src/screen.c

   1 /* Copyright (c) 2008
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  *      Micah Cowan (micah@cowan.name)
   5  *      Sadrul Habib Chowdhury (sadrul@users.sourceforge.net)
   6  * Copyright (c) 1993-2002, 2003, 2005, 2006, 2007
   7  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   8  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   9  * Copyright (c) 1987 Oliver Laumann
  10 #ifdef HAVE_BRAILLE
  11  * Modified by:
  12  *      Authors:  Hadi Bargi Rangin  bargi@dots.physics.orst.edu
  13  *                Bill Barry         barryb@dots.physics.orst.edu
  14  *                Randy Lundquist    randyl@dots.physics.orst.edu
  15  *
  16  * Modifications Copyright (c) 1995 by
  17  * Science Access Project, Oregon State University.
  18 #endif
  19  *
  20  * This program is free software; you can redistribute it and/or modify
  21  * it under the terms of the GNU General Public License as published by
  22  * the Free Software Foundation; either version 3, or (at your option)
  23  * any later version.
  24  *
  25  * This program is distributed in the hope that it will be useful,
  26  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  27  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  28  * GNU General Public License for more details.
  29  *
  30  * You should have received a copy of the GNU General Public License
  31  * along with this program (see the file COPYING); if not, see
  32  * http://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
  33  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  34  *
  35  ****************************************************************
  36  */
  37
  38 #include <sys/types.h>
  39 #include <ctype.h>
  40
  41 #include <fcntl.h>
  42
  43 #ifdef sgi
  44 # include <sys/sysmacros.h>
  45 #endif
  46
  47 #include <sys/stat.h>
  48 #ifndef sun
  49 # include <sys/ioctl.h>
  50 #endif
  51
  52 #ifndef SIGINT
  53 # include <signal.h>
  54 #endif
  55
  56 #include "config.h"
  57
  58 #ifdef HAVE_STROPTS_H
  59 # include <sys/stropts.h>
  60 #endif
  61
  62 #if defined(SYSV) && !defined(ISC)
  63 # include <sys/utsname.h>
  64 #endif
  65
  66 #if defined(sequent) || defined(SVR4)
  67 # include <sys/resource.h>
  68 #endif /* sequent || SVR4 */
  69
  70 #ifdef ISC
  71 # include <sys/tty.h>
  72 # include <sys/sioctl.h>
  73 # include <sys/pty.h>
  74 #endif /* ISC */
  75
  76 #if (defined(AUX) || defined(_AUX_SOURCE)) && defined(POSIX)
  77 # include <compat.h>
  78 #endif
  79 #if defined(USE_LOCALE) || defined(ENCODINGS)
  80 # include <locale.h>
  81 #endif
  82 #if defined(HAVE_NL_LANGINFO) && defined(ENCODINGS)
  83 # include <langinfo.h>
  84 #endif
  85
  86 #include "screen.h"
  87 #ifdef HAVE_BRAILLE
  88 # include "braille.h"
  89 #endif
  90
  91 #include "patchlevel.h"
  92
  93 /*
  94  *  At the moment we only need the real password if the
  95  *  builtin lock is used. Therefore disable SHADOWPW if
  96  *  we do not really need it (kind of security thing).
  97  */
  98 #ifndef LOCK
  99 # undef SHADOWPW
 100 #endif
 101
 102 #include <pwd.h>
 103 #ifdef SHADOWPW
 104 # include <shadow.h>
 105 #endif /* SHADOWPW */
 106
 107 #include "logfile.h"    /* islogfile, logfflush */
 108
 109 #ifdef DEBUG
 110 FILE *dfp;
 111 #endif
 112
 113
 114 extern char Term[], screenterm[], **environ, Termcap[];
 115 int force_vt = 1;
 116 int VBellWait, MsgWait, MsgMinWait, SilenceWait;
 117
 118 extern struct acluser *users;
 119 extern struct display *displays, *display;
 120
 121
 122 extern int visual_bell;
 123 #ifdef COPY_PASTE
 124 extern unsigned char mark_key_tab[];
 125 #endif
 126 extern char version[];
 127 extern char DefaultShell[];
 128 #ifdef ZMODEM
 129 extern char *zmodem_sendcmd;
 130 extern char *zmodem_recvcmd;
 131 #endif
 132 extern struct layout *layout_last;
 133
 134
 135 char *ShellProg;
 136 char *ShellArgs[2];
 137
 138 extern struct NewWindow nwin_undef, nwin_default, nwin_options;
 139 struct backtick;
 140
 141 static struct passwd *getpwbyname __P((char *, struct passwd *));
 142 static void  SigChldHandler __P((void));
 143 static sigret_t SigChld __P(SIGPROTOARG);
 144 static sigret_t SigInt __P(SIGPROTOARG);
 145 static sigret_t CoreDump __P(SIGPROTOARG);
 146 static sigret_t FinitHandler __P(SIGPROTOARG);
 147 static void  DoWait __P((void));
 148 static void  serv_read_fn __P((struct event *, char *));
 149 static void  serv_select_fn __P((struct event *, char *));
 150 static void  logflush_fn __P((struct event *, char *));
 151 static void  backtick_filter __P((struct backtick *));
 152 static void  backtick_fn __P((struct event *, char *));
 153 static char *runbacktick __P((struct backtick *, int *, time_t));
 154 static int   IsSymbol __P((char *, char *));
 155 static char *ParseChar __P((char *, char *));
 156 static int   ParseEscape __P((char *));
 157 static char *pad_expand __P((char *, char *, int, int));
 158 #ifdef DEBUG
 159 static void  fds __P((void));
 160 #endif
 161
 162 int nversion;   /* numerical version, used for secondary DA */
 163
 164 /* the attacher */
 165 struct passwd *ppp;
 166 char *attach_tty;
 167 int attach_fd = -1;
 168 char *attach_term;
 169 char *LoginName;
 170 struct mode attach_Mode;
 171
 172 char SockPath[MAXPATHLEN + 2 * MAXSTR];
 173 char *SockName;                 /* SockName is pointer in SockPath */
 174 char *SockMatch = NULL;         /* session id command line argument */
 175 int ServerSocket = -1;
 176 struct event serv_read;
 177 struct event serv_select;
 178 struct event logflushev;
 179
 180 char **NewEnv = NULL;
 181
 182 char *RcFileName = NULL;
 183 char *home;
 184
 185 char *screenlogfile;                    /* filename layout */
 186 int log_flush = 10;                     /* flush interval in seconds */
 187 int logtstamp_on = 0;                   /* tstamp disabled */
 188 char *logtstamp_string;                 /* stamp layout */
 189 int logtstamp_after = 120;              /* first tstamp after 120s */
 190 char *hardcopydir = NULL;
 191 char *BellString;
 192 char *VisualBellString;
 193 char *ActivityString;
 194 #ifdef COPY_PASTE
 195 char *BufferFile;
 196 #endif
 197 #ifdef POW_DETACH
 198 char *PowDetachString;
 199 #endif
 200 char *hstatusstring;
 201 char *captionstring;
 202 char *timestring;
 203 char *wliststr;
 204 char *wlisttit;
 205 int auto_detach = 1;
 206 int iflag, rflag, dflag, lsflag, quietflag, wipeflag, xflag;
 207 int cmdflag;
 208 int adaptflag;
 209
 210 #ifdef MULTIUSER
 211 char *multi;
 212 char *multi_home;
 213 int multi_uid;
 214 int own_uid;
 215 int multiattach;
 216 int tty_mode;
 217 int tty_oldmode = -1;
 218 #endif
 219
 220 char HostName[MAXSTR];
 221 int MasterPid, PanicPid;
 222 int real_uid, real_gid, eff_uid, eff_gid;
 223 int default_startup;
 224 int ZombieKey_destroy, ZombieKey_resurrect, ZombieKey_onerror;
 225 char *preselect = NULL;         /* only used in Attach() */
 226
 227 #ifdef UTF8
 228 char *screenencodings;
 229 #endif
 230
 231 #ifdef DW_CHARS
 232 int cjkwidth;
 233 #endif
 234
 235 #ifdef NETHACK
 236 int nethackflag = 0;
 237 #endif
 238 int maxwin = MAXWIN;
 239
 240
 241 struct layer *flayer;
 242 struct win *fore;
 243 struct win *windows;
 244 struct win *console_window;
 245
 246
 247
 248 /*
 249  * Do this last
 250  */
 251 #include "extern.h"
 252
 253 char strnomem[] = "Out of memory.";
 254
 255
 256 static int InterruptPlease;
 257 static int GotSigChld;
 258
 259 static int
 260 lf_secreopen(name, wantfd, l)
 261 char *name;
 262 int wantfd;
 263 struct logfile *l;
 264 {
 265   int got_fd;
 266
 267   close(wantfd);
 268   if (((got_fd = secopen(name, O_WRONLY | O_CREAT | O_APPEND, 0666)) < 0) ||
 269       lf_move_fd(got_fd, wantfd) < 0)
 270     {
 271       logfclose(l);
 272       debug1("lf_secreopen: failed for %s\n", name);
 273       return -1;
 274     }
 275   l->st->st_ino = l->st->st_dev = 0;
 276   debug2("lf_secreopen: %d = %s\n", wantfd, name);
 277   return 0;
 278 }
 279
 280 /********************************************************************/
 281 /********************************************************************/
 282 /********************************************************************/
 283
 284
 285 static struct passwd *
 286 getpwbyname(name, ppp)
 287 char *name;
 288 struct passwd *ppp;
 289 {
 290   int n;
 291 #ifdef SHADOWPW
 292   struct spwd *sss = NULL;
 293   static char *spw = NULL;
 294 #endif
 295
 296   if (!ppp && !(ppp = getpwnam(name)))
 297     return NULL;
 298
 299   /* Do password sanity check..., allow ##user for SUN_C2 security */
 300 #ifdef SHADOWPW
 301 pw_try_again:
 302 #endif
 303   n = 0;
 304   if (ppp->pw_passwd[0] == '#' && ppp->pw_passwd[1] == '#' &&
 305       strcmp(ppp->pw_passwd + 2, ppp->pw_name) == 0)
 306     n = 13;
 307   for (; n < 13; n++)
 308     {
 309       char c = ppp->pw_passwd[n];
 310       if (!(c == '.' || c == '/' || c == '$' ||
 311             (c >= '0' && c <= '9') ||
 312             (c >= 'a' && c <= 'z') ||
 313             (c >= 'A' && c <= 'Z')))
 314         break;
 315     }
 316
 317 #ifdef SHADOWPW
 318   /* try to determine real password */
 319   if (n < 13 && sss == 0)
 320     {
 321       sss = getspnam(ppp->pw_name);
 322       if (sss)
 323         {
 324           if (spw)
 325             free(spw);
 326           ppp->pw_passwd = spw = SaveStr(sss->sp_pwdp);
 327           endspent();   /* this should delete all buffers ... */
 328           goto pw_try_again;
 329         }
 330       endspent();       /* this should delete all buffers ... */
 331     }
 332 #endif
 333   if (n < 13)
 334     ppp->pw_passwd = 0;
 335 #ifdef linux
 336   if (ppp->pw_passwd && strlen(ppp->pw_passwd) == 13 + 11)
 337     ppp->pw_passwd[13] = 0;     /* beware of linux's long passwords */
 338 #endif
 339
 340   return ppp;
 341 }
 342
 343 static char *
 344 locale_name(void)
 345 {
 346   static char *s;
 347
 348   if (!s)
 349     {
 350       s = getenv("LC_ALL");
 351       if (s == NULL)
 352         s = getenv("LC_CTYPE");
 353       if (s == NULL)
 354         s = getenv("LANG");
 355     }
 356   return s;
 357 }
 358
 359 int
 360 main(ac, av)
 361 int ac;
 362 char **av;
 363 {
 364   register int n;
 365   char *ap;
 366   char *av0;
 367   char socknamebuf[2 * MAXSTR];
 368   int mflag = 0;
 369   char *myname = (ac == 0) ? "screen" : av[0];
 370   char *SockDir;
 371   struct stat st;
 372 #ifdef _MODE_T                  /* (jw) */
 373   mode_t oumask;
 374 #else
 375   int oumask;
 376 #endif
 377 #if defined(SYSV) && !defined(ISC)
 378   struct utsname utsnam;
 379 #endif
 380   struct NewWindow nwin;
 381   int detached = 0;             /* start up detached */
 382 #ifdef MULTIUSER
 383   char *sockp;
 384 #endif
 385   char *sty = 0;
 386
 387 #if (defined(AUX) || defined(_AUX_SOURCE)) && defined(POSIX)
 388   setcompat(COMPAT_POSIX|COMPAT_BSDPROT); /* turn on seteuid support */
 389 #endif
 390 #if defined(sun) && defined(SVR4)
 391   {
 392     /* Solaris' login blocks SIGHUP! This is _very bad_ */
 393     sigset_t sset;
 394     sigemptyset(&sset);
 395     sigprocmask(SIG_SETMASK, &sset, 0);
 396   }
 397 #endif
 398
 399   /*
 400    *  First, close all unused descriptors
 401    *  (otherwise, we might have problems with the select() call)
 402    */
 403   closeallfiles(0);
 404 #ifdef DEBUG
 405   opendebug(1, 0);
 406 #endif
 407   snprintf(version, 59, "%d.%.2d.%.2d%s (%s%s) %s", REV, VERS,
 408           PATCHLEVEL, STATE, ORIGIN, GIT_REV, DATE);
 409   nversion = REV * 10000 + VERS * 100 + PATCHLEVEL;
 410   debug2("-- screen debug started %s (%s)\n", *av, version);
 411 #ifdef POSIX
 412   debug("POSIX\n");
 413 #endif
 414 #ifdef TERMIO
 415   debug("TERMIO\n");
 416 #endif
 417 #ifdef SYSV
 418   debug("SYSV\n");
 419 #endif
 420 #ifdef SYSVSIGS
 421   debug("SYSVSIGS\n");
 422 #endif
 423 #ifdef NAMEDPIPE
 424   debug("NAMEDPIPE\n");
 425 #endif
 426 #if defined(SIGWINCH) && defined(TIOCGWINSZ)
 427   debug("Window size changing enabled\n");
 428 #endif
 429 #ifdef HAVE_SETREUID
 430   debug("SETREUID\n");
 431 #endif
 432 #ifdef HAVE_SETEUID
 433   debug("SETEUID\n");
 434 #endif
 435 #ifdef hpux
 436   debug("hpux\n");
 437 #endif
 438 #ifdef USEBCOPY
 439   debug("USEBCOPY\n");
 440 #endif
 441 #ifdef UTMPOK
 442   debug("UTMPOK\n");
 443 #endif
 444 #ifdef LOADAV
 445   debug("LOADAV\n");
 446 #endif
 447 #ifdef NETHACK
 448   debug("NETHACK\n");
 449 #endif
 450 #ifdef TERMINFO
 451   debug("TERMINFO\n");
 452 #endif
 453 #ifdef SHADOWPW
 454   debug("SHADOWPW\n");
 455 #endif
 456 #ifdef NAME_MAX
 457   debug1("NAME_MAX = %d\n", NAME_MAX);
 458 #endif
 459
 460   BellString = SaveStr("Bell in window %n");
 461   VisualBellString = SaveStr("   Wuff,  Wuff!!  ");
 462   ActivityString = SaveStr("Activity in window %n");
 463   screenlogfile = SaveStr("screenlog.%n");
 464   logtstamp_string = SaveStr("-- %n:%t -- time-stamp -- %M/%d/%y %c:%s --\n");
 465   hstatusstring = SaveStr("%h");
 466   captionstring = SaveStr("%3n %t");
 467   timestring = SaveStr("%c:%s %M %d %H%? %l%?");
 468   wlisttit = SaveStr("Num Name%=Flags");
 469   wliststr = SaveStr("%3n %t%=%f");
 470 #ifdef COPY_PASTE
 471   BufferFile = SaveStr(DEFAULT_BUFFERFILE);
 472 #endif
 473   ShellProg = NULL;
 474 #ifdef POW_DETACH
 475   PowDetachString = 0;
 476 #endif
 477   default_startup = (ac > 1) ? 0 : 1;
 478   adaptflag = 0;
 479   VBellWait = VBELLWAIT * 1000;
 480   MsgWait = MSGWAIT * 1000;
