src/screen.c

   1 /* Copyright (c) 1993-2002
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  * Copyright (c) 1987 Oliver Laumann
   5 #ifdef HAVE_BRAILLE
   6  * Modified by:
   7  *      Authors:  Hadi Bargi Rangin  bargi@dots.physics.orst.edu
   8  *                Bill Barry         barryb@dots.physics.orst.edu
   9  *                Randy Lundquist    randyl@dots.physics.orst.edu
  10  *
  11  * Modifications Copyright (c) 1995 by
  12  * Science Access Project, Oregon State University.
  13 #endif
  14  *
  15  * This program is free software; you can redistribute it and/or modify
  16  * it under the terms of the GNU General Public License as published by
  17  * the Free Software Foundation; either version 2, or (at your option)
  18  * any later version.
  19  *
  20  * This program is distributed in the hope that it will be useful,
  21  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  22  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  23  * GNU General Public License for more details.
  24  *
  25  * You should have received a copy of the GNU General Public License
  26  * along with this program (see the file COPYING); if not, write to the
  27  * Free Software Foundation, Inc.,
  28  * 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA
  29  *
  30  ****************************************************************
  31  */
  32
  33 #include <sys/types.h>
  34 #include <ctype.h>
  35
  36 #include <fcntl.h>
  37
  38 #ifdef sgi
  39 # include <sys/sysmacros.h>
  40 #endif
  41
  42 #include <sys/stat.h>
  43 #ifndef sun
  44 # include <sys/ioctl.h>
  45 #endif
  46
  47 #ifndef SIGINT
  48 # include <signal.h>
  49 #endif
  50
  51 #include "config.h"
  52
  53 #ifdef SVR4
  54 # include <sys/stropts.h>
  55 #endif
  56
  57 #if defined(SYSV) && !defined(ISC)
  58 # include <sys/utsname.h>
  59 #endif
  60
  61 #if defined(sequent) || defined(SVR4)
  62 # include <sys/resource.h>
  63 #endif /* sequent || SVR4 */
  64
  65 #ifdef ISC
  66 # include <sys/tty.h>
  67 # include <sys/sioctl.h>
  68 # include <sys/pty.h>
  69 #endif /* ISC */
  70
  71 #if (defined(AUX) || defined(_AUX_SOURCE)) && defined(POSIX)
  72 # include <compat.h>
  73 #endif
  74 #if defined(USE_LOCALE) || defined(ENCODINGS)
  75 # include <locale.h>
  76 #endif
  77 #if defined(HAVE_NL_LANGINFO) && defined(ENCODINGS)
  78 # include <langinfo.h>
  79 #endif
  80
  81 #include "screen.h"
  82 #ifdef HAVE_BRAILLE
  83 # include "braille.h"
  84 #endif
  85
  86 #include "patchlevel.h"
  87
  88 /*
  89  *  At the moment we only need the real password if the
  90  *  builtin lock is used. Therefore disable SHADOWPW if
  91  *  we do not really need it (kind of security thing).
  92  */
  93 #ifndef LOCK
  94 # undef SHADOWPW
  95 #endif
  96
  97 #include <pwd.h>
  98 #ifdef SHADOWPW
  99 # include <shadow.h>
 100 #endif /* SHADOWPW */
 101
 102 #include "logfile.h"    /* islogfile, logfflush */
 103
 104 #ifdef DEBUG
 105 FILE *dfp;
 106 #endif
 107
 108
 109 extern char Term[], screenterm[], **environ, Termcap[];
 110 int force_vt = 1;
 111 int VBellWait, MsgWait, MsgMinWait, SilenceWait;
 112
 113 extern struct acluser *users;
 114 extern struct display *displays, *display;
 115
 116
 117 extern int visual_bell;
 118 #ifdef COPY_PASTE
 119 extern unsigned char mark_key_tab[];
 120 #endif
 121 extern char version[];
 122 extern char DefaultShell[];
 123 #ifdef ZMODEM
 124 extern char *zmodem_sendcmd;
 125 extern char *zmodem_recvcmd;
 126 #endif
 127 extern struct layout *layout_last;
 128
 129
 130 char *ShellProg;
 131 char *ShellArgs[2];
 132
 133 extern struct NewWindow nwin_undef, nwin_default, nwin_options;
 134 struct backtick;
 135
 136 static struct passwd *getpwbyname __P((char *, struct passwd *));
 137 static void  SigChldHandler __P((void));
 138 static sigret_t SigChld __P(SIGPROTOARG);
 139 static sigret_t SigInt __P(SIGPROTOARG);
 140 static sigret_t CoreDump __P(SIGPROTOARG);
 141 static sigret_t FinitHandler __P(SIGPROTOARG);
 142 static void  DoWait __P((void));
 143 static void  serv_read_fn __P((struct event *, char *));
 144 static void  serv_select_fn __P((struct event *, char *));
 145 static void  logflush_fn __P((struct event *, char *));
 146 static void  backtick_filter __P((struct backtick *));
 147 static void  backtick_fn __P((struct event *, char *));
 148 static char *runbacktick __P((struct backtick *, int *, time_t));
 149 static int   IsSymbol __P((char *, char *));
 150 static char *ParseChar __P((char *, char *));
 151 static int   ParseEscape __P((char *));
 152 static char *pad_expand __P((char *, char *, int, int));
 153 #ifdef DEBUG
 154 static void  fds __P((void));
 155 #endif
 156
 157 int nversion;   /* numerical version, used for secondary DA */
 158
 159 /* the attacher */
 160 struct passwd *ppp;
 161 char *attach_tty;
 162 int attach_fd = -1;
 163 char *attach_term;
 164 char *LoginName;
 165 struct mode attach_Mode;
 166
 167 char SockPath[MAXPATHLEN + 2 * MAXSTR];
 168 char *SockName;                 /* SockName is pointer in SockPath */
 169 char *SockMatch = NULL;         /* session id command line argument */
 170 int ServerSocket = -1;
 171 struct event serv_read;
 172 struct event serv_select;
 173 struct event logflushev;
 174
 175 char **NewEnv = NULL;
 176
 177 char *RcFileName = NULL;
 178 char *home;
 179
 180 char *screenlogfile;                    /* filename layout */
 181 int log_flush = 10;                     /* flush interval in seconds */
 182 int logtstamp_on = 0;                   /* tstamp disabled */
 183 char *logtstamp_string;                 /* stamp layout */
 184 int logtstamp_after = 120;              /* first tstamp after 120s */
 185 char *hardcopydir = NULL;
 186 char *BellString;
 187 char *VisualBellString;
 188 char *ActivityString;
 189 #ifdef COPY_PASTE
 190 char *BufferFile;
 191 #endif
 192 #ifdef POW_DETACH
 193 char *PowDetachString;
 194 #endif
 195 char *hstatusstring;
 196 char *captionstring;
 197 char *timestring;
 198 char *wliststr;
 199 char *wlisttit;
 200 int auto_detach = 1;
 201 int iflag, rflag, dflag, lsflag, quietflag, wipeflag, xflag;
 202 int cmdflag;
 203 int adaptflag;
 204
 205 #ifdef MULTIUSER
 206 char *multi;
 207 char *multi_home;
 208 int multi_uid;
 209 int own_uid;
 210 int multiattach;
 211 int tty_mode;
 212 int tty_oldmode = -1;
 213 #endif
 214
 215 char HostName[MAXSTR];
 216 int MasterPid, PanicPid;
 217 int real_uid, real_gid, eff_uid, eff_gid;
 218 int default_startup;
 219 int ZombieKey_destroy, ZombieKey_resurrect, ZombieKey_onerror;
 220 char *preselect = NULL;         /* only used in Attach() */
 221
 222 #ifdef UTF8
 223 char *screenencodings;
 224 #endif
 225
 226 #ifdef NETHACK
 227 int nethackflag = 0;
 228 #endif
 229 int maxwin = MAXWIN;
 230
 231
 232 struct layer *flayer;
 233 struct win *fore;
 234 struct win *windows;
 235 struct win *console_window;
 236
 237
 238
 239 /*
 240  * Do this last
 241  */
 242 #include "extern.h"
 243
 244 char strnomem[] = "Out of memory.";
 245
 246
 247 static int InterruptPlease;
 248 static int GotSigChld;
 249
 250 static int
 251 lf_secreopen(name, wantfd, l)
 252 char *name;
 253 int wantfd;
 254 struct logfile *l;
 255 {
 256   int got_fd;
 257
 258   close(wantfd);
 259   if (((got_fd = secopen(name, O_WRONLY | O_CREAT | O_APPEND, 0666)) < 0) ||
 260       lf_move_fd(got_fd, wantfd) < 0)
 261     {
 262       logfclose(l);
 263       debug1("lf_secreopen: failed for %s\n", name);
 264       return -1;
 265     }
 266   l->st->st_ino = l->st->st_dev = 0;
 267   debug2("lf_secreopen: %d = %s\n", wantfd, name);
 268   return 0;
 269 }
 270
 271 /********************************************************************/
 272 /********************************************************************/
 273 /********************************************************************/
 274
 275
 276 static struct passwd *
 277 getpwbyname(name, ppp)
 278 char *name;
 279 struct passwd *ppp;
 280 {
 281   int n;
 282 #ifdef SHADOWPW
 283   struct spwd *sss = NULL;
 284   static char *spw = NULL;
 285 #endif
 286
 287   if (!ppp && !(ppp = getpwnam(name)))
 288     return NULL;
 289
 290   /* Do password sanity check..., allow ##user for SUN_C2 security */
 291 #ifdef SHADOWPW
 292 pw_try_again:
 293 #endif
 294   n = 0;
 295   if (ppp->pw_passwd[0] == '#' && ppp->pw_passwd[1] == '#' &&
 296       strcmp(ppp->pw_passwd + 2, ppp->pw_name) == 0)
 297     n = 13;
 298   for (; n < 13; n++)
 299     {
 300       char c = ppp->pw_passwd[n];
 301       if (!(c == '.' || c == '/' || c == '$' ||
 302             (c >= '0' && c <= '9') ||
 303             (c >= 'a' && c <= 'z') ||
 304             (c >= 'A' && c <= 'Z')))
 305         break;
 306     }
 307
 308 #ifdef SHADOWPW
 309   /* try to determine real password */
 310   if (n < 13 && sss == 0)
 311     {
 312       sss = getspnam(ppp->pw_name);
 313       if (sss)
 314         {
 315           if (spw)
 316             free(spw);
 317           ppp->pw_passwd = spw = SaveStr(sss->sp_pwdp);
 318           endspent();   /* this should delete all buffers ... */
 319           goto pw_try_again;
 320         }
 321       endspent();       /* this should delete all buffers ... */
 322     }
 323 #endif
 324   if (n < 13)
 325     ppp->pw_passwd = 0;
 326 #ifdef linux
 327   if (ppp->pw_passwd && strlen(ppp->pw_passwd) == 13 + 11)
 328     ppp->pw_passwd[13] = 0;     /* beware of linux's long passwords */
 329 #endif
 330
 331   return ppp;
 332 }
 333
 334
 335 int
 336 main(ac, av)
 337 int ac;
 338 char **av;
 339 {
 340   register int n;
 341   char *ap;
 342   char *av0;
 343   char socknamebuf[2 * MAXSTR];
 344   int mflag = 0;
 345   char *myname = (ac == 0) ? "screen" : av[0];
 346   char *SockDir;
 347   struct stat st;
 348 #ifdef _MODE_T                  /* (jw) */
 349   mode_t oumask;
 350 #else
 351   int oumask;
 352 #endif
 353 #if defined(SYSV) && !defined(ISC)
 354   struct utsname utsnam;
 355 #endif
 356   struct NewWindow nwin;
 357   int detached = 0;             /* start up detached */
 358 #ifdef MULTIUSER
 359   char *sockp;
 360 #endif
 361
 362 #if (defined(AUX) || defined(_AUX_SOURCE)) && defined(POSIX)
 363   setcompat(COMPAT_POSIX|COMPAT_BSDPROT); /* turn on seteuid support */
 364 #endif
 365 #if defined(sun) && defined(SVR4)
 366   {
 367     /* Solaris' login blocks SIGHUP! This is _very bad_ */
 368     sigset_t sset;
 369     sigemptyset(&sset);
 370     sigprocmask(SIG_SETMASK, &sset, 0);
 371   }
 372 #endif
 373
 374   /*
 375    *  First, close all unused descriptors
 376    *  (otherwise, we might have problems with the select() call)
 377    */
 378   closeallfiles(0);
 379 #ifdef DEBUG
 380   opendebug(1, 0);
 381 #endif
 382   sprintf(version, "%d.%.2d.%.2d%s (%s) %s", REV, VERS,
 383           PATCHLEVEL, STATE, ORIGIN, DATE);
 384   nversion = REV * 10000 + VERS * 100 + PATCHLEVEL;
 385   debug2("-- screen debug started %s (%s)\n", *av, version);
 386 #ifdef POSIX
 387   debug("POSIX\n");
 388 #endif
 389 #ifdef TERMIO
 390   debug("TERMIO\n");
 391 #endif
 392 #ifdef SYSV
 393   debug("SYSV\n");
 394 #endif
 395 #ifdef SYSVSIGS
 396   debug("SYSVSIGS\n");
 397 #endif
 398 #ifdef NAMEDPIPE
 399   debug("NAMEDPIPE\n");
 400 #endif
 401 #if defined(SIGWINCH) && defined(TIOCGWINSZ)
 402   debug("Window size changing enabled\n");
 403 #endif
 404 #ifdef HAVE_SETREUID
 405   debug("SETREUID\n");
 406 #endif
 407 #ifdef HAVE_SETEUID
 408   debug("SETEUID\n");
 409 #endif
 410 #ifdef hpux
 411   debug("hpux\n");
 412 #endif
 413 #ifdef USEBCOPY
 414   debug("USEBCOPY\n");
 415 #endif
 416 #ifdef UTMPOK
 417   debug("UTMPOK\n");
 418 #endif
 419 #ifdef LOADAV
 420   debug("LOADAV\n");
 421 #endif
 422 #ifdef NETHACK
 423   debug("NETHACK\n");
 424 #endif
 425 #ifdef TERMINFO
 426   debug("TERMINFO\n");
 427 #endif
 428 #ifdef SHADOWPW
 429   debug("SHADOWPW\n");
 430 #endif
 431 #ifdef NAME_MAX
 432   debug1("NAME_MAX = %d\n", NAME_MAX);
 433 #endif
 434
 435   BellString = SaveStr("Bell in window %n");
 436   VisualBellString = SaveStr("   Wuff,  Wuff!!  ");
 437   ActivityString = SaveStr("Activity in window %n");
 438   screenlogfile = SaveStr("screenlog.%n");
 439   logtstamp_string = SaveStr("-- %n:%t -- time-stamp -- %M/%d/%y %c:%s --\n");
 440   hstatusstring = SaveStr("%h");
 441   captionstring = SaveStr("%3n %t");
 442   timestring = SaveStr("%c:%s %M %d %H%? %l%?");
 443   wlisttit = SaveStr("Num Name%=Flags");
 444   wliststr = SaveStr("%3n %t%=%f");
 445 #ifdef COPY_PASTE
 446   BufferFile = SaveStr(DEFAULT_BUFFERFILE);
 447 #endif
 448   ShellProg = NULL;
 449 #ifdef POW_DETACH
