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 #include <sys/wait.h>
  22
  23 #include <errno.h>
  24 #include <event.h>
  25 #include <paths.h>
  26 #include <pwd.h>
  27 #include <signal.h>
  28 #include <stdlib.h>
  29 #include <string.h>
  30 #include <syslog.h>
  31 #include <unistd.h>
  32
  33 #include "tmux.h"
  34
  35 #ifdef DEBUG
  36 extern char     *malloc_options;
  37 #endif
  38
  39 char            *cfg_file;
  40 struct options   global_options;        /* server options */
  41 struct options   global_s_options;      /* session options */
  42 struct options   global_w_options;      /* window options */
  43 struct environ   global_environ;
  44
  45 struct event_base *ev_base;
  46
  47 int              debug_level;
  48 time_t           start_time;
  49 char            *socket_path;
  50 int              login_shell;
  51
  52 struct env_data {
  53         char    *path;
  54         pid_t    pid;
  55         u_int    idx;
  56 };
  57
  58 __dead void      usage(void);
  59 void             parse_env(struct env_data *);
  60 char            *makesockpath(const char *);
  61 __dead void      shell_exec(const char *, const char *);
  62
  63 struct imsgbuf  *main_ibuf;
  64 int              main_exitval;
  65
  66 void             main_signal(int, short, unused void *);
  67 void             main_callback(int, short, void *);
  68 void             main_dispatch(const char *);
  69
  70 __dead void
  71 usage(void)
  72 {
  73         fprintf(stderr,
  74             "usage: %s [-28lquv] [-c shell-command] [-f file] [-L socket-name]\n"
  75             "            [-S socket-path] [command [flags]]\n",
  76             __progname);
  77         exit(1);
  78 }
  79
  80 void
  81 logfile(const char *name)
  82 {
  83         char    *path;
  84
  85         log_close();
  86         if (debug_level > 0) {
  87                 xasprintf(&path, "tmux-%s-%ld.log", name, (long) getpid());
  88                 log_open_file(debug_level, path);
  89                 xfree(path);
  90         }
  91 }
  92
  93 const char *
  94 getshell(void)
  95 {
  96         struct passwd   *pw;
  97         const char      *shell;
  98
  99         shell = getenv("SHELL");
 100         if (checkshell(shell))
 101                 return (shell);
 102
 103         pw = getpwuid(getuid());
 104         if (pw != NULL && checkshell(pw->pw_shell))
 105                 return (pw->pw_shell);
 106
 107         return (_PATH_BSHELL);
 108 }
 109
 110 int
 111 checkshell(const char *shell)
 112 {
 113         if (shell == NULL || *shell == '\0' || areshell(shell))
 114                 return (0);
 115         if (access(shell, X_OK) != 0)
 116                 return (0);
 117         return (1);
 118 }
 119
 120 int
 121 areshell(const char *shell)
 122 {
 123         const char      *progname, *ptr;
 124
 125         if ((ptr = strrchr(shell, '/')) != NULL)
 126                 ptr++;
 127         else
 128                 ptr = shell;
 129         progname = __progname;
 130         if (*progname == '-')
 131                 progname++;
 132         if (strcmp(ptr, progname) == 0)
 133                 return (1);
 134         return (0);
 135 }
 136
 137 void
 138 parse_env(struct env_data *data)
 139 {
 140         char            *env, *path_pid, *pid_idx, buf[256];
 141         size_t           len;
 142         const char      *errstr;
 143         long long        ll;
 144
 145         data->pid = -1;
 146         if ((env = getenv("TMUX")) == NULL)
 147                 return;
 148
 149         if ((path_pid = strchr(env, ',')) == NULL || path_pid == env)
 150                 return;
 151         if ((pid_idx = strchr(path_pid + 1, ',')) == NULL)
 152                 return;
 153         if ((pid_idx == path_pid + 1 || pid_idx[1] == '\0'))
 154                 return;
 155
 156         /* path */
 157         len = path_pid - env;
 158         data->path = xmalloc (len + 1);
 159         memcpy(data->path, env, len);
 160         data->path[len] = '\0';
 161
 162         /* pid */
 163         len = pid_idx - path_pid - 1;
 164         if (len > (sizeof buf) - 1)
 165                 return;
 166         memcpy(buf, path_pid + 1, len);
 167         buf[len] = '\0';
 168
 169         ll = strtonum(buf, 0, LONG_MAX, &errstr);
 170         if (errstr != NULL)
