Annotation of src/usr.bin/tmux/session.c, Revision 1.48
1.48 ! nicm 1: /* $OpenBSD: session.c,v 1.47 2015/04/22 15:32:33 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>
20: #include <sys/time.h>
21:
1.6 nicm 22: #include <paths.h>
1.1 nicm 23: #include <string.h>
24: #include <stdlib.h>
25: #include <unistd.h>
1.10 nicm 26: #include <time.h>
1.1 nicm 27:
28: #include "tmux.h"
29:
30: /* Global session list. */
31: struct sessions sessions;
1.7 nicm 32: struct sessions dead_sessions;
1.38 nicm 33: u_int next_session_id;
1.11 nicm 34: struct session_groups session_groups;
1.1 nicm 35:
1.18 nicm 36: struct winlink *session_next_alert(struct winlink *);
37: struct winlink *session_previous_alert(struct winlink *);
1.21 nicm 38:
1.25 nicm 39: RB_GENERATE(sessions, session, entry, session_cmp);
40:
41: int
42: session_cmp(struct session *s1, struct session *s2)
43: {
44: return (strcmp(s1->name, s2->name));
45: }
46:
1.21 nicm 47: /*
48: * Find if session is still alive. This is true if it is still on the global
49: * sessions list.
50: */
51: int
52: session_alive(struct session *s)
53: {
1.25 nicm 54: struct session *s_loop;
1.21 nicm 55:
1.25 nicm 56: RB_FOREACH(s_loop, sessions, &sessions) {
57: if (s_loop == s)
58: return (1);
59: }
60: return (0);
1.21 nicm 61: }
1.1 nicm 62:
63: /* Find session by name. */
64: struct session *
65: session_find(const char *name)
66: {
1.25 nicm 67: struct session s;
68:
69: s.name = (char *) name;
70: return (RB_FIND(sessions, &sessions, &s));
1.48 ! nicm 71: }
! 72:
! 73: /* Find session by id parsed from a string. */
! 74: struct session *
! 75: session_find_by_id_str(const char *s)
! 76: {
! 77: const char *errstr;
! 78: u_int id;
! 79:
! 80: if (*s != '$')
! 81: return (NULL);
! 82:
! 83: id = strtonum(s + 1, 0, UINT_MAX, &errstr);
! 84: if (errstr != NULL)
! 85: return (NULL);
! 86: return (session_find_by_id(id));
1.25 nicm 87: }
88:
1.38 nicm 89: /* Find session by id. */
1.25 nicm 90: struct session *
1.38 nicm 91: session_find_by_id(u_int id)
1.25 nicm 92: {
1.1 nicm 93: struct session *s;
94:
1.25 nicm 95: RB_FOREACH(s, sessions, &sessions) {
1.38 nicm 96: if (s->id == id)
1.1 nicm 97: return (s);
98: }
99: return (NULL);
100: }
101:
102: /* Create a new session. */
103: struct session *
1.44 nicm 104: session_create(const char *name, int argc, char **argv, const char *path,
105: int cwd, struct environ *env, struct termios *tio, int idx, u_int sx,
106: u_int sy, char **cause)
1.1 nicm 107: {
108: struct session *s;
1.44 nicm 109: struct winlink *wl;
1.1 nicm 110:
111: s = xmalloc(sizeof *s);
1.7 nicm 112: s->references = 0;
1.1 nicm 113: s->flags = 0;
1.7 nicm 114:
1.12 nicm 115: if (gettimeofday(&s->creation_time, NULL) != 0)
1.9 nicm 116: fatal("gettimeofday failed");
1.27 nicm 117: session_update_activity(s);
1.7 nicm 118:
1.41 nicm 119: s->cwd = dup(cwd);
1.19 nicm 120:
1.1 nicm 121: s->curw = NULL;
1.11 nicm 122: TAILQ_INIT(&s->lastw);
1.1 nicm 123: RB_INIT(&s->windows);
1.7 nicm 124:
1.2 nicm 125: options_init(&s->options, &global_s_options);
1.3 nicm 126: environ_init(&s->environ);
127: if (env != NULL)
128: environ_copy(env, &s->environ);
1.8 nicm 129:
130: s->tio = NULL;
131: if (tio != NULL) {
132: s->tio = xmalloc(sizeof *s->tio);
