sizeof path)) == NULL) {
283: if ((cwd = find_home()) == NULL)
284: cwd = "/";
285: }
286: if ((ttynam = ttyname(STDIN_FILENO)) == NULL)
287: ttynam = "";
288:
289: /*
290: * Drop privileges for client. "proc exec" is needed for -c and for
291: * locking (which uses system(3)).
292: *
293: * "tty" is needed to restore termios(4) and also for some reason -CC
294: * does not work properly without it (input is not recognised).
295: *
296: * "sendfd" is dropped later in client_dispatch_wait().
297: */
298: if (pledge("stdio unix sendfd proc exec tty", NULL) != 0)
299: fatal("pledge failed");
300:
301: /* Free stuff that is not used in the client. */
302: if (ptm_fd != -1)
303: close(ptm_fd);
304: options_free(global_options);
305: options_free(global_s_options);
306: options_free(global_w_options);
307: environ_free(global_environ);
308:
309: /* Create stdin handler. */
310: setblocking(STDIN_FILENO, 0);
311: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
312: client_stdin_callback, NULL);
313: if (client_flags & CLIENT_CONTROLCONTROL) {
314: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
315: fprintf(stderr, "tcgetattr failed: %s\n",
316: strerror(errno));
317: return (1);
318: }
319: cfmakeraw(&tio);
320: tio.c_iflag = ICRNL|IXANY;
321: tio.c_oflag = OPOST|ONLCR;
322: #ifdef NOKERNINFO
323: tio.c_lflag = NOKERNINFO;
324: #endif
325: tio.c_cflag = CREAD|CS8|HUPCL;
326: tio.c_cc[VMIN] = 1;
327: tio.c_cc[VTIME] = 0;
328: cfsetispeed(&tio, cfgetispeed(&saved_tio));
329: cfsetospeed(&tio, cfgetospeed(&saved_tio));
330: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
331: }
332:
333: /* Send identify messages. */
334: client_send_identify(ttynam, cwd);
335:
336: /* Send first command. */
337: if (msg == MSG_COMMAND) {
338: /* How big is the command? */
339: size = 0;
340: for (i = 0; i < argc; i++)
341: size += strlen(argv[i]) + 1;
342: data = xmalloc((sizeof *data) + size);
343:
344: /* Prepare command for server. */
345: data->argc = argc;
346: if (cmd_pack_argv(argc, argv, (char *)(data + 1), size) != 0) {
347: fprintf(stderr, "command too long\n");
348: free(data);
349: return (1);
350: }
351: size += sizeof *data;
352:
353: /* Send the command. */
354: if (proc_send(client_peer, msg, -1, data, size) != 0) {
355: fprintf(stderr, "failed to send command\n");
356: free(data);
357: return (1);
358: }
359: free(data);
360: } else if (msg == MSG_SHELL)
361: proc_send(client_peer, msg, -1, NULL, 0);
362:
363: /* Start main loop. */
364: proc_loop(client_proc, NULL);
365:
366: /* Run command if user requested exec, instead of exiting. */
367: if (client_exittype == MSG_EXEC) {
368: if (client_flags & CLIENT_CONTROLCONTROL)
369: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
370: clear_signals(0);
371: client_exec(client_execshell, client_execcmd);
372: }
373:
374: /* Print the exit message, if any, and exit. */
375: if (client_attached) {
376: if (client_exitreason != CLIENT_EXIT_NONE)
377: printf("[%s]\n", client_exit_message());
378:
379: ppid = getppid();
380: if (client_exittype == MSG_DETACHKILL && ppid > 1)
381: kill(ppid, SIGHUP);
382: } else if (client_flags & CLIENT_CONTROLCONTROL) {
383: if (client_exitreason != CLIENT_EXIT_NONE)
384: printf("%%exit %s\n", client_exit_message());
385: else
386: printf("%%exit\n");
387: printf("\033\\");
388: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
389: } else if (client_exitreason != CLIENT_EXIT_NONE)
390: fprintf(stderr, "%s\n", client_exit_message());
391: setblocking(STDIN_FILENO, 1);
392: return (client_exitval);
393: }
394:
395: /* Send identify messages to server. */
396: static void
397: client_send_identify(const char *ttynam, const char *cwd)
398: {
399: const char *s;
400: char **ss;
401: size_t sslen;
402: int fd, flags = client_flags;
403: pid_t pid;
404:
405: proc_send(client_peer, MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
406:
407: if ((s = getenv("TERM")) == NULL)
408: s = "";
409: proc_send(client_peer, MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
410:
411: proc_send(client_peer, MSG_IDENTIFY_TTYNAME, -1, ttynam,
412: strlen(ttynam) + 1);
413: proc_send(client_peer, MSG_IDENTIFY_CWD, -1, cwd, strlen(cwd) + 1);
414:
415: if ((fd = dup(STDIN_FILENO)) == -1)