 171                 return;
 172         data->pid = ll;
 173
 174         /* idx */
 175         ll = strtonum(pid_idx+1, 0, UINT_MAX, &errstr);
 176         if (errstr != NULL)
 177                 return;
 178         data->idx = ll;
 179 }
 180
 181 char *
 182 makesockpath(const char *label)
 183 {
 184         char            base[MAXPATHLEN], *path;
 185         struct stat     sb;
 186         u_int           uid;
 187
 188         uid = getuid();
 189         xsnprintf(base, MAXPATHLEN, "%s/tmux-%d", _PATH_TMP, uid);
 190
 191         if (mkdir(base, S_IRWXU) != 0 && errno != EEXIST)
 192                 return (NULL);
 193
 194         if (lstat(base, &sb) != 0)
 195                 return (NULL);
 196         if (!S_ISDIR(sb.st_mode)) {
 197                 errno = ENOTDIR;
 198                 return (NULL);
 199         }
 200         if (sb.st_uid != uid || (sb.st_mode & (S_IRWXG|S_IRWXO)) != 0) {
 201                 errno = EACCES;
 202                 return (NULL);
 203         }
 204
 205         xasprintf(&path, "%s/%s", base, label);
 206         return (path);
 207 }
 208
 209 __dead void
 210 shell_exec(const char *shell, const char *shellcmd)
 211 {
 212         const char      *shellname, *ptr;
 213         char            *argv0;
 214
 215         ptr = strrchr(shell, '/');
 216         if (ptr != NULL && *(ptr + 1) != '\0')
 217                 shellname = ptr + 1;
 218         else
 219                 shellname = shell;
 220         if (login_shell)
 221                 xasprintf(&argv0, "-%s", shellname);
 222         else
 223                 xasprintf(&argv0, "%s", shellname);
 224         setenv("SHELL", shell, 1);
 225
 226         execl(shell, argv0, "-c", shellcmd, (char *) NULL);
 227         fatal("execl failed");
 228 }
 229
 230 int
 231 main(int argc, char **argv)
 232 {
 233         struct cmd_list         *cmdlist;
 234         struct cmd              *cmd;
 235         enum msgtype             msg;
 236         struct passwd           *pw;
 237         struct options          *oo, *so, *wo;
 238         struct keylist          *keylist;
 239         struct env_data          envdata;
 240         struct msg_command_data  cmddata;
 241         char                    *s, *shellcmd, *path, *label, *home, *cause;
 242         char                     cwd[MAXPATHLEN], **var;
 243         void                    *buf;
 244         size_t                   len;
 245         int                      opt, flags, quiet = 0, cmdflags = 0;
 246         short                    events;
 247
 248 #ifdef DEBUG
 249         malloc_options = (char *) "AFGJPX";
 250 #endif
 251
 252         flags = 0;
 253         shellcmd = label = path = NULL;
 254         envdata.path = NULL;
 255         login_shell = (**argv == '-');
 256         while ((opt = getopt(argc, argv, "28c:df:lL:qS:uUv")) != -1) {
 257                 switch (opt) {
 258                 case '2':
 259                         flags |= IDENTIFY_256COLOURS;
 260                         flags &= ~IDENTIFY_88COLOURS;
 261                         break;
 262                 case '8':
 263                         flags |= IDENTIFY_88COLOURS;
 264                         flags &= ~IDENTIFY_256COLOURS;
 265                         break;
 266                 case 'c':
 267                         if (shellcmd != NULL)
 268                                 xfree(shellcmd);
 269                         shellcmd = xstrdup(optarg);
 270                         break;
 271                 case 'f':
 272                         if (cfg_file != NULL)
 273                                 xfree(cfg_file);
 274                         cfg_file = xstrdup(optarg);
 275                         break;
 276                 case 'l':
 277                         login_shell = 1;
 278                         break;
 279                 case 'L':
 280                         if (label != NULL)
 281                                 xfree(label);
 282                         label = xstrdup(optarg);
 283                         break;
 284                 case 'q':
 285                         quiet = 1;
 286                         break;
 287                 case 'S':
 288                         if (path != NULL)
 289                                 xfree(path);
 290                         path = xstrdup(optarg);
