tmux.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/stat.h>
  21
  22 #include <errno.h>
  23 #include <event.h>
  24 #include <paths.h>
  25 #include <pwd.h>
  26 #include <signal.h>
  27 #include <stdlib.h>
  28 #include <string.h>
  29 #include <syslog.h>
  30 #include <unistd.h>
  31
  32 #include "tmux.h"
  33
  34 #ifdef DEBUG
  35 extern char     *malloc_options;
  36 #endif
  37
  38 char            *cfg_file;
  39 struct options   global_options;        /* server options */
  40 struct options   global_s_options;      /* session options */
  41 struct options   global_w_options;      /* window options */
  42 struct environ   global_environ;
  43
  44 int              debug_level;
  45 time_t           start_time;
  46 char            *socket_path;
  47 int              login_shell;
  48
  49 __dead void      usage(void);
  50 void             fill_session(struct msg_command_data *);
  51 char            *makesockpath(const char *);
  52 __dead void      shell_exec(const char *, const char *);
  53
  54 struct imsgbuf  *main_ibuf;
  55 struct event     main_ev_sigterm;
  56 int              main_exitval;
  57
  58 void             main_set_signals(void);
  59 void             main_clear_signals(void);
  60 void             main_signal(int, short, unused void *);
  61 void             main_callback(int, short, void *);
  62 void             main_dispatch(const char *);
  63
  64 __dead void
  65 usage(void)
  66 {
  67         fprintf(stderr,
  68             "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
  69             "            [-S socket-path] [command [flags]]\n",
  70             __progname);
  71         exit(1);
  72 }
  73
  74 void
  75 logfile(const char *name)
  76 {
  77         char    *path;
  78
  79         log_close();
  80         if (debug_level > 0) {
  81                 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
  82                 log_open_file(debug_level, path);
  83                 xfree(path);
  84         }
  85 }
  86
  87 const char *
  88 getshell(void)
  89 {
  90         struct passwd   *pw;
  91         const char      *shell;
  92
  93         shell = getenv("SHELL");
  94         if (checkshell(shell))
  95                 return (shell);
  96
  97         pw = getpwuid(getuid());
  98         if (pw != NULL && checkshell(pw->pw_shell))
  99                 return (pw->pw_shell);
 100
 101         return (_PATH_BSHELL);
 102 }
 103
 104 int
 105 checkshell(const char *shell)
 106 {
 107         if (shell == NULL || *shell == '\0' || areshell(shell))
 108                 return (0);
 109         if (access(shell, X_OK) != 0)
 110                 return (0);
 111         return (1);
 112 }
 113
 114 int
 115 areshell(const char *shell)
 116 {
 117         const char      *progname, *ptr;
 118
 119         if ((ptr = strrchr(shell, '/')) != NULL)
 120                 ptr++;
 121         else
 122                 ptr = shell;
 123         progname = __progname;
 124         if (*progname == '-')
 125                 progname++;
 126         if (strcmp(ptr, progname) == 0)
 127                 return (1);
 128         return (0);
 129 }
 130
 131 void
 132 fill_session(struct msg_command_data *data)
 133 {
 134         char            *env, *ptr1, *ptr2, buf[256];
 135         size_t           len;
 136         const char      *errstr;
 137         long long        ll;
 138
 139         data->pid = -1;
 140         if ((env = getenv("TMUX")) == NULL)
 141                 return;
 142
 143         if ((ptr2 = strrchr(env, ',')) == NULL || ptr2 == env)
 144                 return;
 145         for (ptr1 = ptr2 - 1; ptr1 > env && *ptr1 != ','; ptr1--)
 146                 ;
 147         if (*ptr1 != ',')
 148                 return;
 149         ptr1++;
 150         ptr2++;
 151
 152         len = ptr2 - ptr1 - 1;
 153         if (len > (sizeof buf) - 1)
 154                 return;
 155         memcpy(buf, ptr1, len);
 156         buf[len] = '\0';
 157
 158         ll = strtonum(buf, 0, LONG_MAX, &errstr);
 159         if (errstr != NULL)
 160                 return;
 161         data->pid = ll;
 162
 163         ll = strtonum(ptr2, 0, UINT_MAX, &errstr);
 164         if (errstr != NULL)
 165                 return;
 166         data->idx = ll;
 167 }
 168
 169 char *
 170 makesockpath(const char *label)
 171 {
 172         char            base[MAXPATHLEN], *path;
 173         struct stat     sb;
 174         u_int           uid;
 175
 176         uid = getuid();
 177         xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid);
 178
 179         if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
