Annotation of src/usr.bin/tmux/session.c, Revision 1.35
1.35 ! nicm 1: /* $OpenBSD: session.c,v 1.34 2012/04/29 17:20:01 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;
1.25 nicm 33: u_int next_session;
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));
71: }
72:
73: /* Find session by index. */
74: struct session *
75: session_find_by_index(u_int idx)
76: {
1.1 nicm 77: struct session *s;
78:
1.25 nicm 79: RB_FOREACH(s, sessions, &sessions) {
80: if (s->idx == idx)
1.1 nicm 81: return (s);
82: }
83: return (NULL);
84: }
85:
86: /* Create a new session. */
87: struct session *
1.3 nicm 88: session_create(const char *name, const char *cmd, const char *cwd,
1.5 nicm 89: struct environ *env, struct termios *tio, int idx, u_int sx, u_int sy,
90: char **cause)
1.1 nicm 91: {
92: struct session *s;
93:
94: s = xmalloc(sizeof *s);
1.7 nicm 95: s->references = 0;
1.1 nicm 96: s->flags = 0;
1.7 nicm 97:
1.12 nicm 98: if (gettimeofday(&s->creation_time, NULL) != 0)
1.9 nicm 99: fatal("gettimeofday failed");
1.27 nicm 100: session_update_activity(s);
1.7 nicm 101:
1.19 nicm 102: s->cwd = xstrdup(cwd);
103:
1.1 nicm 104: s->curw = NULL;
1.11 nicm 105: TAILQ_INIT(&s->lastw);
1.1 nicm 106: RB_INIT(&s->windows);
1.7 nicm 107:
1.2 nicm 108: options_init(&s->options, &global_s_options);
1.3 nicm 109: environ_init(&s->environ);
110: if (env != NULL)
111: environ_copy(env, &s->environ);
1.8 nicm 112:
113: s->tio = NULL;
114: if (tio != NULL) {
115: s->tio = xmalloc(sizeof *s->tio);
116: memcpy(s->tio, tio, sizeof *s->tio);
117: }
1.1 nicm 118:
119: s->sx = sx;
120: s->sy = sy;
121:
1.32 nicm 122: if (name != NULL) {
1.1 nicm 123: s->name = xstrdup(name);
1.32 nicm 124: s->idx = next_session++;
125: } else {
126: s->name = NULL;
127: do {
128: s->idx = next_session++;
129: if (s->name != NULL)
130: xfree (s->name);
131: xasprintf(&s->name, "%u", s->idx);
132: } while (RB_FIND(sessions, &sessions, s) != NULL);
133: }
1.25 nicm 134: RB_INSERT(sessions, &sessions, s);
1.15 nicm 135:
1.11 nicm 136: if (cmd != NULL) {
137: if (session_new(s, NULL, cmd, cwd, idx, cause) == NULL) {
138: session_destroy(s);
139: return (NULL);
140: }
141: session_select(s, RB_ROOT(&s->windows)->idx);
1.1 nicm 142: }
143:
144: log_debug("session %s created", s->name);
1.33 nicm 145: notify_session_created(s);
1.1 nicm 146:
147: return (s);
148: }
149:
150: /* Destroy a session. */
151: void
152: session_destroy(struct session *s)
153: {
1.33 nicm 154: struct winlink *wl;
1.1 nicm 155: log_debug("session %s destroyed", s->name);
156:
1.25 nicm 157: RB_REMOVE(sessions, &sessions, s);
1.33 nicm 158: notify_session_closed(s);
1.1 nicm 159:
1.8 nicm 160: if (s->tio != NULL)
161: xfree(s->tio);
162:
1.11 nicm 163: session_group_remove(s);
1.3 nicm 164: environ_free(&s->environ);
1.1 nicm 165: options_free(&s->options);
166:
1.11 nicm 167: while (!TAILQ_EMPTY(&s->lastw))
168: winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
1.33 nicm 169: while (!RB_EMPTY(&s->windows)) {
170: wl = RB_ROOT(&s->windows);
171: notify_window_unlinked(s, wl->window);
172: winlink_remove(&s->windows, wl);
173: }
1.1 nicm 174:
1.19 nicm 175: xfree(s->cwd);
1.15 nicm 176:
1.25 nicm 177: RB_INSERT(sessions, &dead_sessions, s);
1.31 nicm 178: }
179:
180: /* Check a session name is valid: not empty and no colons. */