 291                         break;
 292                 case 'u':
 293                         flags |= IDENTIFY_UTF8;
 294                         break;
 295                 case 'v':
 296                         debug_level++;
 297                         break;
 298                 default:
 299                         usage();
 300                 }
 301         }
 302         argc -= optind;
 303         argv += optind;
 304
 305         if (shellcmd != NULL && argc != 0)
 306                 usage();
 307
 308         log_open_tty(debug_level);
 309
 310         if (!(flags & IDENTIFY_UTF8)) {
 311                 /*
 312                  * If the user has set whichever of LC_ALL, LC_CTYPE or LANG
 313                  * exist (in that order) to contain UTF-8, it is a safe
 314                  * assumption that either they are using a UTF-8 terminal, or
 315                  * if not they know that output from UTF-8-capable programs may
 316                  * be wrong.
 317                  */
 318                 if ((s = getenv("LC_ALL")) == NULL) {
 319                         if ((s = getenv("LC_CTYPE")) == NULL)
 320                                 s = getenv("LANG");
 321                 }
 322                 if (s != NULL && (strcasestr(s, "UTF-8") != NULL ||
 323                     strcasestr(s, "UTF8") != NULL))
 324                         flags |= IDENTIFY_UTF8;
 325         }
 326
 327         environ_init(&global_environ);
 328         for (var = environ; *var != NULL; var++)
 329                 environ_put(&global_environ, *var);
 330
 331         options_init(&global_options, NULL);
 332         oo = &global_options;
 333         options_set_number(oo, "quiet", quiet);
 334         options_set_number(oo, "escape-time", 500);
 335
 336         options_init(&global_s_options, NULL);
 337         so = &global_s_options;
 338         options_set_number(so, "base-index", 0);
 339         options_set_number(so, "bell-action", BELL_ANY);
 340         options_set_number(so, "buffer-limit", 9);
 341         options_set_string(so, "default-command", "%s", "");
 342         options_set_string(so, "default-shell", "%s", getshell());
 343         options_set_string(so, "default-terminal", "screen");
 344         options_set_number(so, "display-panes-colour", 4);
 345         options_set_number(so, "display-panes-active-colour", 1);
 346         options_set_number(so, "display-panes-time", 1000);
 347         options_set_number(so, "display-time", 750);
 348         options_set_number(so, "history-limit", 2000);
 349         options_set_number(so, "lock-after-time", 0);
 350         options_set_string(so, "lock-command", "lock -np");
 351         options_set_number(so, "lock-server", 1);
 352         options_set_number(so, "message-attr", 0);
 353         options_set_number(so, "message-bg", 3);
 354         options_set_number(so, "message-fg", 0);
 355         options_set_number(so, "message-limit", 20);
 356         options_set_number(so, "mouse-select-pane", 0);
 357         options_set_number(so, "pane-active-border-bg", 8);
 358         options_set_number(so, "pane-active-border-fg", 2);
 359         options_set_number(so, "pane-border-bg", 8);
 360         options_set_number(so, "pane-border-fg", 8);
 361         options_set_number(so, "repeat-time", 500);
 362         options_set_number(so, "set-remain-on-exit", 0);
 363         options_set_number(so, "set-titles", 0);
 364         options_set_string(so, "set-titles-string", "#S:#I:#W - \"#T\"");
 365         options_set_number(so, "status", 1);
 366         options_set_number(so, "status-attr", 0);
 367         options_set_number(so, "status-bg", 2);
 368         options_set_number(so, "status-fg", 0);
 369         options_set_number(so, "status-interval", 15);
 370         options_set_number(so, "status-justify", 0);
 371         options_set_number(so, "status-keys", MODEKEY_EMACS);
 372         options_set_string(so, "status-left", "[#S]");
 373         options_set_number(so, "status-left-attr", 0);
 374         options_set_number(so, "status-left-bg", 8);
 375         options_set_number(so, "status-left-fg", 8);
 376         options_set_number(so, "status-left-length", 10);
 377         options_set_string(so, "status-right", "\"#22T\" %%H:%%M %%d-%%b-%%y");
 378         options_set_number(so, "status-right-attr", 0);