416: fatal("dup failed");
417: proc_send(client_peer, MSG_IDENTIFY_STDIN, fd, NULL, 0);
418:
419: pid = getpid();
420: proc_send(client_peer, MSG_IDENTIFY_CLIENTPID, -1, &pid, sizeof pid);
421:
422: for (ss = environ; *ss != NULL; ss++) {
423: sslen = strlen(*ss) + 1;
424: if (sslen > MAX_IMSGSIZE - IMSG_HEADER_SIZE)
425: continue;
426: proc_send(client_peer, MSG_IDENTIFY_ENVIRON, -1, *ss, sslen);
427: }
428:
429: proc_send(client_peer, MSG_IDENTIFY_DONE, -1, NULL, 0);
430: }
431:
432: /* Callback for client stdin read events. */
433: static void
434: client_stdin_callback(__unused int fd, __unused short events,
435: __unused void *arg)
436: {
437: struct msg_stdin_data data;
438:
439: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
440: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
441: return;
442:
443: proc_send(client_peer, MSG_STDIN, -1, &data, sizeof data);
444: if (data.size <= 0)
445: event_del(&client_stdin);
446: }
447:
448: /* Force write to file descriptor. */
449: static void
450: client_write(int fd, const char *data, size_t size)
451: {
452: ssize_t used;
453:
454: while (size != 0) {
455: used = write(fd, data, size);
456: if (used == -1) {
457: if (errno == EINTR || errno == EAGAIN)
458: continue;
459: break;
460: }
461: data += used;
462: size -= used;
463: }
464: }
465:
466: /* Run command in shell; used for -c. */
467: static __dead void
468: client_exec(const char *shell, const char *shellcmd)
469: {
470: const char *name, *ptr;
471: char *argv0;
472:
473: log_debug("shell %s, command %s", shell, shellcmd);
474:
475: ptr = strrchr(shell, '/');
476: if (ptr != NULL && *(ptr + 1) != '\0')
477: name = ptr + 1;
478: else
479: name = shell;
480: if (client_flags & CLIENT_LOGIN)
481: xasprintf(&argv0, "-%s", name);
482: else
483: xasprintf(&argv0, "%s", name);
484: setenv("SHELL", shell, 1);
485:
486: setblocking(STDIN_FILENO, 1);
487: setblocking(STDOUT_FILENO, 1);
488: setblocking(STDERR_FILENO, 1);
489: closefrom(STDERR_FILENO + 1);
490:
491: execl(shell, argv0, "-c", shellcmd, (char *) NULL);
492: fatal("execl failed");
493: }
494:
495: /* Callback to handle signals in the client. */
496: static void
497: client_signal(int sig)
498: {
499: struct sigaction sigact;
500: int status;
501:
502: if (sig == SIGCHLD)
503: waitpid(WAIT_ANY, &status, WNOHANG);
504: else if (!client_attached) {
505: if (sig == SIGTERM)
506: proc_exit(client_proc);
507: } else {
508: switch (sig) {
509: case SIGHUP:
510: client_exitreason = CLIENT_EXIT_LOST_TTY;
511: client_exitval = 1;
512: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
513: break;
514: case SIGTERM:
515: client_exitreason = CLIENT_EXIT_TERMINATED;
516: client_exitval = 1;
517: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
518: break;
519: case SIGWINCH:
520: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
521: break;
522: case SIGCONT:
523: memset(&sigact, 0, sizeof sigact);
524: sigemptyset(&sigact.sa_mask);
525: sigact.sa_flags = SA_RESTART;
526: sigact.sa_handler = SIG_IGN;
527: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
528: fatal("sigaction failed");
529: proc_send(client_peer, MSG_WAKEUP, -1, NULL, 0);
530: break;
531: }
532: }
533: }
534:
535: /* Callback for client read events. */
536: static void
537: client_dispatch(struct imsg *imsg, void *arg)
538: {
539: if (imsg == NULL) {
540: client_exitreason = CLIENT_EXIT_LOST_SERVER;
541: client_exitval = 1;
542: proc_exit(client_proc);
543: return;
544: }
545:
546: if (client_attached)
547: client_dispatch_attached(imsg);
548: else
549: client_dispatch_wait(imsg, arg);
550: }
551:
552: /* Dispatch imsgs when in wait state (before MSG_READY). */
553: static void
554: client_dispatch_wait(struct imsg *imsg, const char *shellcmd)
555: {
556: char *data;
557: ssize_t datalen;
558: struct msg_stdout_data stdoutdata;
559: struct msg_stderr_data stderrdata;
560: int retval;
561: static int pledge_applied;
562:
563: /*
564: * "sendfd" is no longer required once all of the identify messages
565: * have been sent. We know the server won't send us anything until that
566: * point (because we don't ask it to), so we can drop "sendfd" once we
567: * get the first message from the server.