133: memcpy(s->tio, tio, sizeof *s->tio);
134: }
1.1 nicm 135:
136: s->sx = sx;
137: s->sy = sy;
138:
1.32 nicm 139: if (name != NULL) {
1.1 nicm 140: s->name = xstrdup(name);
1.38 nicm 141: s->id = next_session_id++;
1.32 nicm 142: } else {
143: s->name = NULL;
144: do {
1.38 nicm 145: s->id = next_session_id++;
1.46 nicm 146: free(s->name);
1.38 nicm 147: xasprintf(&s->name, "%u", s->id);
1.32 nicm 148: } while (RB_FIND(sessions, &sessions, s) != NULL);
149: }
1.25 nicm 150: RB_INSERT(sessions, &sessions, s);
1.15 nicm 151:
1.44 nicm 152: if (argc >= 0) {
153: wl = session_new(s, NULL, argc, argv, path, cwd, idx, cause);
154: if (wl == NULL) {
1.11 nicm 155: session_destroy(s);
156: return (NULL);
157: }
158: session_select(s, RB_ROOT(&s->windows)->idx);
1.1 nicm 159: }
160:
161: log_debug("session %s created", s->name);
1.33 nicm 162: notify_session_created(s);
1.1 nicm 163:
164: return (s);
165: }
166:
167: /* Destroy a session. */
168: void
169: session_destroy(struct session *s)
170: {
1.33 nicm 171: struct winlink *wl;
1.39 nicm 172:
1.1 nicm 173: log_debug("session %s destroyed", s->name);
174:
1.25 nicm 175: RB_REMOVE(sessions, &sessions, s);
1.33 nicm 176: notify_session_closed(s);
1.1 nicm 177:
1.36 nicm 178: free(s->tio);
1.8 nicm 179:
1.11 nicm 180: session_group_remove(s);
1.3 nicm 181: environ_free(&s->environ);
1.1 nicm 182: options_free(&s->options);
183:
1.11 nicm 184: while (!TAILQ_EMPTY(&s->lastw))
185: winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
1.33 nicm 186: while (!RB_EMPTY(&s->windows)) {
187: wl = RB_ROOT(&s->windows);
188: notify_window_unlinked(s, wl->window);
189: winlink_remove(&s->windows, wl);
190: }
1.1 nicm 191:
1.41 nicm 192: close(s->cwd);
1.15 nicm 193:
1.25 nicm 194: RB_INSERT(sessions, &dead_sessions, s);
1.31 nicm 195: }
196:
1.42 nicm 197: /* Check a session name is valid: not empty and no colons or periods. */
1.31 nicm 198: int
199: session_check_name(const char *name)
200: {
1.42 nicm 201: return (*name != '\0' && name[strcspn(name, ":.")] == '\0');
1.27 nicm 202: }
203:
204: /* Update session active time. */
205: void
206: session_update_activity(struct session *s)
207: {
208: if (gettimeofday(&s->activity_time, NULL) != 0)
209: fatal("gettimeofday");
1.20 nicm 210: }
211:
212: /* Find the next usable session. */
213: struct session *
214: session_next_session(struct session *s)
215: {
216: struct session *s2;
217:
1.25 nicm 218: if (RB_EMPTY(&sessions) || !session_alive(s))
1.20 nicm 219: return (NULL);
220:
1.29 nicm 221: s2 = RB_NEXT(sessions, &sessions, s);
1.28 nicm 222: if (s2 == NULL)
223: s2 = RB_MIN(sessions, &sessions);
1.25 nicm 224: if (s2 == s)
225: return (NULL);
1.20 nicm 226: return (s2);
227: }
228:
229: /* Find the previous usable session. */
230: struct session *
231: session_previous_session(struct session *s)
232: {
233: struct session *s2;
234:
1.25 nicm 235: if (RB_EMPTY(&sessions) || !session_alive(s))
1.20 nicm 236: return (NULL);
237:
1.29 nicm 238: s2 = RB_PREV(sessions, &sessions, s);
1.28 nicm 239: if (s2 == NULL)
240: s2 = RB_MAX(sessions, &sessions);
1.25 nicm 241: if (s2 == s)
242: return (NULL);
1.20 nicm 243: return (s2);
1.1 nicm 244: }
245:
246: /* Create a new window on a session. */
