session.c

   1 /* $OpenBSD$ */
   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
  22 #include <paths.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25 #include <unistd.h>
  26 #include <time.h>
  27
  28 #include "tmux.h"
  29
  30 /* Global session list. */
  31 struct sessions sessions;
  32 struct sessions dead_sessions;
  33 u_int           next_session;
  34 struct session_groups session_groups;
  35
  36 struct winlink *session_next_alert(struct winlink *);
  37 struct winlink *session_previous_alert(struct winlink *);
  38
  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
  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 {
  54         struct session *s_loop;
  55
  56         RB_FOREACH(s_loop, sessions, &sessions) {
  57                 if (s_loop == s)
  58                         return (1);
  59         }
  60         return (0);
  61 }
  62
  63 /* Find session by name. */
  64 struct session *
  65 session_find(const char *name)
  66 {
  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 {
  77         struct session  *s;
  78
  79         RB_FOREACH(s, sessions, &sessions) {
  80                 if (s->idx == idx)
  81                         return (s);
  82         }
  83         return (NULL);
  84 }
  85
  86 /* Create a new session. */
  87 struct session *
  88 session_create(const char *name, const char *cmd, const char *cwd,
  89     struct environ *env, struct termios *tio, int idx, u_int sx, u_int sy,
  90     char **cause)
  91 {
  92         struct session  *s;
  93
  94         s = xmalloc(sizeof *s);
  95         s->references = 0;
  96         s->flags = 0;
  97
  98         if (gettimeofday(&s->creation_time, NULL) != 0)
  99                 fatal("gettimeofday failed");
 100         session_update_activity(s);
 101
 102         s->cwd = xstrdup(cwd);
 103
 104         s->curw = NULL;
 105         TAILQ_INIT(&s->lastw);
 106         RB_INIT(&s->windows);
 107
 108         options_init(&s->options, &global_s_options);
 109         environ_init(&s->environ);
 110         if (env != NULL)
 111                 environ_copy(env, &s->environ);
 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         }
 118
 119         s->sx = sx;
 120         s->sy = sy;
 121
 122         if (name != NULL) {
 123                 s->name = xstrdup(name);
 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         }
 134         RB_INSERT(sessions, &sessions, s);
 135
 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);
 142         }
 143
 144         log_debug("session %s created", s->name);
 145
 146         return (s);
 147 }
 148
 149 /* Destroy a session. */
 150 void
 151 session_destroy(struct session *s)
 152 {
 153         log_debug("session %s destroyed", s->name);
 154
 155         RB_REMOVE(sessions, &sessions, s);
 156
 157         if (s->tio != NULL)
 158                 xfree(s->tio);
 159
 160         session_group_remove(s);
 161         environ_free(&s->environ);
 162         options_free(&s->options);
 163
 164         while (!TAILQ_EMPTY(&s->lastw))
 165                 winlink_stack_remove(&s->lastw, TAILQ_FIRST(&s->lastw));
 166         while (!RB_EMPTY(&s->windows))
 167                 winlink_remove(&s->windows, RB_ROOT(&s->windows));
 168
 169         xfree(s->cwd);
 170
 171         RB_INSERT(sessions, &dead_sessions, s);
 172 }
 173
 174 /* Check a session name is valid: not empty and no colons. */
 175 int
 176 session_check_name(const char *name)
 177 {
 178         return (*name != '\0' && strchr(name, ':') == NULL);
 179 }
 180
 181 /* Update session active time. */
 182 void
 183 session_update_activity(struct session *s)
 184 {
 185         if (gettimeofday(&s->activity_time, NULL) != 0)
 186                 fatal("gettimeofday");
 187 }
 188
 189 /* Find the next usable session. */
 190 struct session *
 191 session_next_session(struct session *s)
 192 {
 193         struct session *s2;
 194
 195         if (RB_EMPTY(&sessions) || !session_alive(s))
 196                 return (NULL);
 197
 198         s2 = RB_NEXT(sessions, &sessions, s);
