Annotation of src/usr.bin/tmux/client.c, Revision 1.81
1.81 ! krw 1: /* $OpenBSD: client.c,v 1.80 2014/04/29 22:31:22 nicm Exp $ */
1.1 nicm 2:
3: /*
4: * Copyright (c) 2007 Nicholas Marriott <nicm@users.sourceforge.net>
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>
1.51 nicm 20: #include <sys/file.h>
1.1 nicm 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>
1.30 nicm 27: #include <event.h>
1.80 nicm 28: #include <fcntl.h>
1.1 nicm 29: #include <stdlib.h>
30: #include <string.h>
31: #include <unistd.h>
32:
33: #include "tmux.h"
34:
1.25 nicm 35: struct imsgbuf client_ibuf;
1.30 nicm 36: struct event client_event;
1.54 nicm 37: struct event client_stdin;
1.52 nicm 38: enum {
39: CLIENT_EXIT_NONE,
40: CLIENT_EXIT_DETACHED,
41: CLIENT_EXIT_DETACHED_HUP,
42: CLIENT_EXIT_LOST_TTY,
43: CLIENT_EXIT_TERMINATED,
44: CLIENT_EXIT_LOST_SERVER,
45: CLIENT_EXIT_EXITED,
46: CLIENT_EXIT_SERVER_EXITED,
47: } client_exitreason = CLIENT_EXIT_NONE;
1.32 nicm 48: int client_exitval;
1.48 nicm 49: enum msgtype client_exittype;
1.73 nicm 50: const char *client_exitsession;
1.46 nicm 51: int client_attached;
1.1 nicm 52:
1.49 nicm 53: int client_get_lock(char *);
1.46 nicm 54: int client_connect(char *, int);
1.30 nicm 55: void client_send_identify(int);
1.70 nicm 56: int client_write_one(enum msgtype, int, const void *, size_t);
57: int client_write_server(enum msgtype, const void *, size_t);
1.31 nicm 58: void client_update_event(void);
1.30 nicm 59: void client_signal(int, short, void *);
1.54 nicm 60: void client_stdin_callback(int, short, void *);
1.57 nicm 61: void client_write(int, const char *, size_t);
1.30 nicm 62: void client_callback(int, short, void *);
1.46 nicm 63: int client_dispatch_attached(void);
64: int client_dispatch_wait(void *);
1.53 nicm 65: const char *client_exit_message(void);
1.25 nicm 66:
1.49 nicm 67: /*
68: * Get server create lock. If already held then server start is happening in
69: * another client, so block until the lock is released and return -1 to
70: * retry. Ignore other errors - just continue and start the server without the
71: * lock.
72: */
73: int
74: client_get_lock(char *lockfile)
75: {
76: int lockfd;
77:
78: if ((lockfd = open(lockfile, O_WRONLY|O_CREAT, 0600)) == -1)
79: fatal("open failed");
80:
1.66 nicm 81: if (lockf(lockfd, F_TLOCK, 0) == -1 && errno == EAGAIN) {
82: while (lockf(lockfd, F_LOCK, 0) == -1 && errno == EINTR)
1.49 nicm 83: /* nothing */;
84: close(lockfd);
85: return (-1);
86: }
87:
88: return (lockfd);
89: }
90:
1.46 nicm 91: /* Connect client to server. */
92: int
93: client_connect(char *path, int start_server)
1.1 nicm 94: {
1.26 nicm 95: struct sockaddr_un sa;
96: size_t size;
1.49 nicm 97: int fd, lockfd;
98: char *lockfile;
1.1 nicm 99:
100: memset(&sa, 0, sizeof sa);
101: sa.sun_family = AF_UNIX;
102: size = strlcpy(sa.sun_path, path, sizeof sa.sun_path);
103: if (size >= sizeof sa.sun_path) {
104: errno = ENAMETOOLONG;