 481   MsgMinWait = MSGMINWAIT * 1000;
 482   SilenceWait = SILENCEWAIT;
 483 #ifdef HAVE_BRAILLE
 484   InitBraille();
 485 #endif
 486 #ifdef ZMODEM
 487   zmodem_sendcmd = SaveStr("!!! sz -vv -b ");
 488   zmodem_recvcmd = SaveStr("!!! rz -vv -b -E");
 489 #endif
 490
 491 #ifdef COPY_PASTE
 492   CompileKeys((char *)0, 0, mark_key_tab);
 493 #endif
 494 #ifdef UTF8
 495   InitBuiltinTabs();
 496   screenencodings = SaveStr(SCREENENCODINGS);
 497 #endif
 498 #ifdef DW_CHARS
 499   cjkwidth = 0;
 500 #endif
 501   nwin = nwin_undef;
 502   nwin_options = nwin_undef;
 503   strcpy(screenterm, "screen");
 504
 505   logreopen_register(lf_secreopen);
 506
 507   av0 = *av;
 508   /* if this is a login screen, assume -RR */
 509   if (*av0 == '-')
 510     {
 511       rflag = 4;
 512 #ifdef MULTI
 513       xflag = 1;
 514 #else
 515       dflag = 1;
 516 #endif
 517       ShellProg = SaveStr(DefaultShell); /* to prevent nasty circles */
 518     }
 519   while (ac > 0)
 520     {
 521       ap = *++av;
 522       if (--ac > 0 && *ap == '-')
 523         {
 524           if (ap[1] == '-' && ap[2] == 0)
 525             {
 526               av++;
 527               ac--;
 528               break;
 529             }
 530           if (ap[1] == '-' && !strcmp(ap, "--version"))
 531             Panic(0, "Screen version %s", version);
 532           if (ap[1] == '-' && !strcmp(ap, "--help"))
 533             exit_with_usage(myname, NULL, NULL);
 534           while (ap && *ap && *++ap)
 535             {
 536               switch (*ap)
 537                 {
 538                 case 'a':
 539                   nwin_options.aflag = 1;
 540                   break;
 541                 case 'A':
 542                   adaptflag = 1;
 543                   break;
 544                 case 'p': /* preselect */
 545                   if (*++ap)
 546                     preselect = ap;
 547                   else
 548                     {
 549                       if (!--ac)
 550                         exit_with_usage(myname, "Specify a window to preselect with -p", NULL);
 551                       preselect = *++av;
 552                     }
 553                   ap = NULL;
 554                   break;
 555 #ifdef HAVE_BRAILLE
 556                 case 'B':
 557                   bd.bd_start_braille = 1;
 558                   break;
 559 #endif
 560                 case 'c':
 561                   if (*++ap)
 562                     RcFileName = ap;
 563                   else
 564                     {
 565                       if (--ac == 0)
 566                         exit_with_usage(myname, "Specify an alternate rc-filename with -c", NULL);
 567                       RcFileName = *++av;
 568                     }
 569                   ap = NULL;
 570                   break;
 571                 case 'e':
 572                   if (!*++ap)
 573                     {
 574                       if (--ac == 0)
 575                         exit_with_usage(myname, "Specify command characters with -e", NULL);
 576                       ap = *++av;
 577                     }
 578                   if (ParseEscape(ap))
 579                     Panic(0, "Two characters are required with -e option, not '%s'.", ap);
 580                   ap = NULL;
 581                   break;
 582                 case 'f':
 583                   ap++;
 584                   switch (*ap++)
 585                     {
 586                     case 'n':
 587                     case '0':
 588                       nwin_options.flowflag = FLOW_NOW * 0;
 589                       break;
 590                     case '\0':
 591                       ap--;
 592                       /* FALLTHROUGH */
 593                     case 'y':
 594                     case '1':
 595                       nwin_options.flowflag = FLOW_NOW * 1;
 596                       break;
 597                     case 'a':
 598                       nwin_options.flowflag = FLOW_AUTOFLAG;
 599                       break;
 600                     default:
 601                       exit_with_usage(myname, "Unknown flow option -%s", --ap);
 602                     }
 603                   break;
 604                 case 'h':
 605                   if (--ac == 0)
 606                     exit_with_usage(myname, NULL, NULL);
 607                   nwin_options.histheight = atoi(*++av);
 608                   if (nwin_options.histheight < 0)
 609                     exit_with_usage(myname, "-h: %s: negative scrollback size?", *av);
 610                   break;
 611                 case 'i':
 612                   iflag = 1;
 613                   break;
 614                 case 't': /* title, the former AkA == -k */
 615                   if (--ac == 0)
 616                     exit_with_usage(myname, "Specify a new window-name with -t", NULL);
 617                   nwin_options.aka = *++av;
 618                   break;
 619                 case 'l':
 620                   ap++;
 621                   switch (*ap++)
 622                     {
 623                     case 'n':
 624                     case '0':
 625                       nwin_options.lflag = 0;
 626                       break;
 627                     case '\0':
 628                       ap--;
 629                       /* FALLTHROUGH */
 630                     case 'y':
 631                     case '1':
 632                       nwin_options.lflag = 1;
 633                       break;
 634                     case 'a':
 635                       nwin_options.lflag = 3;
 636                       break;
 637                     case 's':   /* -ls */
 638                     case 'i':   /* -list */
 639                       lsflag = 1;
 640                       if (ac > 1 && !SockMatch)
 641                         {
 642                           SockMatch = *++av;
 643                           ac--;
 644                         }
 645                       ap = NULL;
 646                       break;
 647                     default:
 648                       exit_with_usage(myname, "%s: Unknown suboption to -l", --ap);
 649                     }
 650                   break;
 651                 case 'w':
 652                   lsflag = 1;
 653                   wipeflag = 1;
 654                   if (ac > 1 && !SockMatch)
 655                     {
 656                       SockMatch = *++av;
 657                       ac--;
 658                     }
 659                   break;
 660                 case 'L':
 661                   nwin_options.Lflag = 1;
 662                   break;
 663                 case 'm':
 664                   mflag = 1;
 665                   break;
 666                 case 'O':               /* to be (or not to be?) deleted. jw. */
 667                   force_vt = 0;
 668                   break;
 669                 case 'T':
 670                   if (--ac == 0)
 671                     exit_with_usage(myname, "Specify terminal-type with -T", NULL);
 672                   if (strlen(*++av) < 20)
 673                     strcpy(screenterm, *av);
 674                   else
 675                     Panic(0, "-T: terminal name too long. (max. 20 char)");
 676                   nwin_options.term = screenterm;
 677                   break;
 678                 case 'q':
 679                   quietflag = 1;
 680                   break;
 681                 case 'r':
 682                 case 'R':
 683 #ifdef MULTI
 684                 case 'x':
 685 #endif
 686                   if (ac > 1 && *av[1] != '-' && !SockMatch)
 687                     {
 688                       SockMatch = *++av;
 689                       ac--;
 690                       debug2("rflag=%d, SockMatch=%s\n", dflag, SockMatch);
 691                     }
 692 #ifdef MULTI
 693                   if (*ap == 'x')
 694                     xflag = 1;
 695 #endif
 696                   if (rflag)
 697                     rflag = 2;
 698                   rflag += (*ap == 'R') ? 2 : 1;
 699                   break;
 700 #ifdef REMOTE_DETACH
 701                 case 'd':
 702                   dflag = 1;
 703                   /* FALLTHROUGH */
 704                 case 'D':
 705                   if (!dflag)
 706                     dflag = 2;
 707                   if (ac == 2)
 708                     {
 709                       if (*av[1] != '-' && !SockMatch)
 710                         {
 711                           SockMatch = *++av;
 712                           ac--;
 713                           debug2("dflag=%d, SockMatch=%s\n", dflag, SockMatch);
 714                         }
 715                     }
 716                   break;
 717 #endif
 718                 case 's':
 719                   if (--ac == 0)
 720                     exit_with_usage(myname, "Specify shell with -s", NULL);
 721                   if (ShellProg)
 722                     free(ShellProg);
 723                   ShellProg = SaveStr(*++av);
 724                   debug1("ShellProg: '%s'\n", ShellProg);
 725                   break;
 726                 case 'S':
 727                   if (!SockMatch)
 728                     {
 729                       if (--ac == 0)
 730                         exit_with_usage(myname, "Specify session-name with -S", NULL);
 731                       SockMatch = *++av;
 732                     }
 733                   if (!*SockMatch)
 734                     exit_with_usage(myname, "Empty session-name?", NULL);
 735                   break;
 736                 case 'X':
 737                   cmdflag = 1;
 738                   break;
 739                 case 'v':
 740                   Panic(0, "Screen version %s", version);
 741                   /* NOTREACHED */
 742 #ifdef UTF8
 743                 case 'U':
 744                   nwin_options.encoding = nwin_options.encoding == -1 ? UTF8 : 0;
 745                   break;
 746 #endif
 747                 default:
 748                   exit_with_usage(myname, "Unknown option %s", --ap);
 749                 }
 750             }
 751         }
 752       else
 753         break;
 754     }
 755
 756   real_uid = getuid();
 757   real_gid = getgid();
 758   eff_uid = geteuid();
 759   eff_gid = getegid();
 760   if (eff_uid != real_uid)
 761     {
 762       /* if running with s-bit, we must install a special signal
 763        * handler routine that resets the s-bit, so that we get a
 764        * core file anyway.
 765        */
 766 #ifdef SIGBUS /* OOPS, linux has no bus errors! */
 767       signal(SIGBUS, CoreDump);
 768 #endif /* SIGBUS */
 769       signal(SIGSEGV, CoreDump);
 770     }
 771
 772 #ifdef USE_LOCALE
 773   setlocale(LC_ALL, "");
 774 #endif
 775 #ifdef ENCODINGS
 776   if (nwin_options.encoding == -1)
 777     {
 778       /* ask locale if we should start in UTF-8 mode */
 779 # ifdef HAVE_NL_LANGINFO
 780 #  ifndef USE_LOCALE
 781       setlocale(LC_CTYPE, "");
 782 #  endif
 783       nwin_options.encoding = FindEncoding(nl_langinfo(CODESET));
 784       debug1("locale says encoding = %d\n", nwin_options.encoding);
 785 # else
 786 #  ifdef UTF8
 787       char *s;
 788       if ((s = locale_name()) && InStr(s, "UTF-8"))
 789         nwin_options.encoding = UTF8;
 790 #  endif
 791       debug1("environment says encoding=%d\n", nwin_options.encoding);
 792 #endif
 793     }
 794 # ifdef DW_CHARS
 795   {
 796     char *s;
 797     if ((s = locale_name()))
 798     {
 799       if(!strncmp(s, "zh_", 3) || !strncmp(s, "ja_", 3) || !strncmp(s, "ko_", 3))
 800       {
 801         cjkwidth = 1;
 802       }
 803     }
 804   }
 805 #endif
 806 #endif
 807   if (nwin_options.aka)
 808     {
 809 #ifdef ENCODINGS
 810       if (nwin_options.encoding > 0)
 811         {
 812           size_t len = strlen(nwin_options.aka);
 813           size_t newsz;
 814           char *newbuf = malloc(3 * len);
 815           if (!newbuf)
 816             Panic(0, strnomem);
 817           newsz = RecodeBuf(nwin_options.aka, len,
 818                             nwin_options.encoding, 0, newbuf);
 819           newbuf[newsz] = '\0';
 820           nwin_options.aka = newbuf;
 821         }
 822       else
 823 #endif
 824         {
 825           /* If we just use the original value from av,
 826              subsequent shelltitle invocations will attempt to free
 827              space we don't own... */
 828           nwin_options.aka = SaveStr(nwin_options.aka);
 829         }
 830     }
 831
 832   if (SockMatch && strlen(SockMatch) >= MAXSTR)
 833     Panic(0, "Ridiculously long socketname - try again.");
 834   if (cmdflag && !rflag && !dflag && !xflag)
 835     xflag = 1;
 836   if (!cmdflag && dflag && mflag && !(rflag || xflag))
 837     detached = 1;
 838   nwin = nwin_options;
 839 #ifdef ENCODINGS
 840   nwin.encoding = nwin_undef.encoding;  /* let screenrc overwrite it */
 841 #endif
 842   if (ac)
 843     nwin.args = av;
 844
 845   /* make the write() calls return -1 on all errors */
 846 #ifdef SIGXFSZ
 847   /*
 848    * Ronald F. Guilmette, Oct 29 '94, bug-gnu-utils@prep.ai.mit.edu:
 849    * It appears that in System V Release 4, UNIX, if you are writing
 850    * an output file and you exceed the currently set file size limit,
 851    * you _don't_ just get the call to `write' returning with a
 852    * failure code.  Rather, you get a signal called `SIGXFSZ' which,
 853    * if neither handled nor ignored, will cause your program to crash
 854    * with a core dump.