181: int
182: session_check_name(const char *name)
183: {
184: return (*name != '\0' && strchr(name, ':') == NULL);
1.27 nicm 185: }
186:
187: /* Update session active time. */
188: void
189: session_update_activity(struct session *s)
190: {
191: if (gettimeofday(&s->activity_time, NULL) != 0)
192: fatal("gettimeofday");
1.20 nicm 193: }
194:
195: /* Find the next usable session. */
196: struct session *
197: session_next_session(struct session *s)
198: {
199: struct session *s2;
200:
1.25 nicm 201: if (RB_EMPTY(&sessions) || !session_alive(s))
1.20 nicm 202: return (NULL);
203:
1.29 nicm 204: s2 = RB_NEXT(sessions, &sessions, s);
1.28 nicm 205: if (s2 == NULL)
206: s2 = RB_MIN(sessions, &sessions);
1.25 nicm 207: if (s2 == s)
208: return (NULL);
1.20 nicm 209: return (s2);
210: }
211:
212: /* Find the previous usable session. */
213: struct session *
214: session_previous_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_PREV(sessions, &sessions, s);
1.28 nicm 222: if (s2 == NULL)
223: s2 = RB_MAX(sessions, &sessions);
1.25 nicm 224: if (s2 == s)
225: return (NULL);
1.20 nicm 226: return (s2);
1.1 nicm 227: }
228:
229: /* Create a new window on a session. */
230: struct winlink *
1.15 nicm 231: session_new(struct session *s,
1.1 nicm 232: const char *name, const char *cmd, const char *cwd, int idx, char **cause)
233: {
234: struct window *w;
1.30 nicm 235: struct winlink *wl;
1.3 nicm 236: struct environ env;
1.6 nicm 237: const char *shell;
1.1 nicm 238: u_int hlimit;
239:
1.30 nicm 240: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
241: xasprintf(cause, "index in use: %d", idx);
242: return (NULL);
243: }
244:
1.3 nicm 245: environ_init(&env);
246: environ_copy(&global_environ, &env);
247: environ_copy(&s->environ, &env);
248: server_fill_environ(s, &env);
1.1 nicm 249:
1.6 nicm 250: shell = options_get_string(&s->options, "default-shell");
251: if (*shell == '\0' || areshell(shell))
252: shell = _PATH_BSHELL;
253:
1.1 nicm 254: hlimit = options_get_number(&s->options, "history-limit");
1.4 nicm 255: w = window_create(
1.8 nicm 256: name, cmd, shell, cwd, &env, s->tio, s->sx, s->sy, hlimit, cause);
1.3 nicm 257: if (w == NULL) {
1.30 nicm 258: winlink_remove(&s->windows, wl);
1.3 nicm 259: environ_free(&env);
1.1 nicm 260: return (NULL);
1.3 nicm 261: }
1.30 nicm 262: winlink_set_window(wl, w);
1.33 nicm 263: notify_window_linked(s, w);
1.3 nicm 264: environ_free(&env);
1.1 nicm 265:
266: if (options_get_number(&s->options, "set-remain-on-exit"))
267: options_set_number(&w->options, "remain-on-exit", 1);
268:
1.30 nicm 269: session_group_synchronize_from(s);
270: return (wl);
1.1 nicm 271: }
272:
273: /* Attach a window to a session. */
274: struct winlink *
275: session_attach(struct session *s, struct window *w, int idx, char **cause)
276: {
277: struct winlink *wl;
278:
1.30 nicm 279: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
1.1 nicm 280: xasprintf(cause, "index in use: %d", idx);
1.30 nicm 281: return (NULL);
282: }
283: winlink_set_window(wl, w);
1.33 nicm 284: notify_window_linked(s, w);
1.30 nicm 285:
1.11 nicm 286: session_group_synchronize_from(s);
1.1 nicm 287: return (wl);
288: }
289:
290: /* Detach a window from a session. */
291: int
292: session_detach(struct session *s, struct winlink *wl)
