Annotation of src/usr.bin/tmux/session.c, Revision 1.36
1.36 ! nicm 1: /* $OpenBSD: session.c,v 1.35 2012/07/08 07:27:32 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++;
1.36 ! nicm 129: free (s->name);
1.32 nicm 130: xasprintf(&s->name, "%u", s->idx);
131: } while (RB_FIND(sessions, &sessions, s) != NULL);
132: }
1.25 nicm 133: RB_INSERT(sessions, &sessions, s);
1.15 nicm 134:
1.11 nicm 135: if (cmd != NULL) {
136: if (session_new(s, NULL, cmd, cwd, idx, cause) == NULL) {
137: session_destroy(s);
138: return (NULL);
139: }
140: session_select(s, RB_ROOT(&s->windows)->idx);
1.1 nicm 141: }
142:
143: log_debug("session %s created", s->name);
1.33 nicm 144: notify_session_created(s);
1.1 nicm 145:
146: return (s);
147: }
148:
149: /* Destroy a session. */
150: void
151: session_destroy(struct session *s)
152: {
1.33 nicm 153: struct winlink *wl;
1.1 nicm 154: log_debug("session %s destroyed", s->name);
155:
1.25 nicm 156: RB_REMOVE(sessions, &sessions, s);
1.33 nicm 157: notify_session_closed(s);
1.1 nicm 158:
1.36 ! nicm 159: free(s->tio);
1.8 nicm 160:
1.11 nicm 161: session_group_remove(s);
1.3 nicm 162: environ_free(&s->environ);
1.1 nicm 163: options_free(&s->options);
164:
1.11 nicm 165: while (!TAILQ_EMPTY(&s->lastw))
166: winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
1.33 nicm 167: while (!RB_EMPTY(&s->windows)) {
168: wl = RB_ROOT(&s->windows);
169: notify_window_unlinked(s, wl->window);
170: winlink_remove(&s->windows, wl);
171: }
1.1 nicm 172:
1.36 ! nicm 173: free(s->cwd);
1.15 nicm 174:
1.25 nicm 175: RB_INSERT(sessions, &dead_sessions, s);
1.31 nicm 176: }
177:
178: /* Check a session name is valid: not empty and no colons. */
179: int
180: session_check_name(const char *name)
181: {
182: return (*name != '\0' && strchr(name, ':') == NULL);
1.27 nicm 183: }
184:
185: /* Update session active time. */
186: void
187: session_update_activity(struct session *s)
188: {
189: if (gettimeofday(&s->activity_time, NULL) != 0)
190: fatal("gettimeofday");
1.20 nicm 191: }
192:
193: /* Find the next usable session. */
194: struct session *
195: session_next_session(struct session *s)
196: {
197: struct session *s2;
198:
1.25 nicm 199: if (RB_EMPTY(&sessions) || !session_alive(s))
1.20 nicm 200: return (NULL);
201:
1.29 nicm 202: s2 = RB_NEXT(sessions, &sessions, s);
1.28 nicm 203: if (s2 == NULL)
204: s2 = RB_MIN(sessions, &sessions);
1.25 nicm 205: if (s2 == s)
206: return (NULL);
1.20 nicm 207: return (s2);
208: }
209:
210: /* Find the previous usable session. */
211: struct session *
212: session_previous_session(struct session *s)
213: {
214: struct session *s2;
215:
1.25 nicm 216: if (RB_EMPTY(&sessions) || !session_alive(s))
1.20 nicm 217: return (NULL);
218:
1.29 nicm 219: s2 = RB_PREV(sessions, &sessions, s);
1.28 nicm 220: if (s2 == NULL)
221: s2 = RB_MAX(sessions, &sessions);
1.25 nicm 222: if (s2 == s)
223: return (NULL);
1.20 nicm 224: return (s2);
1.1 nicm 225: }
226:
227: /* Create a new window on a session. */
228: struct winlink *
1.15 nicm 229: session_new(struct session *s,
1.1 nicm 230: const char *name, const char *cmd, const char *cwd, int idx, char **cause)
231: {
232: struct window *w;
1.30 nicm 233: struct winlink *wl;
1.3 nicm 234: struct environ env;
1.6 nicm 235: const char *shell;
1.1 nicm 236: u_int hlimit;
237:
1.30 nicm 238: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
239: xasprintf(cause, "index in use: %d", idx);
240: return (NULL);
241: }
242:
1.3 nicm 243: environ_init(&env);
244: environ_copy(&global_environ, &env);
245: environ_copy(&s->environ, &env);
246: server_fill_environ(s, &env);
1.1 nicm 247:
1.6 nicm 248: shell = options_get_string(&s->options, "default-shell");
249: if (*shell == '\0' || areshell(shell))
250: shell = _PATH_BSHELL;
251:
1.1 nicm 252: hlimit = options_get_number(&s->options, "history-limit");
1.4 nicm 253: w = window_create(