1.46 nicm 105: return (-1);
1.1 nicm 106: }
107:
1.49 nicm 108: retry:
1.10 nicm 109: if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1)
1.18 nicm 110: fatal("socket failed");
1.1 nicm 111:
1.10 nicm 112: if (connect(fd, (struct sockaddr *) &sa, SUN_LEN(&sa)) == -1) {
1.49 nicm 113: if (errno != ECONNREFUSED && errno != ENOENT)
114: goto failed;
1.46 nicm 115: if (!start_server)
116: goto failed;
1.49 nicm 117: close(fd);
118:
119: xasprintf(&lockfile, "%s.lock", path);
1.78 nicm 120: if ((lockfd = client_get_lock(lockfile)) == -1) {
121: free(lockfile);
1.49 nicm 122: goto retry;
1.78 nicm 123: }
124: if (unlink(path) != 0 && errno != ENOENT) {
125: free(lockfile);
126: close(lockfd);
1.49 nicm 127: return (-1);
1.78 nicm 128: }
1.49 nicm 129: fd = server_start(lockfd, lockfile);
1.58 nicm 130: free(lockfile);
1.49 nicm 131: close(lockfd);
1.1 nicm 132: }
133:
1.47 nicm 134: setblocking(fd, 0);
1.46 nicm 135: return (fd);
136:
137: failed:
138: close(fd);
139: return (-1);
140: }
141:
1.52 nicm 142: /* Get exit string from reason number. */
143: const char *
144: client_exit_message(void)
145: {
1.73 nicm 146: static char msg[256];
147:
1.52 nicm 148: switch (client_exitreason) {
149: case CLIENT_EXIT_NONE:
150: break;
151: case CLIENT_EXIT_DETACHED:
1.73 nicm 152: if (client_exitsession != NULL) {
153: xsnprintf(msg, sizeof msg, "detached "
154: "(from session %s)", client_exitsession);
155: return (msg);
156: }
1.52 nicm 157: return ("detached");
158: case CLIENT_EXIT_DETACHED_HUP:
1.73 nicm 159: if (client_exitsession != NULL) {
160: xsnprintf(msg, sizeof msg, "detached and SIGHUP "
161: "(from session %s)", client_exitsession);
162: return (msg);
163: }
1.52 nicm 164: return ("detached and SIGHUP");
165: case CLIENT_EXIT_LOST_TTY:
166: return ("lost tty");
167: case CLIENT_EXIT_TERMINATED:
168: return ("terminated");
169: case CLIENT_EXIT_LOST_SERVER:
170: return ("lost server");
171: case CLIENT_EXIT_EXITED:
172: return ("exited");
173: case CLIENT_EXIT_SERVER_EXITED:
174: return ("server exited");
175: }
176: return ("unknown reason");
177: }
178:
1.46 nicm 179: /* Client main loop. */
180: int
181: client_main(int argc, char **argv, int flags)
182: {
183: struct cmd *cmd;
184: struct cmd_list *cmdlist;
1.70 nicm 185: struct msg_command_data *data;
186: int cmdflags, fd, i;
1.48 nicm 187: pid_t ppid;
1.46 nicm 188: enum msgtype msg;
189: char *cause;
1.56 nicm 190: struct termios tio, saved_tio;
1.70 nicm 191: size_t size;
1.46 nicm 192:
193: /* Set up the initial command. */
194: cmdflags = 0;
195: if (shell_cmd != NULL) {
196: msg = MSG_SHELL;
197: cmdflags = CMD_STARTSERVER;
198: } else if (argc == 0) {
199: msg = MSG_COMMAND;
1.67 nicm 200: cmdflags = CMD_STARTSERVER|CMD_CANTNEST;
1.46 nicm 201: } else {
202: msg = MSG_COMMAND;
203:
204: /*
205: * It sucks parsing the command string twice (in client and
206: * later in server) but it is necessary to get the start server
207: * flag.