 180                 return (NULL);
 181
 182         if (lstat(base, &sb) != 0)
 183                 return (NULL);
 184         if (!S_ISDIR(sb.st_mode)) {
 185                 errno = ENOTDIR;
 186                 return (NULL);
 187         }
 188         if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
 189                 errno = EACCES;
 190                 return (NULL);
 191         }
 192
 193         xasprintf(&path, "%s/%s", base, label);
 194         return (path);
 195 }
 196
 197 __dead void
 198 shell_exec(const char *shell, const char *shellcmd)
 199 {
 200         const char      *shellname, *ptr;
 201         char            *argv0;
 202
 203         ptr = strrchr(shell, '/');
 204         if (ptr != NULL && *(ptr + 1) != '\0')
 205                 shellname = ptr + 1;
 206         else
 207                 shellname = shell;
 208         if (login_shell)
 209                 xasprintf(&argv0, "-%s", shellname);
 210         else
 211                 xasprintf(&argv0, "%s", shellname);
 212         setenv("SHELL", shell, 1);
 213
 214         execl(shell, argv0, "-c", shellcmd, (char *) NULL);
 215         fatal("execl failed");
 216 }
 217
 218 int
 219 main(int argc, char **argv)
 220 {
 221         struct cmd_list         *cmdlist;
 222         struct cmd              *cmd;
 223         enum msgtype             msg;
 224         struct passwd           *pw;
 225         struct options          *oo, *so, *wo;
 226         struct keylist          *keylist;
 227         struct msg_command_data  cmddata;
 228         char                    *s, *shellcmd, *path, *label, *home, *cause;
 229         char                     cwd[MAXPATHLEN], **var;
 230         void                    *buf;
 231         size_t                   len;
 232         int                      opt, flags, quiet = 0, cmdflags = 0;
 233         short                    events;
 234
 235 #ifdef DEBUG
 236         malloc_options = (char *) "AFGJPX";
 237 #endif
 238
 239         flags = 0;
 240         shellcmd = label = path = NULL;
 241         login_shell = (**argv == '-');
 242         while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
 243                 switch (opt) {
 244                 case '2':
 245                         flags |= IDENTIFY_256COLOURS;
 246                         flags &= ~IDENTIFY_88COLOURS;
 247                         break;
 248                 case '8':
 249                         flags |= IDENTIFY_88COLOURS;
 250                         flags &= ~IDENTIFY_256COLOURS;
 251                         break;
 252                 case 'c':
 253                         if (shellcmd != NULL)
 254                                 xfree(shellcmd);
 255                         shellcmd = xstrdup(optarg);
 256                         break;
 257                 case 'f':
 258                         if (cfg_file != NULL)
 259                                 xfree(cfg_file);
 260                         cfg_file = xstrdup(optarg);
 261                         break;
 262                 case 'l':
 263                         login_shell = 1;
 264                         break;
 265                 case 'L':
 266                         if (label != NULL)
 267                                 xfree(label);
 268                         label = xstrdup(optarg);
 269                         break;
 270                 case 'q':
 271                         quiet = 1;
 272                         break;
 273                 case 'S':
 274                         if (path != NULL)
 275                                 xfree(path);
 276                         path = xstrdup(optarg);
 277                         break;
 278                 case 'u':
 279                         flags |= IDENTIFY_UTF8;
 280                         break;
 281                 case 'v':
 282                         debug_level++;
 283                         break;
 284                 default:
 285                         usage();
 286                 }
 287         }
 288         argc -= optind;
 289         argv += optind;
 290
 291         if (shellcmd != NULL && argc != 0)
 292                 usage();
 293
 294         log_open_tty(debug_level);
 295
 296         if (!(flags & IDENTIFY_UTF8)) {
 297                 /*
 298                  * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
 299                  * exist (in that order) to contain UTF-8, it is a safe
 300                  * assumption that either they are using a UTF-8 terminal, or
 301                  * if not they know that output from UTF-8-capable programs may
 302                  * be wrong.