 199         if (s2 == NULL)
 200                 s2 = RB_MIN(sessions, &sessions);
 201         if (s2 == s)
 202                 return (NULL);
 203         return (s2);
 204 }
 205
 206 /* Find the previous usable session. */
 207 struct session *
 208 session_previous_session(struct session *s)
 209 {
 210         struct session *s2;
 211
 212         if (RB_EMPTY(&sessions) || !session_alive(s))
 213                 return (NULL);
 214
 215         s2 = RB_PREV(sessions, &sessions, s);
 216         if (s2 == NULL)
 217                 s2 = RB_MAX(sessions, &sessions);
 218         if (s2 == s)
 219                 return (NULL);
 220         return (s2);
 221 }
 222
 223 /* Create a new window on a session. */
 224 struct winlink *
 225 session_new(struct session *s,
 226     const char *name, const char *cmd, const char *cwd, int idx, char **cause)
 227 {
 228         struct window   *w;
 229         struct winlink  *wl;
 230         struct environ   env;
 231         const char      *shell;
 232         u_int            hlimit;
 233
 234         if ((wl = winlink_add(&s->windows, idx)) == NULL) {
 235                 xasprintf(cause, "index in use: %d", idx);
 236                 return (NULL);
 237         }
 238
 239         environ_init(&env);
 240         environ_copy(&global_environ, &env);
 241         environ_copy(&s->environ, &env);
 242         server_fill_environ(s, &env);
 243
 244         shell = options_get_string(&s->options, "default-shell");
 245         if (*shell == '\0' || areshell(shell))
 246                 shell = _PATH_BSHELL;
 247
 248         hlimit = options_get_number(&s->options, "history-limit");
 249         w = window_create(
 250             name, cmd, shell, cwd, &env, s->tio, s->sx, s->sy, hlimit, cause);
 251         if (w == NULL) {
 252                 winlink_remove(&s->windows, wl);
 253                 environ_free(&env);
 254                 return (NULL);
 255         }
 256         winlink_set_window(wl, w);
 257         environ_free(&env);
 258
 259         if (options_get_number(&s->options, "set-remain-on-exit"))
 260                 options_set_number(&w->options, "remain-on-exit", 1);
 261
 262         session_group_synchronize_from(s);
 263         return (wl);
 264 }
 265
 266 /* Attach a window to a session. */
 267 struct winlink *
 268 session_attach(struct session *s, struct window *w, int idx, char **cause)
 269 {
 270         struct winlink  *wl;
 271
 272         if ((wl = winlink_add(&s->windows, idx)) == NULL) {
 273                 xasprintf(cause, "index in use: %d", idx);
 274                 return (NULL);
 275         }
 276         winlink_set_window(wl, w);
 277
 278         session_group_synchronize_from(s);
 279         return (wl);
 280 }
 281
 282 /* Detach a window from a session. */
 283 int
 284 session_detach(struct session *s, struct winlink *wl)
 285 {
 286         if (s->curw == wl &&
 287             session_last(s) != 0 && session_previous(s, 0) != 0)
 288                 session_next(s, 0);
 289
 290         wl->flags &= ~WINLINK_ALERTFLAGS;
 291         winlink_stack_remove(&s->lastw, wl);
 292         winlink_remove(&s->windows, wl);
 293         session_group_synchronize_from(s);
 294         if (RB_EMPTY(&s->windows)) {
 295                 session_destroy(s);
 296                 return (1);
 297         }
 298         return (0);
 299 }
 300
 301 /* Return if session has window. */
 302 struct winlink *
 303 session_has(struct session *s, struct window *w)
 304 {
 305         struct winlink  *wl;
 306
 307         RB_FOREACH(wl, winlinks, &s->windows) {
 308                 if (wl->window == w)
 309                         return (wl);
 310         }
 311         return (NULL);
 312 }
 313
 314 struct winlink *
 315 session_next_alert(struct winlink *wl)
 316 {
 317         while (wl != NULL) {
 318                 if (wl->flags & WINLINK_ALERTFLAGS)
 319                         break;
 320                 wl = winlink_next(wl);
 321         }
 322         return (wl);
 323 }
 324
 325 /* Move session to next window. */