208: */
1.62 nicm 209: cmdlist = cmd_list_parse(argc, argv, NULL, 0, &cause);
210: if (cmdlist == NULL) {
1.59 nicm 211: fprintf(stderr, "%s\n", cause);
1.46 nicm 212: return (1);
213: }
214: cmdflags &= ~CMD_STARTSERVER;
215: TAILQ_FOREACH(cmd, &cmdlist->list, qentry) {
216: if (cmd->entry->flags & CMD_STARTSERVER)
217: cmdflags |= CMD_STARTSERVER;
218: if (cmd->entry->flags & CMD_CANTNEST)
219: cmdflags |= CMD_CANTNEST;
220: }
221: cmd_list_free(cmdlist);
222: }
223:
224: /*
225: * Check if this could be a nested session, if the command can't nest:
226: * if the socket path matches $TMUX, this is probably the same server.
227: */
228: if (shell_cmd == NULL && environ_path != NULL &&
1.52 nicm 229: (cmdflags & CMD_CANTNEST) &&
230: strcmp(socket_path, environ_path) == 0) {
1.55 nicm 231: fprintf(stderr, "sessions should be nested with care, "
232: "unset $TMUX to force\n");
1.46 nicm 233: return (1);
234: }
235:
236: /* Initialise the client socket and start the server. */
237: fd = client_connect(socket_path, cmdflags & CMD_STARTSERVER);
238: if (fd == -1) {
1.77 nicm 239: fprintf(stderr, "failed to connect to server: %s\n",
240: strerror(errno));
1.46 nicm 241: return (1);
242: }
243:
244: /* Set process title, log and signals now this is the client. */
245: setproctitle("client (%s)", socket_path);
246: logfile("client");
247:
248: /* Create imsg. */
1.25 nicm 249: imsg_init(&client_ibuf, fd);
1.46 nicm 250: event_set(&client_event, fd, EV_READ, client_callback, shell_cmd);
251:
1.54 nicm 252: /* Create stdin handler. */
253: setblocking(STDIN_FILENO, 0);
254: event_set(&client_stdin, STDIN_FILENO, EV_READ|EV_PERSIST,
255: client_stdin_callback, NULL);
1.68 nicm 256: if (flags & CLIENT_CONTROLCONTROL) {
1.56 nicm 257: if (tcgetattr(STDIN_FILENO, &saved_tio) != 0) {
258: fprintf(stderr, "tcgetattr failed: %s\n",
259: strerror(errno));
260: return (1);
261: }
262: cfmakeraw(&tio);
263: tio.c_iflag = ICRNL|IXANY;
264: tio.c_oflag = OPOST|ONLCR;
265: tio.c_lflag = NOKERNINFO;
266: tio.c_cflag = CREAD|CS8|HUPCL;
267: tio.c_cc[VMIN] = 1;
268: tio.c_cc[VTIME] = 0;
269: cfsetispeed(&tio, cfgetispeed(&saved_tio));
270: cfsetospeed(&tio, cfgetospeed(&saved_tio));
271: tcsetattr(STDIN_FILENO, TCSANOW, &tio);
272: }
1.54 nicm 273:
1.46 nicm 274: /* Establish signal handlers. */
275: set_signals(client_signal);
1.1 nicm 276:
1.71 nicm 277: /* Send identify messages. */
1.42 nicm 278: client_send_identify(flags);
1.1 nicm 279:
1.46 nicm 280: /* Send first command. */
281: if (msg == MSG_COMMAND) {
1.70 nicm 282: /* How big is the command? */
283: size = 0;
284: for (i = 0; i < argc; i++)
285: size += strlen(argv[i]) + 1;
286: data = xmalloc((sizeof *data) + size);
1.46 nicm 287:
288: /* Prepare command for server. */
1.70 nicm 289: data->argc = argc;
290: if (cmd_pack_argv(argc, argv, (char*)(data + 1), size) != 0) {
1.55 nicm 291: fprintf(stderr, "command too long\n");
1.70 nicm 292: free(data);
1.46 nicm 293: return (1);
294: }
1.70 nicm 295: size += sizeof *data;