 450   PowDetachString = 0;
 451 #endif
 452   default_startup = (ac > 1) ? 0 : 1;
 453   adaptflag = 0;
 454   VBellWait = VBELLWAIT * 1000;
 455   MsgWait = MSGWAIT * 1000;
 456   MsgMinWait = MSGMINWAIT * 1000;
 457   SilenceWait = SILENCEWAIT;
 458 #ifdef HAVE_BRAILLE
 459   InitBraille();
 460 #endif
 461 #ifdef ZMODEM
 462   zmodem_sendcmd = SaveStr("!!! sz -vv -b ");
 463   zmodem_recvcmd = SaveStr("!!! rz -vv -b -E");
 464 #endif
 465
 466 #ifdef COPY_PASTE
 467   CompileKeys((char *)0, 0, mark_key_tab);
 468 #endif
 469 #ifdef UTF8
 470   InitBuiltinTabs();
 471   screenencodings = SaveStr(SCREENENCODINGS);
 472 #endif
 473   nwin = nwin_undef;
 474   nwin_options = nwin_undef;
 475   strcpy(screenterm, "screen");
 476
 477   logreopen_register(lf_secreopen);
 478
 479   av0 = *av;
 480   /* if this is a login screen, assume -RR */
 481   if (*av0 == '-')
 482     {
 483       rflag = 4;
 484 #ifdef MULTI
 485       xflag = 1;
 486 #else
 487       dflag = 1;
 488 #endif
 489       ShellProg = SaveStr(DefaultShell); /* to prevent nasty circles */
 490     }
 491   while (ac > 0)
 492     {
 493       ap = *++av;
 494       if (--ac > 0 && *ap == '-')
 495         {
 496           if (ap[1] == '-' && ap[2] == 0)
 497             {
 498               av++;
 499               ac--;
 500               break;
 501             }
 502           if (ap[1] == '-' && !strcmp(ap, "--version"))
 503             Panic(0, "Screen version %s", version);
 504           if (ap[1] == '-' && !strcmp(ap, "--help"))
 505             exit_with_usage(myname, NULL, NULL);
 506           while (ap && *ap && *++ap)
 507             {
 508               switch (*ap)
 509                 {
 510                 case 'a':
 511                   nwin_options.aflag = 1;
 512                   break;
 513                 case 'A':
 514                   adaptflag = 1;
 515                   break;
 516                 case 'p': /* preselect */
 517                   if (*++ap)
 518                     preselect = ap;
 519                   else
 520                     {
 521                       if (!--ac)
 522                         exit_with_usage(myname, "Specify a window to preselect with -p", NULL);
 523                       preselect = *++av;
 524                     }
 525                   ap = NULL;
 526                   break;
 527 #ifdef HAVE_BRAILLE
 528                 case 'B':
 529                   bd.bd_start_braille = 1;
 530                   break;
 531 #endif
 532                 case 'c':
 533                   if (*++ap)
 534                     RcFileName = ap;
 535                   else
 536                     {
 537                       if (--ac == 0)
 538                         exit_with_usage(myname, "Specify an alternate rc-filename with -c", NULL);
 539                       RcFileName = *++av;
 540                     }
 541                   ap = NULL;
 542                   break;
 543                 case 'e':
 544                   if (!*++ap)
 545                     {
 546                       if (--ac == 0)
 547                         exit_with_usage(myname, "Specify command characters with -e", NULL);
 548                       ap = *++av;
 549                     }
 550                   if (ParseEscape(ap))
 551                     Panic(0, "Two characters are required with -e option, not '%s'.", ap);
 552                   ap = NULL;
 553                   break;
 554                 case 'f':
 555                   ap++;
 556                   switch (*ap++)
 557                     {
 558                     case 'n':
 559                     case '0':
 560                       nwin_options.flowflag = FLOW_NOW * 0;
 561                       break;
 562                     case '\0':
 563                       ap--;
 564                       /* FALLTHROUGH */
 565                     case 'y':
 566                     case '1':
 567                       nwin_options.flowflag = FLOW_NOW * 1;
 568                       break;
 569                     case 'a':
 570                       nwin_options.flowflag = FLOW_AUTOFLAG;
 571                       break;
 572                     default:
 573                       exit_with_usage(myname, "Unknown flow option -%s", --ap);
 574                     }
 575                   break;
 576                 case 'h':
 577                   if (--ac == 0)
 578                     exit_with_usage(myname, NULL, NULL);
 579                   nwin_options.histheight = atoi(*++av);
 580                   if (nwin_options.histheight < 0)
 581                     exit_with_usage(myname, "-h: %s: negative scrollback size?", *av);
 582                   break;
 583                 case 'i':
 584                   iflag = 1;
 585                   break;
 586                 case 't': /* title, the former AkA == -k */
 587                   if (--ac == 0)
 588                     exit_with_usage(myname, "Specify a new window-name with -t", NULL);
 589                   nwin_options.aka = *++av;
 590                   break;
 591                 case 'l':
 592                   ap++;
 593                   switch (*ap++)
 594                     {
 595                     case 'n':
 596                     case '0':
 597                       nwin_options.lflag = 0;
 598                       break;
 599                     case '\0':
 600                       ap--;
 601                       /* FALLTHROUGH */
 602                     case 'y':
 603                     case '1':
 604                       nwin_options.lflag = 1;
 605                       break;
 606                     case 'a':
 607                       nwin_options.lflag = 3;
 608                       break;
 609                     case 's':   /* -ls */
 610                     case 'i':   /* -list */
 611                       lsflag = 1;
 612                       if (ac > 1 && !SockMatch)
 613                         {
 614                           SockMatch = *++av;
 615                           ac--;
 616                         }
 617                       ap = NULL;
 618                       break;
 619                     default:
 620                       exit_with_usage(myname, "%s: Unknown suboption to -l", --ap);
 621                     }
 622                   break;
 623                 case 'w':
 624                   lsflag = 1;
 625                   wipeflag = 1;
 626                   if (ac > 1 && !SockMatch)
 627                     {
 628                       SockMatch = *++av;
 629                       ac--;
 630                     }
 631                   break;
 632                 case 'L':
 633                   nwin_options.Lflag = 1;
 634                   break;
 635                 case 'm':
 636                   mflag = 1;
 637                   break;
 638                 case 'O':               /* to be (or not to be?) deleted. jw. */
 639                   force_vt = 0;
 640                   break;
 641                 case 'T':
 642                   if (--ac == 0)
 643                     exit_with_usage(myname, "Specify terminal-type with -T", NULL);
 644                   if (strlen(*++av) < 20)
 645                     strcpy(screenterm, *av);
 646                   else
 647                     Panic(0, "-T: terminal name too long. (max. 20 char)");
 648                   nwin_options.term = screenterm;
 649                   break;
 650                 case 'q':
 651                   quietflag = 1;
 652                   break;
 653                 case 'r':
 654                 case 'R':
 655 #ifdef MULTI
 656                 case 'x':
 657 #endif
 658                   if (ac > 1 && *av[1] != '-' && !SockMatch)
 659                     {
 660                       SockMatch = *++av;
 661                       ac--;
 662                       debug2("rflag=%d, SockMatch=%s\n", dflag, SockMatch);
 663                     }
 664 #ifdef MULTI
 665                   if (*ap == 'x')
 666                     xflag = 1;
 667 #endif
 668                   if (rflag)
 669                     rflag = 2;
 670                   rflag += (*ap == 'R') ? 2 : 1;
 671                   break;
 672 #ifdef REMOTE_DETACH
 673                 case 'd':
 674                   dflag = 1;
 675                   /* FALLTHROUGH */
 676                 case 'D':
 677                   if (!dflag)
 678                     dflag = 2;
 679                   if (ac == 2)
 680                     {
 681                       if (*av[1] != '-' && !SockMatch)
 682                         {
 683                           SockMatch = *++av;
 684                           ac--;
 685                           debug2("dflag=%d, SockMatch=%s\n", dflag, SockMatch);
 686                         }
 687                     }
 688                   break;
 689 #endif
 690                 case 's':
 691                   if (--ac == 0)
 692                     exit_with_usage(myname, "Specify shell with -s", NULL);
 693                   if (ShellProg)
 694                     free(ShellProg);
 695                   ShellProg = SaveStr(*++av);
 696                   debug1("ShellProg: '%s'\n", ShellProg);
 697                   break;
 698                 case 'S':
 699                   if (!SockMatch)
 700                     {
 701                       if (--ac == 0)
 702                         exit_with_usage(myname, "Specify session-name with -S", NULL);
 703                       SockMatch = *++av;
 704                     }
 705                   if (!*SockMatch)
 706                     exit_with_usage(myname, "Empty session-name?", NULL);
 707                   break;
 708                 case 'X':
 709                   cmdflag = 1;
 710                   break;
 711                 case 'v':
 712                   Panic(0, "Screen version %s", version);
 713                   /* NOTREACHED */
 714 #ifdef UTF8
 715                 case 'U':
 716                   nwin_options.encoding = nwin_options.encoding == -1 ? UTF8 : 0;
 717                   break;
 718 #endif
 719                 default:
 720                   exit_with_usage(myname, "Unknown option %s", --ap);
 721                 }
 722             }
 723         }
 724       else
 725         break;
 726     }
 727
 728   real_uid = getuid();
 729   real_gid = getgid();
 730   eff_uid = geteuid();
 731   eff_gid = getegid();
 732   if (eff_uid != real_uid)
 733     {
 734       /* if running with s-bit, we must install a special signal
 735        * handler routine that resets the s-bit, so that we get a
 736        * core file anyway.
 737        */
 738 #ifdef SIGBUS /* OOPS, linux has no bus errors! */
 739       signal(SIGBUS, CoreDump);
 740 #endif /* SIGBUS */
 741       signal(SIGSEGV, CoreDump);
 742     }
 743
 744 #ifdef USE_LOCALE
 745   setlocale(LC_ALL, "");
 746 #endif
 747 #ifdef ENCODINGS
 748   if (nwin_options.encoding == -1)
 749     {
 750       /* ask locale if we should start in UTF-8 mode */
 751 # ifdef HAVE_NL_LANGINFO
 752 #  ifndef USE_LOCALE
 753       setlocale(LC_CTYPE, "");
 754 #  endif
 755       nwin_options.encoding = FindEncoding(nl_langinfo(CODESET));
 756       debug1("locale says encoding = %d\n", nwin_options.encoding);
 757 # else
 758 #  ifdef UTF8
 759       char *s;
 760       if (((s = getenv("LC_ALL")) || (s = getenv("LC_CTYPE")) ||
 761           (s = getenv("LANG"))) && InStr(s, "UTF-8"))
 762         nwin_options.encoding = UTF8;
 763 #  endif
 764       debug1("environment says encoding=%d\n", nwin_options.encoding);
 765 #endif
 766     }
 767 #endif
 768   if (SockMatch && strlen(SockMatch) >= MAXSTR)
 769     Panic(0, "Ridiculously long socketname - try again.");
 770   if (cmdflag && !rflag && !dflag && !xflag)
 771     xflag = 1;
 772   if (!cmdflag && dflag && mflag && !(rflag || xflag))
 773     detached = 1;
 774   nwin = nwin_options;
 775 #ifdef ENCODINGS
 776   nwin.encoding = nwin_undef.encoding;  /* let screenrc overwrite it */
 777 #endif
 778   if (ac)
 779     nwin.args = av;
 780
 781   /* make the write() calls return -1 on all errors */
 782 #ifdef SIGXFSZ
 783   /*
 784    * Ronald F. Guilmette, Oct 29 '94, bug-gnu-utils@prep.ai.mit.edu:
 785    * It appears that in System V Release 4, UNIX, if you are writing
 786    * an output file and you exceed the currently set file size limit,
 787    * you _don't_ just get the call to `write' returning with a
 788    * failure code.  Rather, you get a signal called `SIGXFSZ' which,
 789    * if neither handled nor ignored, will cause your program to crash
 790    * with a core dump.