247: struct winlink *
1.44 nicm 248: session_new(struct session *s, const char *name, int argc, char **argv,
1.43 nicm 249: const char *path, int cwd, int idx, char **cause)
1.1 nicm 250: {
251: struct window *w;
1.30 nicm 252: struct winlink *wl;
1.3 nicm 253: struct environ env;
1.6 nicm 254: const char *shell;
1.1 nicm 255: u_int hlimit;
256:
1.30 nicm 257: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
258: xasprintf(cause, "index in use: %d", idx);
259: return (NULL);
260: }
261:
1.3 nicm 262: environ_init(&env);
263: environ_copy(&global_environ, &env);
264: environ_copy(&s->environ, &env);
265: server_fill_environ(s, &env);
1.1 nicm 266:
1.6 nicm 267: shell = options_get_string(&s->options, "default-shell");
268: if (*shell == '\0' || areshell(shell))
269: shell = _PATH_BSHELL;
270:
1.1 nicm 271: hlimit = options_get_number(&s->options, "history-limit");
1.44 nicm 272: w = window_create(name, argc, argv, path, shell, cwd, &env, s->tio,
273: s->sx, s->sy, hlimit, cause);
1.3 nicm 274: if (w == NULL) {
1.30 nicm 275: winlink_remove(&s->windows, wl);
1.3 nicm 276: environ_free(&env);
1.1 nicm 277: return (NULL);
1.3 nicm 278: }
1.30 nicm 279: winlink_set_window(wl, w);
1.33 nicm 280: notify_window_linked(s, w);
1.3 nicm 281: environ_free(&env);
1.1 nicm 282:
283: if (options_get_number(&s->options, "set-remain-on-exit"))
284: options_set_number(&w->options, "remain-on-exit", 1);
285:
1.30 nicm 286: session_group_synchronize_from(s);
287: return (wl);
1.1 nicm 288: }
289:
290: /* Attach a window to a session. */
291: struct winlink *
292: session_attach(struct session *s, struct window *w, int idx, char **cause)
293: {
294: struct winlink *wl;
295:
1.30 nicm 296: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
1.1 nicm 297: xasprintf(cause, "index in use: %d", idx);
1.30 nicm 298: return (NULL);
299: }
300: winlink_set_window(wl, w);
1.33 nicm 301: notify_window_linked(s, w);
1.30 nicm 302:
1.11 nicm 303: session_group_synchronize_from(s);
1.1 nicm 304: return (wl);
305: }
306:
307: /* Detach a window from a session. */
308: int
309: session_detach(struct session *s, struct winlink *wl)
310: {
311: if (s->curw == wl &&
312: session_last(s) != 0 && session_previous(s, 0) != 0)
313: session_next(s, 0);
314:
1.18 nicm 315: wl->flags &= ~WINLINK_ALERTFLAGS;
1.33 nicm 316: notify_window_unlinked(s, wl->window);
1.1 nicm 317: winlink_stack_remove(&s->lastw, wl);
318: winlink_remove(&s->windows, wl);
1.11 nicm 319: session_group_synchronize_from(s);
1.1 nicm 320: if (RB_EMPTY(&s->windows)) {
321: session_destroy(s);
322: return (1);
323: }
324: return (0);
325: }
326:
327: /* Return if session has window. */
1.47 nicm 328: int
1.1 nicm 329: session_has(struct session *s, struct window *w)
330: {
331: struct winlink *wl;
332:
333: RB_FOREACH(wl, winlinks, &s->windows) {
334: if (wl->window == w)
1.47 nicm 335: return (1);
1.1 nicm 336: }
1.47 nicm 337: return (0);
1.1 nicm 338: }
339:
340: struct winlink *
1.18 nicm 341: session_next_alert(struct winlink *wl)
1.1 nicm 342: {
343: while (wl != NULL) {
1.18 nicm 344: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 345: break;
1.14 nicm 346: wl = winlink_next(wl);
1.1 nicm 347: }
348: return (wl);
349: }
350:
351: /* Move session to next window. */
352: int
1.17 nicm 353: session_next(struct session *s, int alert)
1.1 nicm 354: {
355: struct winlink *wl;
356:
357: if (s->curw == NULL)
358: return (-1);
359:
1.14 nicm 360: wl = winlink_next(s->curw);
1.17 nicm 361: if (alert)
1.18 nicm 362: wl = session_next_alert(wl);
1.1 nicm 363: if (wl == NULL) {
364: wl = RB_MIN(winlinks, &s->windows);
1.18 nicm 365: if (alert && ((wl = session_next_alert(wl)) == NULL))
1.1 nicm 366: return (-1);
367: }
1.37 nicm 368: return (session_set_current(s, wl));
1.1 nicm 369: }
370:
371: struct winlink *
1.18 nicm 372: session_previous_alert(struct winlink *wl)
1.1 nicm 373: {
374: while (wl != NULL) {
1.18 nicm 375: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 376: break;
1.14 nicm 377: wl = winlink_previous(wl);
1.1 nicm 378: }
379: return (wl);
380: }
381:
382: /* Move session to previous window. */
383: int
1.17 nicm 384: session_previous(struct session *s, int alert)
1.1 nicm 385: {
386: struct winlink *wl;
387:
388: if (s->curw == NULL)
389: return (-1);
390:
1.14 nicm 391: wl = winlink_previous(s->curw);
1.17 nicm 392: if (alert)
1.18 nicm 393: wl = session_previous_alert(wl);
1.1 nicm 394: if (wl == NULL) {
395: wl = RB_MAX(winlinks, &s->windows);
1.18 nicm 396: if (alert && (wl = session_previous_alert(wl)) == NULL)
1.1 nicm 397: return (-1);
398: }
1.37 nicm 399: return (session_set_current(s, wl));
1.1 nicm 400: }
401:
402: /* Move session to specific window. */
403: int
404: session_select(struct session *s, int idx)
405: {
406: struct winlink *wl;
407:
408: wl = winlink_find_by_index(&s->windows, idx);
1.37 nicm 409: return (session_set_current(s, wl));
1.1 nicm 410: }
411:
412: /* Move session to last used window. */
413: int
414: session_last(struct session *s)
415: {
416: struct winlink *wl;
417:
1.11 nicm 418: wl = TAILQ_FIRST(&s->lastw);
1.37 nicm 419: if (wl == NULL)
420: return (-1);
421: if (wl == s->curw)
422: return (1);
423:
424: return (session_set_current(s, wl));
425: }
426:
427: /* Set current winlink to wl .*/
428: int
429: session_set_current(struct session *s, struct winlink *wl)
430: {
1.1 nicm 431: if (wl == NULL)
432: return (-1);
433: if (wl == s->curw)
434: return (1);
435:
436: winlink_stack_remove(&s->lastw, wl);
437: winlink_stack_push(&s->lastw, s->curw);
438: s->curw = wl;
1.35 nicm 439: winlink_clear_flags(wl);
1.1 nicm 440: return (0);
1.11 nicm 441: }
442:
443: /* Find the session group containing a session. */
444: struct session_group *
445: session_group_find(struct session *target)
446: {
447: struct session_group *sg;
448: struct session *s;
449:
450: TAILQ_FOREACH(sg, &session_groups, entry) {
451: TAILQ_FOREACH(s, &sg->sessions, gentry) {
452: if (s == target)
453: return (sg);
454: }
455: }
456: return (NULL);
457: }
458:
459: /* Find session group index. */
460: u_int
461: session_group_index(struct session_group *sg)
462: {
463: struct session_group *sg2;
464: u_int i;
465:
466: i = 0;
467: TAILQ_FOREACH(sg2, &session_groups, entry) {
468: if (sg == sg2)
469: return (i);
470: i++;
471: }
472:
473: fatalx("session group not found");
474: }
475:
476: /*
477: * Add a session to the session group containing target, creating it if
1.15 nicm 478: * necessary.