 855    */
 856   signal(SIGXFSZ, SIG_IGN);
 857 #endif /* SIGXFSZ */
 858
 859 #ifdef SIGPIPE
 860   signal(SIGPIPE, SIG_IGN);
 861 #endif
 862
 863   if (!ShellProg)
 864     {
 865       register char *sh;
 866
 867       sh = getenv("SHELL");
 868       ShellProg = SaveStr(sh ? sh : DefaultShell);
 869     }
 870   ShellArgs[0] = ShellProg;
 871   home = getenv("HOME");
 872   if (!mflag && !SockMatch)
 873     {
 874       sty = getenv("STY");
 875       if (sty && *sty == 0)
 876         sty = 0;
 877     }
 878
 879 #ifdef NETHACK
 880   if (!(nethackflag = (getenv("NETHACKOPTIONS") != NULL)))
 881     {
 882       char nethackrc[MAXPATHLEN];
 883
 884       if (home && (strlen(home) < (MAXPATHLEN - 20)))
 885         {
 886           sprintf(nethackrc,"%s/.nethackrc", home);
 887           nethackflag = !access(nethackrc, F_OK);
 888         }
 889     }
 890 #endif
 891
 892 #ifdef MULTIUSER
 893   own_uid = multi_uid = real_uid;
 894   if (SockMatch && (sockp = index(SockMatch, '/')))
 895     {
 896       *sockp = 0;
 897       multi = SockMatch;
 898       SockMatch = sockp + 1;
 899       if (*multi)
 900         {
 901           struct passwd *mppp;
 902           if ((mppp = getpwnam(multi)) == (struct passwd *)0)
 903             Panic(0, "Cannot identify account '%s'.", multi);
 904           multi_uid = mppp->pw_uid;
 905           multi_home = SaveStr(mppp->pw_dir);
 906           if (strlen(multi_home) > MAXPATHLEN - 10)
 907             Panic(0, "home directory path too long");
 908 # ifdef MULTI
 909           /* always fake multi attach mode */
 910           if (rflag || lsflag)
 911             xflag = 1;
 912 # endif /* MULTI */
 913           detached = 0;
 914           multiattach = 1;
 915         }
 916       /* Special case: effective user is multiuser. */
 917       if (eff_uid && (multi_uid != eff_uid))
 918         Panic(0, "Must run suid root for multiuser support.");
 919     }
 920   if (SockMatch && *SockMatch == 0)
 921     SockMatch = 0;
 922 #endif /* MULTIUSER */
 923
 924   if ((LoginName = getlogin()) && LoginName[0] != '\0')
 925     {
 926       if ((ppp = getpwnam(LoginName)) != (struct passwd *) 0)
 927         if ((int)ppp->pw_uid != real_uid)
 928           ppp = (struct passwd *) 0;
 929     }
 930   if (ppp == 0)
 931     {
 932       if ((ppp = getpwuid(real_uid)) == 0)
 933         {
 934           Panic(0, "getpwuid() can't identify your account!");
 935           exit(1);
 936         }
 937       LoginName = ppp->pw_name;
 938     }
 939   LoginName = SaveStr(LoginName);
 940
 941   ppp = getpwbyname(LoginName, ppp);
 942
 943 #if !defined(SOCKDIR) && defined(MULTIUSER)
 944   if (multi && !multiattach)
 945     {
 946       if (home && strcmp(home, ppp->pw_dir))
 947         Panic(0, "$HOME must match passwd entry for multiuser screens.");
 948     }
 949 #endif
 950
 951 #define SET_GUID() do \
 952   { \
 953     setgid(real_gid); \
 954     setuid(real_uid); \
 955     eff_uid = real_uid; \
 956     eff_gid = real_gid; \
 957   } while (0)
 958
 959 #define SET_TTYNAME(fatal) do \
 960   { \
 961     if (!(attach_tty = ttyname(0))) \
 962       { \
 963         if (fatal) \
 964           Panic(0, "Must be connected to a terminal."); \
 965         else \
 966           attach_tty = ""; \
 967       } \
 968     else if (stat(attach_tty, &st)) \
 969       Panic(errno, "Cannot access '%s'", attach_tty); \
 970     if (strlen(attach_tty) >= MAXPATHLEN) \
 971       Panic(0, "TtyName too long - sorry."); \
 972   } while (0)
 973
 974   if (home == 0 || *home == '\0')
 975     home = ppp->pw_dir;
 976   if (strlen(LoginName) > 20)
 977     Panic(0, "LoginName too long - sorry.");
 978 #ifdef MULTIUSER
 979   if (multi && strlen(multi) > 20)
 980     Panic(0, "Screen owner name too long - sorry.");
 981 #endif
 982   if (strlen(home) > MAXPATHLEN - 25)
 983     Panic(0, "$HOME too long - sorry.");
 984
 985   attach_tty = "";
 986   if (!detached && !lsflag && !cmdflag && !(dflag && !mflag && !rflag && !xflag) && !(!mflag && !SockMatch && sty && !xflag))
 987     {
 988 #ifndef NAMEDPIPE
 989       int fl;
 990 #endif
 991
 992       /* ttyname implies isatty */
 993       SET_TTYNAME(1);
 994 #ifdef MULTIUSER
 995       tty_mode = (int)st.st_mode & 0777;
 996 #endif
 997
 998 #ifndef NAMEDPIPE
 999       fl = fcntl(0, F_GETFL, 0);
1000       if (fl != -1 && (fl & (O_RDWR|O_RDONLY|O_WRONLY)) == O_RDWR)
1001         attach_fd = 0;
1002 #endif
1003       if (attach_fd == -1)
1004         {
1005           if ((n = secopen(attach_tty, O_RDWR | O_NONBLOCK, 0)) < 0)
1006             Panic(0, "Cannot open your terminal '%s' - please check.", attach_tty);
1007           close(n);
1008         }
1009       debug2("attach_tty is %s, attach_fd is %d\n", attach_tty, attach_fd);
1010
1011       if ((attach_term = getenv("TERM")) == 0 || *attach_term == 0)
1012         Panic(0, "Please set a terminal type.");
1013       if (strlen(attach_term) > sizeof(D_termname) - 1)
1014         Panic(0, "$TERM too long - sorry.");
1015       GetTTY(0, &attach_Mode);
1016 #ifdef DEBUGGGGGGGGGGGGGGG
1017       DebugTTY(&attach_Mode);
1018 #endif /* DEBUG */
1019     }
1020
1021 #ifdef _MODE_T
1022   oumask = umask(0);            /* well, unsigned never fails? jw. */
1023 #else
1024   if ((oumask = (int)umask(0)) == -1)
1025     Panic(errno, "Cannot change umask to zero");
1026 #endif
1027   SockDir = getenv("SCREENDIR");
1028   if (SockDir)
1029     {
1030       if (strlen(SockDir) >= MAXPATHLEN - 1)
1031         Panic(0, "Ridiculously long $SCREENDIR - try again.");
1032 #ifdef MULTIUSER
1033       if (multi)
1034         Panic(0, "No $SCREENDIR with multi screens, please.");
1035 #endif
1036     }
1037 #ifdef MULTIUSER
1038   if (multiattach)
1039     {
1040 # ifndef SOCKDIR
1041       sprintf(SockPath, "%s/.screen", multi_home);
1042       SockDir = SockPath;
1043 # else
1044       SockDir = SOCKDIR;
1045       sprintf(SockPath, "%s/S-%s", SockDir, multi);
1046 # endif
1047     }
1048   else
1049 #endif
1050     {
1051 #ifndef SOCKDIR
1052       if (SockDir == 0)
1053         {
1054           sprintf(SockPath, "%s/.screen", home);
1055           SockDir = SockPath;
1056         }
1057 #endif
1058       if (SockDir)
1059         {
1060           if (access(SockDir, F_OK))
1061             {
1062               debug1("SockDir '%s' missing ...\n", SockDir);
1063               if (UserContext() > 0)
1064                 {
1065                   if (mkdir(SockDir, 0700))
1066                     UserReturn(0);
1067                   UserReturn(1);
1068                 }
1069               if (UserStatus() <= 0)
1070                 Panic(0, "Cannot make directory '%s'.", SockDir);
1071             }
1072           if (SockDir != SockPath)
1073             strcpy(SockPath, SockDir);
1074         }
1075 #ifdef SOCKDIR
1076       else
1077         {
1078           SockDir = SOCKDIR;
1079           if (lstat(SockDir, &st))
1080             {
1081               n = (eff_uid == 0 && (real_uid || eff_gid == real_gid)) ? 0755 :
1082                   (eff_gid != real_gid) ? 0775 :
1083 #ifdef S_ISVTX
1084                   0777|S_ISVTX;
1085 #else
1086                   0777;
1087 #endif
1088               if (mkdir(SockDir, n) == -1)
1089                 Panic(errno, "Cannot make directory '%s'", SockDir);
1090             }
1091           else
1092             {
1093               if (!S_ISDIR(st.st_mode))
1094                 Panic(0, "'%s' must be a directory.", SockDir);
1095               if (eff_uid == 0 && real_uid && (int)st.st_uid != eff_uid)
1096                 Panic(0, "Directory '%s' must be owned by root.", SockDir);
1097               n = (eff_uid == 0 && (real_uid || (st.st_mode & 0775) != 0775)) ? 0755 :
1098                   (eff_gid == (int)st.st_gid && eff_gid != real_gid) ? 0775 :
1099                   0777;
1100               if (((int)st.st_mode & 0777) != n)
1101                 Panic(0, "Directory '%s' must have mode %03o.", SockDir, n);
1102             }
1103           sprintf(SockPath, "%s/S-%s", SockDir, LoginName);
1104           if (access(SockPath, F_OK))
1105             {
1106               if (mkdir(SockPath, 0700) == -1)
1107                 Panic(errno, "Cannot make directory '%s'", SockPath);
1108               (void) chown(SockPath, real_uid, real_gid);
1109             }
1110         }
1111 #endif
1112     }
1113
1114   if (stat(SockPath, &st) == -1)
1115     Panic(errno, "Cannot access %s", SockPath);
1116   else
1117   if (!S_ISDIR(st.st_mode))
1118     Panic(0, "%s is not a directory.", SockPath);
1119 #ifdef MULTIUSER
1120   if (multi)
1121     {
1122       if ((int)st.st_uid != multi_uid)
1123         Panic(0, "%s is not the owner of %s.", multi, SockPath);
1124     }
1125   else
1126 #endif
1127     {
1128       if ((int)st.st_uid != real_uid)
1129         Panic(0, "You are not the owner of %s.", SockPath);
1130     }
1131   if ((st.st_mode & 0777) != 0700)
1132     Panic(0, "Directory %s must have mode 700.", SockPath);
1133   if (SockMatch && index(SockMatch, '/'))
1134     Panic(0, "Bad session name '%s'", SockMatch);
1135   SockName = SockPath + strlen(SockPath) + 1;
1136   *SockName = 0;
1137   (void) umask(oumask);
1138   debug2("SockPath: %s  SockMatch: %s\n", SockPath, SockMatch ? SockMatch : "NULL");
1139
1140 #if defined(SYSV) && !defined(ISC)
1141   if (uname(&utsnam) == -1)
1142     Panic(errno, "uname");
1143   strncpy(HostName, utsnam.nodename, sizeof(utsnam.nodename) < MAXSTR ? sizeof(utsnam.nodename) : MAXSTR - 1);
1144   HostName[sizeof(utsnam.nodename) < MAXSTR ? sizeof(utsnam.nodename) : MAXSTR - 1] = '\0';
1145 #else
1146   (void) gethostname(HostName, MAXSTR);
1147   HostName[MAXSTR - 1] = '\0';
1148 #endif
1149   if ((ap = index(HostName, '.')) != NULL)
1150     *ap = '\0';
1151
1152   if (lsflag)
1153     {
1154       int i, fo, oth;
1155
1156 #ifdef MULTIUSER
1157       if (multi)
1158         real_uid = multi_uid;
1159 #endif
1160       SET_GUID();
1161       i = FindSocket((int *)NULL, &fo, &oth, SockMatch);
1162       if (quietflag)
1163         exit(8 + (fo ? ((oth || i) ? 2 : 1) : 0) + i);
1164       if (fo == 0)
1165         Panic(0, "No Sockets found in %s.\n", SockPath);
1166       Panic(0, "%d Socket%s in %s.\n", fo, fo > 1 ? "s" : "", SockPath);
1167       /* NOTREACHED */
1168     }
1169   signal(SIG_BYE, AttacherFinit);       /* prevent races */
1170   if (cmdflag)
1171     {
1172       /* attach_tty is not mandatory */
1173       SET_TTYNAME(0);
1174       if (!*av)
1175         Panic(0, "Please specify a command.");
1176       SET_GUID();
1177       SendCmdMessage(sty, SockMatch, av);
1178       exit(0);
1179     }
1180   else if (rflag || xflag)
1181     {
1182       debug("screen -r: - is there anybody out there?\n");
1183       if (Attach(MSG_ATTACH))
1184         {
1185           Attacher();
1186           /* NOTREACHED */
1187         }
1188 #ifdef MULTIUSER
1189       if (multiattach)
1190         Panic(0, "Can't create sessions of other users.");
1191 #endif
1192       debug("screen -r: backend not responding -- still crying\n");
1193     }
1194   else if (dflag && !mflag)
1195     {
1196       SET_TTYNAME(0);
1197       Attach(MSG_DETACH);
1198       Msg(0, "[%s %sdetached.]\n", SockName, (dflag > 1 ? "power " : ""));
1199       eexit(0);
1200       /* NOTREACHED */
1201     }
1202   if (!SockMatch && !mflag && sty)
1203     {
1204       /* attach_tty is not mandatory */
1205       SET_TTYNAME(0);
1206       SET_GUID();
1207       nwin_options.args = av;
1208       SendCreateMsg(sty, &nwin);
1209       exit(0);
1210       /* NOTREACHED */
1211     }
1212   nwin_compose(&nwin_default, &nwin_options, &nwin_default);
1213
1214   if (!detached || dflag != 2)
1215     MasterPid = fork();
1216   else
1217     MasterPid = 0;
1218
1219   switch (MasterPid)
1220     {
1221     case -1:
1222       Panic(errno, "fork");
1223       /* NOTREACHED */
1224     case 0:
1225       break;
1226     default:
1227       if (detached)
1228         exit(0);
1229       if (SockMatch)
1230         sprintf(socknamebuf, "%d.%s", MasterPid, SockMatch);
1231       else
1232         sprintf(socknamebuf, "%d.%s.%s", MasterPid, stripdev(attach_tty), HostName);
1233       for (ap = socknamebuf; *ap; ap++)
1234         if (*ap == '/')
1235           *ap = '-';
1236 #ifdef NAME_MAX
1237       if (strlen(socknamebuf) > NAME_MAX)
1238         socknamebuf[NAME_MAX] = 0;
1239 #endif
1240       sprintf(SockPath + strlen(SockPath), "/%s", socknamebuf);
1241       SET_GUID();
1242       Attacher();
1243       /* NOTREACHED */
1244     }
1245
1246   if (!detached)
1247     PanicPid = getppid();
1248
1249   if (DefaultEsc == -1)
1250     DefaultEsc = Ctrl('a');
1251   if (DefaultMetaEsc == -1)
1252     DefaultMetaEsc = 'a';
1253
1254   ap = av0 + strlen(av0) - 1;
1255   while (ap >= av0)
1256     {
1257       if (!strncmp("screen", ap, 6))
1258         {
1259           strncpy(ap, "SCREEN", 6); /* name this process "SCREEN-BACKEND" */
1260           break;
1261         }
1262       ap--;
1263     }
1264   if (ap < av0)
1265     *av0 = 'S';
1266
1267 #ifdef DEBUG
1268   {
1269     char buf[256];
1270
1271     if (dfp && dfp != stderr)
1272       fclose(dfp);
1273     sprintf(buf, "%s/SCREEN.%d", DEBUGDIR, (int)getpid());
1274     if ((dfp = fopen(buf, "w")) == NULL)
1275       dfp = stderr;
1276     else
1277       (void) chmod(buf, 0666);
1278   }
1279 #endif
1280   if (!detached)
1281     {
1282       if (attach_fd == -1)
1283         {
1284           if ((n = secopen(attach_tty, O_RDWR, 0)) < 0)
1285             Panic(0, "Cannot reopen '%s' - please check.", attach_tty);
1286         }
1287       else
1288         n = dup(attach_fd);
1289     }
1290   else
1291     n = -1;
1292   freopen("/dev/null", "r", stdin);
1293   freopen("/dev/null", "w", stdout);
1294
1295 #ifdef DEBUG
1296   if (dfp != stderr)
1297 #endif
1298   freopen("/dev/null", "w", stderr);
1299   debug("-- screen.back debug started\n");
1300
1301   /*
1302    * This guarantees that the session owner is listed, even when we
1303    * start detached. From now on we should not refer to 'LoginName'
1304    * any more, use users->u_name instead.