 379         options_set_number(so, "status-right-bg", 8);
 380         options_set_number(so, "status-right-fg", 8);
 381         options_set_number(so, "status-right-length", 40);
 382         options_set_string(so, "terminal-overrides",
 383             "*88col*:colors=88,*256col*:colors=256");
 384         options_set_string(so, "update-environment", "DISPLAY "
 385             "WINDOWID SSH_ASKPASS SSH_AUTH_SOCK SSH_AGENT_PID SSH_CONNECTION");
 386         options_set_number(so, "visual-activity", 0);
 387         options_set_number(so, "visual-bell", 0);
 388         options_set_number(so, "visual-content", 0);
 389
 390         keylist = xmalloc(sizeof *keylist);
 391         ARRAY_INIT(keylist);
 392         ARRAY_ADD(keylist, '\002');
 393         options_set_data(so, "prefix", keylist, xfree);
 394
 395         options_init(&global_w_options, NULL);
 396         wo = &global_w_options;
 397         options_set_number(wo, "aggressive-resize", 0);
 398         options_set_number(wo, "alternate-screen", 1);
 399         options_set_number(wo, "automatic-rename", 1);
 400         options_set_number(wo, "clock-mode-colour", 4);
 401         options_set_number(wo, "clock-mode-style", 1);
 402         options_set_number(wo, "force-height", 0);
 403         options_set_number(wo, "force-width", 0);
 404         options_set_number(wo, "main-pane-height", 24);
 405         options_set_number(wo, "main-pane-width", 81);
 406         options_set_number(wo, "mode-attr", 0);
 407         options_set_number(wo, "mode-bg", 3);
 408         options_set_number(wo, "mode-fg", 0);
 409         options_set_number(wo, "mode-keys", MODEKEY_EMACS);
 410         options_set_number(wo, "mode-mouse", 0);
 411         options_set_number(wo, "monitor-activity", 0);
 412         options_set_string(wo, "monitor-content", "%s", "");
 413         options_set_number(wo, "window-status-attr", 0);
 414         options_set_number(wo, "window-status-bg", 8);
 415         options_set_number(wo, "window-status-current-attr", 0);
 416         options_set_number(wo, "window-status-current-bg", 8);
 417         options_set_number(wo, "window-status-current-fg", 8);
 418         options_set_number(wo, "window-status-fg", 8);
 419         options_set_number(wo, "window-status-alert-attr", GRID_ATTR_REVERSE);
 420         options_set_number(wo, "window-status-alert-bg", 8);
 421         options_set_number(wo, "window-status-alert-fg", 8);
 422         options_set_string(wo, "window-status-format", "#I:#W#F");
 423         options_set_string(wo, "window-status-current-format", "#I:#W#F");
 424         options_set_string(wo, "word-separators", " -_@");
 425         options_set_number(wo, "xterm-keys", 0);
 426         options_set_number(wo, "remain-on-exit", 0);
 427         options_set_number(wo, "synchronize-panes", 0);
 428
 429         if (flags & IDENTIFY_UTF8) {
 430                 options_set_number(so, "status-utf8", 1);
 431                 options_set_number(wo, "utf8", 1);
 432         } else {
 433                 options_set_number(so, "status-utf8", 0);
 434                 options_set_number(wo, "utf8", 0);
 435         }
 436
 437         if (getcwd(cwd, sizeof cwd) == NULL) {
 438                 pw = getpwuid(getuid());
 439                 if (pw->pw_dir != NULL && *pw->pw_dir != '\0')
 440                         strlcpy(cwd, pw->pw_dir, sizeof cwd);
 441                 else
 442                         strlcpy(cwd, "/", sizeof cwd);
 443         }
 444         options_set_string(so, "default-path", "%s", cwd);
 445
 446         if (cfg_file == NULL) {
 447                 home = getenv("HOME");
 448                 if (home == NULL || *home == '\0') {
 449                         pw = getpwuid(getuid());
 450                         if (pw != NULL)
 451                                 home = pw->pw_dir;
 452                 }
 453                 xasprintf(&cfg_file, "%s/%s", home, DEFAULT_CFG);
 454                 if (access(cfg_file, R_OK) != 0 && errno == ENOENT) {
 455                         xfree(cfg_file);
 456                         cfg_file = NULL;
 457                 }
 458         }
 459
 460         /*
 461          * Figure out the socket path. If specified on the command-line with
 462          * -S or -L, use it, otherwise try $TMUX or assume -L default.