 791    */
 792   signal(SIGXFSZ, SIG_IGN);
 793 #endif /* SIGXFSZ */
 794
 795 #ifdef SIGPIPE
 796   signal(SIGPIPE, SIG_IGN);
 797 #endif
 798
 799   if (!ShellProg)
 800     {
 801       register char *sh;
 802
 803       sh = getenv("SHELL");
 804       ShellProg = SaveStr(sh ? sh : DefaultShell);
 805     }
 806   ShellArgs[0] = ShellProg;
 807   home = getenv("HOME");
 808
 809 #ifdef NETHACK
 810   if (!(nethackflag = (getenv("NETHACKOPTIONS") != NULL)))
 811     {
 812       char nethackrc[MAXPATHLEN];
 813
 814       if (home && (strlen(home) < (MAXPATHLEN - 20)))
 815         {
 816           sprintf(nethackrc,"%s/.nethackrc", home);
 817           nethackflag = !access(nethackrc, F_OK);
 818         }
 819     }
 820 #endif
 821
 822 #ifdef MULTIUSER
 823   own_uid = multi_uid = real_uid;
 824   if (SockMatch && (sockp = index(SockMatch, '/')))
 825     {
 826       if (eff_uid)
 827         Panic(0, "Must run suid root for multiuser support.");
 828       *sockp = 0;
 829       multi = SockMatch;
 830       SockMatch = sockp + 1;
 831       if (*multi)
 832         {
 833           struct passwd *mppp;
 834           if ((mppp = getpwnam(multi)) == (struct passwd *)0)
 835             Panic(0, "Cannot identify account '%s'.", multi);
 836           multi_uid = mppp->pw_uid;
 837           multi_home = SaveStr(mppp->pw_dir);
 838           if (strlen(multi_home) > MAXPATHLEN - 10)
 839             Panic(0, "home directory path too long");
 840 # ifdef MULTI
 841           /* always fake multi attach mode */
 842           if (rflag || lsflag)
 843             xflag = 1;
 844 # endif /* MULTI */
 845           detached = 0;
 846           multiattach = 1;
 847         }
 848     }
 849   if (SockMatch && *SockMatch == 0)
 850     SockMatch = 0;
 851 #endif /* MULTIUSER */
 852
 853   if ((LoginName = getlogin()) && LoginName[0] != '\0')
 854     {
 855       if ((ppp = getpwnam(LoginName)) != (struct passwd *) 0)
 856         if ((int)ppp->pw_uid != real_uid)
 857           ppp = (struct passwd *) 0;
 858     }
 859   if (ppp == 0)
 860     {
 861       if ((ppp = getpwuid(real_uid)) == 0)
 862         {
 863           Panic(0, "getpwuid() can't identify your account!");
 864           exit(1);
 865         }
 866       LoginName = ppp->pw_name;
 867     }
 868   LoginName = SaveStr(LoginName);
 869
 870   ppp = getpwbyname(LoginName, ppp);
 871
 872 #if !defined(SOCKDIR) && defined(MULTIUSER)
 873   if (multi && !multiattach)
 874     {
 875       if (home && strcmp(home, ppp->pw_dir))
 876         Panic(0, "$HOME must match passwd entry for multiuser screens.");
 877     }
 878 #endif
 879
 880   if (home == 0 || *home == '\0')
 881     home = ppp->pw_dir;
 882   if (strlen(LoginName) > 20)
 883     Panic(0, "LoginName too long - sorry.");
 884 #ifdef MULTIUSER
 885   if (multi && strlen(multi) > 20)
 886     Panic(0, "Screen owner name too long - sorry.");
 887 #endif
 888   if (strlen(home) > MAXPATHLEN - 25)
 889     Panic(0, "$HOME too long - sorry.");
 890
 891   attach_tty = "";
 892   if (!detached && !lsflag && !cmdflag && !(dflag && !mflag && !rflag && !xflag))
 893     {
 894 #ifndef NAMEDPIPE
 895       int fl;
 896 #endif
 897
 898       /* ttyname implies isatty */
 899       if (!(attach_tty = ttyname(0)))
 900         Panic(0, "Must be connected to a terminal.");
 901       if (strlen(attach_tty) >= MAXPATHLEN)
 902         Panic(0, "TtyName too long - sorry.");
 903       if (stat(attach_tty, &st))
 904         Panic(errno, "Cannot access '%s'", attach_tty);
 905 #ifdef MULTIUSER
 906       tty_mode = (int)st.st_mode & 0777;
 907 #endif
 908
 909 #ifndef NAMEDPIPE
 910       fl = fcntl(0, F_GETFL, 0);
 911       if (fl != -1 && (fl & (O_RDWR|O_RDONLY|O_WRONLY)) == O_RDWR)
 912         attach_fd = 0;
 913 #endif
 914       if (attach_fd == -1)
 915         {
 916           if ((n = secopen(attach_tty, O_RDWR | O_NONBLOCK, 0)) < 0)
 917             Panic(0, "Cannot open your terminal '%s' - please check.", attach_tty);
 918           close(n);
 919         }
 920       debug2("attach_tty is %s, attach_fd is %d\n", attach_tty, attach_fd);
 921
 922       if ((attach_term = getenv("TERM")) == 0 || *attach_term == 0)
 923         Panic(0, "Please set a terminal type.");
 924       if (strlen(attach_term) > sizeof(D_termname) - 1)
 925         Panic(0, "$TERM too long - sorry.");
 926       GetTTY(0, &attach_Mode);
 927 #ifdef DEBUGGGGGGGGGGGGGGG
 928       DebugTTY(&attach_Mode);
 929 #endif /* DEBUG */
 930     }
 931
 932 #ifdef _MODE_T
 933   oumask = umask(0);            /* well, unsigned never fails? jw. */
 934 #else
 935   if ((oumask = (int)umask(0)) == -1)
 936     Panic(errno, "Cannot change umask to zero");
 937 #endif
 938   SockDir = getenv("SCREENDIR");
 939   if (SockDir)
 940     {
 941       if (strlen(SockDir) >= MAXPATHLEN - 1)
 942         Panic(0, "Ridiculously long $SCREENDIR - try again.");
 943 #ifdef MULTIUSER
 944       if (multi)
 945         Panic(0, "No $SCREENDIR with multi screens, please.");
 946 #endif
 947     }
 948 #ifdef MULTIUSER
 949   if (multiattach)
 950     {
 951 # ifndef SOCKDIR
 952       sprintf(SockPath, "%s/.screen", multi_home);
 953       SockDir = SockPath;
 954 # else
 955       SockDir = SOCKDIR;
 956       sprintf(SockPath, "%s/S-%s", SockDir, multi);
 957 # endif
 958     }
 959   else
 960 #endif
 961     {
 962 #ifndef SOCKDIR
 963       if (SockDir == 0)
 964         {
 965           sprintf(SockPath, "%s/.screen", home);
 966           SockDir = SockPath;
 967         }
 968 #endif
 969       if (SockDir)
 970         {
 971           if (access(SockDir, F_OK))
 972             {
 973               debug1("SockDir '%s' missing ...\n", SockDir);
 974               if (UserContext() > 0)
 975                 {
 976                   if (mkdir(SockDir, 0700))
 977                     UserReturn(0);
 978                   UserReturn(1);
 979                 }
 980               if (UserStatus() <= 0)
 981                 Panic(0, "Cannot make directory '%s'.", SockDir);
 982             }
 983           if (SockDir != SockPath)
 984             strcpy(SockPath, SockDir);
 985         }
 986 #ifdef SOCKDIR
 987       else
 988         {
 989           SockDir = SOCKDIR;
 990           if (lstat(SockDir, &st))
 991             {
 992               n = (eff_uid == 0 && (real_uid || eff_gid == real_gid)) ? 0755 :
 993                   (eff_gid != real_gid) ? 0775 :
 994 #ifdef S_ISVTX
 995                   0777|S_ISVTX;
 996 #else
 997                   0777;
 998 #endif
 999               if (mkdir(SockDir, n) == -1)
1000                 Panic(errno, "Cannot make directory '%s'", SockDir);
1001             }
1002           else
1003             {
1004               if (!S_ISDIR(st.st_mode))
1005                 Panic(0, "'%s' must be a directory.", SockDir);
1006               if (eff_uid == 0 && real_uid && (int)st.st_uid != eff_uid)
1007                 Panic(0, "Directory '%s' must be owned by root.", SockDir);
1008               n = (eff_uid == 0 && (real_uid || (st.st_mode & 0775) != 0775)) ? 0755 :
1009                   (eff_gid == (int)st.st_gid && eff_gid != real_gid) ? 0775 :
1010                   0777;
1011               if (((int)st.st_mode & 0777) != n)
1012                 Panic(0, "Directory '%s' must have mode %03o.", SockDir, n);
1013             }
1014           sprintf(SockPath, "%s/S-%s", SockDir, LoginName);
1015           if (access(SockPath, F_OK))
1016             {
1017               if (mkdir(SockPath, 0700) == -1)
1018                 Panic(errno, "Cannot make directory '%s'", SockPath);
1019               (void) chown(SockPath, real_uid, real_gid);
1020             }
1021         }
1022 #endif
1023     }
1024
1025   if (stat(SockPath, &st) == -1)
1026     Panic(errno, "Cannot access %s", SockPath);
1027   else
1028   if (!S_ISDIR(st.st_mode))
1029     Panic(0, "%s is not a directory.", SockPath);
1030 #ifdef MULTIUSER
1031   if (multi)
1032     {
1033       if ((int)st.st_uid != multi_uid)
1034         Panic(0, "%s is not the owner of %s.", multi, SockPath);
1035     }
1036   else
1037 #endif
1038     {
1039       if ((int)st.st_uid != real_uid)
1040         Panic(0, "You are not the owner of %s.", SockPath);
1041     }
1042   if ((st.st_mode & 0777) != 0700)
1043     Panic(0, "Directory %s must have mode 700.", SockPath);
1044   if (SockMatch && index(SockMatch, '/'))
1045     Panic(0, "Bad session name '%s'", SockMatch);
1046   SockName = SockPath + strlen(SockPath) + 1;
1047   *SockName = 0;
1048   (void) umask(oumask);
1049   debug2("SockPath: %s  SockMatch: %s\n", SockPath, SockMatch ? SockMatch : "NULL");
1050
1051 #if defined(SYSV) && !defined(ISC)
1052   if (uname(&utsnam) == -1)
1053     Panic(errno, "uname");
1054   strncpy(HostName, utsnam.nodename, sizeof(utsnam.nodename) < MAXSTR ? sizeof(utsnam.nodename) : MAXSTR - 1);
1055   HostName[sizeof(utsnam.nodename) < MAXSTR ? sizeof(utsnam.nodename) : MAXSTR - 1] = '\0';
1056 #else
1057   (void) gethostname(HostName, MAXSTR);
1058   HostName[MAXSTR - 1] = '\0';
1059 #endif
1060   if ((ap = index(HostName, '.')) != NULL)
1061     *ap = '\0';
1062
1063   if (lsflag)
1064     {
1065       int i, fo, oth;
1066
1067 #ifdef MULTIUSER
1068       if (multi)
1069         real_uid = multi_uid;
1070 #endif
1071       setgid(real_gid);
1072       setuid(real_uid);
1073       eff_uid = real_uid;
1074       eff_gid = real_gid;
1075       i = FindSocket((int *)NULL, &fo, &oth, SockMatch);
1076       if (quietflag)
1077         exit(8 + (fo ? ((oth || i) ? 2 : 1) : 0) + i);
1078       if (fo == 0)
1079         Panic(0, "No Sockets found in %s.\n", SockPath);
1080       Panic(0, "%d Socket%s in %s.\n", fo, fo > 1 ? "s" : "", SockPath);
1081       /* NOTREACHED */
1082     }
1083   signal(SIG_BYE, AttacherFinit);       /* prevent races */
1084   if (cmdflag)
1085     {
1086       char *sty = 0;
1087
1088       /* attach_tty is not mandatory */
1089       if ((attach_tty = ttyname(0)) == 0)
1090         attach_tty = "";
1091       if (strlen(attach_tty) >= MAXPATHLEN)
1092         Panic(0, "TtyName too long - sorry.");
1093       if (!*av)
1094         Panic(0, "Please specify a command.");
1095       setgid(real_gid);
1096       setuid(real_uid);
1097       eff_uid = real_uid;
1098       eff_gid = real_gid;
1099       if (!mflag && !SockMatch)
1100         {
1101           sty = getenv("STY");
1102           if (sty && *sty == 0)
1103             sty = 0;
1104         }
1105       SendCmdMessage(sty, SockMatch, av);
1106       exit(0);
1107     }
1108   else if (rflag || xflag)
1109     {
1110       debug("screen -r: - is there anybody out there?\n");
1111       if (Attach(MSG_ATTACH))
1112         {
1113           Attacher();
1114           /* NOTREACHED */
1115         }
1116 #ifdef MULTIUSER
1117       if (multiattach)
1118         Panic(0, "Can't create sessions of other users.");
1119 #endif
1120       debug("screen -r: backend not responding -- still crying\n");
1121     }
1122   else if (dflag && !mflag)
1123     {
1124       (void) Attach(MSG_DETACH);
1125       Msg(0, "[%s %sdetached.]\n", SockName, (dflag > 1 ? "power " : ""));
1126       eexit(0);
1127       /* NOTREACHED */
1128     }
1129   if (!SockMatch && !mflag)
1130     {
1131       register char *sty;
1132
1133       if ((sty = getenv("STY")) != 0 && *sty != '\0')
1134         {
1135           setgid(real_gid);
1136           setuid(real_uid);
1137           eff_uid = real_uid;
1138           eff_gid = real_gid;
1139           nwin_options.args = av;
1140           SendCreateMsg(sty, &nwin);
1141           exit(0);
1142           /* NOTREACHED */
1143         }
1144     }
1145   nwin_compose(&nwin_default, &nwin_options, &nwin_default);
1146
1147   if (!detached || dflag != 2)
1148     MasterPid = fork();
1149   else
1150     MasterPid = 0;
1151
1152   switch (MasterPid)
1153     {
1154     case -1:
1155       Panic(errno, "fork");
1156       /* NOTREACHED */
1157     case 0:
1158       break;
1159     default:
1160       if (detached)
1161         exit(0);
1162       if (SockMatch)
1163         sprintf(socknamebuf, "%d.%s", MasterPid, SockMatch);
1164       else
1165         sprintf(socknamebuf, "%d.%s.%s", MasterPid, stripdev(attach_tty), HostName);
1166       for (ap = socknamebuf; *ap; ap++)
1167         if (*ap == '/')
1168           *ap = '-';
1169 #ifdef NAME_MAX
1170       if (strlen(socknamebuf) > NAME_MAX)
1171         socknamebuf[NAME_MAX] = 0;
1172 #endif
1173       sprintf(SockPath + strlen(SockPath), "/%s", socknamebuf);
1174       setgid(real_gid);
1175       setuid(real_uid);
1176       eff_uid = real_uid;
1177       eff_gid = real_gid;
1178       Attacher();
1179       /* NOTREACHED */
1180     }
1181
1182   if (!detached)
1183     PanicPid = getppid();
1184
1185   if (DefaultEsc == -1)
1186     DefaultEsc = Ctrl('a');
1187   if (DefaultMetaEsc == -1)
1188     DefaultMetaEsc = 'a';
1189
1190   ap = av0 + strlen(av0) - 1;
1191   while (ap >= av0)
1192     {
1193       if (!strncmp("screen", ap, 6))
1194         {
1195           strncpy(ap, "SCREEN", 6); /* name this process "SCREEN-BACKEND" */
1196           break;
1197         }
1198       ap--;
1199     }
1200   if (ap < av0)
1201     *av0 = 'S';
1202
1203 #ifdef DEBUG
1204   {
1205     char buf[256];
1206
1207     if (dfp && dfp != stderr)
1208       fclose(dfp);
1209     sprintf(buf, "%s/SCREEN.%d", DEBUGDIR, (int)getpid());
1210     if ((dfp = fopen(buf, "w")) == NULL)
1211       dfp = stderr;
1212     else
1213       (void) chmod(buf, 0666);
1214   }
1215 #endif
1216   if (!detached)
1217     {
1218       if (attach_fd == -1)
1219         {
1220           if ((n = secopen(attach_tty, O_RDWR, 0)) < 0)
1221             Panic(0, "Cannot reopen '%s' - please check.", attach_tty);
1222         }
1223       else
1224         n = dup(attach_fd);
1225     }
1226   else
1227     n = -1;
1228   freopen("/dev/null", "r", stdin);
1229   freopen("/dev/null", "w", stdout);
1230
1231 #ifdef DEBUG
1232   if (dfp != stderr)
1233 #endif
1234   freopen("/dev/null", "w", stderr);
1235   debug("-- screen.back debug started\n");
1236
1237   /*
1238    * This guarantees that the session owner is listed, even when we
1239    * start detached. From now on we should not refer to 'LoginName'
1240    * any more, use users->u_name instead.