1.8 nicm 254: name, cmd, shell, cwd, &env, s->tio, s->sx, s->sy, hlimit, cause);
1.3 nicm 255: if (w == NULL) {
1.30 nicm 256: winlink_remove(&s->windows, wl);
1.3 nicm 257: environ_free(&env);
1.1 nicm 258: return (NULL);
1.3 nicm 259: }
1.30 nicm 260: winlink_set_window(wl, w);
1.33 nicm 261: notify_window_linked(s, w);
1.3 nicm 262: environ_free(&env);
1.1 nicm 263:
264: if (options_get_number(&s->options, "set-remain-on-exit"))
265: options_set_number(&w->options, "remain-on-exit", 1);
266:
1.30 nicm 267: session_group_synchronize_from(s);
268: return (wl);
1.1 nicm 269: }
270:
271: /* Attach a window to a session. */
272: struct winlink *
273: session_attach(struct session *s, struct window *w, int idx, char **cause)
274: {
275: struct winlink *wl;
276:
1.30 nicm 277: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
1.1 nicm 278: xasprintf(cause, "index in use: %d", idx);
1.30 nicm 279: return (NULL);
280: }
281: winlink_set_window(wl, w);
1.33 nicm 282: notify_window_linked(s, w);
1.30 nicm 283:
1.11 nicm 284: session_group_synchronize_from(s);
1.1 nicm 285: return (wl);
286: }
287:
288: /* Detach a window from a session. */
289: int
290: session_detach(struct session *s, struct winlink *wl)
291: {
292: if (s->curw == wl &&
293: session_last(s) != 0 && session_previous(s, 0) != 0)
294: session_next(s, 0);
295:
1.18 nicm 296: wl->flags &= ~WINLINK_ALERTFLAGS;
1.33 nicm 297: notify_window_unlinked(s, wl->window);
1.1 nicm 298: winlink_stack_remove(&s->lastw, wl);
299: winlink_remove(&s->windows, wl);
1.11 nicm 300: session_group_synchronize_from(s);
1.1 nicm 301: if (RB_EMPTY(&s->windows)) {
302: session_destroy(s);
303: return (1);
304: }
305: return (0);
306: }
307:
308: /* Return if session has window. */
1.18 nicm 309: struct winlink *
1.1 nicm 310: session_has(struct session *s, struct window *w)
311: {
312: struct winlink *wl;
313:
314: RB_FOREACH(wl, winlinks, &s->windows) {
315: if (wl->window == w)
1.18 nicm 316: return (wl);
1.1 nicm 317: }
1.18 nicm 318: return (NULL);
1.1 nicm 319: }
320:
321: struct winlink *
1.18 nicm 322: session_next_alert(struct winlink *wl)
1.1 nicm 323: {
324: while (wl != NULL) {
1.18 nicm 325: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 326: break;
1.14 nicm 327: wl = winlink_next(wl);
1.1 nicm 328: }
329: return (wl);
330: }
331:
332: /* Move session to next window. */
333: int
1.17 nicm 334: session_next(struct session *s, int alert)
1.1 nicm 335: {
336: struct winlink *wl;
337:
338: if (s->curw == NULL)
339: return (-1);
340:
1.14 nicm 341: wl = winlink_next(s->curw);
1.17 nicm 342: if (alert)
1.18 nicm 343: wl = session_next_alert(wl);
1.1 nicm 344: if (wl == NULL) {
345: wl = RB_MIN(winlinks, &s->windows);
1.18 nicm 346: if (alert && ((wl = session_next_alert(wl)) == NULL))
1.1 nicm 347: return (-1);
348: }
349: if (wl == s->curw)
350: return (1);
351: winlink_stack_remove(&s->lastw, wl);
352: winlink_stack_push(&s->lastw, s->curw);
353: s->curw = wl;
1.35 nicm 354: winlink_clear_flags(wl);
1.1 nicm 355: return (0);
356: }
357:
358: struct winlink *
1.18 nicm 359: session_previous_alert(struct winlink *wl)
1.1 nicm 360: {
361: while (wl != NULL) {
1.18 nicm 362: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 363: break;
1.14 nicm 364: wl = winlink_previous(wl);
1.1 nicm 365: }
366: return (wl);
367: }
368:
369: /* Move session to previous window. */
370: int
1.17 nicm 371: session_previous(struct session *s, int alert)
1.1 nicm 372: {
373: struct winlink *wl;
374:
375: if (s->curw == NULL)
376: return (-1);
377:
1.14 nicm 378: wl = winlink_previous(s->curw);
1.17 nicm 379: if (alert)
1.18 nicm 380: wl = session_previous_alert(wl);
1.1 nicm 381: if (wl == NULL) {
382: wl = RB_MAX(winlinks, &s->windows);
1.18 nicm 383: if (alert && (wl = session_previous_alert(wl)) == NULL)
1.1 nicm 384: return (-1);
385: }
386: if (wl == s->curw)
387: return (1);
388: winlink_stack_remove(&s->lastw, wl);
