Annotation of src/usr.bin/tmux/session.c, Revision 1.45
1.45 ! nicm 1: /* $OpenBSD: session.c,v 1.44 2014/05/13 08:08:32 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;
1.38 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));
71: }
72:
1.38 nicm 73: /* Find session by id. */
1.25 nicm 74: struct session *
1.38 nicm 75: session_find_by_id(u_int id)
1.25 nicm 76: {
1.1 nicm 77: struct session *s;
78:
1.25 nicm 79: RB_FOREACH(s, sessions, &sessions) {
1.38 nicm 80: if (s->id == id)
1.1 nicm 81: return (s);
82: }
83: return (NULL);
84: }
85:
86: /* Create a new session. */
87: struct session *
1.44 nicm 88: session_create(const char *name, int argc, char **argv, const char *path,
89: int cwd, struct environ *env, struct termios *tio, int idx, u_int sx,
90: u_int sy, char **cause)
1.1 nicm 91: {
92: struct session *s;
1.44 nicm 93: struct winlink *wl;
1.1 nicm 94:
95: s = xmalloc(sizeof *s);
1.7 nicm 96: s->references = 0;
1.1 nicm 97: s->flags = 0;
1.7 nicm 98:
1.12 nicm 99: if (gettimeofday(&s->creation_time, NULL) != 0)
1.9 nicm 100: fatal("gettimeofday failed");
1.27 nicm 101: session_update_activity(s);
1.7 nicm 102:
1.41 nicm 103: s->cwd = dup(cwd);
1.19 nicm 104:
1.1 nicm 105: s->curw = NULL;
1.11 nicm 106: TAILQ_INIT(&s->lastw);
1.1 nicm 107: RB_INIT(&s->windows);
1.7 nicm 108:
1.2 nicm 109: options_init(&s->options, &global_s_options);
1.3 nicm 110: environ_init(&s->environ);
111: if (env != NULL)
112: environ_copy(env, &s->environ);
1.8 nicm 113:
114: s->tio = NULL;
115: if (tio != NULL) {
116: s->tio = xmalloc(sizeof *s->tio);
117: memcpy(s->tio, tio, sizeof *s->tio);
118: }
1.1 nicm 119:
120: s->sx = sx;
121: s->sy = sy;
122:
1.32 nicm 123: if (name != NULL) {
1.1 nicm 124: s->name = xstrdup(name);
1.38 nicm 125: s->id = next_session_id++;
1.32 nicm 126: } else {
127: s->name = NULL;
128: do {
1.38 nicm 129: s->id = next_session_id++;
1.36 nicm 130: free (s->name);
1.38 nicm 131: xasprintf(&s->name, "%u", s->id);
1.32 nicm 132: } while (RB_FIND(sessions, &sessions, s) != NULL);
133: }
1.25 nicm 134: RB_INSERT(sessions, &sessions, s);
1.15 nicm 135:
1.44 nicm 136: if (argc >= 0) {
137: wl = session_new(s, NULL, argc, argv, path, cwd, idx, cause);
138: if (wl == NULL) {
1.11 nicm 139: session_destroy(s);
140: return (NULL);
141: }
142: session_select(s, RB_ROOT(&s->windows)->idx);
1.1 nicm 143: }
144:
145: log_debug("session %s created", s->name);
1.33 nicm 146: notify_session_created(s);
1.1 nicm 147:
148: return (s);
149: }
150:
151: /* Destroy a session. */
152: void
153: session_destroy(struct session *s)
154: {
1.33 nicm 155: struct winlink *wl;
1.39 nicm 156:
1.1 nicm 157: log_debug("session %s destroyed", s->name);
158:
1.25 nicm 159: RB_REMOVE(sessions, &sessions, s);
1.33 nicm 160: notify_session_closed(s);
1.1 nicm 161:
1.36 nicm 162: free(s->tio);
1.8 nicm 163:
1.11 nicm 164: session_group_remove(s);
1.3 nicm 165: environ_free(&s->environ);
1.1 nicm 166: options_free(&s->options);
167:
1.11 nicm 168: while (!TAILQ_EMPTY(&s->lastw))
169: winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
1.33 nicm 170: while (!RB_EMPTY(&s->windows)) {
171: wl = RB_ROOT(&s->windows);
172: notify_window_unlinked(s, wl->window);
173: winlink_remove(&s->windows, wl);
174: }
1.1 nicm 175:
1.41 nicm 176: close(s->cwd);
1.15 nicm 177:
1.25 nicm 178: RB_INSERT(sessions, &dead_sessions, s);
1.31 nicm 179: }
180:
1.42 nicm 181: /* Check a session name is valid: not empty and no colons or periods. */
1.31 nicm 182: int
183: session_check_name(const char *name)
184: {
1.42 nicm 185: return (*name != '\0' && name[strcspn(name, ":.")] == '\0');
1.27 nicm 186: }
187:
188: /* Update session active time. */
189: void
190: session_update_activity(struct session *s)
191: {
192: if (gettimeofday(&s->activity_time, NULL) != 0)
193: fatal("gettimeofday");
1.20 nicm 194: }
195:
196: /* Find the next usable session. */
197: struct session *
198: session_next_session(struct session *s)
199: {
200: struct session *s2;
201:
1.25 nicm 202: if (RB_EMPTY(&sessions) || !session_alive(s))
1.20 nicm 203: return (NULL);
204:
1.29 nicm 205: s2 = RB_NEXT(sessions, &sessions, s);
1.28 nicm 206: if (s2 == NULL)
207: s2 = RB_MIN(sessions, &sessions);
1.25 nicm 208: if (s2 == s)
209: return (NULL);
1.20 nicm 210: return (s2);
211: }
212:
213: /* Find the previous usable session. */
214: struct session *
215: session_previous_session(struct session *s)
216: {
217: struct session *s2;
218:
1.25 nicm 219: if (RB_EMPTY(&sessions) || !session_alive(s))
1.20 nicm 220: return (NULL);
221:
1.29 nicm 222: s2 = RB_PREV(sessions, &sessions, s);
1.28 nicm 223: if (s2 == NULL)
224: s2 = RB_MAX(sessions, &sessions);
1.25 nicm 225: if (s2 == s)
226: return (NULL);
1.20 nicm 227: return (s2);
1.1 nicm 228: }
229:
230: /* Create a new window on a session. */
231: struct winlink *
1.44 nicm 232: session_new(struct session *s, const char *name, int argc, char **argv,
1.43 nicm 233: const char *path, int cwd, int idx, char **cause)
1.1 nicm 234: {
235: struct window *w;
1.30 nicm 236: struct winlink *wl;
1.3 nicm 237: struct environ env;
1.6 nicm 238: const char *shell;
1.1 nicm 239: u_int hlimit;
240:
1.30 nicm 241: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
242: xasprintf(cause, "index in use: %d", idx);
243: return (NULL);
244: }
245:
1.3 nicm 246: environ_init(&env);
247: environ_copy(&global_environ, &env);
248: environ_copy(&s->environ, &env);
249: server_fill_environ(s, &env);
1.1 nicm 250:
1.6 nicm 251: shell = options_get_string(&s->options, "default-shell");
252: if (*shell == '\0' || areshell(shell))
253: shell = _PATH_BSHELL;
254:
1.1 nicm 255: hlimit = options_get_number(&s->options, "history-limit");
1.44 nicm 256: w = window_create(name, argc, argv, path, shell, cwd, &env, s->tio,
257: s->sx, s->sy, hlimit, cause);
1.3 nicm 258: if (w == NULL) {
1.30 nicm 259: winlink_remove(&s->windows, wl);
1.3 nicm 260: environ_free(&env);
1.1 nicm 261: return (NULL);
1.3 nicm 262: }
1.30 nicm 263: winlink_set_window(wl, w);
1.33 nicm 264: notify_window_linked(s, w);
1.3 nicm 265: environ_free(&env);
1.1 nicm 266:
267: if (options_get_number(&s->options, "set-remain-on-exit"))
268: options_set_number(&w->options, "remain-on-exit", 1);
269:
1.30 nicm 270: session_group_synchronize_from(s);
271: return (wl);
1.1 nicm 272: }
273:
274: /* Attach a window to a session. */
275: struct winlink *
276: session_attach(struct session *s, struct window *w, int idx, char **cause)
277: {
278: struct winlink *wl;
279:
1.30 nicm 280: if ((wl = winlink_add(&s->windows, idx)) == NULL) {
1.1 nicm 281: xasprintf(cause, "index in use: %d", idx);
1.30 nicm 282: return (NULL);
283: }
284: winlink_set_window(wl, w);
1.33 nicm 285: notify_window_linked(s, w);
1.30 nicm 286:
1.11 nicm 287: session_group_synchronize_from(s);