1241    */
1242   if (UserAdd(LoginName, (char *)0, (struct acluser **)0) < 0)
1243     Panic(0, "Could not create user info");
1244   if (!detached)
1245     {
1246       if (MakeDisplay(LoginName, attach_tty, attach_term, n, getppid(), &attach_Mode) == 0)
1247         Panic(0, "Could not alloc display");
1248       PanicPid = 0;
1249 #ifdef ENCODINGS
1250       D_encoding = nwin_options.encoding > 0 ? nwin_options.encoding : 0;
1251       debug1("D_encoding = %d\n", D_encoding);
1252 #endif
1253     }
1254
1255   if (SockMatch)
1256     {
1257       /* user started us with -S option */
1258       sprintf(socknamebuf, "%d.%s", (int)getpid(), SockMatch);
1259     }
1260   else
1261     {
1262       sprintf(socknamebuf, "%d.%s.%s", (int)getpid(), stripdev(attach_tty),
1263               HostName);
1264     }
1265   for (ap = socknamebuf; *ap; ap++)
1266     if (*ap == '/')
1267       *ap = '-';
1268 #ifdef NAME_MAX
1269   if (strlen(socknamebuf) > NAME_MAX)
1270     {
1271       debug2("Socketname %s truncated to %d chars\n", socknamebuf, NAME_MAX);
1272       socknamebuf[NAME_MAX] = 0;
1273     }
1274 #endif
1275   sprintf(SockPath + strlen(SockPath), "/%s", socknamebuf);
1276
1277   ServerSocket = MakeServerSocket();
1278   InitKeytab();
1279 #ifdef ETCSCREENRC
1280 # ifdef ALLOW_SYSSCREENRC
1281   if ((ap = getenv("SYSSCREENRC")))
1282     (void)StartRc(ap, 0);
1283   else
1284 # endif
1285     (void)StartRc(ETCSCREENRC, 0);
1286 #endif
1287   (void)StartRc(RcFileName, 0);
1288 # ifdef UTMPOK
1289 #  ifndef UTNOKEEP
1290   InitUtmp();
1291 #  endif /* UTNOKEEP */
1292 # endif /* UTMPOK */
1293   if (display)
1294     {
1295       if (InitTermcap(0, 0))
1296         {
1297           debug("Could not init termcap - exiting\n");
1298           fcntl(D_userfd, F_SETFL, 0);  /* Flush sets FNBLOCK */
1299           freetty();
1300           if (D_userpid)
1301             Kill(D_userpid, SIG_BYE);
1302           eexit(1);
1303         }
1304       MakeDefaultCanvas();
1305       InitTerm(0);
1306 #ifdef UTMPOK
1307       RemoveLoginSlot();
1308 #endif
1309     }
1310   else
1311     MakeTermcap(1);
1312 #ifdef LOADAV
1313   InitLoadav();
1314 #endif /* LOADAV */
1315   MakeNewEnv();
1316   signal(SIGHUP, SigHup);
1317   signal(SIGINT, FinitHandler);
1318   signal(SIGQUIT, FinitHandler);
1319   signal(SIGTERM, FinitHandler);
1320 #ifdef BSDJOBS
1321   signal(SIGTTIN, SIG_IGN);
1322   signal(SIGTTOU, SIG_IGN);
1323 #endif
1324
1325   if (display)
1326     {
1327       brktty(D_userfd);
1328       SetMode(&D_OldMode, &D_NewMode, D_flow, iflag);
1329       /* Note: SetMode must be called _before_ FinishRc. */
1330       SetTTY(D_userfd, &D_NewMode);
1331       if (fcntl(D_userfd, F_SETFL, FNBLOCK))
1332         Msg(errno, "Warning: NBLOCK fcntl failed");
1333     }
1334   else
1335     brktty(-1);         /* just try */
1336   signal(SIGCHLD, SigChld);
1337 #ifdef ETCSCREENRC
1338 # ifdef ALLOW_SYSSCREENRC
1339   if ((ap = getenv("SYSSCREENRC")))
1340     FinishRc(ap);
1341   else
1342 # endif
1343     FinishRc(ETCSCREENRC);
1344 #endif
1345   FinishRc(RcFileName);
1346
1347   debug2("UID %d  EUID %d\n", (int)getuid(), (int)geteuid());
1348   if (windows == NULL)
1349     {
1350       debug("We open one default window, as screenrc did not specify one.\n");
1351       if (MakeWindow(&nwin) == -1)
1352         {
1353           Msg(0, "Sorry, could not find a PTY.");
1354           sleep(5);
1355           Finit(0);
1356           /* NOTREACHED */
1357         }
1358     }
1359
1360 #ifdef HAVE_BRAILLE
1361   StartBraille();
1362 #endif
1363
1364   if (display && default_startup)
1365     display_copyright();
1366   signal(SIGINT, SigInt);
1367   if (rflag && (rflag & 1) == 0 && !quietflag)
1368     {
1369       Msg(0, "New screen...");
1370       rflag = 0;
1371     }
1372
1373   serv_read.type = EV_READ;
1374   serv_read.fd = ServerSocket;
1375   serv_read.handler = serv_read_fn;
1376   evenq(&serv_read);
1377
1378   serv_select.pri = -10;
1379   serv_select.type = EV_ALWAYS;
1380   serv_select.handler = serv_select_fn;
1381   evenq(&serv_select);
1382
1383   logflushev.type = EV_TIMEOUT;
1384   logflushev.handler = logflush_fn;
1385
1386   sched();
1387   /* NOTREACHED */
1388   return 0;
1389 }
1390
1391 void
1392 WindowDied(p, wstat, wstat_valid)
1393 struct win *p;
1394 int wstat;
1395 int wstat_valid;
1396 {
1397   int killit = 0;
1398
1399   if (ZombieKey_destroy && ZombieKey_onerror && wstat_valid &&
1400       WIFEXITED(wstat) && WEXITSTATUS(wstat) == 0)
1401         killit = 1;
1402
1403   if (ZombieKey_destroy && !killit)
1404     {
1405       char buf[100], *s, reason[100];
1406       time_t now;
1407
1408       if (wstat_valid) {
1409         if (WIFEXITED(wstat))
1410           if (WEXITSTATUS(wstat))
1411             sprintf(reason, "terminated with exit status %d", WEXITSTATUS(wstat));
1412           else
1413             sprintf(reason, "terminated normally");
1414         else if (WIFSIGNALED(wstat))
1415           sprintf(reason, "terminated with signal %d%s", WTERMSIG(wstat),
1416 #ifdef WCOREDUMP
1417                           WCOREDUMP(wstat) ? " (core file generated)" : "");
1418 #else
1419                           "");
1420 #endif
1421       } else
1422         sprintf(reason, "detached from window");
1423
1424       (void) time(&now);
1425       s = ctime(&now);
1426       if (s && *s)
1427         s[strlen(s) - 1] = '\0';
1428       debug3("window %d (%s) going into zombie state fd %d",
1429              p->w_number, p->w_title, p->w_ptyfd);
1430 #ifdef UTMPOK
1431       if (p->w_slot != (slot_t)0 && p->w_slot != (slot_t)-1)
1432         {
1433           RemoveUtmp(p);
1434           p->w_slot = 0;        /* "detached" */
1435         }
1436 #endif
1437       CloseDevice(p);
1438
1439       p->w_deadpid = p->w_pid;
1440       p->w_pid = 0;
1441       ResetWindow(p);
1442       /* p->w_y = p->w_bot; */
1443       p->w_y = MFindUsedLine(p, p->w_bot, 1);
1444       sprintf(buf, "\n\r=== Command %s (%s) ===", reason, s ? s : "?");
1445       WriteString(p, buf, strlen(buf));
1446       WindowChanged(p, 'f');
1447     }
1448   else
1449     KillWindow(p);
1450 #ifdef UTMPOK
1451   CarefulUtmp();
1452 #endif
1453 }
1454
1455 static void
1456 SigChldHandler()
1457 {
1458   struct stat st;
1459 #ifdef DEBUG
1460   fds();
1461 #endif
1462   while (GotSigChld)
1463     {
1464       GotSigChld = 0;
1465       DoWait();
1466 #ifdef SYSVSIGS
1467       signal(SIGCHLD, SigChld);
1468 #endif
1469     }
1470   if (stat(SockPath, &st) == -1)
1471     {
1472       debug1("SigChldHandler: Yuck! cannot stat '%s'\n", SockPath);
1473       if (!RecoverSocket())
1474         {
1475           debug("SCREEN cannot recover from corrupt Socket, bye\n");
1476           Finit(1);
1477         }
1478       else
1479         debug1("'%s' reconstructed\n", SockPath);
1480     }
1481   else
1482     debug2("SigChldHandler: stat '%s' o.k. (%03o)\n", SockPath, (int)st.st_mode);
1483 }
1484
1485 static sigret_t
1486 SigChld SIGDEFARG
1487 {
1488   debug("SigChld()\n");
1489   GotSigChld = 1;
1490   SIGRETURN;
1491 }
1492
1493 sigret_t
1494 SigHup SIGDEFARG
1495 {
1496   /* Hangup all displays */
1497   while ((display = displays) != 0)
1498     Hangup();
1499   SIGRETURN;
1500 }
1501
1502 /*
1503  * the backend's Interrupt handler
1504  * we cannot insert the intrc directly, as we never know
1505  * if fore is valid.