1.46 nicm 296:
1.70 nicm 297: /* Send the command. */
298: if (client_write_server(msg, data, size) != 0) {
299: fprintf(stderr, "failed to send command\n");
300: free(data);
301: return (1);
302: }
303: free(data);
1.46 nicm 304: } else if (msg == MSG_SHELL)
305: client_write_server(msg, NULL, 0);
1.1 nicm 306:
1.46 nicm 307: /* Set the event and dispatch. */
308: client_update_event();
309: event_dispatch();
310:
311: /* Print the exit message, if any, and exit. */
1.48 nicm 312: if (client_attached) {
1.52 nicm 313: if (client_exitreason != CLIENT_EXIT_NONE && !login_shell)
314: printf("[%s]\n", client_exit_message());
1.48 nicm 315:
316: ppid = getppid();
317: if (client_exittype == MSG_DETACHKILL && ppid > 1)
318: kill(ppid, SIGHUP);
1.68 nicm 319: } else if (flags & CLIENT_CONTROLCONTROL) {
320: if (client_exitreason != CLIENT_EXIT_NONE)
321: printf("%%exit %s\n", client_exit_message());
322: else
323: printf("%%exit\n");
324: printf("\033\\");
1.56 nicm 325: tcsetattr(STDOUT_FILENO, TCSAFLUSH, &saved_tio);
1.63 nicm 326: }
1.54 nicm 327: setblocking(STDIN_FILENO, 1);
1.46 nicm 328: return (client_exitval);
1.1 nicm 329: }
330:
1.71 nicm 331: /* Send identify messages to server. */
1.11 nicm 332: void
1.26 nicm 333: client_send_identify(int flags)
334: {
1.71 nicm 335: const char *s;
336: char **ss;
337: int fd;
338:
339: client_write_one(MSG_IDENTIFY_FLAGS, -1, &flags, sizeof flags);
340:
341: if ((s = getenv("TERM")) == NULL)
342: s = "";
343: client_write_one(MSG_IDENTIFY_TERM, -1, s, strlen(s) + 1);
344:
345: if ((s = ttyname(STDIN_FILENO)) == NULL)
346: s = "";
347: client_write_one(MSG_IDENTIFY_TTYNAME, -1, s, strlen(s) + 1);
348:
349: if ((fd = open(".", O_RDONLY)) == -1)
350: fd = open("/", O_RDONLY);
351: client_write_one(MSG_IDENTIFY_CWD, fd, NULL, 0);
1.26 nicm 352:
1.50 nicm 353: if ((fd = dup(STDIN_FILENO)) == -1)
354: fatal("dup failed");
1.71 nicm 355: client_write_one(MSG_IDENTIFY_STDIN, fd, NULL, 0);
1.26 nicm 356:
1.71 nicm 357: for (ss = environ; *ss != NULL; ss++)
358: client_write_one(MSG_IDENTIFY_ENVIRON, -1, *ss, strlen(*ss) + 1);
1.75 nicm 359:
1.71 nicm 360: client_write_one(MSG_IDENTIFY_DONE, -1, NULL, 0);
1.11 nicm 361:
1.71 nicm 362: client_update_event();
1.11 nicm 363: }
364:
1.70 nicm 365: /* Helper to send one message. */
366: int
367: client_write_one(enum msgtype type, int fd, const void *buf, size_t len)
368: {
369: int retval;
370:
371: retval = imsg_compose(&client_ibuf, type, PROTOCOL_VERSION, -1, fd,
372: (void*)buf, len);
373: if (retval != 1)
374: return (-1);
375: return (0);
376: }
377:
1.46 nicm 378: /* Write a message to the server without a file descriptor. */
1.70 nicm 379: int
380: client_write_server(enum msgtype type, const void *buf, size_t len)
1.25 nicm 381: {
1.70 nicm 382: int retval;
383:
384: retval = client_write_one(type, -1, buf, len);
385: if (retval == 0)
386: client_update_event();
387: return (retval);
1.25 nicm 388: }
389:
1.46 nicm 390: /* Update client event based on whether it needs to read or read and write. */