293: {
294: if (s->curw == wl &&
295: session_last(s) != 0 && session_previous(s, 0) != 0)
296: session_next(s, 0);
297:
1.18 nicm 298: wl->flags &= ~WINLINK_ALERTFLAGS;
1.33 nicm 299: notify_window_unlinked(s, wl->window);
1.1 nicm 300: winlink_stack_remove(&s->lastw, wl);
301: winlink_remove(&s->windows, wl);
1.11 nicm 302: session_group_synchronize_from(s);
1.1 nicm 303: if (RB_EMPTY(&s->windows)) {
304: session_destroy(s);
305: return (1);
306: }
307: return (0);
308: }
309:
310: /* Return if session has window. */
1.18 nicm 311: struct winlink *
1.1 nicm 312: session_has(struct session *s, struct window *w)
313: {
314: struct winlink *wl;
315:
316: RB_FOREACH(wl, winlinks, &s->windows) {
317: if (wl->window == w)
1.18 nicm 318: return (wl);
1.1 nicm 319: }
1.18 nicm 320: return (NULL);
1.1 nicm 321: }
322:
323: struct winlink *
1.18 nicm 324: session_next_alert(struct winlink *wl)
1.1 nicm 325: {
326: while (wl != NULL) {
1.18 nicm 327: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 328: break;
1.14 nicm 329: wl = winlink_next(wl);
1.1 nicm 330: }
331: return (wl);
332: }
333:
334: /* Move session to next window. */
335: int
1.17 nicm 336: session_next(struct session *s, int alert)
1.1 nicm 337: {
338: struct winlink *wl;
339:
340: if (s->curw == NULL)
341: return (-1);
342:
1.14 nicm 343: wl = winlink_next(s->curw);
1.17 nicm 344: if (alert)
1.18 nicm 345: wl = session_next_alert(wl);
1.1 nicm 346: if (wl == NULL) {
347: wl = RB_MIN(winlinks, &s->windows);
1.18 nicm 348: if (alert && ((wl = session_next_alert(wl)) == NULL))
1.1 nicm 349: return (-1);
350: }
351: if (wl == s->curw)
352: return (1);
353: winlink_stack_remove(&s->lastw, wl);
354: winlink_stack_push(&s->lastw, s->curw);
355: s->curw = wl;
1.35 ! nicm 356: winlink_clear_flags(wl);
1.1 nicm 357: return (0);
358: }
359:
360: struct winlink *
1.18 nicm 361: session_previous_alert(struct winlink *wl)
1.1 nicm 362: {
363: while (wl != NULL) {
1.18 nicm 364: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 365: break;
1.14 nicm 366: wl = winlink_previous(wl);
1.1 nicm 367: }
368: return (wl);
369: }
370:
371: /* Move session to previous window. */
372: int
1.17 nicm 373: session_previous(struct session *s, int alert)
1.1 nicm 374: {
375: struct winlink *wl;
376:
377: if (s->curw == NULL)
378: return (-1);
379:
1.14 nicm 380: wl = winlink_previous(s->curw);
1.17 nicm 381: if (alert)
1.18 nicm 382: wl = session_previous_alert(wl);
1.1 nicm 383: if (wl == NULL) {
384: wl = RB_MAX(winlinks, &s->windows);
1.18 nicm 385: if (alert && (wl = session_previous_alert(wl)) == NULL)
1.1 nicm 386: return (-1);
387: }
388: if (wl == s->curw)
389: return (1);
390: winlink_stack_remove(&s->lastw, wl);
391: winlink_stack_push(&s->lastw, s->curw);
392: s->curw = wl;
1.35 ! nicm 393: winlink_clear_flags(wl);
1.1 nicm 394: return (0);
395: }
396:
397: /* Move session to specific window. */
398: int
399: session_select(struct session *s, int idx)
400: {
401: struct winlink *wl;
402:
403: wl = winlink_find_by_index(&s->windows, idx);
404: if (wl == NULL)
405: return (-1);
406: if (wl == s->curw)
407: return (1);
408: winlink_stack_remove(&s->lastw, wl);
409: winlink_stack_push(&s->lastw, s->curw);
410: s->curw = wl;
1.35 ! nicm 411: winlink_clear_flags(wl);