389: winlink_stack_push(&s->lastw, s->curw);
390: s->curw = wl;
1.35 nicm 391: winlink_clear_flags(wl);
1.1 nicm 392: return (0);
393: }
394:
395: /* Move session to specific window. */
396: int
397: session_select(struct session *s, int idx)
398: {
399: struct winlink *wl;
400:
401: wl = winlink_find_by_index(&s->windows, idx);
402: if (wl == NULL)
403: return (-1);
404: if (wl == s->curw)
405: return (1);
406: winlink_stack_remove(&s->lastw, wl);
407: winlink_stack_push(&s->lastw, s->curw);
408: s->curw = wl;
1.35 nicm 409: winlink_clear_flags(wl);
1.1 nicm 410: return (0);
411: }
412:
413: /* Move session to last used window. */
414: int
415: session_last(struct session *s)
416: {
417: struct winlink *wl;
418:
1.11 nicm 419: wl = TAILQ_FIRST(&s->lastw);
1.1 nicm 420: if (wl == NULL)
421: return (-1);
422: if (wl == s->curw)
423: return (1);
424:
425: winlink_stack_remove(&s->lastw, wl);
426: winlink_stack_push(&s->lastw, s->curw);
427: s->curw = wl;
1.35 nicm 428: winlink_clear_flags(wl);
1.1 nicm 429: return (0);
1.11 nicm 430: }
431:
432: /* Find the session group containing a session. */
433: struct session_group *
434: session_group_find(struct session *target)
435: {
436: struct session_group *sg;
437: struct session *s;
438:
439: TAILQ_FOREACH(sg, &session_groups, entry) {
440: TAILQ_FOREACH(s, &sg->sessions, gentry) {
441: if (s == target)
442: return (sg);
443: }
444: }
445: return (NULL);
446: }
447:
448: /* Find session group index. */
449: u_int
450: session_group_index(struct session_group *sg)
451: {
452: struct session_group *sg2;
453: u_int i;
454:
455: i = 0;
456: TAILQ_FOREACH(sg2, &session_groups, entry) {
457: if (sg == sg2)
458: return (i);
459: i++;
460: }
461:
462: fatalx("session group not found");
463: }
464:
465: /*
466: * Add a session to the session group containing target, creating it if
1.15 nicm 467: * necessary.
1.11 nicm 468: */
469: void
470: session_group_add(struct session *target, struct session *s)
471: {
472: struct session_group *sg;
473:
474: if ((sg = session_group_find(target)) == NULL) {
475: sg = xmalloc(sizeof *sg);
476: TAILQ_INSERT_TAIL(&session_groups, sg, entry);
477: TAILQ_INIT(&sg->sessions);
478: TAILQ_INSERT_TAIL(&sg->sessions, target, gentry);
479: }
480: TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
481: }
482:
483: /* Remove a session from its group and destroy the group if empty. */
484: void
485: session_group_remove(struct session *s)
486: {
487: struct session_group *sg;
488:
489: if ((sg = session_group_find(s)) == NULL)
490: return;
491: TAILQ_REMOVE(&sg->sessions, s, gentry);
492: if (TAILQ_NEXT(TAILQ_FIRST(&sg->sessions), gentry) == NULL)
493: TAILQ_REMOVE(&sg->sessions, TAILQ_FIRST(&sg->sessions), gentry);
494: if (TAILQ_EMPTY(&sg->sessions)) {
495: TAILQ_REMOVE(&session_groups, sg, entry);
1.36 ! nicm 496: free(sg);
1.11 nicm 497: }
498: }
499:
500: /* Synchronize a session to its session group. */
501: void
502: session_group_synchronize_to(struct session *s)
503: {
504: struct session_group *sg;
505: struct session *target;
506:
507: if ((sg = session_group_find(s)) == NULL)
508: return;
509:
510: target = NULL;
511: TAILQ_FOREACH(target, &sg->sessions, gentry) {
512: if (target != s)
513: break;
514: }
515: session_group_synchronize1(target, s);
516: }
517:
518: /* Synchronize a session group to a session. */
519: void
520: session_group_synchronize_from(struct session *target)
521: {
522: struct session_group *sg;
523: struct session *s;
524:
525: if ((sg = session_group_find(target)) == NULL)
526: return;
527:
528: TAILQ_FOREACH(s, &sg->sessions, gentry) {
529: if (s != target)
530: session_group_synchronize1(target, s);
531: }
532: }
533:
534: /*
535: * Synchronize a session with a target session. This means destroying all
536: * winlinks then recreating them, then updating the current window, last window
537: * stack and alerts.