 303                  */
 304                 if ((s = getenv("LC_ALL")) == NULL) {
 305                         if ((s = getenv("LC_CTYPE")) == NULL)
 306                                 s = getenv("LANG");
 307                 }
 308                 if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
 309                     strcasestr(s, "UTF8") != NULL))
 310                         flags |= IDENTIFY_UTF8;
 311         }
 312
 313         environ_init(&global_environ);
 314         for (var = environ; *var != NULL; var++)
 315                 environ_put(&global_environ, *var);
 316
 317         options_init(&global_options, NULL);
 318         oo = &global_options;
 319         options_set_number(oo, "quiet", quiet);
 320         options_set_number(oo, "escape-time", 500);
 321
 322         options_init(&global_s_options, NULL);
 323         so = &global_s_options;
 324         options_set_number(so, "base-index", 0);
 325         options_set_number(so, "bell-action", BELL_ANY);
 326         options_set_number(so, "buffer-limit", 9);
 327         options_set_string(so, "default-command", "%s", "");
 328         options_set_string(so, "default-shell", "%s", getshell());
 329         options_set_string(so, "default-terminal", "screen");
 330         options_set_number(so, "display-panes-colour", 4);
 331         options_set_number(so, "display-panes-time", 1000);
 332         options_set_number(so, "display-time", 750);
 333         options_set_number(so, "history-limit", 2000);
 334         options_set_number(so, "lock-after-time", 0);
 335         options_set_string(so, "lock-command", "lock -np");
 336         options_set_number(so, "lock-server", 1);
 337         options_set_number(so, "message-attr", 0);
 338         options_set_number(so, "message-bg", 3);
 339         options_set_number(so, "message-fg", 0);
 340         options_set_number(so, "message-limit", 20);
 341         options_set_number(so, "mouse-select-pane", 0);
 342         options_set_number(so, "pane-active-border-bg", 2);
 343         options_set_number(so, "pane-active-border-fg", 8);
 344         options_set_number(so, "pane-border-bg", 8);
 345         options_set_number(so, "pane-border-fg", 8);
 346         options_set_number(so, "repeat-time", 500);
 347         options_set_number(so, "set-remain-on-exit", 0);
 348         options_set_number(so, "set-titles", 0);
 349         options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\"");
 350         options_set_number(so, "status", 1);
 351         options_set_number(so, "status-attr", 0);
 352         options_set_number(so, "status-bg", 2);
 353         options_set_number(so, "status-fg", 0);
 354         options_set_number(so, "status-interval", 15);
 355         options_set_number(so, "status-justify", 0);
 356         options_set_number(so, "status-keys", MODEKEY_EMACS);
 357         options_set_string(so, "status-left", "[#S]");
 358         options_set_number(so, "status-left-attr", 0);
 359         options_set_number(so, "status-left-bg", 8);
 360         options_set_number(so, "status-left-fg", 8);
 361         options_set_number(so, "status-left-length", 10);
 362         options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y");
 363         options_set_number(so, "status-right-attr", 0);
 364         options_set_number(so, "status-right-bg", 8);
 365         options_set_number(so, "status-right-fg", 8);
 366         options_set_number(so, "status-right-length", 40);
 367         options_set_string(so, "terminal-overrides",
 368             "*88col*:colors=88,*256col*:colors=256");
 369         options_set_string(so, "update-environment", "DISPLAY "
 370             "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION");
 371         options_set_number(so, "visual-activity", 0);
 372         options_set_number(so, "visual-bell", 0);
 373         options_set_number(so, "visual-content", 0);
 374
 375         keylist = xmalloc(sizeof *keylist);
 376         ARRAY_INIT(keylist);
 377         ARRAY_ADD(keylist, '\002');
 378         options_set_data(so, "prefix", keylist, xfree);
 379
 380         options_init(&global_w_options, NULL);
 381         wo = &global_w_options;
 382         options_set_number(wo, "aggressive-resize", 0);
 383         options_set_number(wo, "automatic-rename", 1);
 384         options_set_number(wo, "clock-mode-colour", 4);
 385         options_set_number(wo, "clock-mode-style", 1);
 386         options_set_number(wo, "force-height", 0);
 387         options_set_number(wo, "force-width", 0);
 388         options_set_number(wo, "main-pane-height", 24);
 389         options_set_number(wo, "main-pane-width", 81);
 390         options_set_number(wo, "mode-attr", 0);
 391         options_set_number(wo, "mode-bg", 3);
 392         options_set_number(wo, "mode-fg", 0);
 393         options_set_number(wo, "mode-keys", MODEKEY_EMACS);
 394         options_set_number(wo, "mode-mouse", 0);
 395         options_set_number(wo, "monitor-activity", 0);
 396         options_set_string(wo, "monitor-content", "%s", "");
 397         options_set_number(wo, "window-status-attr", 0);