1.1 nicm 288: return (wl);
289: }
290:
291: /* Detach a window from a session. */
292: int
293: session_detach(struct session *s, struct winlink *wl)
294: {
295: if (s->curw == wl &&
296: session_last(s) != 0 && session_previous(s, 0) != 0)
297: session_next(s, 0);
298:
1.18 nicm 299: wl->flags &= ~WINLINK_ALERTFLAGS;
1.33 nicm 300: notify_window_unlinked(s, wl->window);
1.1 nicm 301: winlink_stack_remove(&s->lastw, wl);
302: winlink_remove(&s->windows, wl);
1.11 nicm 303: session_group_synchronize_from(s);
1.1 nicm 304: if (RB_EMPTY(&s->windows)) {
305: session_destroy(s);
306: return (1);
307: }
308: return (0);
309: }
310:
311: /* Return if session has window. */
1.18 nicm 312: struct winlink *
1.1 nicm 313: session_has(struct session *s, struct window *w)
314: {
315: struct winlink *wl;
316:
317: RB_FOREACH(wl, winlinks, &s->windows) {
318: if (wl->window == w)
1.18 nicm 319: return (wl);
1.1 nicm 320: }
1.18 nicm 321: return (NULL);
1.1 nicm 322: }
323:
324: struct winlink *
1.18 nicm 325: session_next_alert(struct winlink *wl)
1.1 nicm 326: {
327: while (wl != NULL) {
1.18 nicm 328: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 329: break;
1.14 nicm 330: wl = winlink_next(wl);
1.1 nicm 331: }
332: return (wl);
333: }
334:
335: /* Move session to next window. */
336: int
1.17 nicm 337: session_next(struct session *s, int alert)
1.1 nicm 338: {
339: struct winlink *wl;
340:
341: if (s->curw == NULL)
342: return (-1);
343:
1.14 nicm 344: wl = winlink_next(s->curw);
1.17 nicm 345: if (alert)
1.18 nicm 346: wl = session_next_alert(wl);
1.1 nicm 347: if (wl == NULL) {
348: wl = RB_MIN(winlinks, &s->windows);
1.18 nicm 349: if (alert && ((wl = session_next_alert(wl)) == NULL))
1.1 nicm 350: return (-1);
351: }
1.37 nicm 352: return (session_set_current(s, wl));
1.1 nicm 353: }
354:
355: struct winlink *
1.18 nicm 356: session_previous_alert(struct winlink *wl)
1.1 nicm 357: {
358: while (wl != NULL) {
1.18 nicm 359: if (wl->flags & WINLINK_ALERTFLAGS)
1.1 nicm 360: break;
1.14 nicm 361: wl = winlink_previous(wl);
1.1 nicm 362: }
363: return (wl);
364: }
365:
366: /* Move session to previous window. */
367: int
1.17 nicm 368: session_previous(struct session *s, int alert)
1.1 nicm 369: {
370: struct winlink *wl;
371:
372: if (s->curw == NULL)
373: return (-1);
374:
1.14 nicm 375: wl = winlink_previous(s->curw);
1.17 nicm 376: if (alert)
1.18 nicm 377: wl = session_previous_alert(wl);
1.1 nicm 378: if (wl == NULL) {
379: wl = RB_MAX(winlinks, &s->windows);
1.18 nicm 380: if (alert && (wl = session_previous_alert(wl)) == NULL)
1.1 nicm 381: return (-1);
382: }
1.37 nicm 383: return (session_set_current(s, wl));
1.1 nicm 384: }
385:
386: /* Move session to specific window. */
387: int
388: session_select(struct session *s, int idx)
389: {
390: struct winlink *wl;
391:
392: wl = winlink_find_by_index(&s->windows, idx);
1.37 nicm 393: return (session_set_current(s, wl));
1.1 nicm 394: }
395:
396: /* Move session to last used window. */
397: int
398: session_last(struct session *s)
399: {
400: struct winlink *wl;
401:
1.11 nicm 402: wl = TAILQ_FIRST(&s->lastw);
1.37 nicm 403: if (wl == NULL)
404: return (-1);
405: if (wl == s->curw)
406: return (1);
407:
408: return (session_set_current(s, wl));
409: }
410:
411: /* Set current winlink to wl .*/
412: int
413: session_set_current(struct session *s, struct winlink *wl)
414: {
1.1 nicm 415: if (wl == NULL)