1.31 nicm 391: void
392: client_update_event(void)
393: {
394: short events;
395:
396: event_del(&client_event);
397: events = EV_READ;
398: if (client_ibuf.w.queued > 0)
399: events |= EV_WRITE;
1.46 nicm 400: event_set(
401: &client_event, client_ibuf.fd, events, client_callback, shell_cmd);
1.31 nicm 402: event_add(&client_event, NULL);
403: }
404:
1.46 nicm 405: /* Callback to handle signals in the client. */
1.30 nicm 406: void
1.31 nicm 407: client_signal(int sig, unused short events, unused void *data)
1.30 nicm 408: {
1.46 nicm 409: struct sigaction sigact;
410: int status;
1.30 nicm 411:
1.46 nicm 412: if (!client_attached) {
413: switch (sig) {
414: case SIGCHLD:
415: waitpid(WAIT_ANY, &status, WNOHANG);
416: break;
417: case SIGTERM:
418: event_loopexit(NULL);
419: break;
420: }
421: } else {
422: switch (sig) {
423: case SIGHUP:
1.52 nicm 424: client_exitreason = CLIENT_EXIT_LOST_TTY;
1.46 nicm 425: client_exitval = 1;
426: client_write_server(MSG_EXITING, NULL, 0);
427: break;
428: case SIGTERM:
1.52 nicm 429: client_exitreason = CLIENT_EXIT_TERMINATED;
1.46 nicm 430: client_exitval = 1;
431: client_write_server(MSG_EXITING, NULL, 0);
432: break;
433: case SIGWINCH:
434: client_write_server(MSG_RESIZE, NULL, 0);
435: break;
436: case SIGCONT:
437: memset(&sigact, 0, sizeof sigact);
438: sigemptyset(&sigact.sa_mask);
439: sigact.sa_flags = SA_RESTART;
440: sigact.sa_handler = SIG_IGN;
441: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
442: fatal("sigaction failed");
443: client_write_server(MSG_WAKEUP, NULL, 0);
444: break;
445: }
1.30 nicm 446: }
447:
1.31 nicm 448: client_update_event();
1.30 nicm 449: }
450:
1.46 nicm 451: /* Callback for client imsg read events. */
1.30 nicm 452: void
1.46 nicm 453: client_callback(unused int fd, short events, void *data)
1.30 nicm 454: {
1.33 nicm 455: ssize_t n;
1.46 nicm 456: int retval;
1.30 nicm 457:
458: if (events & EV_READ) {
459: if ((n = imsg_read(&client_ibuf)) == -1 || n == 0)
460: goto lost_server;
1.46 nicm 461: if (client_attached)
462: retval = client_dispatch_attached();
463: else
464: retval = client_dispatch_wait(data);
465: if (retval != 0) {
1.30 nicm 466: event_loopexit(NULL);
467: return;
1.35 nicm 468: }
1.30 nicm 469: }
1.35 nicm 470:
1.30 nicm 471: if (events & EV_WRITE) {
1.81 ! krw 472: if (msgbuf_write(&client_ibuf.w) <= 0 && errno != EAGAIN)
1.30 nicm 473: goto lost_server;
474: }
475:
1.31 nicm 476: client_update_event();
1.30 nicm 477: return;
478:
479: lost_server:
1.52 nicm 480: client_exitreason = CLIENT_EXIT_LOST_SERVER;
1.32 nicm 481: client_exitval = 1;
1.30 nicm 482: event_loopexit(NULL);
483: }
484:
1.54 nicm 485: /* Callback for client stdin read events. */
486: void
487: client_stdin_callback(unused int fd, unused short events, unused void *data1)
488: {
489: struct msg_stdin_data data;
490:
491: data.size = read(STDIN_FILENO, data.data, sizeof data.data);
492: if (data.size < 0 && (errno == EINTR || errno == EAGAIN))