1305    */
1306   if (UserAdd(LoginName, (char *)0, (struct acluser **)0) < 0)
1307     Panic(0, "Could not create user info");
1308   if (!detached)
1309     {
1310       if (MakeDisplay(LoginName, attach_tty, attach_term, n, getppid(), &attach_Mode) == 0)
1311         Panic(0, "Could not alloc display");
1312       PanicPid = 0;
1313 #ifdef ENCODINGS
1314       D_encoding = nwin_options.encoding > 0 ? nwin_options.encoding : 0;
1315       debug1("D_encoding = %d\n", D_encoding);
1316 #endif
1317     }
1318
1319   if (SockMatch)
1320     {
1321       /* user started us with -S option */
1322       sprintf(socknamebuf, "%d.%s", (int)getpid(), SockMatch);
1323     }
1324   else
1325     {
1326       sprintf(socknamebuf, "%d.%s.%s", (int)getpid(), stripdev(attach_tty),
1327               HostName);
1328     }
1329   for (ap = socknamebuf; *ap; ap++)
1330     if (*ap == '/')
1331       *ap = '-';
1332 #ifdef NAME_MAX
1333   if (strlen(socknamebuf) > NAME_MAX)
1334     {
1335       debug2("Socketname %s truncated to %d chars\n", socknamebuf, NAME_MAX);
1336       socknamebuf[NAME_MAX] = 0;
1337     }
1338 #endif
1339   sprintf(SockPath + strlen(SockPath), "/%s", socknamebuf);
1340
1341   ServerSocket = MakeServerSocket();
1342   InitKeytab();
1343 #ifdef ETCSCREENRC
1344 # ifdef ALLOW_SYSSCREENRC
1345   if ((ap = getenv("SYSSCREENRC")))
1346     (void)StartRc(ap, 0);
1347   else
1348 # endif
1349     (void)StartRc(ETCSCREENRC, 0);
1350 #endif
1351   (void)StartRc(RcFileName, 0);
1352 # ifdef UTMPOK
1353 #  ifndef UTNOKEEP
1354   InitUtmp();
1355 #  endif /* UTNOKEEP */
1356 # endif /* UTMPOK */
1357   if (display)
1358     {
1359       if (InitTermcap(0, 0))
1360         {
1361           debug("Could not init termcap - exiting\n");
1362           fcntl(D_userfd, F_SETFL, 0);  /* Flush sets FNBLOCK */
1363           freetty();
1364           if (D_userpid)
1365             Kill(D_userpid, SIG_BYE);
1366           eexit(1);
1367         }
1368       MakeDefaultCanvas();
1369       InitTerm(0);
1370 #ifdef UTMPOK
1371       RemoveLoginSlot();
1372 #endif
1373     }
1374   else
1375     MakeTermcap(1);
1376 #ifdef LOADAV
1377   InitLoadav();
1378 #endif /* LOADAV */
1379   MakeNewEnv();
1380   signal(SIGHUP, SigHup);
1381   signal(SIGINT, FinitHandler);
1382   signal(SIGQUIT, FinitHandler);
1383   signal(SIGTERM, FinitHandler);
1384 #ifdef BSDJOBS
1385   signal(SIGTTIN, SIG_IGN);
1386   signal(SIGTTOU, SIG_IGN);
1387 #endif
1388
1389   if (display)
1390     {
1391       brktty(D_userfd);
1392       SetMode(&D_OldMode, &D_NewMode, D_flow, iflag);
1393       /* Note: SetMode must be called _before_ FinishRc. */
1394       SetTTY(D_userfd, &D_NewMode);
1395       if (fcntl(D_userfd, F_SETFL, FNBLOCK))
1396         Msg(errno, "Warning: NBLOCK fcntl failed");
1397     }
1398   else
1399     brktty(-1);         /* just try */
1400   signal(SIGCHLD, SigChld);
1401 #ifdef ETCSCREENRC
1402 # ifdef ALLOW_SYSSCREENRC
1403   if ((ap = getenv("SYSSCREENRC")))
1404     FinishRc(ap);
1405   else
1406 # endif
1407     FinishRc(ETCSCREENRC);
1408 #endif
1409   FinishRc(RcFileName);
1410
1411   debug2("UID %d  EUID %d\n", (int)getuid(), (int)geteuid());
1412   if (windows == NULL)
1413     {
1414       debug("We open one default window, as screenrc did not specify one.\n");
1415       if (MakeWindow(&nwin) == -1)
1416         {
1417           Msg(0, "Sorry, could not find a PTY.");
1418           sleep(5);
1419           Finit(0);
1420           /* NOTREACHED */
1421         }
1422     }
1423
1424 #ifdef HAVE_BRAILLE
1425   StartBraille();
1426 #endif
1427
1428   if (display && default_startup)
1429     display_copyright();
1430   signal(SIGINT, SigInt);
1431   if (rflag && (rflag & 1) == 0 && !quietflag)
1432     {
1433       Msg(0, "New screen...");
1434       rflag = 0;
1435     }
1436
1437   serv_read.type = EV_READ;
1438   serv_read.fd = ServerSocket;
1439   serv_read.handler = serv_read_fn;
1440   evenq(&serv_read);
1441
1442   serv_select.pri = -10;
1443   serv_select.type = EV_ALWAYS;
1444   serv_select.handler = serv_select_fn;
1445   evenq(&serv_select);
1446
1447   logflushev.type = EV_TIMEOUT;
1448   logflushev.handler = logflush_fn;
1449
1450   sched();
1451   /* NOTREACHED */
1452   return 0;
1453 }
1454
1455 void
1456 WindowDied(p, wstat, wstat_valid)
1457 struct win *p;
1458 int wstat;
1459 int wstat_valid;
1460 {
1461   int killit = 0;
1462
1463   if (ZombieKey_destroy && ZombieKey_onerror && wstat_valid &&
1464       WIFEXITED(wstat) && WEXITSTATUS(wstat) == 0)
1465         killit = 1;
1466
1467   if (ZombieKey_destroy && !killit)
1468     {
1469       char buf[100], *s, reason[100];
1470       time_t now;
1471
1472       if (wstat_valid) {
1473         if (WIFEXITED(wstat))
1474           if (WEXITSTATUS(wstat))
1475             sprintf(reason, "terminated with exit status %d", WEXITSTATUS(wstat));
1476           else
1477             sprintf(reason, "terminated normally");
1478         else if (WIFSIGNALED(wstat))
1479           sprintf(reason, "terminated with signal %d%s", WTERMSIG(wstat),
1480 #ifdef WCOREDUMP
1481                           WCOREDUMP(wstat) ? " (core file generated)" : "");
1482 #else
1483                           "");
1484 #endif
1485       } else
1486         sprintf(reason, "detached from window");
1487
1488       (void) time(&now);
1489       s = ctime(&now);
1490       if (s && *s)
1491         s[strlen(s) - 1] = '\0';
1492       debug3("window %d (%s) going into zombie state fd %d",
1493              p->w_number, p->w_title, p->w_ptyfd);
1494 #ifdef UTMPOK
1495       if (p->w_slot != (slot_t)0 && p->w_slot != (slot_t)-1)
1496         {
1497           RemoveUtmp(p);
1498           p->w_slot = 0;        /* "detached" */
1499         }
1500 #endif
1501       CloseDevice(p);
1502
1503       p->w_deadpid = p->w_pid;
1504       p->w_pid = 0;
1505       ResetWindow(p);
1506       /* p->w_y = p->w_bot; */
1507       p->w_y = MFindUsedLine(p, p->w_bot, 1);
1508       sprintf(buf, "\n\r=== Command %s (%s) ===", reason, s ? s : "?");
1509       WriteString(p, buf, strlen(buf));
1510       WindowChanged(p, 'f');
1511     }
1512   else
1513     KillWindow(p);
1514 #ifdef UTMPOK
1515   CarefulUtmp();
1516 #endif
1517 }
1518
1519 static void
1520 SigChldHandler()
1521 {
1522   struct stat st;
1523 #ifdef DEBUG
1524   fds();
1525 #endif
1526   while (GotSigChld)
1527     {
1528       GotSigChld = 0;
1529       DoWait();
1530 #ifdef SYSVSIGS
1531       signal(SIGCHLD, SigChld);
1532 #endif
1533     }
1534   if (stat(SockPath, &st) == -1)
1535     {
1536       debug1("SigChldHandler: Yuck! cannot stat '%s'\n", SockPath);
1537       if (!RecoverSocket())
1538         {
1539           debug("SCREEN cannot recover from corrupt Socket, bye\n");
1540           Finit(1);
1541         }
1542       else
1543         debug1("'%s' reconstructed\n", SockPath);
1544     }
1545   else
1546     debug2("SigChldHandler: stat '%s' o.k. (%03o)\n", SockPath, (int)st.st_mode);
1547 }
1548
1549 static sigret_t
1550 SigChld SIGDEFARG
1551 {
1552   debug("SigChld()\n");
1553   GotSigChld = 1;
1554   SIGRETURN;
1555 }
1556
1557 sigret_t
1558 SigHup SIGDEFARG
1559 {
1560   /* Hangup all displays */
1561   while ((display = displays) != 0)
1562     Hangup();
1563   SIGRETURN;
1564 }
1565
1566 /*
1567  * the backend's Interrupt handler
1568  * we cannot insert the intrc directly, as we never know
1569  * if fore is valid.