416: return (-1);
417: if (wl == s->curw)
418: return (1);
419:
420: winlink_stack_remove(&s->lastw, wl);
421: winlink_stack_push(&s->lastw, s->curw);
422: s->curw = wl;
1.35 nicm 423: winlink_clear_flags(wl);
1.1 nicm 424: return (0);
1.11 nicm 425: }
426:
427: /* Find the session group containing a session. */
428: struct session_group *
429: session_group_find(struct session *target)
430: {
431: struct session_group *sg;
432: struct session *s;
433:
434: TAILQ_FOREACH(sg, &session_groups, entry) {
435: TAILQ_FOREACH(s, &sg->sessions, gentry) {
436: if (s == target)
437: return (sg);
438: }
439: }
440: return (NULL);
441: }
442:
443: /* Find session group index. */
444: u_int
445: session_group_index(struct session_group *sg)
446: {
447: struct session_group *sg2;
448: u_int i;
449:
450: i = 0;
451: TAILQ_FOREACH(sg2, &session_groups, entry) {
452: if (sg == sg2)
453: return (i);
454: i++;
455: }
456:
457: fatalx("session group not found");
458: }
459:
460: /*
461: * Add a session to the session group containing target, creating it if
1.15 nicm 462: * necessary.
1.11 nicm 463: */
464: void
465: session_group_add(struct session *target, struct session *s)
466: {
467: struct session_group *sg;
468:
469: if ((sg = session_group_find(target)) == NULL) {
470: sg = xmalloc(sizeof *sg);
471: TAILQ_INSERT_TAIL(&session_groups, sg, entry);
472: TAILQ_INIT(&sg->sessions);
473: TAILQ_INSERT_TAIL(&sg->sessions, target, gentry);
474: }
475: TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
476: }
477:
478: /* Remove a session from its group and destroy the group if empty. */
479: void
480: session_group_remove(struct session *s)
481: {
482: struct session_group *sg;
483:
484: if ((sg = session_group_find(s)) == NULL)
485: return;
486: TAILQ_REMOVE(&sg->sessions, s, gentry);
487: if (TAILQ_NEXT(TAILQ_FIRST(&sg->sessions), gentry) == NULL)
488: TAILQ_REMOVE(&sg->sessions, TAILQ_FIRST(&sg->sessions), gentry);
489: if (TAILQ_EMPTY(&sg->sessions)) {
490: TAILQ_REMOVE(&session_groups, sg, entry);
1.36 nicm 491: free(sg);
1.11 nicm 492: }
493: }
494:
1.45 ! nicm 495: /* Count number of sessions in session group. */
! 496: u_int
! 497: session_group_count(struct session_group *sg)
! 498: {
! 499: struct session *s;
! 500: u_int n;
! 501:
! 502: n = 0;
! 503: TAILQ_FOREACH(s, &sg->sessions, gentry)
! 504: n++;
! 505: return (n);
! 506: }
! 507:
1.11 nicm 508: /* Synchronize a session to its session group. */
509: void
510: session_group_synchronize_to(struct session *s)
511: {
512: struct session_group *sg;
513: struct session *target;
514:
515: if ((sg = session_group_find(s)) == NULL)
516: return;
517:
518: target = NULL;
519: TAILQ_FOREACH(target, &sg->sessions, gentry) {
520: if (target != s)
521: break;
522: }
523: session_group_synchronize1(target, s);
524: }
525:
526: /* Synchronize a session group to a session. */
527: void
528: session_group_synchronize_from(struct session *target)
529: {
530: struct session_group *sg;
531: struct session *s;
532:
533: if ((sg = session_group_find(target)) == NULL)
534: return;
535:
536: TAILQ_FOREACH(s, &sg->sessions, gentry) {
537: if (s != target)
538: session_group_synchronize1(target, s);
539: }
540: }
541:
542: /*
543: * Synchronize a session with a target session. This means destroying all
544: * winlinks then recreating them, then updating the current window, last window
545: * stack and alerts.