568: */
569: if (!pledge_applied) {
570: if (pledge("stdio unix proc exec tty", NULL) != 0)
571: fatal("pledge failed");
572: pledge_applied = 1;
573: };
574:
575: data = imsg->data;
576: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
577:
578: switch (imsg->hdr.type) {
579: case MSG_EXIT:
580: case MSG_SHUTDOWN:
581: if (datalen != sizeof retval && datalen != 0)
582: fatalx("bad MSG_EXIT size");
583: if (datalen == sizeof retval) {
584: memcpy(&retval, data, sizeof retval);
585: client_exitval = retval;
586: }
587: proc_exit(client_proc);
588: break;
589: case MSG_READY:
590: if (datalen != 0)
591: fatalx("bad MSG_READY size");
592:
593: event_del(&client_stdin);
594: client_attached = 1;
595: proc_send(client_peer, MSG_RESIZE, -1, NULL, 0);
596: break;
597: case MSG_STDIN:
598: if (datalen != 0)
599: fatalx("bad MSG_STDIN size");
600:
601: event_add(&client_stdin, NULL);
602: break;
603: case MSG_STDOUT:
604: if (datalen != sizeof stdoutdata)
605: fatalx("bad MSG_STDOUT size");
606: memcpy(&stdoutdata, data, sizeof stdoutdata);
607:
608: client_write(STDOUT_FILENO, stdoutdata.data,
609: stdoutdata.size);
610: break;
611: case MSG_STDERR:
612: if (datalen != sizeof stderrdata)
613: fatalx("bad MSG_STDERR size");
614: memcpy(&stderrdata, data, sizeof stderrdata);
615:
616: client_write(STDERR_FILENO, stderrdata.data,
617: stderrdata.size);
618: break;
619: case MSG_VERSION:
620: if (datalen != 0)
621: fatalx("bad MSG_VERSION size");
622:
623: fprintf(stderr, "protocol version mismatch "
624: "(client %d, server %u)\n", PROTOCOL_VERSION,
625: imsg->hdr.peerid & 0xff);
626: client_exitval = 1;
627: proc_exit(client_proc);
628: break;
629: case MSG_SHELL:
630: if (datalen == 0 || data[datalen - 1] != '\0')
631: fatalx("bad MSG_SHELL string");
632:
633: clear_signals(0);
634: client_exec(data, shellcmd);
635: /* NOTREACHED */
636: case MSG_DETACH:
637: case MSG_DETACHKILL:
638: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
639: break;
640: case MSG_EXITED:
641: proc_exit(client_proc);
642: break;
643: }
644: }
645:
646: /* Dispatch imsgs in attached state (after MSG_READY). */
647: static void
648: client_dispatch_attached(struct imsg *imsg)
649: {
650: struct sigaction sigact;
651: char *data;
652: ssize_t datalen;
653:
654: data = imsg->data;
655: datalen = imsg->hdr.len - IMSG_HEADER_SIZE;
656:
657: switch (imsg->hdr.type) {
658: case MSG_DETACH:
659: case MSG_DETACHKILL:
660: if (datalen == 0 || data[datalen - 1] != '\0')
661: fatalx("bad MSG_DETACH string");
662:
663: client_exitsession = xstrdup(data);
664: client_exittype = imsg->hdr.type;
665: if (imsg->hdr.type == MSG_DETACHKILL)
666: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
667: else
668: client_exitreason = CLIENT_EXIT_DETACHED;
669: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
670: break;
671: case MSG_EXEC:
672: if (datalen == 0 || data[datalen - 1] != '\0' ||
673: strlen(data) + 1 == (size_t)datalen)
674: fatalx("bad MSG_EXEC string");
675: client_execcmd = xstrdup(data);
676: client_execshell = xstrdup(data + strlen(data) + 1);
677:
678: client_exittype = imsg->hdr.type;
679: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
680: break;
681: case MSG_EXIT:
682: if (datalen != 0 && datalen != sizeof (int))
683: fatalx("bad MSG_EXIT size");
684:
685: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
686: client_exitreason = CLIENT_EXIT_EXITED;
687: break;
688: case MSG_EXITED:
689: if (datalen != 0)
690: fatalx("bad MSG_EXITED size");
691:
692: proc_exit(client_proc);
693: break;
694: case MSG_SHUTDOWN:
695: if (datalen != 0)
696: fatalx("bad MSG_SHUTDOWN size");
697:
698: proc_send(client_peer, MSG_EXITING, -1, NULL, 0);
699: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
700: client_exitval = 1;
701: break;
702: case MSG_SUSPEND:
703: if (datalen != 0)
704: fatalx("bad MSG_SUSPEND size");
705:
706: memset(&sigact, 0, sizeof sigact);
707: sigemptyset(&sigact.sa_mask);
708: sigact.sa_flags = SA_RESTART;
709: sigact.sa_handler = SIG_DFL;
710: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
711: fatal("sigaction failed");
712: kill(getpid(), SIGTSTP);
713: break;
714: case MSG_LOCK:
715: if (datalen == 0 || data[datalen - 1] != '\0')
716: fatalx("bad MSG_LOCK string");
717:
718: system(data);
719: proc_send(client_peer, MSG_UNLOCK, -1, NULL, 0);
720: break;
721: }
722: }
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