493: return;
494:
495: client_write_server(MSG_STDIN, &data, sizeof data);
496: if (data.size <= 0)
497: event_del(&client_stdin);
498: client_update_event();
499: }
500:
1.57 nicm 501: /* Force write to file descriptor. */
502: void
503: client_write(int fd, const char *data, size_t size)
504: {
505: ssize_t used;
506:
507: while (size != 0) {
508: used = write(fd, data, size);
509: if (used == -1) {
510: if (errno == EINTR || errno == EAGAIN)
511: continue;
512: break;
513: }
514: data += used;
515: size -= used;
516: }
517: }
518:
1.46 nicm 519: /* Dispatch imsgs when in wait state (before MSG_READY). */
520: int
1.69 nicm 521: client_dispatch_wait(void *data0)
1.46 nicm 522: {
1.69 nicm 523: struct imsg imsg;
524: char *data;
525: ssize_t n, datalen;
526: struct msg_stdout_data stdoutdata;
527: struct msg_stderr_data stderrdata;
528: int retval;
1.46 nicm 529:
530: for (;;) {
531: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
532: fatalx("imsg_get failed");
533: if (n == 0)
534: return (0);
1.69 nicm 535:
536: data = imsg.data;
1.46 nicm 537: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
538:
1.54 nicm 539: log_debug("got %d from server", imsg.hdr.type);
1.46 nicm 540: switch (imsg.hdr.type) {
541: case MSG_EXIT:
542: case MSG_SHUTDOWN:
1.69 nicm 543: if (datalen != sizeof retval && datalen != 0)
544: fatalx("bad MSG_EXIT size");
545: if (datalen == sizeof retval) {
546: memcpy(&retval, data, sizeof retval);
547: client_exitval = retval;
1.46 nicm 548: }
549: imsg_free(&imsg);
550: return (-1);
551: case MSG_READY:
552: if (datalen != 0)
553: fatalx("bad MSG_READY size");
554:
1.54 nicm 555: event_del(&client_stdin);
1.46 nicm 556: client_attached = 1;
1.65 nicm 557: client_write_server(MSG_RESIZE, NULL, 0);
1.60 nicm 558: break;
559: case MSG_STDIN:
560: if (datalen != 0)
561: fatalx("bad MSG_STDIN size");
562:
563: event_add(&client_stdin, NULL);
1.46 nicm 564: break;
1.54 nicm 565: case MSG_STDOUT:
566: if (datalen != sizeof stdoutdata)
1.69 nicm 567: fatalx("bad MSG_STDOUT size");
568: memcpy(&stdoutdata, data, sizeof stdoutdata);
1.54 nicm 569:
1.70 nicm 570: client_write(STDOUT_FILENO, stdoutdata.data,
571: stdoutdata.size);
1.54 nicm 572: break;
573: case MSG_STDERR:
574: if (datalen != sizeof stderrdata)
1.69 nicm 575: fatalx("bad MSG_STDERR size");
576: memcpy(&stderrdata, data, sizeof stderrdata);
1.54 nicm 577:
1.70 nicm 578: client_write(STDERR_FILENO, stderrdata.data,
579: stderrdata.size);
1.54 nicm 580: break;
1.46 nicm 581: case MSG_VERSION:
582: if (datalen != 0)
583: fatalx("bad MSG_VERSION size");
584:
1.54 nicm 585: fprintf(stderr, "protocol version mismatch "
586: "(client %u, server %u)\n", PROTOCOL_VERSION,
587: imsg.hdr.peerid);
1.46 nicm 588: client_exitval = 1;
589:
590: imsg_free(&imsg);
591: return (-1);
592: case MSG_SHELL:
1.72 nicm 593: if (datalen == 0 || data[datalen - 1] != '\0')
1.69 nicm 594: fatalx("bad MSG_SHELL string");
1.46 nicm 595:
596: clear_signals(0);
1.69 nicm 597: shell_exec(data, data0);