1.1 nicm 412: return (0);
413: }
414:
415: /* Move session to last used window. */
416: int
417: session_last(struct session *s)
418: {
419: struct winlink *wl;
420:
1.11 nicm 421: wl = TAILQ_FIRST(&s->lastw);
1.1 nicm 422: if (wl == NULL)
423: return (-1);
424: if (wl == s->curw)
425: return (1);
426:
427: winlink_stack_remove(&s->lastw, wl);
428: winlink_stack_push(&s->lastw, s->curw);
429: s->curw = wl;
1.35 ! nicm 430: winlink_clear_flags(wl);
1.1 nicm 431: return (0);
1.11 nicm 432: }
433:
434: /* Find the session group containing a session. */
435: struct session_group *
436: session_group_find(struct session *target)
437: {
438: struct session_group *sg;
439: struct session *s;
440:
441: TAILQ_FOREACH(sg, &session_groups, entry) {
442: TAILQ_FOREACH(s, &sg->sessions, gentry) {
443: if (s == target)
444: return (sg);
445: }
446: }
447: return (NULL);
448: }
449:
450: /* Find session group index. */
451: u_int
452: session_group_index(struct session_group *sg)
453: {
454: struct session_group *sg2;
455: u_int i;
456:
457: i = 0;
458: TAILQ_FOREACH(sg2, &session_groups, entry) {
459: if (sg == sg2)
460: return (i);
461: i++;
462: }
463:
464: fatalx("session group not found");
465: }
466:
467: /*
468: * Add a session to the session group containing target, creating it if
1.15 nicm 469: * necessary.
1.11 nicm 470: */
471: void
472: session_group_add(struct session *target, struct session *s)
473: {
474: struct session_group *sg;
475:
476: if ((sg = session_group_find(target)) == NULL) {
477: sg = xmalloc(sizeof *sg);
478: TAILQ_INSERT_TAIL(&session_groups, sg, entry);
479: TAILQ_INIT(&sg->sessions);
480: TAILQ_INSERT_TAIL(&sg->sessions, target, gentry);
481: }
482: TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
483: }
484:
485: /* Remove a session from its group and destroy the group if empty. */
486: void
487: session_group_remove(struct session *s)
488: {
489: struct session_group *sg;
490:
491: if ((sg = session_group_find(s)) == NULL)
492: return;
493: TAILQ_REMOVE(&sg->sessions, s, gentry);
494: if (TAILQ_NEXT(TAILQ_FIRST(&sg->sessions), gentry) == NULL)
495: TAILQ_REMOVE(&sg->sessions, TAILQ_FIRST(&sg->sessions), gentry);
496: if (TAILQ_EMPTY(&sg->sessions)) {
497: TAILQ_REMOVE(&session_groups, sg, entry);
498: xfree(sg);
499: }
500: }
501:
502: /* Synchronize a session to its session group. */
503: void
504: session_group_synchronize_to(struct session *s)
505: {
506: struct session_group *sg;
507: struct session *target;
508:
509: if ((sg = session_group_find(s)) == NULL)
510: return;
511:
512: target = NULL;
513: TAILQ_FOREACH(target, &sg->sessions, gentry) {
514: if (target != s)
515: break;
516: }
517: session_group_synchronize1(target, s);
518: }
519:
520: /* Synchronize a session group to a session. */
521: void
522: session_group_synchronize_from(struct session *target)
523: {
524: struct session_group *sg;
525: struct session *s;
526:
527: if ((sg = session_group_find(target)) == NULL)
528: return;
529:
530: TAILQ_FOREACH(s, &sg->sessions, gentry) {
531: if (s != target)
532: session_group_synchronize1(target, s);
533: }
534: }
535:
536: /*
537: * Synchronize a session with a target session. This means destroying all
538: * winlinks then recreating them, then updating the current window, last window
539: * stack and alerts.