1506  */
1507 static sigret_t
1508 SigInt SIGDEFARG
1509 {
1510 #if HAZARDOUS
1511   char ibuf;
1512
1513   debug("SigInt()\n");
1514   if (fore && displays)
1515     {
1516 # if defined(TERMIO) || defined(POSIX)
1517       ibuf = displays->d_OldMode.tio.c_cc[VINTR];
1518 # else
1519       ibuf = displays->d_OldMode.m_tchars.t_intrc;
1520 # endif
1521       fore->w_inlen = 0;
1522       write(fore->w_ptyfd, &ibuf, 1);
1523     }
1524 #else
1525   signal(SIGINT, SigInt);
1526   debug("SigInt() careful\n");
1527   InterruptPlease = 1;
1528 #endif
1529   SIGRETURN;
1530 }
1531
1532 static sigret_t
1533 CoreDump SIGDEFARG
1534 {
1535   struct display *disp;
1536   char buf[80];
1537
1538 #if defined(SYSVSIGS) && defined(SIGHASARG)
1539   signal(sigsig, SIG_IGN);
1540 #endif
1541   setgid(getgid());
1542   setuid(getuid());
1543   unlink("core");
1544 #ifdef SIGHASARG
1545   sprintf(buf, "\r\n[screen caught signal %d.%s]\r\n", sigsig,
1546 #else
1547   sprintf(buf, "\r\n[screen caught a fatal signal.%s]\r\n",
1548 #endif
1549 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1550               ""
1551 #else /* SHADOWPW  && !DEBUG */
1552               " (core dumped)"
1553 #endif /* SHADOWPW  && !DEBUG */
1554               );
1555   for (disp = displays; disp; disp = disp->d_next)
1556     {
1557       fcntl(disp->d_userfd, F_SETFL, 0);
1558       SetTTY(disp->d_userfd, &D_OldMode);
1559       write(disp->d_userfd, buf, strlen(buf));
1560       Kill(disp->d_userpid, SIG_BYE);
1561     }
1562 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1563   Kill(getpid(), SIGKILL);
1564   eexit(11);
1565 #else /* SHADOWPW && !DEBUG */
1566   abort();
1567 #endif /* SHADOWPW  && !DEBUG */
1568   SIGRETURN;
1569 }
1570
1571 static void
1572 DoWait()
1573 {
1574   register int pid;
1575   struct win *p, *next;
1576 #ifdef BSDWAIT
1577   union wait wstat;
1578 #else
1579   int wstat;
1580 #endif
1581
1582 #ifdef BSDJOBS
1583 # ifndef BSDWAIT
1584   while ((pid = waitpid(-1, &wstat, WNOHANG | WUNTRACED)) > 0)
1585 # else
1586 # ifdef USE_WAIT2
1587   /*
1588    * From: rouilj@sni-usa.com (John Rouillard)
1589    * note that WUNTRACED is not documented to work, but it is defined in
1590    * /usr/include/sys/wait.h, so it may work
1591    */
1592   while ((pid = wait2(&wstat, WNOHANG | WUNTRACED )) > 0)
1593 #  else /* USE_WAIT2 */
1594   while ((pid = wait3(&wstat, WNOHANG | WUNTRACED, (struct rusage *) 0)) > 0)
1595 #  endif /* USE_WAIT2 */
1596 # endif
1597 #else   /* BSDJOBS */
1598   while ((pid = wait(&wstat)) < 0)
1599     if (errno != EINTR)
1600       break;
1601   if (pid > 0)
1602 #endif  /* BSDJOBS */
1603     {
1604       for (p = windows; p; p = next)
1605         {
1606           next = p->w_next;
1607           if (  (p->w_pid     && pid == p->w_pid) ||
1608                 (p->w_deadpid && pid == p->w_deadpid) )
1609             {
1610               /* child has ceased to exist */
1611               p->w_pid = 0;
1612
1613 #ifdef BSDJOBS
1614               if (WIFSTOPPED(wstat))
1615                 {
1616                   debug3("Window %d pid %d: WIFSTOPPED (sig %d)\n", p->w_number, pid, WSTOPSIG(wstat));
1617 #ifdef SIGTTIN
1618                   if (WSTOPSIG(wstat) == SIGTTIN)
1619                     {
1620                       Msg(0, "Suspended (tty input)");
1621                       continue;
1622                     }
1623 #endif
1624 #ifdef SIGTTOU
1625                   if (WSTOPSIG(wstat) == SIGTTOU)
1626                     {
1627                       Msg(0, "Suspended (tty output)");
1628                       continue;
1629                     }
1630 #endif
1631                   /* Try to restart process */
1632                   Msg(0, "Child has been stopped, restarting.");
1633                   if (killpg(pid, SIGCONT))
1634                     kill(pid, SIGCONT);
1635                 }
1636               else
1637 #endif
1638                 {
1639                   WindowDied(p, wstat, 1);
1640                 }
1641               break;
1642             }
1643 #ifdef PSEUDOS
1644           if (p->w_pwin && pid == p->w_pwin->p_pid)
1645             {
1646               debug2("pseudo of win Nr %d died. pid == %d\n", p->w_number, p->w_pwin->p_pid);
1647               FreePseudowin(p);
1648               break;
1649             }
1650 #endif
1651         }
1652       if (p == 0)
1653         {
1654           debug1("pid %d not found - hope that's ok\n", pid);
1655         }
1656     }
1657 }
1658
1659
1660 static sigret_t
1661 FinitHandler SIGDEFARG
1662 {
1663 #ifdef SIGHASARG
1664   debug1("FinitHandler called, sig %d.\n", sigsig);
1665 #else
1666   debug("FinitHandler called.\n");
1667 #endif
1668   Finit(1);
1669   SIGRETURN;
1670 }
1671
1672 void
1673 Finit(i)
1674 int i;
1675 {
1676   signal(SIGCHLD, SIG_DFL);
1677   signal(SIGHUP, SIG_IGN);
1678   debug1("Finit(%d);\n", i);
1679   while (windows)
1680     {
1681       struct win *p = windows;
1682       windows = windows->w_next;
1683       FreeWindow(p);
1684     }
1685   if (ServerSocket != -1)
1686     {
1687       debug1("we unlink(%s)\n", SockPath);
1688 #ifdef USE_SETEUID
1689       xseteuid(real_uid);
1690       xsetegid(real_gid);
1691 #endif
1692       (void) unlink(SockPath);
1693 #ifdef USE_SETEUID
1694       xseteuid(eff_uid);
1695       xsetegid(eff_gid);
1696 #endif
1697     }
1698   for (display = displays; display; display = display->d_next)
1699     {
1700       if (D_status)
1701         RemoveStatus();
1702       FinitTerm();
1703 #ifdef UTMPOK
1704       RestoreLoginSlot();
1705 #endif
1706       AddStr("[screen is terminating]\r\n");
1707       Flush();
1708       SetTTY(D_userfd, &D_OldMode);
1709       fcntl(D_userfd, F_SETFL, 0);
1710       freetty();
1711       Kill(D_userpid, SIG_BYE);
1712     }
1713   /*
1714    * we _cannot_ call eexit(i) here,
1715    * instead of playing with the Socket above. Sigh.
1716    */
1717   exit(i);
1718 }
1719
1720 void
1721 eexit(e)
1722 int e;
1723 {
1724   debug("eexit\n");
1725   if (ServerSocket != -1)
1726     {
1727       debug1("we unlink(%s)\n", SockPath);
1728       setgid(real_gid);
1729       setuid(real_uid);
1730       (void) unlink(SockPath);
1731     }
1732   exit(e);
1733 }
1734
1735 void
1736 Hangup()
1737 {
1738   if (display == 0)
1739     return;
1740   debug1("Hangup %x\n", display);
1741   if (D_userfd >= 0)
1742     {
1743       close(D_userfd);
1744       D_userfd = -1;
1745     }
1746   if (auto_detach || displays->d_next)
1747     Detach(D_HANGUP);
1748   else
1749     Finit(0);
1750 }
1751
1752 /*
1753  * Detach now has the following modes:
1754  *D_DETACH       SIG_BYE        detach backend and exit attacher
1755  *D_HANGUP       SIG_BYE        detach backend and exit attacher
1756  *D_STOP         SIG_STOP       stop attacher (and detach backend)
1757  *D_REMOTE       SIG_BYE        remote detach -- reattach to new attacher
1758  *D_POWER        SIG_POWER_BYE  power detach -- attacher kills his parent
1759  *D_REMOTE_POWER SIG_POWER_BYE  remote power detach -- both
1760  *D_LOCK         SIG_LOCK       lock the attacher
1761  * (jw)
1762  * we always remove our utmp slots. (even when "lock" or "stop")
1763  * Note: Take extra care here, we may be called by interrupt!
1764  */
1765 void
1766 Detach(mode)
1767 int mode;
1768 {
1769   int sign = 0, pid;
1770   struct canvas *cv;
1771   struct win *p;
1772
1773   if (display == 0)
1774     return;
1775
1776   signal(SIGHUP, SIG_IGN);
1777   debug1("Detach(%d)\n", mode);
1778   if (D_status)
1779     RemoveStatus();
1780   FinitTerm();
1781   if (!display)
1782     return;
1783   switch (mode)
1784     {
1785     case D_HANGUP:
1786       sign = SIG_BYE;
1787       break;
1788     case D_DETACH:
1789       AddStr("[detached]\r\n");
1790       sign = SIG_BYE;
1791       break;
1792 #ifdef BSDJOBS
1793     case D_STOP:
1794       sign = SIG_STOP;
1795       break;
1796 #endif
1797 #ifdef REMOTE_DETACH
1798     case D_REMOTE:
1799       AddStr("[remote detached]\r\n");
1800       sign = SIG_BYE;
1801       break;
1802 #endif
1803 #ifdef POW_DETACH
1804     case D_POWER:
1805       AddStr("[power detached]\r\n");
1806       if (PowDetachString)
1807         {
1808           AddStr(PowDetachString);
1809           AddStr("\r\n");
1810         }
1811       sign = SIG_POWER_BYE;
1812       break;
1813 #ifdef REMOTE_DETACH
1814     case D_REMOTE_POWER:
1815       AddStr("[remote power detached]\r\n");
1816       if (PowDetachString)
1817         {
1818           AddStr(PowDetachString);
1819           AddStr("\r\n");
1820         }
1821       sign = SIG_POWER_BYE;
1822       break;
1823 #endif
1824 #endif
1825     case D_LOCK:
1826       ClearAll();
1827       sign = SIG_LOCK;
1828       /* tell attacher to lock terminal with a lockprg. */
1829       break;
1830     }
1831 #ifdef UTMPOK
1832   if (displays->d_next == 0)
1833     {
1834       for (p = windows; p; p = p->w_next)
1835         {
1836           if (p->w_slot != (slot_t) -1 && !(p->w_lflag & 2))
1837             {
1838               RemoveUtmp(p);
1839               /*
1840                * Set the slot to 0 to get the window
1841                * logged in again.
1842                */
1843               p->w_slot = (slot_t) 0;
1844             }
1845         }
1846     }
1847   if (mode != D_HANGUP)
1848     RestoreLoginSlot();
1849 #endif
1850   if (displays->d_next == 0 && console_window)
1851     {
1852       if (TtyGrabConsole(console_window->w_ptyfd, 0, "detach"))
1853         {
1854           debug("could not release console - killing window\n");
1855           KillWindow(console_window);
1856           display = displays;           /* restore display */
1857         }
1858     }
1859   if (D_fore)
1860     {
1861 #ifdef MULTIUSER
1862       ReleaseAutoWritelock(display, D_fore);
1863 #endif
1864       D_user->u_detachwin = D_fore->w_number;
1865       D_user->u_detachotherwin = D_other ? D_other->w_number : -1;
1866     }
1867   AutosaveLayout(D_layout);
1868   layout_last = D_layout;
1869   for (cv = D_cvlist; cv; cv = cv->c_next)
1870     {
1871       p = Layer2Window(cv->c_layer);
1872       SetCanvasWindow(cv, 0);
1873       if (p)
1874         WindowChanged(p, 'u');
1875     }
1876
1877   pid = D_userpid;
1878   debug2("display: %#x displays: %#x\n", (unsigned int)display, (unsigned int)displays);
1879   FreeDisplay();
1880   if (displays == 0)
1881     /* Flag detached-ness */
1882     (void) chsock();
1883   /*
1884    * tell father what to do. We do that after we
1885    * freed the tty, thus getty feels more comfortable on hpux
1886    * if it was a power detach.
1887    */
1888   Kill(pid, sign);
1889   debug2("Detach: Signal %d to Attacher(%d)!\n", sign, pid);
1890   debug("Detach returns, we are successfully detached.\n");
1891   signal(SIGHUP, SigHup);
1892 }
1893
1894 static int
1895 IsSymbol(e, s)
1896 char *e, *s;
1897 {
1898   register int l;
1899
1900   l = strlen(s);
1901   return strncmp(e, s, l) == 0 && e[l] == '=';
1902 }
1903
1904 void
1905 MakeNewEnv()
1906 {
1907   register char **op, **np;
1908   static char stybuf[MAXSTR];
1909
1910   for (op = environ; *op; ++op)
1911     ;
1912   if (NewEnv)
1913     free((char *)NewEnv);
1914   NewEnv = np = (char **) malloc((unsigned) (op - environ + 7 + 1) * sizeof(char **));
1915   if (!NewEnv)
1916     Panic(0, strnomem);
1917   sprintf(stybuf, "STY=%s", strlen(SockName) <= MAXSTR - 5 ? SockName : "?");
1918   *np++ = stybuf;                       /* NewEnv[0] */
1919   *np++ = Term;                 /* NewEnv[1] */
1920   np++;         /* room for SHELL */
1921 #ifdef TIOCSWINSZ
1922   np += 2;      /* room for TERMCAP and WINDOW */
1923 #else
1924   np += 4;      /* room for TERMCAP WINDOW LINES COLUMNS */
1925 #endif
1926
1927   for (op = environ; *op; ++op)
1928     {
1929       if (!IsSymbol(*op, "TERM") && !IsSymbol(*op, "TERMCAP")
1930           && !IsSymbol(*op, "STY") && !IsSymbol(*op, "WINDOW")
1931           && !IsSymbol(*op, "SCREENCAP") && !IsSymbol(*op, "SHELL")
1932           && !IsSymbol(*op, "LINES") && !IsSymbol(*op, "COLUMNS")
1933          )
1934         *np++ = *op;
1935     }
1936   *np = 0;
1937 }
1938
1939 void
1940 /*VARARGS2*/
1941 #if defined(USEVARARGS) && defined(__STDC__)
1942 Msg(int err, char *fmt, VA_DOTS)
1943 #else
1944 Msg(err, fmt, VA_DOTS)
1945 int err;
1946 char *fmt;
1947 VA_DECL
1948 #endif
1949 {
1950   VA_LIST(ap)
1951   char buf[MAXPATHLEN*2];
1952   char *p = buf;
1953
1954   VA_START(ap, fmt);
1955   fmt = DoNLS(fmt);
1956   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
1957   VA_END(ap);
1958   if (err)
1959     {
1960       p += strlen(p);
1961       *p++ = ':';
1962       *p++ = ' ';
1963       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
1964       buf[sizeof(buf) - 1] = 0;
1965     }
1966   debug2("Msg('%s') (%#x);\n", buf, (unsigned int)display);
1967
1968   if (display && displays)
1969     MakeStatus(buf);
1970   else if (displays)
1971     {
1972       for (display = displays; display; display = display->d_next)
1973         MakeStatus(buf);
1974     }
1975   else if (display)
1976     {
1977       /* no displays but a display - must have forked.