1.46 nicm 598: /* NOTREACHED */
1.56 nicm 599: case MSG_DETACH:
1.73 nicm 600: case MSG_DETACHKILL:
1.56 nicm 601: client_write_server(MSG_EXITING, NULL, 0);
602: break;
603: case MSG_EXITED:
604: imsg_free(&imsg);
605: return (-1);
1.46 nicm 606: }
607:
608: imsg_free(&imsg);
609: }
610: }
611:
612: /* Dispatch imsgs in attached state (after MSG_READY). */
1.9 nicm 613: int
1.46 nicm 614: client_dispatch_attached(void)
1.9 nicm 615: {
1.69 nicm 616: struct imsg imsg;
617: struct sigaction sigact;
618: char *data;
619: ssize_t n, datalen;
1.9 nicm 620:
621: for (;;) {
1.25 nicm 622: if ((n = imsg_get(&client_ibuf, &imsg)) == -1)
1.12 nicm 623: fatalx("imsg_get failed");
624: if (n == 0)
1.9 nicm 625: return (0);
1.69 nicm 626:
627: data = imsg.data;
1.12 nicm 628: datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
1.9 nicm 629:
1.55 nicm 630: log_debug("got %d from server", imsg.hdr.type);
1.12 nicm 631: switch (imsg.hdr.type) {
1.73 nicm 632: case MSG_DETACH:
1.48 nicm 633: case MSG_DETACHKILL:
1.73 nicm 634: if (datalen == 0 || data[datalen - 1] != '\0')
635: fatalx("bad MSG_DETACH string");
1.9 nicm 636:
1.73 nicm 637: client_exitsession = xstrdup(data);
1.48 nicm 638: client_exittype = imsg.hdr.type;
639: if (imsg.hdr.type == MSG_DETACHKILL)
1.52 nicm 640: client_exitreason = CLIENT_EXIT_DETACHED_HUP;
1.48 nicm 641: else
1.52 nicm 642: client_exitreason = CLIENT_EXIT_DETACHED;
1.25 nicm 643: client_write_server(MSG_EXITING, NULL, 0);
1.9 nicm 644: break;
645: case MSG_EXIT:
1.69 nicm 646: if (datalen != 0 && datalen != sizeof (int))
1.9 nicm 647: fatalx("bad MSG_EXIT size");
1.12 nicm 648:
1.25 nicm 649: client_write_server(MSG_EXITING, NULL, 0);
1.52 nicm 650: client_exitreason = CLIENT_EXIT_EXITED;
1.9 nicm 651: break;
652: case MSG_EXITED:
1.12 nicm 653: if (datalen != 0)
1.9 nicm 654: fatalx("bad MSG_EXITED size");
655:
1.12 nicm 656: imsg_free(&imsg);
1.9 nicm 657: return (-1);
658: case MSG_SHUTDOWN:
1.12 nicm 659: if (datalen != 0)
1.9 nicm 660: fatalx("bad MSG_SHUTDOWN size");
661:
1.25 nicm 662: client_write_server(MSG_EXITING, NULL, 0);
1.52 nicm 663: client_exitreason = CLIENT_EXIT_SERVER_EXITED;
1.32 nicm 664: client_exitval = 1;
1.9 nicm 665: break;
666: case MSG_SUSPEND:
1.12 nicm 667: if (datalen != 0)
1.9 nicm 668: fatalx("bad MSG_SUSPEND size");
669:
1.30 nicm 670: memset(&sigact, 0, sizeof sigact);
671: sigemptyset(&sigact.sa_mask);
672: sigact.sa_flags = SA_RESTART;
673: sigact.sa_handler = SIG_DFL;
674: if (sigaction(SIGTSTP, &sigact, NULL) != 0)
675: fatal("sigaction failed");
676: kill(getpid(), SIGTSTP);
1.21 nicm 677: break;
678: case MSG_LOCK:
1.72 nicm 679: if (datalen == 0 || data[datalen - 1] != '\0')
1.69 nicm 680: fatalx("bad MSG_LOCK string");
1.35 nicm 681:
1.69 nicm 682: system(data);
1.25 nicm 683: client_write_server(MSG_UNLOCK, NULL, 0);
1.9 nicm 684: break;
685: }
1.12 nicm 686:
687: imsg_free(&imsg);
1.9 nicm 688: }
1.1 nicm 689: }
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