 463          */
 464         parse_env(&envdata);
 465         if (path == NULL) {
 466                 /* No -L. Try $TMUX, or default. */
 467                 if (label == NULL) {
 468                         path = envdata.path;
 469                         if (path == NULL)
 470                                 label = xstrdup("default");
 471                 }
 472
 473                 /* -L or default set. */
 474                 if (label != NULL) {
 475                         if ((path = makesockpath(label)) == NULL) {
 476                                 log_warn("can't create socket");
 477                                 exit(1);
 478                         }
 479                 }
 480         }
 481         if (label != NULL)
 482                 xfree(label);
 483
 484         if (shellcmd != NULL) {
 485                 msg = MSG_SHELL;
 486                 buf = NULL;
 487                 len = 0;
 488         } else {
 489                 cmddata.pid = envdata.pid;
 490                 cmddata.idx = envdata.idx;
 491
 492                 /* Prepare command for server. */
 493                 cmddata.argc = argc;
 494                 if (cmd_pack_argv(
 495                     argc, argv, cmddata.argv, sizeof cmddata.argv) != 0) {
 496                         log_warnx("command too long");
 497                         exit(1);
 498                 }
 499
 500                 msg = MSG_COMMAND;
 501                 buf = &cmddata;
 502                 len = sizeof cmddata;
 503         }
 504
 505         if (shellcmd != NULL)
 506                 cmdflags |= CMD_STARTSERVER;
 507         else if (argc == 0)     /* new-session is the default */
 508                 cmdflags |= CMD_STARTSERVER|CMD_SENDENVIRON|CMD_CANTNEST;
 509         else {
 510                 /*
 511                  * It sucks parsing the command string twice (in client and
 512                  * later in server) but it is necessary to get the start server
 513                  * flag.
 514                  */
 515                 if ((cmdlist = cmd_list_parse(argc, argv, &cause)) == NULL) {
 516                         log_warnx("%s", cause);
 517                         exit(1);
 518                 }
 519                 cmdflags &= ~CMD_STARTSERVER;
 520                 TAILQ_FOREACH(cmd, cmdlist, qentry) {
 521                         if (cmd->entry->flags & CMD_STARTSERVER)
 522                                 cmdflags |= CMD_STARTSERVER;
 523                         if (cmd->entry->flags & CMD_SENDENVIRON)
 524                                 cmdflags |= CMD_SENDENVIRON;
 525                         if (cmd->entry->flags & CMD_CANTNEST)
 526                                 cmdflags |= CMD_CANTNEST;
 527                 }
 528                 cmd_list_free(cmdlist);
 529         }
 530
 531         /*
 532          * Check if this could be a nested session, if the command can't nest:
 533          * if the socket path matches $TMUX, this is probably the same server.