1978        * send message to backend!
1979        */
1980       char *tty = D_usertty;
1981       struct display *olddisplay = display;
1982       display = 0;      /* only send once */
1983       SendErrorMsg(tty, buf);
1984       display = olddisplay;
1985     }
1986   else
1987     printf("%s\r\n", buf);
1988 }
1989
1990 /*
1991  * Call FinitTerm for all displays, write a message to each and call eexit();
1992  */
1993 void
1994 /*VARARGS2*/
1995 #if defined(USEVARARGS) && defined(__STDC__)
1996 Panic(int err, char *fmt, VA_DOTS)
1997 #else
1998 Panic(err, fmt, VA_DOTS)
1999 int err;
2000 char *fmt;
2001 VA_DECL
2002 #endif
2003 {
2004   VA_LIST(ap)
2005   char buf[MAXPATHLEN*2];
2006   char *p = buf;
2007
2008   VA_START(ap, fmt);
2009   fmt = DoNLS(fmt);
2010   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
2011   VA_END(ap);
2012   if (err)
2013     {
2014       p += strlen(p);
2015       *p++ = ':';
2016       *p++ = ' ';
2017       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
2018       buf[sizeof(buf) - 1] = 0;
2019     }
2020   debug3("Panic('%s'); display=%x displays=%x\n", buf, display, displays);
2021   if (displays == 0 && display == 0)
2022     {
2023       printf("%s\r\n", buf);
2024       if (PanicPid)
2025         Kill(PanicPid, SIG_BYE);
2026     }
2027   else if (displays == 0)
2028     {
2029       /* no displays but a display - must have forked.
2030        * send message to backend!
2031        */
2032       char *tty = D_usertty;
2033       display = 0;
2034       SendErrorMsg(tty, buf);
2035       sleep(2);
2036       _exit(1);
2037     }
2038   else
2039     for (display = displays; display; display = display->d_next)
2040       {
2041         if (D_status)
2042           RemoveStatus();
2043         FinitTerm();
2044         Flush();
2045 #ifdef UTMPOK
2046         RestoreLoginSlot();
2047 #endif
2048         SetTTY(D_userfd, &D_OldMode);
2049         fcntl(D_userfd, F_SETFL, 0);
2050         write(D_userfd, buf, strlen(buf));
2051         write(D_userfd, "\n", 1);
2052         freetty();
2053         if (D_userpid)
2054           Kill(D_userpid, SIG_BYE);
2055       }
2056 #ifdef MULTIUSER
2057   if (tty_oldmode >= 0)
2058     {
2059 # ifdef USE_SETEUID
2060       if (setuid(own_uid))
2061         xseteuid(own_uid);      /* may be a loop. sigh. */
2062 # else
2063       setuid(own_uid);
2064 # endif
2065       debug1("Panic: changing back modes from %s\n", attach_tty);
2066       chmod(attach_tty, tty_oldmode);
2067     }
2068 #endif
2069   eexit(1);
2070 }
2071
2072
2073 /*
2074  * '^' is allowed as an escape mechanism for control characters. jw.
2075  *
2076  * Added time insertion using ideas/code from /\ndy Jones
2077  *   (andy@lingua.cltr.uq.OZ.AU) - thanks a lot!
2078  *
2079  */
2080
2081 #ifndef USE_LOCALE
2082 static const char days[]   = "SunMonTueWedThuFriSat";
2083 static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
2084 #endif
2085
2086 static char winmsg_buf[MAXSTR];
2087 #define MAX_WINMSG_REND 16      /* rendition changes */
2088 static int winmsg_rend[MAX_WINMSG_REND];
2089 static int winmsg_rendpos[MAX_WINMSG_REND];
2090 static int winmsg_numrend;
2091
2092 static char *
2093 pad_expand(buf, p, numpad, padlen)
2094 char *buf;
2095 char *p;
2096 int numpad;
2097 int padlen;
2098 {
2099   char *pn, *pn2;
2100   int i, r;
2101
2102   padlen = padlen - (p - buf);  /* space for rent */
2103   if (padlen < 0)
2104     padlen = 0;
2105   pn2 = pn = p + padlen;
2106   r = winmsg_numrend;
2107   while (p >= buf)
2108     {
2109       if (r && p - buf == winmsg_rendpos[r - 1])
2110         {
2111           winmsg_rendpos[--r] = pn - buf;
2112           continue;
2113         }
2114       *pn-- = *p;
2115       if (*p-- == 127)
2116         {
2117           pn[1] = ' ';
2118           i = numpad > 0 ? (padlen + numpad - 1) / numpad : 0;
2119           padlen -= i;
2120           while (i-- > 0)
2121             *pn-- = ' ';
2122           numpad--;
2123         }
2124     }
2125   return pn2;
2126 }
2127
2128 struct backtick {
2129   struct backtick *next;
2130   int num;
2131   int tick;
2132   int lifespan;
2133   time_t bestbefore;
2134   char result[MAXSTR];
2135   char **cmdv;
2136   struct event ev;
2137   char *buf;
2138   int bufi;
2139 };
2140
2141 struct backtick *backticks;
2142
2143 static void
2144 backtick_filter(bt)
2145 struct backtick *bt;
2146 {
2147   char *p, *q;
2148   int c;
2149
2150   for (p = q = bt->result; (c = (unsigned char)*p++) != 0;)
2151     {
2152       if (c == '\t')
2153         c = ' ';
2154       if (c >= ' ' || c == '\005')
2155         *q++ = c;
2156     }
2157   *q = 0;
2158 }
2159
2160 static void
2161 backtick_fn(ev, data)
2162 struct event *ev;
2163 char *data;
2164 {
2165   struct backtick *bt;
2166   int i, j, k, l;
2167
2168   bt = (struct backtick *)data;
2169   debug1("backtick_fn for #%d\n", bt->num);
2170   i = bt->bufi;
2171   l = read(ev->fd, bt->buf + i, MAXSTR - i);
2172   if (l <= 0)
2173     {
2174       debug1("EOF on backtick #%d\n", bt->num);
2175       evdeq(ev);
2176       close(ev->fd);
2177       ev->fd = -1;
2178       return;
2179     }
2180   debug1("read %d bytes\n", l);
2181   i += l;
2182   for (j = 0; j < l; j++)
2183     if (bt->buf[i - j - 1] == '\n')
2184       break;
2185   if (j < l)
2186     {
2187       for (k = i - j - 2; k >= 0; k--)
2188         if (bt->buf[k] == '\n')
2189           break;
2190       k++;
2191       bcopy(bt->buf + k, bt->result, i - j - k);
2192       bt->result[i - j - k - 1] = 0;
2193       backtick_filter(bt);
2194       WindowChanged(0, '`');
2195     }
2196   if (j == l && i == MAXSTR)
2197     {
2198       j = MAXSTR/2;
2199       l = j + 1;
2200     }
2201   if (j < l)
2202     {
2203       if (j)
2204         bcopy(bt->buf + i - j, bt->buf, j);
2205       i = j;
2206     }
2207   bt->bufi = i;
2208 }
2209
2210 void
2211 setbacktick(num, lifespan, tick, cmdv)
2212 int num;
2213 int lifespan;
2214 int tick;
2215 char **cmdv;
2216 {
2217   struct backtick **btp, *bt;
2218   char **v;
2219
2220   debug1("setbacktick called for backtick #%d\n", num);
2221   for (btp = &backticks; (bt = *btp) != 0; btp = &bt->next)
2222     if (bt->num == num)
2223       break;
2224   if (!bt && !cmdv)
2225     return;
2226   if (bt)
2227     {
2228       for (v = bt->cmdv; *v; v++)
2229         free(*v);
2230       free(bt->cmdv);
2231       if (bt->buf)
2232         free(bt->buf);
2233       if (bt->ev.fd >= 0)
2234         close(bt->ev.fd);
2235       evdeq(&bt->ev);
2236     }
2237   if (bt && !cmdv)
2238     {
2239       *btp = bt->next;
2240       free(bt);
2241       return;
2242     }
2243   if (!bt)
2244     {
2245       bt = (struct backtick *)malloc(sizeof *bt);
2246       if (!bt)
2247         {
2248           Msg(0, strnomem);
2249           return;
2250         }
2251       bzero(bt, sizeof(*bt));
2252       bt->next = 0;
2253       *btp = bt;
2254     }
2255   bt->num = num;
2256   bt->tick = tick;
2257   bt->lifespan = lifespan;
2258   bt->bestbefore = 0;
2259   bt->result[0] = 0;
2260   bt->buf = 0;
2261   bt->bufi = 0;
2262   bt->cmdv = cmdv;
2263   bt->ev.fd = -1;
2264   if (bt->tick == 0 && bt->lifespan == 0)
2265     {
2266       debug("setbacktick: continuous mode\n");
2267       bt->buf = (char *)malloc(MAXSTR);
2268       if (bt->buf == 0)
2269         {
2270           Msg(0, strnomem);
2271           setbacktick(num, 0, 0, (char **)0);
2272           return;
2273         }
2274       bt->ev.type = EV_READ;
2275       bt->ev.fd = readpipe(bt->cmdv);
2276       bt->ev.handler = backtick_fn;
2277       bt->ev.data = (char *)bt;
2278       if (bt->ev.fd >= 0)
2279         evenq(&bt->ev);
2280     }
2281 }
2282
2283 static char *
2284 runbacktick(bt, tickp, now)
2285 struct backtick *bt;
2286 int *tickp;
2287 time_t now;
2288 {
2289   int f, i, l, j;
2290   time_t now2;
2291
2292   debug1("runbacktick called for backtick #%d\n", bt->num);
2293   if (bt->tick && (!*tickp || bt->tick < *tickp))
2294     *tickp = bt->tick;
2295   if ((bt->lifespan == 0 && bt->tick == 0) || now < bt->bestbefore)
2296     {
2297       debug1("returning old result (%d)\n", bt->lifespan);
2298       return bt->result;
2299     }
2300   f = readpipe(bt->cmdv);
2301   if (f == -1)
2302     return bt->result;
2303   i = 0;
2304   while ((l = read(f, bt->result + i, sizeof(bt->result) - i)) > 0)
2305     {
2306       debug1("runbacktick: read %d bytes\n", l);
2307       i += l;
2308       for (j = 1; j < l; j++)
2309         if (bt->result[i - j - 1] == '\n')
2310           break;
2311       if (j == l && i == sizeof(bt->result))
2312         {
2313           j = sizeof(bt->result) / 2;
2314           l = j + 1;
2315         }
2316       if (j < l)
2317         {
2318           bcopy(bt->result + i - j, bt->result, j);
2319           i = j;
2320         }
2321     }
2322   close(f);
2323   bt->result[sizeof(bt->result) - 1] = '\n';
2324   if (i && bt->result[i - 1] == '\n')
2325     i--;
2326   debug1("runbacktick: finished, %d bytes\n", i);
2327   bt->result[i] = 0;
2328   backtick_filter(bt);
2329   (void)time(&now2);
2330   bt->bestbefore = now2 + bt->lifespan;
2331   return bt->result;
2332 }
2333
2334 char *
2335 MakeWinMsgEv(str, win, esc, padlen, ev, rec)
2336 char *str;
2337 struct win *win;
2338 int esc;
2339 int padlen;
2340 struct event *ev;
2341 int rec;
2342 {
2343   static int tick;
2344   char *s = str;
2345   register char *p = winmsg_buf;
2346   register int ctrl;
2347   struct timeval now;
2348   struct tm *tm;
2349   int l, i, r;
2350   int num;
2351   int zeroflg;
2352   int longflg;
2353   int minusflg;
2354   int plusflg;
2355   int qmflag = 0, omflag = 0, qmnumrend = 0;
2356   char *qmpos = 0;
2357   int numpad = 0;
2358   int lastpad = 0;
2359   int truncpos = -1;
2360   int truncper = 0;
2361   int trunclong = 0;
2362   struct backtick *bt;
2363
2364   if (winmsg_numrend >= 0)
2365     winmsg_numrend = 0;
2366   else
2367     winmsg_numrend = -winmsg_numrend;
2368
2369   tick = 0;
2370   tm = 0;
2371   ctrl = 0;
2372   gettimeofday(&now, NULL);
2373   for (; *s && (l = winmsg_buf + MAXSTR - 1 - p) > 0; s++, p++)
2374     {
2375       *p = *s;
2376       if (ctrl)
2377         {
2378           ctrl = 0;
2379           if (*s != '^' && *s >= 64)
2380             *p &= 0x1f;
2381           continue;
2382         }
2383       if (*s != esc)
2384         {
2385           if (esc == '%')
2386             {
2387               switch (*s)
2388                 {
2389 #if 0
2390                 case '~':
2391                   *p = BELL;
2392                   break;
2393 #endif
2394                 case '^':
2395                   ctrl = 1;
2396                   *p-- = '^';
2397                   break;
2398                 default:
2399                   break;
2400                 }
2401             }
2402           continue;
2403         }
2404       if (*++s == esc)  /* double escape ? */
2405         continue;
2406       if ((plusflg = *s == '+') != 0)
2407         s++;
2408       if ((minusflg = *s == '-') != 0)
2409         s++;
2410       if ((zeroflg = *s == '0') != 0)
2411         s++;
2412       num = 0;
2413       while(*s >= '0' && *s <= '9')
2414         num = num * 10 + (*s++ - '0');
2415       if ((longflg = *s == 'L') != 0)
2416         s++;
2417       switch (*s)
2418         {
2419         case '?':
2420           p--;
2421           if (qmpos)
2422             {
2423               if ((!qmflag && !omflag) || omflag == 1)
2424                 {
2425                   p = qmpos;
2426                   if (qmnumrend < winmsg_numrend)
2427                     winmsg_numrend = qmnumrend;
2428                 }
2429               qmpos = 0;
2430               break;
2431             }
2432           qmpos = p;
2433           qmnumrend = winmsg_numrend;
2434           qmflag = omflag = 0;
2435           break;
2436         case ':':
2437           p--;
2438           if (!qmpos)
2439             break;
2440           if (qmflag && omflag != 1)
2441             {
2442               omflag = 1;
2443               qmpos = p;
2444               qmnumrend = winmsg_numrend;
2445             }
2446           else
2447             {
2448               p = qmpos;
2449               if (qmnumrend < winmsg_numrend)
2450                 winmsg_numrend = qmnumrend;
2451               omflag = -1;
2452             }
2453           break;
2454         case 'd': case 'D': case 'm': case 'M': case 'y': case 'Y':
2455         case 'a': case 'A': case 's': case 'c': case 'C':
2456           if (l < 4)
2457             break;
2458           if (tm == 0)
2459             {
2460               time_t nowsec = now.tv_sec;
2461               tm = localtime(&nowsec);
2462             }
2463           qmflag = 1;
2464           if (!tick || tick > 3600)
2465             tick = 3600;
2466           switch (*s)
2467             {
2468             case 'd':
2469               sprintf(p, "%02d", tm->tm_mday % 100);
2470               break;
2471             case 'D':