546: */
547: void
548: session_group_synchronize1(struct session *target, struct session *s)
549: {
550: struct winlinks old_windows, *ww;
551: struct winlink_stack old_lastw;
552: struct winlink *wl, *wl2;
553:
554: /* Don't do anything if the session is empty (it'll be destroyed). */
555: ww = &target->windows;
556: if (RB_EMPTY(ww))
557: return;
558:
559: /* If the current window has vanished, move to the next now. */
1.16 nicm 560: if (s->curw != NULL &&
561: winlink_find_by_index(ww, s->curw->idx) == NULL &&
562: session_last(s) != 0 && session_previous(s, 0) != 0)
563: session_next(s, 0);
1.11 nicm 564:
565: /* Save the old pointer and reset it. */
566: memcpy(&old_windows, &s->windows, sizeof old_windows);
567: RB_INIT(&s->windows);
568:
569: /* Link all the windows from the target. */
1.18 nicm 570: RB_FOREACH(wl, winlinks, ww) {
1.30 nicm 571: wl2 = winlink_add(&s->windows, wl->idx);
572: winlink_set_window(wl2, wl->window);
1.33 nicm 573: notify_window_linked(s, wl2->window);
1.18 nicm 574: wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
575: }
1.11 nicm 576:
577: /* Fix up the current window. */
578: if (s->curw != NULL)
579: s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
580: else
581: s->curw = winlink_find_by_index(&s->windows, target->curw->idx);
582:
583: /* Fix up the last window stack. */
584: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
585: TAILQ_INIT(&s->lastw);
586: TAILQ_FOREACH(wl, &old_lastw, sentry) {
587: wl2 = winlink_find_by_index(&s->windows, wl->idx);
588: if (wl2 != NULL)
589: TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
590: }
591:
592: /* Then free the old winlinks list. */
593: while (!RB_EMPTY(&old_windows)) {
594: wl = RB_ROOT(&old_windows);
1.45 ! nicm 595: wl2 = winlink_find_by_window_id(&s->windows, wl->window->id);
! 596: if (wl2 == NULL)
! 597: notify_window_unlinked(s, wl->window);
1.13 nicm 598: winlink_remove(&old_windows, wl);
1.11 nicm 599: }
1.34 nicm 600: }
601:
602: /* Renumber the windows across winlinks attached to a specific session. */
603: void
604: session_renumber_windows(struct session *s)
605: {
606: struct winlink *wl, *wl1, *wl_new;
607: struct winlinks old_wins;
608: struct winlink_stack old_lastw;
609: int new_idx, new_curw_idx;
610:
611: /* Save and replace old window list. */
612: memcpy(&old_wins, &s->windows, sizeof old_wins);
613: RB_INIT(&s->windows);
614:
615: /* Start renumbering from the base-index if it's set. */
616: new_idx = options_get_number(&s->options, "base-index");
617: new_curw_idx = 0;
618:
619: /* Go through the winlinks and assign new indexes. */
620: RB_FOREACH(wl, winlinks, &old_wins) {
621: wl_new = winlink_add(&s->windows, new_idx);
622: winlink_set_window(wl_new, wl->window);
623: wl_new->flags |= wl->flags & WINLINK_ALERTFLAGS;
624:
625: if (wl == s->curw)
626: new_curw_idx = wl_new->idx;
627:
628: new_idx++;
629: }
630:
631: /* Fix the stack of last windows now. */
632: memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
633: TAILQ_INIT(&s->lastw);
634: TAILQ_FOREACH(wl, &old_lastw, sentry) {
1.40 nicm 635: wl_new = winlink_find_by_window(&s->windows, wl->window);
1.34 nicm 636: if (wl_new != NULL)
637: TAILQ_INSERT_TAIL(&s->lastw, wl_new, sentry);
638: }
639:
640: /* Set the current window. */
641: s->curw = winlink_find_by_index(&s->windows, new_curw_idx);
642:
643: /* Free the old winlinks (reducing window references too). */
644: RB_FOREACH_SAFE(wl, winlinks, &old_wins, wl1)
645: winlink_remove(&old_wins, wl);
1.1 nicm 646: }
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