540: */
541: void
542: session_group_synchronize1(struct session *target, struct session *s)
543: {
544: struct winlinks old_windows, *ww;
545: struct winlink_stack old_lastw;
546: struct winlink *wl, *wl2;
547:
548: /* Don't do anything if the session is empty (it'll be destroyed). */
549: ww = &target->windows;
550: if (RB_EMPTY(ww))
551: return;
552:
553: /* If the current window has vanished, move to the next now. */
1.16 nicm 554: if (s->curw != NULL &&
555: winlink_find_by_index(ww, s->curw->idx) == NULL &&
556: session_last(s) != 0 && session_previous(s, 0) != 0)
557: session_next(s, 0);
1.11 nicm 558:
559: /* Save the old pointer and reset it. */
560: memcpy(&old_windows, &s->windows, sizeof old_windows);
561: RB_INIT(&s->windows);
562:
563: /* Link all the windows from the target. */
1.18 nicm 564: RB_FOREACH(wl, winlinks, ww) {
1.30 nicm 565: wl2 = winlink_add(&s->windows, wl->idx);
566: winlink_set_window(wl2, wl->window);
1.33 nicm 567: notify_window_linked(s, wl2->window);
1.18 nicm 568: wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
569: }
1.11 nicm 570:
571: /* Fix up the current window. */
572: if (s->curw != NULL)
573: s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
574: else
575: s->curw = winlink_find_by_index(&s->windows, target->curw->idx);
576:
577: /* Fix up the last window stack. */
578: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
579: TAILQ_INIT(&s->lastw);
580: TAILQ_FOREACH(wl, &old_lastw, sentry) {
581: wl2 = winlink_find_by_index(&s->windows, wl->idx);
582: if (wl2 != NULL)
583: TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
584: }
585:
586: /* Then free the old winlinks list. */
587: while (!RB_EMPTY(&old_windows)) {
588: wl = RB_ROOT(&old_windows);
1.33 nicm 589: if (winlink_find_by_window_id(&s->windows, wl->window->id) == NULL)
590: notify_window_unlinked(s, wl->window);
1.13 nicm 591: winlink_remove(&old_windows, wl);
1.11 nicm 592: }
1.34 nicm 593: }
594:
595: /* Renumber the windows across winlinks attached to a specific session. */
596: void
597: session_renumber_windows(struct session *s)
598: {
599: struct winlink *wl, *wl1, *wl_new;
600: struct winlinks old_wins;
601: struct winlink_stack old_lastw;
602: int new_idx, new_curw_idx;
603:
604: /* Save and replace old window list. */
605: memcpy(&old_wins, &s->windows, sizeof old_wins);
606: RB_INIT(&s->windows);
607:
608: /* Start renumbering from the base-index if it's set. */
609: new_idx = options_get_number(&s->options, "base-index");
610: new_curw_idx = 0;
611:
612: /* Go through the winlinks and assign new indexes. */
613: RB_FOREACH(wl, winlinks, &old_wins) {
614: wl_new = winlink_add(&s->windows, new_idx);
615: winlink_set_window(wl_new, wl->window);
616: wl_new->flags |= wl->flags & WINLINK_ALERTFLAGS;
617:
618: if (wl == s->curw)
619: new_curw_idx = wl_new->idx;
620:
621: new_idx++;
622: }
623:
624: /* Fix the stack of last windows now. */
625: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
626: TAILQ_INIT(&s->lastw);
627: TAILQ_FOREACH(wl, &old_lastw, sentry) {
628: wl_new = winlink_find_by_index(&s->windows, wl->idx);
629: if (wl_new != NULL)
630: TAILQ_INSERT_TAIL(&s->lastw, wl_new, sentry);
631: }
632:
633: /* Set the current window. */
634: s->curw = winlink_find_by_index(&s->windows, new_curw_idx);
635:
636: /* Free the old winlinks (reducing window references too). */
637: RB_FOREACH_SAFE(wl, winlinks, &old_wins, wl1)
638: winlink_remove(&old_wins, wl);
1.1 nicm 639: }
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