2472 #ifdef USE_LOCALE
2473               strftime(p, l, (longflg ? "%A" : "%a"), tm);
2474 #else
2475               sprintf(p, "%3.3s", days + 3 * tm->tm_wday);
2476 #endif
2477               break;
2478             case 'm':
2479               sprintf(p, "%02d", tm->tm_mon + 1);
2480               break;
2481             case 'M':
2482 #ifdef USE_LOCALE
2483               strftime(p, l, (longflg ? "%B" : "%b"), tm);
2484 #else
2485               sprintf(p, "%3.3s", months + 3 * tm->tm_mon);
2486 #endif
2487               break;
2488             case 'y':
2489               sprintf(p, "%02d", tm->tm_year % 100);
2490               break;
2491             case 'Y':
2492               sprintf(p, "%04d", tm->tm_year + 1900);
2493               break;
2494             case 'a':
2495               sprintf(p, tm->tm_hour >= 12 ? "pm" : "am");
2496               break;
2497             case 'A':
2498               sprintf(p, tm->tm_hour >= 12 ? "PM" : "AM");
2499               break;
2500             case 's':
2501               sprintf(p, "%02d", tm->tm_sec);
2502               tick = 1;
2503               break;
2504             case 'c':
2505               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", tm->tm_hour, tm->tm_min);
2506               if (!tick || tick > 60)
2507                 tick = 60;
2508               break;
2509             case 'C':
2510               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", (tm->tm_hour + 11) % 12 + 1, tm->tm_min);
2511               if (!tick || tick > 60)
2512                 tick = 60;
2513               break;
2514             default:
2515               break;
2516             }
2517           p += strlen(p) - 1;
2518           break;
2519         case 'l':
2520 #ifdef LOADAV
2521           *p = 0;
2522           if (l > 20)
2523             AddLoadav(p);
2524           if (*p)
2525             {
2526               qmflag = 1;
2527               p += strlen(p) - 1;
2528             }
2529           else
2530             *p = '?';
2531           if (!tick || tick > 60)
2532             tick = 60;
2533 #else
2534           *p = '?';
2535 #endif
2536           p += strlen(p) - 1;
2537           break;
2538         case '`':
2539         case 'h':
2540           if (rec >= 10 || (*s == 'h' && (win == 0 || win->w_hstatus == 0 || *win->w_hstatus == 0)))
2541             {
2542               p--;
2543               break;
2544             }
2545           if (*s == '`')
2546             {
2547               for (bt = backticks; bt; bt = bt->next)
2548                 if (bt->num == num)
2549                   break;
2550               if (bt == 0)
2551                 {
2552                   p--;
2553                   break;
2554                 }
2555             }
2556             {
2557               char savebuf[sizeof(winmsg_buf)];
2558               int oldtick = tick;
2559               int oldnumrend = winmsg_numrend;
2560
2561               *p = 0;
2562               strcpy(savebuf, winmsg_buf);
2563               winmsg_numrend = -winmsg_numrend;
2564               MakeWinMsgEv(*s == 'h' ? win->w_hstatus : runbacktick(bt, &oldtick, now.tv_sec), win, '\005', 0, (struct event *)0, rec + 1);
2565               debug2("oldtick=%d tick=%d\n", oldtick, tick);
2566               if (!tick || oldtick < tick)
2567                 tick = oldtick;
2568               if ((int)strlen(winmsg_buf) < l)
2569                 strcat(savebuf, winmsg_buf);
2570               strcpy(winmsg_buf, savebuf);
2571               while (oldnumrend < winmsg_numrend)
2572                 winmsg_rendpos[oldnumrend++] += p - winmsg_buf;
2573               if (*p)
2574                 qmflag = 1;
2575               p += strlen(p) - 1;
2576             }
2577           break;
2578         case 'w':
2579         case 'W':
2580           {
2581             struct win *oldfore = 0;
2582             char *ss;
2583
2584             if (display)
2585               {
2586                 oldfore = D_fore;
2587                 D_fore = win;
2588               }
2589             ss = AddWindows(p, l - 1, (*s == 'w' ? 0 : 1) | (longflg ? 0 : 2) | (plusflg ? 4 : 0), win ? win->w_number : -1);
2590             if (minusflg)
2591                *ss = 0;
2592             if (display)
2593               D_fore = oldfore;
2594           }
2595           if (*p)
2596             qmflag = 1;
2597           p += strlen(p) - 1;
2598           break;
2599         case 'u':
2600           *p = 0;
2601           if (win)
2602             AddOtherUsers(p, l - 1, win);
2603           if (*p)
2604             qmflag = 1;
2605           p += strlen(p) - 1;
2606           break;
2607         case 'f':
2608           *p = 0;
2609           if (win)
2610             AddWindowFlags(p, l - 1, win);
2611           if (*p)
2612             qmflag = 1;
2613           p += strlen(p) - 1;
2614           break;
2615         case 't':
2616           *p = 0;
2617           if (win && (int)strlen(win->w_title) < l)
2618             {
2619               strcpy(p, win->w_title);
2620               if (*p)
2621                 qmflag = 1;
2622             }
2623           p += strlen(p) - 1;
2624           break;
2625         case '{':
2626           {
2627             char rbuf[128];
2628             s++;
2629             for (i = 0; i < 127; i++)
2630               if (s[i] && s[i] != '}')
2631                 rbuf[i] = s[i];
2632               else
2633                 break;
2634             if (s[i] == '}' && winmsg_numrend < MAX_WINMSG_REND)
2635               {
2636                 r = -1;
2637                 rbuf[i] = 0;
2638                 debug1("MakeWinMsg attrcolor %s\n", rbuf);
2639                 if (i != 1 || rbuf[0] != '-')
2640                   r = ParseAttrColor(rbuf, (char *)0, 0);
2641                 if (r != -1 || (i == 1 && rbuf[0] == '-'))
2642                   {
2643                     winmsg_rend[winmsg_numrend] = r;
2644                     winmsg_rendpos[winmsg_numrend] = p - winmsg_buf;
2645                     winmsg_numrend++;
2646                   }
2647               }
2648             s += i;
2649             p--;
2650           }
2651           break;
2652         case 'H':
2653           *p = 0;
2654           if ((int)strlen(HostName) < l)
2655             {
2656               strcpy(p, HostName);
2657               if (*p)
2658                 qmflag = 1;
2659             }
2660           p += strlen(p) - 1;
2661           break;
2662         case 'F':
2663           p--;
2664           /* small hack */
2665           if (display && ((ev && ev == &D_forecv->c_captev) || (!ev && win && win == D_fore)))
2666             minusflg = !minusflg;
2667           if (minusflg)
2668             qmflag = 1;
2669           break;
2670         case '>':
2671           truncpos = p - winmsg_buf;
2672           truncper = num > 100 ? 100 : num;
2673           trunclong = longflg;
2674           p--;
2675           break;
2676         case '=':
2677         case '<':
2678           *p = ' ';
2679           if (num || zeroflg || plusflg || longflg || (*s != '='))
2680             {
2681               /* expand all pads */
2682               if (minusflg)
2683                 {
2684                   num = (plusflg ? lastpad : padlen) - num;
2685                   if (!plusflg && padlen == 0)
2686                     num = p - winmsg_buf;
2687                   plusflg = 0;
2688                 }
2689               else if (!zeroflg)
2690                 {
2691                   if (*s != '=' && num == 0 && !plusflg)
2692                     num = 100;
2693                   if (num > 100)
2694                     num = 100;
2695                   if (padlen == 0)
2696                     num = p - winmsg_buf;
2697                   else
2698                     num = (padlen - (plusflg ? lastpad : 0)) * num / 100;
2699                 }
2700               if (num < 0)
2701                 num = 0;
2702               if (plusflg)
2703                 num += lastpad;
2704               if (num > MAXSTR - 1)
2705                 num = MAXSTR - 1;
2706               if (numpad)
2707                 p = pad_expand(winmsg_buf, p, numpad, num);
2708               numpad = 0;
2709               if (p - winmsg_buf > num && !longflg)
2710                 {
2711                   int left, trunc;
2712
2713                   if (truncpos == -1)
2714                     {
2715                       truncpos = lastpad;
2716                       truncper = 0;
2717                     }
2718                   trunc = lastpad + truncper * (num - lastpad) / 100;
2719                   if (trunc > num)
2720                     trunc = num;
2721                   if (trunc < lastpad)
2722                     trunc = lastpad;
2723                   left = truncpos - trunc;
2724                   if (left > p - winmsg_buf - num)
2725                     left = p - winmsg_buf - num;
2726                   debug1("lastpad = %d, ", lastpad);
2727                   debug3("truncpos = %d, trunc = %d, left = %d\n", truncpos, trunc, left);
2728                   if (left > 0)
2729                     {
2730                       if (left + lastpad > p - winmsg_buf)
2731                         left = p - winmsg_buf - lastpad;
2732                       if (p - winmsg_buf - lastpad - left > 0)
2733                         bcopy(winmsg_buf + lastpad + left, winmsg_buf + lastpad,  p - winmsg_buf - lastpad - left);
2734                       p -= left;
2735                       r = winmsg_numrend;
2736                       while (r && winmsg_rendpos[r - 1] > lastpad)
2737                         {
2738                           r--;
2739                           winmsg_rendpos[r] -= left;
2740                           if (winmsg_rendpos[r] < lastpad)
2741                             winmsg_rendpos[r] = lastpad;
2742                         }
2743                       if (trunclong)
2744                         {
2745                           if (p - winmsg_buf > lastpad)
2746                             winmsg_buf[lastpad] = '.';
2747                           if (p - winmsg_buf > lastpad + 1)
2748                             winmsg_buf[lastpad + 1] = '.';
2749                           if (p - winmsg_buf > lastpad + 2)
2750                             winmsg_buf[lastpad + 2] = '.';
2751                         }
2752                     }
2753                   if (p - winmsg_buf > num)
2754                     {
2755                       p = winmsg_buf + num;
2756                       if (trunclong)
2757                         {
2758                           if (num - 1 >= lastpad)
2759                             p[-1] = '.';
2760                           if (num - 2 >= lastpad)
2761                             p[-2] = '.';
2762                           if (num - 3 >= lastpad)
2763                             p[-3] = '.';
2764                         }
2765                       r = winmsg_numrend;
2766                       while (r && winmsg_rendpos[r - 1] > num)
2767                         winmsg_rendpos[--r] = num;
2768                     }
2769                   truncpos = -1;
2770                   trunclong = 0;
2771                   if (lastpad > p - winmsg_buf)
2772                     lastpad = p - winmsg_buf;
2773                   debug1("lastpad now %d\n", lastpad);
2774                 }
2775               if (*s == '=')
2776                 {
2777                   while (p - winmsg_buf < num)
2778                     *p++ = ' ';
2779                   lastpad = p - winmsg_buf;
2780                   truncpos = -1;
2781                   trunclong = 0;
2782                   debug1("lastpad2 now %d\n", lastpad);
2783                 }
2784               p--;
2785             }
2786           else if (padlen)
2787             {
2788               *p = 127;         /* internal pad representation */
2789               numpad++;
2790             }
2791           break;
2792         case 'n':
2793           s++;
2794           /* FALLTHROUGH */
2795         default:
2796           s--;
2797           if (l > 10 + num)
2798             {
2799               if (num == 0)
2800                 num = 1;
2801               if (!win)
2802                 sprintf(p, "%*s", num, num > 1 ? "--" : "-");
2803               else
2804                 sprintf(p, "%*d", num, win->w_number);
2805               qmflag = 1;
2806               p += strlen(p) - 1;
2807             }
2808           break;
2809         }
2810     }
2811   if (qmpos && !qmflag)
2812     p = qmpos + 1;
2813   *p = '\0';
2814   if (numpad)
2815     {
2816       if (padlen > MAXSTR - 1)
2817         padlen = MAXSTR - 1;
2818       p = pad_expand(winmsg_buf, p, numpad, padlen);
2819     }
2820   if (ev)
2821     {
2822       evdeq(ev);                /* just in case */
2823       ev->timeout.tv_sec = 0;
2824       ev->timeout.tv_usec = 0;
2825     }
2826   if (ev && tick)
2827     {
2828       now.tv_usec = 100000;
2829       if (tick == 1)