 398         options_set_number(wo, "window-status-bg", 8);
 399         options_set_number(wo, "window-status-current-attr", 0);
 400         options_set_number(wo, "window-status-current-bg", 8);
 401         options_set_number(wo, "window-status-current-fg", 8);
 402         options_set_number(wo, "window-status-fg", 8);
 403         options_set_string(wo, "window-status-format", "#I:#W#F");
 404         options_set_string(wo, "window-status-current-format", "#I:#W#F");
 405         options_set_number(wo, "xterm-keys", 0);
 406         options_set_number(wo, "remain-on-exit", 0);
 407         options_set_number(wo, "synchronize-panes", 0);
 408
 409         if (flags & IDENTIFY_UTF8) {
 410                 options_set_number(so, "status-utf8", 1);
 411                 options_set_number(wo, "utf8", 1);
 412         } else {
 413                 options_set_number(so, "status-utf8", 0);
 414                 options_set_number(wo, "utf8", 0);
 415         }
 416
 417         if (getcwd(cwd, sizeof cwd) == NULL) {
 418                 pw = getpwuid(getuid());
 419                 if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
 420                         strlcpy(cwd, pw->pw_dir, sizeof cwd);
 421                 else
 422                         strlcpy(cwd, "/", sizeof cwd);
 423         }
 424         options_set_string(so, "default-path", "%s", cwd);
 425
 426         if (cfg_file == NULL) {
 427                 home = getenv("HOME");
 428                 if (home == NULL || *home == '\0') {
 429                         pw = getpwuid(getuid());
 430                         if (pw != NULL)
 431                                 home = pw->pw_dir;
 432                 }
 433                 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
 434                 if (access(cfg_file, R_OK) != 0) {
 435                         xfree(cfg_file);
 436                         cfg_file = NULL;
 437                 }
 438         } else {
 439                 if (access(cfg_file, R_OK) != 0) {
 440                         log_warn("%s", cfg_file);
 441                         exit(1);
 442                 }
 443         }
 444
 445         if (label == NULL)
 446                 label = xstrdup("default");
 447         if (path == NULL && (path = makesockpath(label)) == NULL) {
 448                 log_warn("can't create socket");
 449                 exit(1);
 450         }
 451         xfree(label);
 452
 453         if (shellcmd != NULL) {
 454                 msg = MSG_SHELL;
 455                 buf = NULL;
 456                 len = 0;
 457         } else {
 458                 fill_session(&cmddata);
 459
 460                 cmddata.argc = argc;
 461                 if (cmd_pack_argv(
 462                     argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) {
 463                         log_warnx("command too long");
 464                         exit(1);
 465                 }
 466
 467                 msg = MSG_COMMAND;
 468                 buf = &cmddata;
 469                 len = sizeof cmddata;
 470         }
 471
 472         if (shellcmd != NULL)
 473                 cmdflags |= CMD_STARTSERVER;
 474         else if (argc == 0)     /* new-session is the default */
 475                 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON;
 476         else {
 477                 /*
 478                  * It sucks parsing the command string twice (in client and
 479                  * later in server) but it is necessary to get the start server
 480                  * flag.
 481                  */
 482                 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
 483                         log_warnx("%s", cause);
 484                         exit(1);
 485                 }
 486                 cmdflags &= ~CMD_STARTSERVER;
 487                 TAILQ_FOREACH(cmd, cmdlist, qentry) {
 488                         if (cmd->entry->flags & CMD_STARTSERVER)
 489                                 cmdflags |= CMD_STARTSERVER;
 490                         if (cmd->entry->flags & CMD_SENDENVIRON)
 491                                 cmdflags |= CMD_SENDENVIRON;
 492                 }
 493                 cmd_list_free(cmdlist);
 494         }
 495
 496         if ((main_ibuf = client_init(path, cmdflags, flags)) == NULL)
 497                 exit(1);
 498         xfree(path);
 499
 500         event_init();
 501
 502         imsg_compose(main_ibuf, msg, PROTOCOL_VERSION, -1, -1, buf, len);
 503
 504         main_set_signals();
 505
 506         events = EV_READ;
 507         if (main_ibuf->w.queued > 0)
 508                 events |= EV_WRITE;
 509         event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL);
 510
 511         main_exitval = 0;
 512         event_dispatch();
 513
 514         main_clear_signals();
 515
 516         client_main();  /* doesn't return */
 517 }
 518
 519 void
 520 main_set_signals(void)
 521 {
 522         struct sigaction        sigact;
 523
 524         memset(&sigact, 0, sizeof sigact);
 525         sigemptyset(&sigact.sa_mask);
 526         sigact.sa_flags = SA_RESTART;
 527         sigact.sa_handler = SIG_IGN;