538: */
539: void
540: session_group_synchronize1(struct session *target, struct session *s)
541: {
542: struct winlinks old_windows, *ww;
543: struct winlink_stack old_lastw;
544: struct winlink *wl, *wl2;
545:
546: /* Don't do anything if the session is empty (it'll be destroyed). */
547: ww = &target->windows;
548: if (RB_EMPTY(ww))
549: return;
550:
551: /* If the current window has vanished, move to the next now. */
1.16 nicm 552: if (s->curw != NULL &&
553: winlink_find_by_index(ww, s->curw->idx) == NULL &&
554: session_last(s) != 0 && session_previous(s, 0) != 0)
555: session_next(s, 0);
1.11 nicm 556:
557: /* Save the old pointer and reset it. */
558: memcpy(&old_windows, &s->windows, sizeof old_windows);
559: RB_INIT(&s->windows);
560:
561: /* Link all the windows from the target. */
1.18 nicm 562: RB_FOREACH(wl, winlinks, ww) {
1.30 nicm 563: wl2 = winlink_add(&s->windows, wl->idx);
564: winlink_set_window(wl2, wl->window);
1.33 nicm 565: notify_window_linked(s, wl2->window);
1.18 nicm 566: wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
567: }
1.11 nicm 568:
569: /* Fix up the current window. */
570: if (s->curw != NULL)
571: s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
572: else
573: s->curw = winlink_find_by_index(&s->windows, target->curw->idx);
574:
575: /* Fix up the last window stack. */
576: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
577: TAILQ_INIT(&s->lastw);
578: TAILQ_FOREACH(wl, &old_lastw, sentry) {
579: wl2 = winlink_find_by_index(&s->windows, wl->idx);
580: if (wl2 != NULL)
581: TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
582: }
583:
584: /* Then free the old winlinks list. */
585: while (!RB_EMPTY(&old_windows)) {
586: wl = RB_ROOT(&old_windows);
1.33 nicm 587: if (winlink_find_by_window_id(&s->windows, wl->window->id) == NULL)
588: notify_window_unlinked(s, wl->window);
1.13 nicm 589: winlink_remove(&old_windows, wl);
1.11 nicm 590: }
1.34 nicm 591: }
592:
593: /* Renumber the windows across winlinks attached to a specific session. */
594: void
595: session_renumber_windows(struct session *s)
596: {
597: struct winlink *wl, *wl1, *wl_new;
598: struct winlinks old_wins;
599: struct winlink_stack old_lastw;
600: int new_idx, new_curw_idx;
601:
602: /* Save and replace old window list. */
603: memcpy(&old_wins, &s->windows, sizeof old_wins);
604: RB_INIT(&s->windows);
605:
606: /* Start renumbering from the base-index if it's set. */
607: new_idx = options_get_number(&s->options, "base-index");
608: new_curw_idx = 0;
609:
610: /* Go through the winlinks and assign new indexes. */
611: RB_FOREACH(wl, winlinks, &old_wins) {
612: wl_new = winlink_add(&s->windows, new_idx);
613: winlink_set_window(wl_new, wl->window);
614: wl_new->flags |= wl->flags & WINLINK_ALERTFLAGS;
615:
616: if (wl == s->curw)
617: new_curw_idx = wl_new->idx;
618:
619: new_idx++;
620: }
621:
622: /* Fix the stack of last windows now. */
623: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
624: TAILQ_INIT(&s->lastw);
625: TAILQ_FOREACH(wl, &old_lastw, sentry) {
626: wl_new = winlink_find_by_index(&s->windows, wl->idx);
627: if (wl_new != NULL)
628: TAILQ_INSERT_TAIL(&s->lastw, wl_new, sentry);
629: }
630:
631: /* Set the current window. */
632: s->curw = winlink_find_by_index(&s->windows, new_curw_idx);
633:
634: /* Free the old winlinks (reducing window references too). */
635: RB_FOREACH_SAFE(wl, winlinks, &old_wins, wl1)
636: winlink_remove(&old_wins, wl);
1.1 nicm 637: }
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