 534          */
 535         if (shellcmd == NULL && envdata.path != NULL &&
 536             cmdflags & CMD_CANTNEST &&
 537             (path == envdata.path || strcmp(path, envdata.path) == 0)) {
 538                 log_warnx("sessions should be nested with care. "
 539                     "unset $TMUX to force.");
 540                 exit(1);
 541         }
 542
 543         ev_base = event_init();
 544         set_signals(main_signal);
 545
 546         /* Initialise the client socket/start the server. */
 547         if ((main_ibuf = client_init(path, cmdflags, flags)) == NULL)
 548                 exit(1);
 549         xfree(path);
 550
 551         imsg_compose(main_ibuf, msg, PROTOCOL_VERSION, -1, -1, buf, len);
 552
 553         events = EV_READ;
 554         if (main_ibuf->w.queued > 0)
 555                 events |= EV_WRITE;
 556         event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL);
 557
 558         main_exitval = 0;
 559         event_dispatch();
 560
 561         clear_signals();
 562
 563         client_main();  /* doesn't return */
 564 }
 565
 566 /* ARGSUSED */
 567 void
 568 main_signal(int sig, unused short events, unused void *data)
 569 {
 570         int     status;
 571
 572         switch (sig) {
 573         case SIGTERM:
 574                 exit(1);
 575         case SIGCHLD:
 576                 waitpid(WAIT_ANY, &status, WNOHANG);
 577                 break;
 578         }
 579 }
 580
 581 /* ARGSUSED */
 582 void
 583 main_callback(unused int fd, short events, void *data)
 584 {
 585         char    *shellcmd = data;
 586
 587         if (events & EV_READ)
 588                 main_dispatch(shellcmd);
 589
 590         if (events & EV_WRITE) {
 591                 if (msgbuf_write(&main_ibuf->w) < 0)
 592                         fatalx("msgbuf_write failed");
 593         }
 594
 595         events = EV_READ;
 596         if (main_ibuf->w.queued > 0)
 597                 events |= EV_WRITE;
 598         event_once(main_ibuf->fd, events, main_callback, shellcmd, NULL);
 599 }
 600
 601 void
 602 main_dispatch(const char *shellcmd)
 603 {
 604         struct imsg             imsg;
 605         ssize_t                 n, datalen;
 606         struct msg_print_data   printdata;
 607         struct msg_shell_data   shelldata;
 608
 609         if ((n = imsg_read(main_ibuf)) == -1 || n == 0)
 610                 fatalx("imsg_read failed");
 611
 612         for (;;) {
 613                 if ((n = imsg_get(main_ibuf, &imsg)) == -1)
 614                         fatalx("imsg_get failed");
 615                 if (n == 0)
 616                         return;
 617                 datalen = imsg.hdr.len - IMSG_HEADER_SIZE;
 618
 619                 switch (imsg.hdr.type) {
 620                 case MSG_EXIT:
 621                 case MSG_SHUTDOWN:
 622                         if (datalen != 0)
 623                                 fatalx("bad MSG_EXIT size");
 624
 625                         exit(main_exitval);
 626                 case MSG_ERROR:
 627                 case MSG_PRINT:
 628                         if (datalen != sizeof printdata)
 629                                 fatalx("bad MSG_PRINT size");
 630                         memcpy(&printdata, imsg.data, sizeof printdata);
 631                         printdata.msg[(sizeof printdata.msg) - 1] = '\0';
 632
 633                         log_info("%s", printdata.msg);
 634                         if (imsg.hdr.type == MSG_ERROR)
 635                                 main_exitval = 1;
 636                         break;
 637                 case MSG_READY:
 638                         if (datalen != 0)
 639                                 fatalx("bad MSG_READY size");
 640
 641                         event_loopexit(NULL);   /* move to client_main() */
 642                         break;
 643                 case MSG_VERSION:
 644                         if (datalen != 0)
 645                                 fatalx("bad MSG_VERSION size");
 646
 647                         log_warnx("protocol version mismatch (client %u, "
 648                             "server %u)", PROTOCOL_VERSION, imsg.hdr.peerid);
 649                         exit(1);
 650                 case MSG_SHELL:
 651                         if (datalen != sizeof shelldata)
 652                                 fatalx("bad MSG_SHELL size");
 653                         memcpy(&shelldata, imsg.data, sizeof shelldata);
 654                         shelldata.shell[(sizeof shelldata.shell) - 1] = '\0';
 655
 656                         clear_signals();
 657
 658                         shell_exec(shelldata.shell, shellcmd);
 659                 default:
 660                         fatalx("unexpected message");
 661                 }
 662
 663                 imsg_free(&imsg);
 664         }
 665 }