1.11 nicm 479: */
480: void
481: session_group_add(struct session *target, struct session *s)
482: {
483: struct session_group *sg;
484:
485: if ((sg = session_group_find(target)) == NULL) {
486: sg = xmalloc(sizeof *sg);
487: TAILQ_INSERT_TAIL(&session_groups, sg, entry);
488: TAILQ_INIT(&sg->sessions);
489: TAILQ_INSERT_TAIL(&sg->sessions, target, gentry);
490: }
491: TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
492: }
493:
494: /* Remove a session from its group and destroy the group if empty. */
495: void
496: session_group_remove(struct session *s)
497: {
498: struct session_group *sg;
499:
500: if ((sg = session_group_find(s)) == NULL)
501: return;
502: TAILQ_REMOVE(&sg->sessions, s, gentry);
503: if (TAILQ_NEXT(TAILQ_FIRST(&sg->sessions), gentry) == NULL)
504: TAILQ_REMOVE(&sg->sessions, TAILQ_FIRST(&sg->sessions), gentry);
505: if (TAILQ_EMPTY(&sg->sessions)) {
506: TAILQ_REMOVE(&session_groups, sg, entry);
1.36 nicm 507: free(sg);
1.11 nicm 508: }
509: }
510:
1.45 nicm 511: /* Count number of sessions in session group. */
512: u_int
513: session_group_count(struct session_group *sg)
514: {
515: struct session *s;
516: u_int n;
517:
518: n = 0;
519: TAILQ_FOREACH(s, &sg->sessions, gentry)
520: n++;
521: return (n);
522: }
523:
1.11 nicm 524: /* Synchronize a session to its session group. */
525: void
526: session_group_synchronize_to(struct session *s)
527: {
528: struct session_group *sg;
529: struct session *target;
530:
531: if ((sg = session_group_find(s)) == NULL)
532: return;
533:
534: target = NULL;
535: TAILQ_FOREACH(target, &sg->sessions, gentry) {
536: if (target != s)
537: break;
538: }
539: session_group_synchronize1(target, s);
540: }
541:
542: /* Synchronize a session group to a session. */
543: void
544: session_group_synchronize_from(struct session *target)
545: {
546: struct session_group *sg;
547: struct session *s;
548:
549: if ((sg = session_group_find(target)) == NULL)
550: return;
551:
552: TAILQ_FOREACH(s, &sg->sessions, gentry) {
553: if (s != target)
554: session_group_synchronize1(target, s);
555: }
556: }
557:
558: /*
559: * Synchronize a session with a target session. This means destroying all
560: * winlinks then recreating them, then updating the current window, last window
561: * stack and alerts.