1570  */
1571 static sigret_t
1572 SigInt SIGDEFARG
1573 {
1574 #if HAZARDOUS
1575   char ibuf;
1576
1577   debug("SigInt()\n");
1578   if (fore && displays)
1579     {
1580 # if defined(TERMIO) || defined(POSIX)
1581       ibuf = displays->d_OldMode.tio.c_cc[VINTR];
1582 # else
1583       ibuf = displays->d_OldMode.m_tchars.t_intrc;
1584 # endif
1585       fore->w_inlen = 0;
1586       write(fore->w_ptyfd, &ibuf, 1);
1587     }
1588 #else
1589   signal(SIGINT, SigInt);
1590   debug("SigInt() careful\n");
1591   InterruptPlease = 1;
1592 #endif
1593   SIGRETURN;
1594 }
1595
1596 static sigret_t
1597 CoreDump SIGDEFARG
1598 {
1599   struct display *disp;
1600   char buf[80];
1601
1602 #if defined(SYSVSIGS) && defined(SIGHASARG)
1603   signal(sigsig, SIG_IGN);
1604 #endif
1605   setgid(getgid());
1606   setuid(getuid());
1607   unlink("core");
1608 #ifdef SIGHASARG
1609   sprintf(buf, "\r\n[screen caught signal %d.%s]\r\n", sigsig,
1610 #else
1611   sprintf(buf, "\r\n[screen caught a fatal signal.%s]\r\n",
1612 #endif
1613 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1614               ""
1615 #else /* SHADOWPW  && !DEBUG */
1616               " (core dumped)"
1617 #endif /* SHADOWPW  && !DEBUG */
1618               );
1619   for (disp = displays; disp; disp = disp->d_next)
1620     {
1621       fcntl(disp->d_userfd, F_SETFL, 0);
1622       SetTTY(disp->d_userfd, &D_OldMode);
1623       write(disp->d_userfd, buf, strlen(buf));
1624       Kill(disp->d_userpid, SIG_BYE);
1625     }
1626 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1627   Kill(getpid(), SIGKILL);
1628   eexit(11);
1629 #else /* SHADOWPW && !DEBUG */
1630   abort();
1631 #endif /* SHADOWPW  && !DEBUG */
1632   SIGRETURN;
1633 }
1634
1635 static void
1636 DoWait()
1637 {
1638   register int pid;
1639   struct win *p, *next;
1640 #ifdef BSDWAIT
1641   union wait wstat;
1642 #else
1643   int wstat;
1644 #endif
1645
1646 #ifdef BSDJOBS
1647 # ifndef BSDWAIT
1648   while ((pid = waitpid(-1, &wstat, WNOHANG | WUNTRACED)) > 0)
1649 # else
1650 # ifdef USE_WAIT2
1651   /*
1652    * From: rouilj@sni-usa.com (John Rouillard)
1653    * note that WUNTRACED is not documented to work, but it is defined in
1654    * /usr/include/sys/wait.h, so it may work
1655    */
1656   while ((pid = wait2(&wstat, WNOHANG | WUNTRACED )) > 0)
1657 #  else /* USE_WAIT2 */
1658   while ((pid = wait3(&wstat, WNOHANG | WUNTRACED, (struct rusage *) 0)) > 0)
1659 #  endif /* USE_WAIT2 */
1660 # endif
1661 #else   /* BSDJOBS */
1662   while ((pid = wait(&wstat)) < 0)
1663     if (errno != EINTR)
1664       break;
1665   if (pid > 0)
1666 #endif  /* BSDJOBS */
1667     {
1668       for (p = windows; p; p = next)
1669         {
1670           next = p->w_next;
1671           if (  (p->w_pid     && pid == p->w_pid) ||
1672                 (p->w_deadpid && pid == p->w_deadpid) )
1673             {
1674               /* child has ceased to exist */
1675               p->w_pid = 0;
1676
1677 #ifdef BSDJOBS
1678               if (WIFSTOPPED(wstat))
1679                 {
1680                   debug3("Window %d pid %d: WIFSTOPPED (sig %d)\n", p->w_number, pid, WSTOPSIG(wstat));
1681 #ifdef SIGTTIN
1682                   if (WSTOPSIG(wstat) == SIGTTIN)
1683                     {
1684                       Msg(0, "Suspended (tty input)");
1685                       continue;
1686                     }
1687 #endif
1688 #ifdef SIGTTOU
1689                   if (WSTOPSIG(wstat) == SIGTTOU)
1690                     {
1691                       Msg(0, "Suspended (tty output)");
1692                       continue;
1693                     }
1694 #endif
1695                   /* Try to restart process */
1696                   Msg(0, "Child has been stopped, restarting.");
1697                   if (killpg(pid, SIGCONT))
1698                     kill(pid, SIGCONT);
1699                 }
1700               else
1701 #endif
1702                 {
1703                   WindowDied(p, wstat, 1);
1704                 }
1705               break;
1706             }
1707 #ifdef PSEUDOS
1708           if (p->w_pwin && pid == p->w_pwin->p_pid)
1709             {
1710               debug2("pseudo of win Nr %d died. pid == %d\n", p->w_number, p->w_pwin->p_pid);
1711               FreePseudowin(p);
1712               break;
1713             }
1714 #endif
1715         }
1716       if (p == 0)
1717         {
1718           debug1("pid %d not found - hope that's ok\n", pid);
1719         }
1720     }
1721 }
1722
1723
1724 static sigret_t
1725 FinitHandler SIGDEFARG
1726 {
1727 #ifdef SIGHASARG
1728   debug1("FinitHandler called, sig %d.\n", sigsig);
1729 #else
1730   debug("FinitHandler called.\n");
1731 #endif
1732   Finit(1);
1733   SIGRETURN;
1734 }
1735
1736 void
1737 Finit(i)
1738 int i;
1739 {
1740   signal(SIGCHLD, SIG_DFL);
1741   signal(SIGHUP, SIG_IGN);
1742   debug1("Finit(%d);\n", i);
1743   while (windows)
1744     {
1745       struct win *p = windows;
1746       windows = windows->w_next;
1747       FreeWindow(p);
1748     }
1749   if (ServerSocket != -1)
1750     {
1751       debug1("we unlink(%s)\n", SockPath);
1752 #ifdef USE_SETEUID
1753       xseteuid(real_uid);
1754       xsetegid(real_gid);
1755 #endif
1756       (void) unlink(SockPath);
1757 #ifdef USE_SETEUID
1758       xseteuid(eff_uid);
1759       xsetegid(eff_gid);
1760 #endif
1761     }
1762   for (display = displays; display; display = display->d_next)
1763     {
1764       if (D_status)
1765         RemoveStatus();
1766       FinitTerm();
1767 #ifdef UTMPOK
1768       RestoreLoginSlot();
1769 #endif
1770       AddStr("[screen is terminating]\r\n");
1771       Flush();
1772       SetTTY(D_userfd, &D_OldMode);
1773       fcntl(D_userfd, F_SETFL, 0);
1774       freetty();
1775       Kill(D_userpid, SIG_BYE);
1776     }
1777   /*
1778    * we _cannot_ call eexit(i) here,
1779    * instead of playing with the Socket above. Sigh.
1780    */
1781   exit(i);
1782 }
1783
1784 void
1785 eexit(e)
1786 int e;
1787 {
1788   debug("eexit\n");
1789   if (ServerSocket != -1)
1790     {
1791       debug1("we unlink(%s)\n", SockPath);
1792       setgid(real_gid);
1793       setuid(real_uid);
1794       (void) unlink(SockPath);
1795     }
1796   exit(e);
1797 }
1798
1799 void
1800 Hangup()
1801 {
1802   if (display == 0)
1803     return;
1804   debug1("Hangup %x\n", display);
1805   if (D_userfd >= 0)
1806     {
1807       close(D_userfd);
1808       D_userfd = -1;
1809     }
1810   if (auto_detach || displays->d_next)
1811     Detach(D_HANGUP);
1812   else
1813     Finit(0);
1814 }
1815
1816 /*
1817  * Detach now has the following modes:
1818  *D_DETACH       SIG_BYE        detach backend and exit attacher
1819  *D_HANGUP       SIG_BYE        detach backend and exit attacher
1820  *D_STOP         SIG_STOP       stop attacher (and detach backend)
1821  *D_REMOTE       SIG_BYE        remote detach -- reattach to new attacher
1822  *D_POWER        SIG_POWER_BYE  power detach -- attacher kills his parent
1823  *D_REMOTE_POWER SIG_POWER_BYE  remote power detach -- both
1824  *D_LOCK         SIG_LOCK       lock the attacher
1825  * (jw)
1826  * we always remove our utmp slots. (even when "lock" or "stop")
1827  * Note: Take extra care here, we may be called by interrupt!
1828  */
1829 void
1830 Detach(mode)
1831 int mode;
1832 {
1833   int sign = 0, pid;
1834   struct canvas *cv;
1835   struct win *p;
1836
1837   if (display == 0)
1838     return;
1839
1840 #define AddStrSock(msg) do { \
1841     if (SockName) \
1842       { \
1843         AddStr("[" msg " from "); \
1844         AddStr(SockName); \
1845         AddStr("]\r\n"); \
1846       } \
1847     else \
1848       AddStr("[" msg "]\r\n"); \
1849   } while (0)
1850
1851   signal(SIGHUP, SIG_IGN);
1852   debug1("Detach(%d)\n", mode);
1853   if (D_status)
1854     RemoveStatus();
1855   FinitTerm();
1856   if (!display)
1857     return;
1858   switch (mode)
1859     {
1860     case D_HANGUP:
1861       sign = SIG_BYE;
1862       break;
1863     case D_DETACH:
1864       AddStrSock("detached");
1865       sign = SIG_BYE;
1866       break;
1867 #ifdef BSDJOBS
1868     case D_STOP:
1869       sign = SIG_STOP;
1870       break;
1871 #endif
1872 #ifdef REMOTE_DETACH
1873     case D_REMOTE:
1874       AddStrSock("remote detached");
1875       sign = SIG_BYE;
1876       break;
1877 #endif
1878 #ifdef POW_DETACH
1879     case D_POWER:
1880       AddStrSock("power detached");
1881       if (PowDetachString)
1882         {
1883           AddStr(PowDetachString);
1884           AddStr("\r\n");
1885         }
1886       sign = SIG_POWER_BYE;
1887       break;
1888 #ifdef REMOTE_DETACH
1889     case D_REMOTE_POWER:
1890       AddStrSock("remote power detached");
1891       if (PowDetachString)
1892         {
1893           AddStr(PowDetachString);
1894           AddStr("\r\n");
1895         }
1896       sign = SIG_POWER_BYE;
1897       break;
1898 #endif
1899 #endif
1900     case D_LOCK:
1901       ClearAll();
1902       sign = SIG_LOCK;
1903       /* tell attacher to lock terminal with a lockprg. */
1904       break;
1905     }
1906 #ifdef UTMPOK
1907   if (displays->d_next == 0)
1908     {
1909       for (p = windows; p; p = p->w_next)
1910         {
1911           if (p->w_slot != (slot_t) -1 && !(p->w_lflag & 2))
1912             {
1913               RemoveUtmp(p);
1914               /*
1915                * Set the slot to 0 to get the window
1916                * logged in again.
1917                */
1918               p->w_slot = (slot_t) 0;
1919             }
1920         }
1921     }
1922   if (mode != D_HANGUP)
1923     RestoreLoginSlot();
1924 #endif
1925   if (displays->d_next == 0 && console_window)
1926     {
1927       if (TtyGrabConsole(console_window->w_ptyfd, 0, "detach"))
1928         {
1929           debug("could not release console - killing window\n");
1930           KillWindow(console_window);
1931           display = displays;           /* restore display */
1932         }
1933     }
1934   if (D_fore)
1935     {
1936 #ifdef MULTIUSER
1937       ReleaseAutoWritelock(display, D_fore);
1938 #endif
1939       D_user->u_detachwin = D_fore->w_number;
1940       D_user->u_detachotherwin = D_other ? D_other->w_number : -1;
1941     }
1942   AutosaveLayout(D_layout);
1943   layout_last = D_layout;
1944   for (cv = D_cvlist; cv; cv = cv->c_next)
1945     {
1946       p = Layer2Window(cv->c_layer);
1947       SetCanvasWindow(cv, 0);
1948       if (p)
1949         WindowChanged(p, 'u');
1950     }
1951
1952   pid = D_userpid;
1953   debug2("display: %#x displays: %#x\n", (unsigned int)display, (unsigned int)displays);
1954   FreeDisplay();
1955   if (displays == 0)
1956     /* Flag detached-ness */
1957     (void) chsock();
1958   /*
1959    * tell father what to do. We do that after we
1960    * freed the tty, thus getty feels more comfortable on hpux
1961    * if it was a power detach.
1962    */
1963   Kill(pid, sign);
1964   debug2("Detach: Signal %d to Attacher(%d)!\n", sign, pid);
1965   debug("Detach returns, we are successfully detached.\n");
1966   signal(SIGHUP, SigHup);
1967 #undef AddStrSock
1968 }
1969
1970 static int
1971 IsSymbol(e, s)
1972 char *e, *s;
1973 {
1974   register int l;
1975
1976   l = strlen(s);
1977   return strncmp(e, s, l) == 0 && e[l] == '=';
1978 }
1979
1980 void
1981 MakeNewEnv()
1982 {
1983   register char **op, **np;
1984   static char stybuf[MAXSTR];
1985
1986   for (op = environ; *op; ++op)
1987     ;
1988   if (NewEnv)
1989     free((char *)NewEnv);
1990   NewEnv = np = (char **) malloc((unsigned) (op - environ + 7 + 1) * sizeof(char **));
1991   if (!NewEnv)
1992     Panic(0, strnomem);
1993   sprintf(stybuf, "STY=%s", strlen(SockName) <= MAXSTR - 5 ? SockName : "?");
1994   *np++ = stybuf;                       /* NewEnv[0] */
1995   *np++ = Term;                 /* NewEnv[1] */
1996   np++;         /* room for SHELL */
1997 #ifdef TIOCSWINSZ
1998   np += 2;      /* room for TERMCAP and WINDOW */
1999 #else
2000   np += 4;      /* room for TERMCAP WINDOW LINES COLUMNS */
2001 #endif
2002
2003   for (op = environ; *op; ++op)
2004     {
2005       if (!IsSymbol(*op, "TERM") && !IsSymbol(*op, "TERMCAP")
2006           && !IsSymbol(*op, "STY") && !IsSymbol(*op, "WINDOW")
2007           && !IsSymbol(*op, "SCREENCAP") && !IsSymbol(*op, "SHELL")
2008           && !IsSymbol(*op, "LINES") && !IsSymbol(*op, "COLUMNS")
2009          )
2010         *np++ = *op;
2011     }
2012   *np = 0;
2013 }
2014
2015 void
2016 /*VARARGS2*/
2017 #if defined(USEVARARGS) && defined(__STDC__)
2018 Msg(int err, char *fmt, VA_DOTS)
2019 #else
2020 Msg(err, fmt, VA_DOTS)
2021 int err;
2022 char *fmt;
2023 VA_DECL
2024 #endif
2025 {
2026   VA_LIST(ap)
2027   char buf[MAXPATHLEN*2];
2028   char *p = buf;
2029
2030   VA_START(ap, fmt);
2031   fmt = DoNLS(fmt);
2032   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
2033   VA_END(ap);
2034   if (err)
2035     {
2036       p += strlen(p);
2037       *p++ = ':';
2038       *p++ = ' ';
2039       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
2040       buf[sizeof(buf) - 1] = 0;
2041     }
2042   debug2("Msg('%s') (%#x);\n", buf, (unsigned int)display);
2043
2044   if (display && displays)
2045     MakeStatus(buf);
2046   else if (displays)
2047     {
2048       for (display = displays; display; display = display->d_next)
2049         MakeStatus(buf);
2050     }
2051   else if (display)
2052     {
2053       /* no displays but a display - must have forked.