 326 int
 327 session_next(struct session *s, int alert)
 328 {
 329         struct winlink  *wl;
 330
 331         if (s->curw == NULL)
 332                 return (-1);
 333
 334         wl = winlink_next(s->curw);
 335         if (alert)
 336                 wl = session_next_alert(wl);
 337         if (wl == NULL) {
 338                 wl = RB_MIN(winlinks, &s->windows);
 339                 if (alert && ((wl = session_next_alert(wl)) == NULL))
 340                         return (-1);
 341         }
 342         if (wl == s->curw)
 343                 return (1);
 344         winlink_stack_remove(&s->lastw, wl);
 345         winlink_stack_push(&s->lastw, s->curw);
 346         s->curw = wl;
 347         wl->flags &= ~WINLINK_ALERTFLAGS;
 348         return (0);
 349 }
 350
 351 struct winlink *
 352 session_previous_alert(struct winlink *wl)
 353 {
 354         while (wl != NULL) {
 355                 if (wl->flags & WINLINK_ALERTFLAGS)
 356                         break;
 357                 wl = winlink_previous(wl);
 358         }
 359         return (wl);
 360 }
 361
 362 /* Move session to previous window. */
 363 int
 364 session_previous(struct session *s, int alert)
 365 {
 366         struct winlink  *wl;
 367
 368         if (s->curw == NULL)
 369                 return (-1);
 370
 371         wl = winlink_previous(s->curw);
 372         if (alert)
 373                 wl = session_previous_alert(wl);
 374         if (wl == NULL) {
 375                 wl = RB_MAX(winlinks, &s->windows);
 376                 if (alert && (wl = session_previous_alert(wl)) == NULL)
 377                         return (-1);
 378         }
 379         if (wl == s->curw)
 380                 return (1);
 381         winlink_stack_remove(&s->lastw, wl);
 382         winlink_stack_push(&s->lastw, s->curw);
 383         s->curw = wl;
 384         wl->flags &= ~WINLINK_ALERTFLAGS;
 385         return (0);
 386 }
 387
 388 /* Move session to specific window. */
 389 int
 390 session_select(struct session *s, int idx)
 391 {
 392         struct winlink  *wl;
 393
 394         wl = winlink_find_by_index(&s->windows, idx);
 395         if (wl == NULL)
 396                 return (-1);
 397         if (wl == s->curw)
 398                 return (1);
 399         winlink_stack_remove(&s->lastw, wl);
 400         winlink_stack_push(&s->lastw, s->curw);
 401         s->curw = wl;
 402         wl->flags &= ~WINLINK_ALERTFLAGS;
 403         return (0);
 404 }
 405
 406 /* Move session to last used window. */
 407 int
 408 session_last(struct session *s)
 409 {
 410         struct winlink  *wl;
 411
 412         wl = TAILQ_FIRST(&s->lastw);
 413         if (wl == NULL)
 414                 return (-1);
 415         if (wl == s->curw)
 416                 return (1);
 417
 418         winlink_stack_remove(&s->lastw, wl);
 419         winlink_stack_push(&s->lastw, s->curw);
 420         s->curw = wl;
 421         wl->flags &= ~WINLINK_ALERTFLAGS;
 422         return (0);
 423 }
 424
 425 /* Find the session group containing a session. */
 426 struct session_group *
 427 session_group_find(struct session *target)
 428 {
 429         struct session_group    *sg;
 430         struct session          *s;
 431
 432         TAILQ_FOREACH(sg, &session_groups, entry) {
 433                 TAILQ_FOREACH(s, &sg->sessions, gentry) {
 434                         if (s == target)
 435                                 return (sg);
 436                 }
 437         }
 438         return (NULL);
 439 }
 440
 441 /* Find session group index. */
 442 u_int
 443 session_group_index(struct session_group *sg)
 444 {
 445         struct session_group   *sg2;
 446         u_int                   i;
 447
 448         i = 0;
 449         TAILQ_FOREACH(sg2, &session_groups, entry) {
 450                 if (sg == sg2)
 451                         return (i);
 452                 i++;
 453         }
 454
 455         fatalx("session group not found");
 456 }
 457
 458 /*
 459  * Add a session to the session group containing target, creating it if
 460  * necessary.