562: */
563: void
564: session_group_synchronize1(struct session *target, struct session *s)
565: {
566: struct winlinks old_windows, *ww;
567: struct winlink_stack old_lastw;
568: struct winlink *wl, *wl2;
569:
570: /* Don't do anything if the session is empty (it'll be destroyed). */
571: ww = &target->windows;
572: if (RB_EMPTY(ww))
573: return;
574:
575: /* If the current window has vanished, move to the next now. */
1.16 nicm 576: if (s->curw != NULL &&
577: winlink_find_by_index(ww, s->curw->idx) == NULL &&
578: session_last(s) != 0 && session_previous(s, 0) != 0)
579: session_next(s, 0);
1.11 nicm 580:
581: /* Save the old pointer and reset it. */
582: memcpy(&old_windows, &s->windows, sizeof old_windows);
583: RB_INIT(&s->windows);
584:
585: /* Link all the windows from the target. */
1.18 nicm 586: RB_FOREACH(wl, winlinks, ww) {
1.30 nicm 587: wl2 = winlink_add(&s->windows, wl->idx);
588: winlink_set_window(wl2, wl->window);
1.33 nicm 589: notify_window_linked(s, wl2->window);
1.18 nicm 590: wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
591: }
1.11 nicm 592:
593: /* Fix up the current window. */
594: if (s->curw != NULL)
595: s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
596: else
597: s->curw = winlink_find_by_index(&s->windows, target->curw->idx);
598:
599: /* Fix up the last window stack. */
600: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
601: TAILQ_INIT(&s->lastw);
602: TAILQ_FOREACH(wl, &old_lastw, sentry) {
603: wl2 = winlink_find_by_index(&s->windows, wl->idx);
604: if (wl2 != NULL)
605: TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
606: }
607:
608: /* Then free the old winlinks list. */
609: while (!RB_EMPTY(&old_windows)) {
610: wl = RB_ROOT(&old_windows);
1.45 nicm 611: wl2 = winlink_find_by_window_id(&s->windows, wl->window->id);
612: if (wl2 == NULL)
613: notify_window_unlinked(s, wl->window);
1.13 nicm 614: winlink_remove(&old_windows, wl);
1.11 nicm 615: }
1.34 nicm 616: }
617:
618: /* Renumber the windows across winlinks attached to a specific session. */
619: void
620: session_renumber_windows(struct session *s)
621: {
622: struct winlink *wl, *wl1, *wl_new;
623: struct winlinks old_wins;
624: struct winlink_stack old_lastw;
625: int new_idx, new_curw_idx;
626:
627: /* Save and replace old window list. */
628: memcpy(&old_wins, &s->windows, sizeof old_wins);
629: RB_INIT(&s->windows);
630:
631: /* Start renumbering from the base-index if it's set. */
632: new_idx = options_get_number(&s->options, "base-index");
633: new_curw_idx = 0;
634:
635: /* Go through the winlinks and assign new indexes. */
636: RB_FOREACH(wl, winlinks, &old_wins) {
637: wl_new = winlink_add(&s->windows, new_idx);
638: winlink_set_window(wl_new, wl->window);
639: wl_new->flags |= wl->flags & WINLINK_ALERTFLAGS;
640:
641: if (wl == s->curw)
642: new_curw_idx = wl_new->idx;
643:
644: new_idx++;
645: }
646:
647: /* Fix the stack of last windows now. */
648: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
649: TAILQ_INIT(&s->lastw);
650: TAILQ_FOREACH(wl, &old_lastw, sentry) {
1.40 nicm 651: wl_new = winlink_find_by_window(&s->windows, wl->window);
1.34 nicm 652: if (wl_new != NULL)
653: TAILQ_INSERT_TAIL(&s->lastw, wl_new, sentry);
654: }
655:
656: /* Set the current window. */
657: s->curw = winlink_find_by_index(&s->windows, new_curw_idx);
658:
659: /* Free the old winlinks (reducing window references too). */
660: RB_FOREACH_SAFE(wl, winlinks, &old_wins, wl1)
661: winlink_remove(&old_wins, wl);
1.1 nicm 662: }
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