2054        * send message to backend!
2055        */
2056       char *tty = D_usertty;
2057       struct display *olddisplay = display;
2058       display = 0;      /* only send once */
2059       SendErrorMsg(tty, buf);
2060       display = olddisplay;
2061     }
2062   else
2063     printf("%s\r\n", buf);
2064 }
2065
2066 /*
2067  * Call FinitTerm for all displays, write a message to each and call eexit();
2068  */
2069 void
2070 /*VARARGS2*/
2071 #if defined(USEVARARGS) && defined(__STDC__)
2072 Panic(int err, char *fmt, VA_DOTS)
2073 #else
2074 Panic(err, fmt, VA_DOTS)
2075 int err;
2076 char *fmt;
2077 VA_DECL
2078 #endif
2079 {
2080   VA_LIST(ap)
2081   char buf[MAXPATHLEN*2];
2082   char *p = buf;
2083
2084   VA_START(ap, fmt);
2085   fmt = DoNLS(fmt);
2086   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
2087   VA_END(ap);
2088   if (err)
2089     {
2090       p += strlen(p);
2091       *p++ = ':';
2092       *p++ = ' ';
2093       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
2094       buf[sizeof(buf) - 1] = 0;
2095     }
2096   debug3("Panic('%s'); display=%x displays=%x\n", buf, display, displays);
2097   if (displays == 0 && display == 0)
2098     {
2099       printf("%s\r\n", buf);
2100       if (PanicPid)
2101         Kill(PanicPid, SIG_BYE);
2102     }
2103   else if (displays == 0)
2104     {
2105       /* no displays but a display - must have forked.
2106        * send message to backend!
2107        */
2108       char *tty = D_usertty;
2109       display = 0;
2110       SendErrorMsg(tty, buf);
2111       sleep(2);
2112       _exit(1);
2113     }
2114   else
2115     for (display = displays; display; display = display->d_next)
2116       {
2117         if (D_status)
2118           RemoveStatus();
2119         FinitTerm();
2120         Flush();
2121 #ifdef UTMPOK
2122         RestoreLoginSlot();
2123 #endif
2124         SetTTY(D_userfd, &D_OldMode);
2125         fcntl(D_userfd, F_SETFL, 0);
2126         write(D_userfd, buf, strlen(buf));
2127         write(D_userfd, "\n", 1);
2128         freetty();
2129         if (D_userpid)
2130           Kill(D_userpid, SIG_BYE);
2131       }
2132 #ifdef MULTIUSER
2133   if (tty_oldmode >= 0)
2134     {
2135 # ifdef USE_SETEUID
2136       if (setuid(own_uid))
2137         xseteuid(own_uid);      /* may be a loop. sigh. */
2138 # else
2139       setuid(own_uid);
2140 # endif
2141       debug1("Panic: changing back modes from %s\n", attach_tty);
2142       chmod(attach_tty, tty_oldmode);
2143     }
2144 #endif
2145   eexit(1);
2146 }
2147
2148
2149 /*
2150  * '^' is allowed as an escape mechanism for control characters. jw.
2151  *
2152  * Added time insertion using ideas/code from /\ndy Jones
2153  *   (andy@lingua.cltr.uq.OZ.AU) - thanks a lot!
2154  *
2155  */
2156
2157 #ifndef USE_LOCALE
2158 static const char days[]   = "SunMonTueWedThuFriSat";
2159 static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
2160 #endif
2161
2162 static char winmsg_buf[MAXSTR];
2163 #define MAX_WINMSG_REND 16      /* rendition changes */
2164 static int winmsg_rend[MAX_WINMSG_REND];
2165 static int winmsg_rendpos[MAX_WINMSG_REND];
2166 static int winmsg_numrend;
2167
2168 static char *
2169 pad_expand(buf, p, numpad, padlen)
2170 char *buf;
2171 char *p;
2172 int numpad;
2173 int padlen;
2174 {
2175   char *pn, *pn2;
2176   int i, r;
2177
2178   padlen = padlen - (p - buf);  /* space for rent */
2179   if (padlen < 0)
2180     padlen = 0;
2181   pn2 = pn = p + padlen;
2182   r = winmsg_numrend;
2183   while (p >= buf)
2184     {
2185       if (r && *p != 127 && p - buf == winmsg_rendpos[r - 1])
2186         {
2187           winmsg_rendpos[--r] = pn - buf;
2188           continue;
2189         }
2190       *pn-- = *p;
2191       if (*p-- == 127)
2192         {
2193           pn[1] = ' ';
2194           i = numpad > 0 ? (padlen + numpad - 1) / numpad : 0;
2195           padlen -= i;
2196           while (i-- > 0)
2197             *pn-- = ' ';
2198           numpad--;
2199           if (r && p - buf == winmsg_rendpos[r - 1])
2200             winmsg_rendpos[--r] = pn - buf;
2201         }
2202     }
2203   return pn2;
2204 }
2205
2206 struct backtick {
2207   struct backtick *next;
2208   int num;
2209   int tick;
2210   int lifespan;
2211   time_t bestbefore;
2212   char result[MAXSTR];
2213   char **cmdv;
2214   struct event ev;
2215   char *buf;
2216   int bufi;
2217 };
2218
2219 struct backtick *backticks;
2220
2221 static void
2222 backtick_filter(bt)
2223 struct backtick *bt;
2224 {
2225   char *p, *q;
2226   int c;
2227
2228   for (p = q = bt->result; (c = (unsigned char)*p++) != 0;)
2229     {
2230       if (c == '\t')
2231         c = ' ';
2232       if (c >= ' ' || c == '\005')
2233         *q++ = c;
2234     }
2235   *q = 0;
2236 }
2237
2238 static void
2239 backtick_fn(ev, data)
2240 struct event *ev;
2241 char *data;
2242 {
2243   struct backtick *bt;
2244   int i, j, k, l;
2245
2246   bt = (struct backtick *)data;
2247   debug1("backtick_fn for #%d\n", bt->num);
2248   i = bt->bufi;
2249   l = read(ev->fd, bt->buf + i, MAXSTR - i);
2250   if (l <= 0)
2251     {
2252       debug1("EOF on backtick #%d\n", bt->num);
2253       evdeq(ev);
2254       close(ev->fd);
2255       ev->fd = -1;
2256       return;
2257     }
2258   debug1("read %d bytes\n", l);
2259   i += l;
2260   for (j = 0; j < l; j++)
2261     if (bt->buf[i - j - 1] == '\n')
2262       break;
2263   if (j < l)
2264     {
2265       for (k = i - j - 2; k >= 0; k--)
2266         if (bt->buf[k] == '\n')
2267           break;
2268       k++;
2269       bcopy(bt->buf + k, bt->result, i - j - k);
2270       bt->result[i - j - k - 1] = 0;
2271       backtick_filter(bt);
2272       WindowChanged(0, '`');
2273     }
2274   if (j == l && i == MAXSTR)
2275     {
2276       j = MAXSTR/2;
2277       l = j + 1;
2278     }
2279   if (j < l)
2280     {
2281       if (j)
2282         bcopy(bt->buf + i - j, bt->buf, j);
2283       i = j;
2284     }
2285   bt->bufi = i;
2286 }
2287
2288 void
2289 setbacktick(num, lifespan, tick, cmdv)
2290 int num;
2291 int lifespan;
2292 int tick;
2293 char **cmdv;
2294 {
2295   struct backtick **btp, *bt;
2296   char **v;
2297
2298   debug1("setbacktick called for backtick #%d\n", num);
2299   for (btp = &backticks; (bt = *btp) != 0; btp = &bt->next)
2300     if (bt->num == num)
2301       break;
2302   if (!bt && !cmdv)
2303     return;
2304   if (bt)
2305     {
2306       for (v = bt->cmdv; *v; v++)
2307         free(*v);
2308       free(bt->cmdv);
2309       if (bt->buf)
2310         free(bt->buf);
2311       if (bt->ev.fd >= 0)
2312         close(bt->ev.fd);
2313       evdeq(&bt->ev);
2314     }
2315   if (bt && !cmdv)
2316     {
2317       *btp = bt->next;
2318       free(bt);
2319       return;
2320     }
2321   if (!bt)
2322     {
2323       bt = (struct backtick *)malloc(sizeof *bt);
2324       if (!bt)
2325         {
2326           Msg(0, strnomem);
2327           return;
2328         }
2329       bzero(bt, sizeof(*bt));
2330       bt->next = 0;
2331       *btp = bt;
2332     }
2333   bt->num = num;
2334   bt->tick = tick;
2335   bt->lifespan = lifespan;
2336   bt->bestbefore = 0;
2337   bt->result[0] = 0;
2338   bt->buf = 0;
2339   bt->bufi = 0;
2340   bt->cmdv = cmdv;
2341   bt->ev.fd = -1;
2342   if (bt->tick == 0 && bt->lifespan == 0)
2343     {
2344       debug("setbacktick: continuous mode\n");
2345       bt->buf = (char *)malloc(MAXSTR);
2346       if (bt->buf == 0)
2347         {
2348           Msg(0, strnomem);
2349           setbacktick(num, 0, 0, (char **)0);
2350           return;
2351         }
2352       bt->ev.type = EV_READ;
2353       bt->ev.fd = readpipe(bt->cmdv);
2354       bt->ev.handler = backtick_fn;
2355       bt->ev.data = (char *)bt;
2356       if (bt->ev.fd >= 0)
2357         evenq(&bt->ev);
2358     }
2359 }
2360
2361 static char *
2362 runbacktick(bt, tickp, now)
2363 struct backtick *bt;
2364 int *tickp;
2365 time_t now;
2366 {
2367   int f, i, l, j;
2368   time_t now2;
2369
2370   debug1("runbacktick called for backtick #%d\n", bt->num);
2371   if (bt->tick && (!*tickp || bt->tick < *tickp))
2372     *tickp = bt->tick;
2373   if ((bt->lifespan == 0 && bt->tick == 0) || now < bt->bestbefore)
2374     {
2375       debug1("returning old result (%d)\n", bt->lifespan);
2376       return bt->result;
2377     }
2378   f = readpipe(bt->cmdv);
2379   if (f == -1)
2380     return bt->result;
2381   i = 0;
2382   while ((l = read(f, bt->result + i, sizeof(bt->result) - i)) > 0)
2383     {
2384       debug1("runbacktick: read %d bytes\n", l);
2385       i += l;
2386       for (j = 1; j < l; j++)
2387         if (bt->result[i - j - 1] == '\n')
2388           break;
2389       if (j == l && i == sizeof(bt->result))
2390         {
2391           j = sizeof(bt->result) / 2;
2392           l = j + 1;
2393         }
2394       if (j < l)
2395         {
2396           bcopy(bt->result + i - j, bt->result, j);
2397           i = j;
2398         }
2399     }
2400   close(f);
2401   bt->result[sizeof(bt->result) - 1] = '\n';
2402   if (i && bt->result[i - 1] == '\n')
2403     i--;
2404   debug1("runbacktick: finished, %d bytes\n", i);
2405   bt->result[i] = 0;
2406   backtick_filter(bt);
2407   (void)time(&now2);
2408   bt->bestbefore = now2 + bt->lifespan;
2409   return bt->result;
2410 }
2411
2412 char *
2413 MakeWinMsgEv(str, win, esc, padlen, ev, rec)
2414 char *str;
2415 struct win *win;
2416 int esc;
2417 int padlen;
2418 struct event *ev;
2419 int rec;
2420 {
2421   static int tick;
2422   char *s = str;
2423   register char *p = winmsg_buf;
2424   register int ctrl;
2425   struct timeval now;
2426   struct tm *tm;
2427   int l, i, r;
2428   int num;
2429   int zeroflg;
2430   int longflg;
2431   int minusflg;
2432   int plusflg;
2433   int qmflag = 0, omflag = 0, qmnumrend = 0;
2434   char *qmpos = 0;
2435   int numpad = 0;
2436   int lastpad = 0;
2437   int truncpos = -1;
2438   int truncper = 0;
2439   int trunclong = 0;
2440   struct backtick *bt;
2441
2442   if (winmsg_numrend >= 0)
2443     winmsg_numrend = 0;
2444   else
2445     winmsg_numrend = -winmsg_numrend;
2446
2447   tick = 0;
2448   tm = 0;
2449   ctrl = 0;
2450   gettimeofday(&now, NULL);
2451   for (; *s && (l = winmsg_buf + MAXSTR - 1 - p) > 0; s++, p++)
2452     {
2453       *p = *s;
2454       if (ctrl)
2455         {
2456           ctrl = 0;
2457           if (*s != '^' && *s >= 64)
2458             *p &= 0x1f;
2459           continue;
2460         }
2461       if (*s != esc)
2462         {
2463           if (esc == '%')
2464             {
2465               switch (*s)
2466                 {
2467 #if 0
2468                 case '~':
2469                   *p = BELL;
2470                   break;
2471 #endif
2472                 case '^':
2473                   ctrl = 1;
2474                   *p-- = '^';
2475                   break;
2476                 default:
2477                   break;
2478                 }
2479             }
2480           continue;
2481         }
2482       if (*++s == esc)  /* double escape ? */
2483         continue;
2484       if ((plusflg = *s == '+') != 0)
2485         s++;
2486       if ((minusflg = *s == '-') != 0)
2487         s++;
2488       if ((zeroflg = *s == '0') != 0)
2489         s++;
2490       num = 0;
2491       while(*s >= '0' && *s <= '9')
2492         num = num * 10 + (*s++ - '0');
2493       if ((longflg = *s == 'L') != 0)
2494         s++;
2495       switch (*s)
2496         {
2497         case '?':
2498           p--;
2499           if (qmpos)
2500             {
2501               if ((!qmflag && !omflag) || omflag == 1)
2502                 {
2503                   p = qmpos;
2504                   if (qmnumrend < winmsg_numrend)
2505                     winmsg_numrend = qmnumrend;
2506                 }
2507               qmpos = 0;
2508               break;
2509             }
2510           qmpos = p;
2511           qmnumrend = winmsg_numrend;
2512           qmflag = omflag = 0;
2513           break;
2514         case ':':
2515           p--;
2516           if (!qmpos)
2517             break;
2518           if (qmflag && omflag != 1)
2519             {
2520               omflag = 1;
2521               qmpos = p;
2522               qmnumrend = winmsg_numrend;
2523             }
2524           else
2525             {
2526               p = qmpos;
2527               if (qmnumrend < winmsg_numrend)
2528                 winmsg_numrend = qmnumrend;
2529               omflag = -1;
2530             }
2531           break;
2532         case 'd': case 'D': case 'm': case 'M': case 'y': case 'Y':
2533         case 'a': case 'A': case 's': case 'c': case 'C':
2534           if (l < 4)
2535             break;
2536           if (tm == 0)
2537             {
2538               time_t nowsec = now.tv_sec;
2539               tm = localtime(&nowsec);
2540             }
2541           qmflag = 1;
2542           if (!tick || tick > 3600)
2543             tick = 3600;
2544           switch (*s)
2545             {
2546             case 'd':
2547               sprintf(p, "%02d", tm->tm_mday % 100);
2548               break;
2549             case 'D':
2550 #ifdef USE_LOCALE
2551               strftime(p, l, (longflg ? "%A" : "%a"), tm);
2552 #else
2553               sprintf(p, "%3.3s", days + 3 * tm->tm_wday);