 461  */
 462 void
 463 session_group_add(struct session *target, struct session *s)
 464 {
 465         struct session_group    *sg;
 466
 467         if ((sg = session_group_find(target)) == NULL) {
 468                 sg = xmalloc(sizeof *sg);
 469                 TAILQ_INSERT_TAIL(&session_groups, sg, entry);
 470                 TAILQ_INIT(&sg->sessions);
 471                 TAILQ_INSERT_TAIL(&sg->sessions, target, gentry);
 472         }
 473         TAILQ_INSERT_TAIL(&sg->sessions, s, gentry);
 474 }
 475
 476 /* Remove a session from its group and destroy the group if empty. */
 477 void
 478 session_group_remove(struct session *s)
 479 {
 480         struct session_group    *sg;
 481
 482         if ((sg = session_group_find(s)) == NULL)
 483                 return;
 484         TAILQ_REMOVE(&sg->sessions, s, gentry);
 485         if (TAILQ_NEXT(TAILQ_FIRST(&sg->sessions), gentry) == NULL)
 486                 TAILQ_REMOVE(&sg->sessions, TAILQ_FIRST(&sg->sessions), gentry);
 487         if (TAILQ_EMPTY(&sg->sessions)) {
 488                 TAILQ_REMOVE(&session_groups, sg, entry);
 489                 xfree(sg);
 490         }
 491 }
 492
 493 /* Synchronize a session to its session group. */
 494 void
 495 session_group_synchronize_to(struct session *s)
 496 {
 497         struct session_group    *sg;
 498         struct session          *target;
 499
 500         if ((sg = session_group_find(s)) == NULL)
 501                 return;
 502
 503         target = NULL;
 504         TAILQ_FOREACH(target, &sg->sessions, gentry) {
 505                 if (target != s)
 506                         break;
 507         }
 508         session_group_synchronize1(target, s);
 509 }
 510
 511 /* Synchronize a session group to a session. */
 512 void
 513 session_group_synchronize_from(struct session *target)
 514 {
 515         struct session_group    *sg;
 516         struct session          *s;
 517
 518         if ((sg = session_group_find(target)) == NULL)
 519                 return;
 520
 521         TAILQ_FOREACH(s, &sg->sessions, gentry) {
 522                 if (s != target)
 523                         session_group_synchronize1(target, s);
 524         }
 525 }
 526
 527 /*
 528  * Synchronize a session with a target session. This means destroying all
 529  * winlinks then recreating them, then updating the current window, last window
 530  * stack and alerts.
 531  */
 532 void
 533 session_group_synchronize1(struct session *target, struct session *s)
 534 {
 535         struct winlinks          old_windows, *ww;
 536         struct winlink_stack     old_lastw;
 537         struct winlink          *wl, *wl2;
 538
 539         /* Don't do anything if the session is empty (it'll be destroyed). */
 540         ww = &target->windows;
 541         if (RB_EMPTY(ww))
 542                 return;
 543
 544         /* If the current window has vanished, move to the next now. */
 545         if (s->curw != NULL &&
 546             winlink_find_by_index(ww, s->curw->idx) == NULL &&
 547             session_last(s) != 0 && session_previous(s, 0) != 0)
 548                 session_next(s, 0);
 549
 550         /* Save the old pointer and reset it. */
 551         memcpy(&old_windows, &s->windows, sizeof old_windows);
 552         RB_INIT(&s->windows);
 553
 554         /* Link all the windows from the target. */
 555         RB_FOREACH(wl, winlinks, ww) {
 556                 wl2 = winlink_add(&s->windows, wl->idx);
 557                 winlink_set_window(wl2, wl->window);
 558                 wl2->flags |= wl->flags & WINLINK_ALERTFLAGS;
 559         }
 560
 561         /* Fix up the current window. */
 562         if (s->curw != NULL)
 563                 s->curw = winlink_find_by_index(&s->windows, s->curw->idx);
 564         else
 565                 s->curw = winlink_find_by_index(&s->windows, target->curw->idx);
 566
 567         /* Fix up the last window stack. */
 568         memcpy(&old_lastw, &s->lastw, sizeof old_lastw);
 569         TAILQ_INIT(&s->lastw);
 570         TAILQ_FOREACH(wl, &old_lastw, sentry) {
 571                 wl2 = winlink_find_by_index(&s->windows, wl->idx);
 572                 if (wl2 != NULL)
 573                         TAILQ_INSERT_TAIL(&s->lastw, wl2, sentry);
 574         }
 575
 576         /* Then free the old winlinks list. */
 577         while (!RB_EMPTY(&old_windows)) {
 578                 wl = RB_ROOT(&old_windows);
 579                 winlink_remove(&old_windows, wl);
 580         }
 581 }