 528         if (sigaction(SIGINT, &sigact, NULL) != 0)
 529                 fatal("sigaction failed");
 530         if (sigaction(SIGPIPE, &sigact, NULL) != 0)
 531                 fatal("sigaction failed");
 532         if (sigaction(SIGUSR1, &sigact, NULL) != 0)
 533                 fatal("sigaction failed");
 534         if (sigaction(SIGUSR2, &sigact, NULL) != 0)
 535                 fatal("sigaction failed");
 536         if (sigaction(SIGTSTP, &sigact, NULL) != 0)
 537                 fatal("sigaction failed");
 538
 539         signal_set(&main_ev_sigterm, SIGTERM, main_signal, NULL);
 540         signal_add(&main_ev_sigterm, NULL);
 541 }
 542
 543 void
 544 main_clear_signals(void)
 545 {
 546         struct sigaction        sigact;
 547
 548         memset(&sigact, 0, sizeof sigact);
 549         sigemptyset(&sigact.sa_mask);
 550         sigact.sa_flags = SA_RESTART;
 551         sigact.sa_handler = SIG_DFL;
 552         if (sigaction(SIGINT, &sigact, NULL) != 0)
 553                 fatal("sigaction failed");
 554         if (sigaction(SIGPIPE, &sigact, NULL) != 0)
 555                 fatal("sigaction failed");
 556         if (sigaction(SIGUSR1, &sigact, NULL) != 0)
 557                 fatal("sigaction failed");
 558         if (sigaction(SIGUSR2, &sigact, NULL) != 0)
 559                 fatal("sigaction failed");
 560         if (sigaction(SIGTSTP, &sigact, NULL) != 0)
 561                 fatal("sigaction failed");
 562
 563         event_del(&main_ev_sigterm);
 564 }
 565
 566 /* ARGSUSED */
 567 void
 568 main_signal(int sig, unused short events, unused void *data)
 569 {
 570         switch (sig) {
 571         case SIGTERM:
 572                 exit(1);
 573         }
 574 }
 575
 576 /* ARGSUSED */
 577 void
 578 main_callback(unused int fd, short events, void *data)
 579 {
 580         char    *shellcmd = data;
 581
 582         if (events & EV_READ)
 583                 main_dispatch(shellcmd);
 584
 585         if (events & EV_WRITE) {
 586                 if (msgbuf_write(&main_ibuf->w) < 0)
 587                         fatalx("msgbuf_write failed");
 588         }
 589
 590         events = EV_READ;
 591         if (main_ibuf->w.queued > 0)
 592                 events |= EV_WRITE;
 593         event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL);
 594 }
 595
 596 void
 597 main_dispatch(const char *shellcmd)
 598 {
 599         struct imsg             imsg;
 600         ssize_t                 n, datalen;
 601         struct msg_print_data   printdata;
 602         struct msg_shell_data   shelldata;
 603
 604         if ((n = imsg_read(main_ibuf)) == -1 || n == 0)
 605                 fatalx("imsg_read failed");
 606
 607         for (;;) {
 608                 if ((n = imsg_get(main_ibuf, &imsg)) == -1)
 609                         fatalx("imsg_get failed");
 610                 if (n == 0)
 611                         return;
 612                 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
 613
 614                 switch (imsg.hdr.type) {
 615                 case MSG_EXIT:
 616                 case MSG_SHUTDOWN:
 617                         if (datalen != 0)
 618                                 fatalx("bad MSG_EXIT size");
 619
 620                         exit(main_exitval);
 621                 case MSG_ERROR:
 622                 case MSG_PRINT:
 623                         if (datalen != sizeof printdata)
 624                                 fatalx("bad MSG_PRINT size");
 625                         memcpy(&printdata, imsg.data, sizeof printdata);
 626                         printdata.msg[(sizeof printdata.msg) - 1] = '\0';
 627
 628                         log_info("%s", printdata.msg);
 629                         if (imsg.hdr.type == MSG_ERROR)
 630                                 main_exitval = 1;
 631                         break;
 632                 case MSG_READY:
 633                         if (datalen != 0)
 634                                 fatalx("bad MSG_READY size");
 635
 636                         event_loopexit(NULL);   /* move to client_main() */
 637                         break;
 638                 case MSG_VERSION:
 639                         if (datalen != 0)
 640                                 fatalx("bad MSG_VERSION size");
 641
 642                         log_warnx("protocol version mismatch (client %u, "
 643                             "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid);
 644                         exit(1);
 645                 case MSG_SHELL:
 646                         if (datalen != sizeof shelldata)
 647                                 fatalx("bad MSG_SHELL size");
 648                         memcpy(&shelldata, imsg.data, sizeof shelldata);
 649                         shelldata.shell[(sizeof shelldata.shell) - 1] = '\0';
 650
 651                         main_clear_signals();
 652
 653                         shell_exec(shelldata.shell, shellcmd);
 654                 default:
 655                         fatalx("unexpected message");
 656                 }
 657
 658                 imsg_free(&imsg);
 659         }
 660 }