2554 #endif
2555               break;
2556             case 'm':
2557               sprintf(p, "%02d", tm->tm_mon + 1);
2558               break;
2559             case 'M':
2560 #ifdef USE_LOCALE
2561               strftime(p, l, (longflg ? "%B" : "%b"), tm);
2562 #else
2563               sprintf(p, "%3.3s", months + 3 * tm->tm_mon);
2564 #endif
2565               break;
2566             case 'y':
2567               sprintf(p, "%02d", tm->tm_year % 100);
2568               break;
2569             case 'Y':
2570               sprintf(p, "%04d", tm->tm_year + 1900);
2571               break;
2572             case 'a':
2573               sprintf(p, tm->tm_hour >= 12 ? "pm" : "am");
2574               break;
2575             case 'A':
2576               sprintf(p, tm->tm_hour >= 12 ? "PM" : "AM");
2577               break;
2578             case 's':
2579               sprintf(p, "%02d", tm->tm_sec);
2580               tick = 1;
2581               break;
2582             case 'c':
2583               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", tm->tm_hour, tm->tm_min);
2584               if (!tick || tick > 60)
2585                 tick = 60;
2586               break;
2587             case 'C':
2588               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", (tm->tm_hour + 11) % 12 + 1, tm->tm_min);
2589               if (!tick || tick > 60)
2590                 tick = 60;
2591               break;
2592             default:
2593               break;
2594             }
2595           p += strlen(p) - 1;
2596           break;
2597         case 'l':
2598 #ifdef LOADAV
2599           *p = 0;
2600           if (l > 20)
2601             AddLoadav(p);
2602           if (*p)
2603             {
2604               qmflag = 1;
2605               p += strlen(p) - 1;
2606             }
2607           else
2608             *p = '?';
2609           if (!tick || tick > 60)
2610             tick = 60;
2611 #else
2612           *p = '?';
2613 #endif
2614           p += strlen(p) - 1;
2615           break;
2616         case '`':
2617         case 'h':
2618           if (rec >= 10 || (*s == 'h' && (win == 0 || win->w_hstatus == 0 || *win->w_hstatus == 0)))
2619             {
2620               p--;
2621               break;
2622             }
2623           if (*s == '`')
2624             {
2625               for (bt = backticks; bt; bt = bt->next)
2626                 if (bt->num == num)
2627                   break;
2628               if (bt == 0)
2629                 {
2630                   p--;
2631                   break;
2632                 }
2633             }
2634             {
2635               char savebuf[sizeof(winmsg_buf)];
2636               int oldtick = tick;
2637               int oldnumrend = winmsg_numrend;
2638
2639               *p = 0;
2640               strcpy(savebuf, winmsg_buf);
2641               winmsg_numrend = -winmsg_numrend;
2642               MakeWinMsgEv(*s == 'h' ? win->w_hstatus : runbacktick(bt, &oldtick, now.tv_sec), win, '\005', 0, (struct event *)0, rec + 1);
2643               debug2("oldtick=%d tick=%d\n", oldtick, tick);
2644               if (!tick || oldtick < tick)
2645                 tick = oldtick;
2646               if ((int)strlen(winmsg_buf) < l)
2647                 strcat(savebuf, winmsg_buf);
2648               strcpy(winmsg_buf, savebuf);
2649               while (oldnumrend < winmsg_numrend)
2650                 winmsg_rendpos[oldnumrend++] += p - winmsg_buf;
2651               if (*p)
2652                 qmflag = 1;
2653               p += strlen(p) - 1;
2654             }
2655           break;
2656         case 'w':
2657         case 'W':
2658           {
2659             struct win *oldfore = 0;
2660             char *ss;
2661
2662             if (display)
2663               {
2664                 oldfore = D_fore;
2665                 D_fore = win;
2666               }
2667             ss = AddWindows(p, l - 1, (*s == 'w' ? 0 : 1) | (longflg ? 0 : 2) | (plusflg ? 4 : 0), win ? win->w_number : -1);
2668             if (minusflg)
2669                *ss = 0;
2670             if (display)
2671               D_fore = oldfore;
2672           }
2673           if (*p)
2674             qmflag = 1;
2675           p += strlen(p) - 1;
2676           break;
2677         case 'u':
2678           *p = 0;
2679           if (win)
2680             AddOtherUsers(p, l - 1, win);
2681           if (*p)
2682             qmflag = 1;
2683           p += strlen(p) - 1;
2684           break;
2685         case 'f':
2686           *p = 0;
2687           if (win)
2688             AddWindowFlags(p, l - 1, win);
2689           if (*p)
2690             qmflag = 1;
2691           p += strlen(p) - 1;
2692           break;
2693         case 't':
2694           *p = 0;
2695           if (win && (int)strlen(win->w_title) < l)
2696             {
2697               strcpy(p, win->w_title);
2698               if (*p)
2699                 qmflag = 1;
2700             }
2701           p += strlen(p) - 1;
2702           break;
2703         case '{':
2704           {
2705             char rbuf[128];
2706             s++;
2707             for (i = 0; i < 127; i++)
2708               if (s[i] && s[i] != '}')
2709                 rbuf[i] = s[i];
2710               else
2711                 break;
2712             if (s[i] == '}' && winmsg_numrend < MAX_WINMSG_REND)
2713               {
2714                 r = -1;
2715                 rbuf[i] = 0;
2716                 debug1("MakeWinMsg attrcolor %s\n", rbuf);
2717                 if (i != 1 || rbuf[0] != '-')
2718                   r = ParseAttrColor(rbuf, (char *)0, 0);
2719                 if (r != -1 || (i == 1 && rbuf[0] == '-'))
2720                   {
2721                     winmsg_rend[winmsg_numrend] = r;
2722                     winmsg_rendpos[winmsg_numrend] = p - winmsg_buf;
2723                     winmsg_numrend++;
2724                   }
2725               }
2726             s += i;
2727             p--;
2728           }
2729           break;
2730         case 'H':
2731           *p = 0;
2732           if ((int)strlen(HostName) < l)
2733             {
2734               strcpy(p, HostName);
2735               if (*p)
2736                 qmflag = 1;
2737             }
2738           p += strlen(p) - 1;
2739           break;
2740         case 'S':
2741           {
2742             char *session_name;
2743             *p = 0;
2744             session_name = strchr(SockName, '.') + 1;
2745             if ((int)strlen(session_name) < l)
2746               {
2747                 strcpy(p, session_name);
2748                 if (*p)
2749                   qmflag = 1;
2750               }
2751             p += strlen(p) - 1;
2752           }
2753           break;
2754         case 'p':
2755           {
2756             sprintf(p, "%d", (plusflg && display) ? D_userpid : getpid());
2757             p += strlen(p) - 1;
2758           }
2759           break;
2760         case 'F':
2761           p--;
2762           /* small hack */
2763           if (display && ((ev && ev == &D_forecv->c_captev) || (!ev && win && win == D_fore)))
2764             minusflg = !minusflg;
2765           if (minusflg)
2766             qmflag = 1;
2767           break;
2768         case '>':
2769           truncpos = p - winmsg_buf;
2770           truncper = num > 100 ? 100 : num;
2771           trunclong = longflg;
2772           p--;
2773           break;
2774         case '=':
2775         case '<':
2776           *p = ' ';
2777           if (num || zeroflg || plusflg || longflg || (*s != '='))
2778             {
2779               /* expand all pads */
2780               if (minusflg)
2781                 {
2782                   num = (plusflg ? lastpad : padlen) - num;
2783                   if (!plusflg && padlen == 0)
2784                     num = p - winmsg_buf;
2785                   plusflg = 0;
2786                 }
2787               else if (!zeroflg)
2788                 {
2789                   if (*s != '=' && num == 0 && !plusflg)
2790                     num = 100;
2791                   if (num > 100)
2792                     num = 100;
2793                   if (padlen == 0)
2794                     num = p - winmsg_buf;
2795                   else
2796                     num = (padlen - (plusflg ? lastpad : 0)) * num / 100;
2797                 }
2798               if (num < 0)
2799                 num = 0;
2800               if (plusflg)
2801                 num += lastpad;
2802               if (num > MAXSTR - 1)
2803                 num = MAXSTR - 1;
2804               if (numpad)
2805                 p = pad_expand(winmsg_buf, p, numpad, num);
2806               numpad = 0;
2807               if (p - winmsg_buf > num && !longflg)
2808                 {
2809                   int left, trunc;
2810
2811                   if (truncpos == -1)
2812                     {
2813                       truncpos = lastpad;
2814                       truncper = 0;
2815                     }
2816                   trunc = lastpad + truncper * (num - lastpad) / 100;
2817                   if (trunc > num)
2818                     trunc = num;
2819                   if (trunc < lastpad)
2820                     trunc = lastpad;
2821                   left = truncpos - trunc;
2822                   if (left > p - winmsg_buf - num)
2823                     left = p - winmsg_buf - num;
2824                   debug1("lastpad = %d, ", lastpad);
2825                   debug3("truncpos = %d, trunc = %d, left = %d\n", truncpos, trunc, left);
2826                   if (left > 0)
2827                     {
2828                       if (left + lastpad > p - winmsg_buf)
2829                         left = p - winmsg_buf - lastpad;
2830                       if (p - winmsg_buf - lastpad - left > 0)
2831                         bcopy(winmsg_buf + lastpad + left, winmsg_buf + lastpad,  p - winmsg_buf - lastpad - left);
2832                       p -= left;
2833                       r = winmsg_numrend;
2834                       while (r && winmsg_rendpos[r - 1] > lastpad)
2835                         {
2836                           r--;
2837                           winmsg_rendpos[r] -= left;
2838                           if (winmsg_rendpos[r] < lastpad)
2839                             winmsg_rendpos[r] = lastpad;
2840                         }
2841                       if (trunclong)
2842                         {
2843                           if (p - winmsg_buf > lastpad)
2844                             winmsg_buf[lastpad] = '.';
2845                           if (p - winmsg_buf > lastpad + 1)
2846                             winmsg_buf[lastpad + 1] = '.';
2847                           if (p - winmsg_buf > lastpad + 2)
2848                             winmsg_buf[lastpad + 2] = '.';
2849                         }
2850                     }
2851                   if (p - winmsg_buf > num)
2852                     {
2853                       p = winmsg_buf + num;
2854                       if (trunclong)
2855                         {
2856                           if (num - 1 >= lastpad)
2857                             p[-1] = '.';
2858                           if (num - 2 >= lastpad)
2859                             p[-2] = '.';
2860                           if (num - 3 >= lastpad)
2861                             p[-3] = '.';
2862                         }
2863                       r = winmsg_numrend;
2864                       while (r && winmsg_rendpos[r - 1] > num)
2865                         winmsg_rendpos[--r] = num;
2866                     }
2867                   truncpos = -1;
2868                   trunclong = 0;
2869                   if (lastpad > p - winmsg_buf)
2870                     lastpad = p - winmsg_buf;
2871                   debug1("lastpad now %d\n", lastpad);
2872                 }
2873               if (*s == '=')
2874                 {
2875                   while (p - winmsg_buf < num)
2876                     *p++ = ' ';
2877                   lastpad = p - winmsg_buf;
2878                   truncpos = -1;
2879                   trunclong = 0;
2880                   debug1("lastpad2 now %d\n", lastpad);
2881                 }
2882               p--;
2883             }
2884           else if (padlen)
2885             {
2886               *p = 127;         /* internal pad representation */
2887               numpad++;
2888             }
2889           break;
2890         case 'n':
2891           s++;
2892           /* FALLTHROUGH */
2893         default:
2894           s--;
2895           if (l > 10 + num)
2896             {
2897               if (num == 0)
2898                 num = 1;
2899               if (!win)
2900                 sprintf(p, "%*s", num, num > 1 ? "--" : "-");
2901               else
2902                 sprintf(p, "%*d", num, win->w_number);
2903               qmflag = 1;
2904               p += strlen(p) - 1;
2905             }
2906           break;
2907         }
2908     }
2909   if (qmpos && !qmflag)
2910     p = qmpos + 1;
2911   *p = '\0';
2912   if (numpad)
2913     {
2914       if (padlen > MAXSTR - 1)
2915         padlen = MAXSTR - 1;
2916       p = pad_expand(winmsg_buf, p, numpad, padlen);
2917     }
2918   if (ev)