2830         now.tv_sec++;
2831       else
2832         now.tv_sec += tick - (now.tv_sec % tick);
2833       ev->timeout = now;
2834       debug2("NEW timeout %d %d\n", ev->timeout.tv_sec, tick);
2835     }
2836   return winmsg_buf;
2837 }
2838
2839 char *
2840 MakeWinMsg(s, win, esc)
2841 char *s;
2842 struct win *win;
2843 int esc;
2844 {
2845   return MakeWinMsgEv(s, win, esc, 0, (struct event *)0, 0);
2846 }
2847
2848 void
2849 PutWinMsg(s, start, max)
2850 char *s;
2851 int start, max;
2852 {
2853   int i, p, l, r, n;
2854   struct mchar rend;
2855   struct mchar rendstack[MAX_WINMSG_REND];
2856   int rendstackn = 0;
2857
2858   if (s != winmsg_buf)
2859     {
2860       /* sorry, no fancy coloring available */
2861       debug1("PutWinMsg %s plain\n", s);
2862       l = strlen(s);
2863       if (l > max)
2864         l = max;
2865       l -= start;
2866       s += start;
2867       while (l-- > 0)
2868         PUTCHARLP(*s++);
2869       return;
2870     }
2871   rend = D_rend;
2872   p = 0;
2873   l = strlen(s);
2874   debug2("PutWinMsg %s start attr %x\n", s, rend.attr);
2875   for (i = 0; i < winmsg_numrend && max > 0; i++)
2876     {
2877       if (p > winmsg_rendpos[i] || winmsg_rendpos[i] > l)
2878         break;
2879       if (p < winmsg_rendpos[i])
2880         {
2881           n = winmsg_rendpos[i] - p;
2882           if (n > max)
2883             n = max;
2884           max -= n;
2885           p += n;
2886           while(n-- > 0)
2887             {
2888               if (start-- > 0)
2889                 s++;
2890               else
2891                 PUTCHARLP(*s++);
2892             }
2893         }
2894       r = winmsg_rend[i];
2895       if (r == -1)
2896         {
2897           if (rendstackn > 0)
2898             rend = rendstack[--rendstackn];
2899         }
2900       else
2901         {
2902           rendstack[rendstackn++] = rend;
2903           ApplyAttrColor(r, &rend);
2904         }
2905       SetRendition(&rend);
2906     }
2907   if (p < l)
2908     {
2909       n = l - p;
2910       if (n > max)
2911         n = max;
2912       while(n-- > 0)
2913         {
2914           if (start-- > 0)
2915             s++;
2916           else
2917             PUTCHARLP(*s++);
2918         }
2919     }
2920 }
2921
2922
2923 #ifdef DEBUG
2924 static void
2925 fds1(i, j)
2926 int i, j;
2927 {
2928   while (i < j)
2929     {
2930       debug1("%d ", i);
2931       i++;
2932     }
2933   if ((j = open("/dev/null", 0)) >= 0)
2934     {
2935       fds1(i + 1, j);
2936       close(j);
2937     }
2938   else
2939     {
2940       while (dup(++i) < 0 && errno != EBADF)
2941         debug1("%d ", i);
2942       debug1(" [%d]\n", i);
2943     }
2944 }
2945
2946 static void
2947 fds()
2948 {
2949   debug("fds: ");
2950   fds1(-1, -1);
2951 }
2952 #endif
2953
2954 static void
2955 serv_read_fn(ev, data)
2956 struct event *ev;
2957 char *data;
2958 {
2959   debug("Knock - knock!\n");
2960   ReceiveMsg();
2961 }
2962
2963 static void
2964 serv_select_fn(ev, data)
2965 struct event *ev;
2966 char *data;
2967 {
2968   struct win *p;
2969
2970   debug("serv_select_fn called\n");
2971   /* XXX: messages?? */
2972   if (GotSigChld)
2973     {
2974       SigChldHandler();
2975     }
2976   if (InterruptPlease)
2977     {
2978       debug("Backend received interrupt\n");
2979       /* This approach is rather questionable in a multi-display
2980        * environment */
2981       if (fore && displays)
2982         {
2983 #if defined(TERMIO) || defined(POSIX)
2984           char ibuf = displays->d_OldMode.tio.c_cc[VINTR];
2985 #else
2986           char ibuf = displays->d_OldMode.m_tchars.t_intrc;
2987 #endif
2988 #ifdef PSEUDOS
2989           write(W_UWP(fore) ? fore->w_pwin->p_ptyfd : fore->w_ptyfd,
2990                 &ibuf, 1);
2991           debug1("Backend wrote interrupt to %d", fore->w_number);
2992           debug1("%s\n", W_UWP(fore) ? " (pseudowin)" : "");
2993 #else
2994           write(fore->w_ptyfd, &ibuf, 1);
2995           debug1("Backend wrote interrupt to %d\n", fore->w_number);
2996 #endif
2997         }
2998       InterruptPlease = 0;
2999     }
3000
3001   for (p = windows; p; p = p->w_next)
3002     {
3003       if (p->w_bell == BELL_FOUND || p->w_bell == BELL_VISUAL)
3004         {
3005           struct canvas *cv;
3006           int visual = p->w_bell == BELL_VISUAL || visual_bell;
3007           p->w_bell = BELL_ON;
3008           for (display = displays; display; display = display->d_next)
3009             {
3010               for (cv = D_cvlist; cv; cv = cv->c_next)
3011                 if (cv->c_layer->l_bottom == &p->w_layer)
3012                   break;
3013               if (cv == 0)
3014                 {
3015                   p->w_bell = BELL_DONE;
3016                   Msg(0, "%s", MakeWinMsg(BellString, p, '%'));
3017                 }
3018               else if (visual && !D_VB && (!D_status || !D_status_bell))
3019                 {
3020                   Msg(0, "%s", VisualBellString);
3021                   if (D_status)
3022                     {
3023                       D_status_bell = 1;
3024                       debug1("using vbell timeout %d\n", VBellWait);
3025                       SetTimeout(&D_statusev, VBellWait );
3026                     }
3027                 }
3028             }
3029           /* don't annoy the user with two messages */
3030           if (p->w_monitor == MON_FOUND)
3031             p->w_monitor = MON_DONE;
3032           WindowChanged(p, 'f');
3033         }
3034       if (p->w_monitor == MON_FOUND)
3035         {
3036           struct canvas *cv;
3037           p->w_monitor = MON_ON;
3038           for (display = displays; display; display = display->d_next)
3039             {
3040               for (cv = D_cvlist; cv; cv = cv->c_next)
3041                 if (cv->c_layer->l_bottom == &p->w_layer)
3042                   break;
3043               if (cv)
3044                 continue;       /* user already sees window */
3045 #ifdef MULTIUSER
3046               if (!(ACLBYTE(p->w_mon_notify, D_user->u_id) & ACLBIT(D_user->u_id)))
3047                 continue;       /* user doesn't care */
3048 #endif
3049               Msg(0, "%s", MakeWinMsg(ActivityString, p, '%'));
3050               p->w_monitor = MON_DONE;
3051             }
3052           WindowChanged(p, 'f');
3053         }
3054     }
3055
3056   for (display = displays; display; display = display->d_next)
3057     {
3058       struct canvas *cv;
3059       if (D_status == STATUS_ON_WIN)
3060         continue;
3061       /* XXX: should use display functions! */
3062       for (cv = D_cvlist; cv; cv = cv->c_next)
3063         {
3064           int lx, ly;
3065
3066           /* normalize window, see resize.c */
3067           lx = cv->c_layer->l_x;
3068           ly = cv->c_layer->l_y;
3069           if (lx == cv->c_layer->l_width)
3070             lx--;
3071           if (ly + cv->c_yoff < cv->c_ys)
3072             {
3073               int i, n = cv->c_ys - (ly + cv->c_yoff);
3074               cv->c_yoff = cv->c_ys - ly;
3075               RethinkViewportOffsets(cv);
3076               if (n > cv->c_layer->l_height)
3077                 n = cv->c_layer->l_height;
3078               CV_CALL(cv,
3079                 LScrollV(flayer, -n, 0, flayer->l_height - 1, 0);
3080                 LayRedisplayLine(-1, -1, -1, 1);
3081                 for (i = 0; i < n; i++)
3082                   LayRedisplayLine(i, 0, flayer->l_width - 1, 1);
3083                 if (cv == cv->c_display->d_forecv)
3084                   LaySetCursor();
3085               );
3086             }
3087           else if (ly + cv->c_yoff > cv->c_ye)
3088             {
3089               int i, n = ly + cv->c_yoff - cv->c_ye;
3090               cv->c_yoff = cv->c_ye - ly;
3091               RethinkViewportOffsets(cv);
3092               if (n > cv->c_layer->l_height)
3093                 n = cv->c_layer->l_height;
3094               CV_CALL(cv,
3095                 LScrollV(flayer, n, 0, cv->c_layer->l_height - 1, 0);
3096                 LayRedisplayLine(-1, -1, -1, 1);
3097                 for (i = 0; i < n; i++)
3098                   LayRedisplayLine(i + flayer->l_height - n, 0, flayer->l_width - 1, 1);
3099                 if (cv == cv->c_display->d_forecv)
3100                   LaySetCursor();
3101               );
3102             }
3103           if (lx + cv->c_xoff < cv->c_xs)
3104             {
3105               int i, n = cv->c_xs - (lx + cv->c_xoff);
3106               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3107                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3108               if (cv->c_xoff + n > cv->c_xs)
3109                 n = cv->c_xs - cv->c_xoff;
3110               cv->c_xoff += n;
3111               RethinkViewportOffsets(cv);
3112               if (n > cv->c_layer->l_width)
3113                 n = cv->c_layer->l_width;
3114               CV_CALL(cv,
3115                 LayRedisplayLine(-1, -1, -1, 1);
3116                 for (i = 0; i < flayer->l_height; i++)
3117                   {
3118                     LScrollH(flayer, -n, i, 0, flayer->l_width - 1, 0, 0);
3119                     LayRedisplayLine(i, 0, n - 1, 1);
3120                   }
3121                 if (cv == cv->c_display->d_forecv)
3122                   LaySetCursor();
3123               );
3124             }
3125           else if (lx + cv->c_xoff > cv->c_xe)
3126             {
3127               int i, n = lx + cv->c_xoff - cv->c_xe;
3128               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3129                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3130               if (cv->c_xoff - n + cv->c_layer->l_width - 1 < cv->c_xe)
3131                 n = cv->c_xoff + cv->c_layer->l_width - 1 - cv->c_xe;
3132               cv->c_xoff -= n;
3133               RethinkViewportOffsets(cv);
3134               if (n > cv->c_layer->l_width)
3135                 n = cv->c_layer->l_width;
3136               CV_CALL(cv,
3137                 LayRedisplayLine(-1, -1, -1, 1);
3138                 for (i = 0; i < flayer->l_height; i++)
3139                   {
3140                     LScrollH(flayer, n, i, 0, flayer->l_width - 1, 0, 0);
3141                     LayRedisplayLine(i, flayer->l_width - n, flayer->l_width - 1, 1);
3142                   }
3143                 if (cv == cv->c_display->d_forecv)
3144                   LaySetCursor();
3145               );
3146             }
3147         }
3148     }
3149
3150   for (display = displays; display; display = display->d_next)
3151     {
3152       if (D_status == STATUS_ON_WIN || D_cvlist == 0 || D_cvlist->c_next == 0)
3153         continue;
3154       debug1("serv_select_fn: Restore on cv %#x\n", (int)D_forecv);
3155       CV_CALL(D_forecv, LayRestore();LaySetCursor());
3156     }
3157 }
3158
3159 static void
3160 logflush_fn(ev, data)
3161 struct event *ev;
3162 char *data;
3163 {
3164   struct win *p;
3165   char *buf;
3166   int n;
3167
3168   if (!islogfile(NULL))
3169     return;             /* no more logfiles */
3170   logfflush(NULL);
3171   n = log_flush ? log_flush : (logtstamp_after + 4) / 5;
3172   if (n)
3173     {
3174       SetTimeout(ev, n * 1000);
3175       evenq(ev);        /* re-enqueue ourself */
3176     }
3177   if (!logtstamp_on)
3178     return;
3179   /* write fancy time-stamp */
3180   for (p = windows; p; p = p->w_next)
3181     {
3182       if (!p->w_log)
3183         continue;
3184       p->w_logsilence += n;
3185       if (p->w_logsilence < logtstamp_after)
3186         continue;
3187       if (p->w_logsilence - n >= logtstamp_after)
3188         continue;
3189       buf = MakeWinMsg(logtstamp_string, p, '%');
3190       logfwrite(p->w_log, buf, strlen(buf));
3191     }
3192 }
3193
3194 /*
3195  * Interprets ^?, ^@ and other ^-control-char notation.
3196  * Interprets \ddd octal notation
3197  *
3198  * The result is placed in *cp, p is advanced behind the parsed expression and
3199  * returned.
3200  */
3201 static char *
3202 ParseChar(p, cp)
3203 char *p, *cp;
3204 {
3205   if (*p == 0)
3206     return 0;
3207   if (*p == '^' && p[1])
3208     {
3209       if (*++p == '?')
3210         *cp = '\177';
3211       else if (*p >= '@')
3212         *cp = Ctrl(*p);
3213       else
3214         return 0;
3215       ++p;
3216     }
3217   else if (*p == '\\' && *++p <= '7' && *p >= '0')
3218     {
3219       *cp = 0;
3220       do
3221         *cp = *cp * 8 + *p - '0';
3222       while (*++p <= '7' && *p >= '0');
3223     }
3224   else
3225     *cp = *p++;
3226   return p;
3227 }
3228
3229 static int
3230 ParseEscape(p)
3231 char *p;
3232 {
3233   unsigned char buf[2];
3234
3235   if (*p == 0)
3236     SetEscape((struct acluser *)0, -1, -1);
3237   else
3238     {
3239       if ((p = ParseChar(p, (char *)buf)) == NULL ||
3240           (p = ParseChar(p, (char *)buf+1)) == NULL || *p)
3241         return -1;
3242       SetEscape((struct acluser *)0, buf[0], buf[1]);
3243     }
3244   return 0;
3245 }
3246