2919     {
2920       evdeq(ev);                /* just in case */
2921       ev->timeout.tv_sec = 0;
2922       ev->timeout.tv_usec = 0;
2923     }
2924   if (ev && tick)
2925     {
2926       now.tv_usec = 100000;
2927       if (tick == 1)
2928         now.tv_sec++;
2929       else
2930         now.tv_sec += tick - (now.tv_sec % tick);
2931       ev->timeout = now;
2932       debug2("NEW timeout %d %d\n", ev->timeout.tv_sec, tick);
2933     }
2934   return winmsg_buf;
2935 }
2936
2937 char *
2938 MakeWinMsg(s, win, esc)
2939 char *s;
2940 struct win *win;
2941 int esc;
2942 {
2943   return MakeWinMsgEv(s, win, esc, 0, (struct event *)0, 0);
2944 }
2945
2946 void
2947 PutWinMsg(s, start, max)
2948 char *s;
2949 int start, max;
2950 {
2951   int i, p, l, r, n;
2952   struct mchar rend;
2953   struct mchar rendstack[MAX_WINMSG_REND];
2954   int rendstackn = 0;
2955
2956   if (s != winmsg_buf)
2957     {
2958       /* sorry, no fancy coloring available */
2959       debug1("PutWinMsg %s plain\n", s);
2960       l = strlen(s);
2961       if (l > max)
2962         l = max;
2963       l -= start;
2964       s += start;
2965       while (l-- > 0)
2966         PUTCHARLP(*s++);
2967       return;
2968     }
2969   rend = D_rend;
2970   p = 0;
2971   l = strlen(s);
2972   debug2("PutWinMsg %s start attr %x\n", s, rend.attr);
2973   for (i = 0; i < winmsg_numrend && max > 0; i++)
2974     {
2975       if (p > winmsg_rendpos[i] || winmsg_rendpos[i] > l)
2976         break;
2977       if (p < winmsg_rendpos[i])
2978         {
2979           n = winmsg_rendpos[i] - p;
2980           if (n > max)
2981             n = max;
2982           max -= n;
2983           p += n;
2984           while(n-- > 0)
2985             {
2986               if (start-- > 0)
2987                 s++;
2988               else
2989                 PUTCHARLP(*s++);
2990             }
2991         }
2992       r = winmsg_rend[i];
2993       if (r == -1)
2994         {
2995           if (rendstackn > 0)
2996             rend = rendstack[--rendstackn];
2997         }
2998       else
2999         {
3000           rendstack[rendstackn++] = rend;
3001           ApplyAttrColor(r, &rend);
3002         }
3003       SetRendition(&rend);
3004     }
3005   if (p < l)
3006     {
3007       n = l - p;
3008       if (n > max)
3009         n = max;
3010       while(n-- > 0)
3011         {
3012           if (start-- > 0)
3013             s++;
3014           else
3015             PUTCHARLP(*s++);
3016         }
3017     }
3018 }
3019
3020
3021 #ifdef DEBUG
3022 static void
3023 fds1(i, j)
3024 int i, j;
3025 {
3026   while (i < j)
3027     {
3028       debug1("%d ", i);
3029       i++;
3030     }
3031   if ((j = open("/dev/null", 0)) >= 0)
3032     {
3033       fds1(i + 1, j);
3034       close(j);
3035     }
3036   else
3037     {
3038       while (dup(++i) < 0 && errno != EBADF)
3039         debug1("%d ", i);
3040       debug1(" [%d]\n", i);
3041     }
3042 }
3043
3044 static void
3045 fds()
3046 {
3047   debug("fds: ");
3048   fds1(-1, -1);
3049 }
3050 #endif
3051
3052 static void
3053 serv_read_fn(ev, data)
3054 struct event *ev;
3055 char *data;
3056 {
3057   debug("Knock - knock!\n");
3058   ReceiveMsg();
3059 }
3060
3061 static void
3062 serv_select_fn(ev, data)
3063 struct event *ev;
3064 char *data;
3065 {
3066   struct win *p;
3067
3068   debug("serv_select_fn called\n");
3069   /* XXX: messages?? */
3070   if (GotSigChld)
3071     {
3072       SigChldHandler();
3073     }
3074   if (InterruptPlease)
3075     {
3076       debug("Backend received interrupt\n");
3077       /* This approach is rather questionable in a multi-display
3078        * environment */
3079       if (fore && displays)
3080         {
3081 #if defined(TERMIO) || defined(POSIX)
3082           char ibuf = displays->d_OldMode.tio.c_cc[VINTR];
3083 #else
3084           char ibuf = displays->d_OldMode.m_tchars.t_intrc;
3085 #endif
3086 #ifdef PSEUDOS
3087           write(W_UWP(fore) ? fore->w_pwin->p_ptyfd : fore->w_ptyfd,
3088                 &ibuf, 1);
3089           debug1("Backend wrote interrupt to %d", fore->w_number);
3090           debug1("%s\n", W_UWP(fore) ? " (pseudowin)" : "");
3091 #else
3092           write(fore->w_ptyfd, &ibuf, 1);
3093           debug1("Backend wrote interrupt to %d\n", fore->w_number);
3094 #endif
3095         }
3096       InterruptPlease = 0;
3097     }
3098
3099   for (p = windows; p; p = p->w_next)
3100     {
3101       if (p->w_bell == BELL_FOUND || p->w_bell == BELL_VISUAL)
3102         {
3103           struct canvas *cv;
3104           int visual = p->w_bell == BELL_VISUAL || visual_bell;
3105           p->w_bell = BELL_ON;
3106           for (display = displays; display; display = display->d_next)
3107             {
3108               for (cv = D_cvlist; cv; cv = cv->c_next)
3109                 if (cv->c_layer->l_bottom == &p->w_layer)
3110                   break;
3111               if (cv == 0)
3112                 {
3113                   p->w_bell = BELL_DONE;
3114                   Msg(0, "%s", MakeWinMsg(BellString, p, '%'));
3115                 }
3116               else if (visual && !D_VB && (!D_status || !D_status_bell))
3117                 {
3118                   Msg(0, "%s", VisualBellString);
3119                   if (D_status)
3120                     {
3121                       D_status_bell = 1;
3122                       debug1("using vbell timeout %d\n", VBellWait);
3123                       SetTimeout(&D_statusev, VBellWait );
3124                     }
3125                 }
3126             }
3127           /* don't annoy the user with two messages */
3128           if (p->w_monitor == MON_FOUND)
3129             p->w_monitor = MON_DONE;
3130           WindowChanged(p, 'f');
3131         }
3132       if (p->w_monitor == MON_FOUND)
3133         {
3134           struct canvas *cv;
3135           p->w_monitor = MON_ON;
3136           for (display = displays; display; display = display->d_next)
3137             {
3138               for (cv = D_cvlist; cv; cv = cv->c_next)
3139                 if (cv->c_layer->l_bottom == &p->w_layer)
3140                   break;
3141               if (cv)
3142                 continue;       /* user already sees window */
3143 #ifdef MULTIUSER
3144               if (!(ACLBYTE(p->w_mon_notify, D_user->u_id) & ACLBIT(D_user->u_id)))
3145                 continue;       /* user doesn't care */
3146 #endif
3147               Msg(0, "%s", MakeWinMsg(ActivityString, p, '%'));
3148               p->w_monitor = MON_DONE;
3149             }
3150           WindowChanged(p, 'f');
3151         }
3152     }
3153
3154   for (display = displays; display; display = display->d_next)
3155     {
3156       struct canvas *cv;
3157       if (D_status == STATUS_ON_WIN)
3158         continue;
3159       /* XXX: should use display functions! */
3160       for (cv = D_cvlist; cv; cv = cv->c_next)
3161         {
3162           int lx, ly;
3163
3164           /* normalize window, see resize.c */
3165           lx = cv->c_layer->l_x;
3166           ly = cv->c_layer->l_y;
3167           if (lx == cv->c_layer->l_width)
3168             lx--;
3169           if (ly + cv->c_yoff < cv->c_ys)
3170             {
3171               int i, n = cv->c_ys - (ly + cv->c_yoff);
3172               cv->c_yoff = cv->c_ys - ly;
3173               RethinkViewportOffsets(cv);
3174               if (n > cv->c_layer->l_height)
3175                 n = cv->c_layer->l_height;
3176               CV_CALL(cv,
3177                 LScrollV(flayer, -n, 0, flayer->l_height - 1, 0);
3178                 LayRedisplayLine(-1, -1, -1, 1);
3179                 for (i = 0; i < n; i++)
3180                   LayRedisplayLine(i, 0, flayer->l_width - 1, 1);
3181                 if (cv == cv->c_display->d_forecv)
3182                   LaySetCursor();
3183               );
3184             }
3185           else if (ly + cv->c_yoff > cv->c_ye)
3186             {
3187               int i, n = ly + cv->c_yoff - cv->c_ye;
3188               cv->c_yoff = cv->c_ye - ly;
3189               RethinkViewportOffsets(cv);
3190               if (n > cv->c_layer->l_height)
3191                 n = cv->c_layer->l_height;
3192               CV_CALL(cv,
3193                 LScrollV(flayer, n, 0, cv->c_layer->l_height - 1, 0);
3194                 LayRedisplayLine(-1, -1, -1, 1);
3195                 for (i = 0; i < n; i++)
3196                   LayRedisplayLine(i + flayer->l_height - n, 0, flayer->l_width - 1, 1);
3197                 if (cv == cv->c_display->d_forecv)
3198                   LaySetCursor();
3199               );
3200             }
3201           if (lx + cv->c_xoff < cv->c_xs)
3202             {
3203               int i, n = cv->c_xs - (lx + cv->c_xoff);
3204               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3205                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3206               if (cv->c_xoff + n > cv->c_xs)
3207                 n = cv->c_xs - cv->c_xoff;
3208               cv->c_xoff += n;
3209               RethinkViewportOffsets(cv);
3210               if (n > cv->c_layer->l_width)
3211                 n = cv->c_layer->l_width;
3212               CV_CALL(cv,
3213                 LayRedisplayLine(-1, -1, -1, 1);
3214                 for (i = 0; i < flayer->l_height; i++)
3215                   {
3216                     LScrollH(flayer, -n, i, 0, flayer->l_width - 1, 0, 0);
3217                     LayRedisplayLine(i, 0, n - 1, 1);
3218                   }
3219                 if (cv == cv->c_display->d_forecv)
3220                   LaySetCursor();
3221               );
3222             }
3223           else if (lx + cv->c_xoff > cv->c_xe)
3224             {
3225               int i, n = lx + cv->c_xoff - cv->c_xe;
3226               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3227                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3228               if (cv->c_xoff - n + cv->c_layer->l_width - 1 < cv->c_xe)
3229                 n = cv->c_xoff + cv->c_layer->l_width - 1 - cv->c_xe;
3230               cv->c_xoff -= n;
3231               RethinkViewportOffsets(cv);
3232               if (n > cv->c_layer->l_width)
3233                 n = cv->c_layer->l_width;
3234               CV_CALL(cv,
3235                 LayRedisplayLine(-1, -1, -1, 1);
3236                 for (i = 0; i < flayer->l_height; i++)
3237                   {
3238                     LScrollH(flayer, n, i, 0, flayer->l_width - 1, 0, 0);
3239                     LayRedisplayLine(i, flayer->l_width - n, flayer->l_width - 1, 1);
3240                   }
3241                 if (cv == cv->c_display->d_forecv)
3242                   LaySetCursor();
3243               );
3244             }
3245         }
3246     }
3247
3248   for (display = displays; display; display = display->d_next)
3249     {
3250       if (D_status == STATUS_ON_WIN || D_cvlist == 0 || D_cvlist->c_next == 0)
3251         continue;
3252       debug1("serv_select_fn: Restore on cv %#x\n", (int)D_forecv);
3253       CV_CALL(D_forecv, LayRestore();LaySetCursor());
3254     }
3255 }
3256
3257 static void
3258 logflush_fn(ev, data)
3259 struct event *ev;
3260 char *data;
3261 {
3262   struct win *p;
3263   char *buf;
3264   int n;
3265
3266   if (!islogfile(NULL))
3267     return;             /* no more logfiles */
3268   logfflush(NULL);
3269   n = log_flush ? log_flush : (logtstamp_after + 4) / 5;
3270   if (n)
3271     {
3272       SetTimeout(ev, n * 1000);
3273       evenq(ev);        /* re-enqueue ourself */
3274     }
3275   if (!logtstamp_on)
3276     return;
3277   /* write fancy time-stamp */
3278   for (p = windows; p; p = p->w_next)
3279     {
3280       if (!p->w_log)
3281         continue;
3282       p->w_logsilence += n;
3283       if (p->w_logsilence < logtstamp_after)
3284         continue;
3285       if (p->w_logsilence - n >= logtstamp_after)
3286         continue;
3287       buf = MakeWinMsg(logtstamp_string, p, '%');
3288       logfwrite(p->w_log, buf, strlen(buf));
3289     }
3290 }
3291
3292 /*
3293  * Interprets ^?, ^@ and other ^-control-char notation.
3294  * Interprets \ddd octal notation
3295  *
3296  * The result is placed in *cp, p is advanced behind the parsed expression and
3297  * returned.
3298  */
3299 static char *
3300 ParseChar(p, cp)
3301 char *p, *cp;
3302 {
3303   if (*p == 0)
3304     return 0;
3305   if (*p == '^' && p[1])
3306     {
3307       if (*++p == '?')
3308         *cp = '\177';
3309       else if (*p >= '@')
3310         *cp = Ctrl(*p);
3311       else
3312         return 0;
3313       ++p;
3314     }
3315   else if (*p == '\\' && *++p <= '7' && *p >= '0')
3316     {
3317       *cp = 0;
3318       do
3319         *cp = *cp * 8 + *p - '0';
3320       while (*++p <= '7' && *p >= '0');
3321     }
3322   else
3323     *cp = *p++;
3324   return p;
3325 }
3326
3327 static int
3328 ParseEscape(p)
3329 char *p;
3330 {
3331   unsigned char buf[2];
3332
3333   if (*p == 0)
3334     SetEscape((struct acluser *)0, -1, -1);
3335   else
3336     {
3337       if ((p = ParseChar(p, (char *)buf)) == NULL ||
3338           (p = ParseChar(p, (char *)buf+1)) == NULL || *p)
3339         return -1;
3340       SetEscape((struct acluser *)0, buf[0], buf[1]);
3341     }
3342   return 0;
3343 }
3344