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 #ifdef BSDWAIT
1459   union wait wstat;
1460 #else
1461   int wstat;
1462 #endif
1463 int wstat_valid;
1464 {
1465   int killit = 0;
1466
1467   if (ZombieKey_destroy && ZombieKey_onerror && wstat_valid &&
1468       WIFEXITED(wstat) && WEXITSTATUS(wstat) == 0)
1469         killit = 1;
1470
1471   if (ZombieKey_destroy && !killit)
1472     {
1473       char buf[100], *s, reason[100];
1474       time_t now;
1475
1476       if (wstat_valid) {
1477         if (WIFEXITED(wstat))
1478           if (WEXITSTATUS(wstat))
1479             sprintf(reason, "terminated with exit status %d", WEXITSTATUS(wstat));
1480           else
1481             sprintf(reason, "terminated normally");
1482         else if (WIFSIGNALED(wstat))
1483           sprintf(reason, "terminated with signal %d%s", WTERMSIG(wstat),
1484 #ifdef WCOREDUMP
1485                           WCOREDUMP(wstat) ? " (core file generated)" : "");
1486 #else
1487                           "");
1488 #endif
1489       } else
1490         sprintf(reason, "detached from window");
1491
1492       (void) time(&now);
1493       s = ctime(&now);
1494       if (s && *s)
1495         s[strlen(s) - 1] = '\0';
1496       debug3("window %d (%s) going into zombie state fd %d",
1497              p->w_number, p->w_title, p->w_ptyfd);
1498 #ifdef UTMPOK
1499       if (p->w_slot != (slot_t)0 && p->w_slot != (slot_t)-1)
1500         {
1501           RemoveUtmp(p);
1502           p->w_slot = 0;        /* "detached" */
1503         }
1504 #endif
1505       CloseDevice(p);
1506
1507       p->w_deadpid = p->w_pid;
1508       p->w_pid = 0;
1509       ResetWindow(p);
1510       /* p->w_y = p->w_bot; */
1511       p->w_y = MFindUsedLine(p, p->w_bot, 1);
1512       sprintf(buf, "\n\r=== Command %s (%s) ===", reason, s ? s : "?");
1513       WriteString(p, buf, strlen(buf));
1514       WindowChanged(p, 'f');
1515     }
1516   else
1517     KillWindow(p);
1518 #ifdef UTMPOK
1519   CarefulUtmp();
1520 #endif
1521 }
1522
1523 static void
1524 SigChldHandler()
1525 {
1526   struct stat st;
1527 #ifdef DEBUG
1528   fds();
1529 #endif
1530   while (GotSigChld)
1531     {
1532       GotSigChld = 0;
1533       DoWait();
1534 #ifdef SYSVSIGS
1535       signal(SIGCHLD, SigChld);
1536 #endif
1537     }
1538   if (stat(SockPath, &st) == -1)
1539     {
1540       debug1("SigChldHandler: Yuck! cannot stat '%s'\n", SockPath);
1541       if (!RecoverSocket())
1542         {
1543           debug("SCREEN cannot recover from corrupt Socket, bye\n");
1544           Finit(1);
1545         }
1546       else
1547         debug1("'%s' reconstructed\n", SockPath);
1548     }
1549   else
1550     debug2("SigChldHandler: stat '%s' o.k. (%03o)\n", SockPath, (int)st.st_mode);
1551 }
1552
1553 static sigret_t
1554 SigChld SIGDEFARG
1555 {
1556   debug("SigChld()\n");
1557   GotSigChld = 1;
1558   SIGRETURN;
1559 }
1560
1561 sigret_t
1562 SigHup SIGDEFARG
1563 {
1564   /* Hangup all displays */
1565   while ((display = displays) != 0)
1566     Hangup();
1567   SIGRETURN;
1568 }
1569
1570 /*
1571  * the backend's Interrupt handler
1572  * we cannot insert the intrc directly, as we never know
1573  * if fore is valid.
1574  */
1575 static sigret_t
1576 SigInt SIGDEFARG
1577 {
1578 #if HAZARDOUS
1579   char ibuf;
1580
1581   debug("SigInt()\n");
1582   if (fore && displays)
1583     {
1584 # if defined(TERMIO) || defined(POSIX)
1585       ibuf = displays->d_OldMode.tio.c_cc[VINTR];
1586 # else
1587       ibuf = displays->d_OldMode.m_tchars.t_intrc;
1588 # endif
1589       fore->w_inlen = 0;
1590       write(fore->w_ptyfd, &ibuf, 1);
1591     }
1592 #else
1593   signal(SIGINT, SigInt);
1594   debug("SigInt() careful\n");
1595   InterruptPlease = 1;
1596 #endif
1597   SIGRETURN;
1598 }
1599
1600 static sigret_t
1601 CoreDump SIGDEFARG
1602 {
1603   struct display *disp;
1604   char buf[80];
1605
1606 #if defined(SYSVSIGS) && defined(SIGHASARG)
1607   signal(sigsig, SIG_IGN);
1608 #endif
1609   setgid(getgid());
1610   setuid(getuid());
1611   unlink("core");
1612 #ifdef SIGHASARG
1613   sprintf(buf, "\r\n[screen caught signal %d.%s]\r\n", sigsig,
1614 #else
1615   sprintf(buf, "\r\n[screen caught a fatal signal.%s]\r\n",
1616 #endif
1617 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1618               ""
1619 #else /* SHADOWPW  && !DEBUG */
1620               " (core dumped)"
1621 #endif /* SHADOWPW  && !DEBUG */
1622               );
1623   for (disp = displays; disp; disp = disp->d_next)
1624     {
1625       fcntl(disp->d_userfd, F_SETFL, 0);
1626       SetTTY(disp->d_userfd, &D_OldMode);
1627       write(disp->d_userfd, buf, strlen(buf));
1628       Kill(disp->d_userpid, SIG_BYE);
1629     }
1630 #if defined(SHADOWPW) && !defined(DEBUG) && !defined(DUMPSHADOW)
1631   Kill(getpid(), SIGKILL);
1632   eexit(11);
1633 #else /* SHADOWPW && !DEBUG */
1634   abort();
1635 #endif /* SHADOWPW  && !DEBUG */
1636   SIGRETURN;
1637 }
1638
1639 static void
1640 DoWait()
1641 {
1642   register int pid;
1643   struct win *p, *next;
1644 #ifdef BSDWAIT
1645   union wait wstat;
1646 #else
1647   int wstat;
1648 #endif
1649
1650 #ifdef BSDJOBS
1651 # ifndef BSDWAIT
1652   while ((pid = waitpid(-1, &wstat, WNOHANG | WUNTRACED)) > 0)
1653 # else
1654 # ifdef USE_WAIT2
1655   /*
1656    * From: rouilj@sni-usa.com (John Rouillard)
1657    * note that WUNTRACED is not documented to work, but it is defined in
1658    * /usr/include/sys/wait.h, so it may work
1659    */
1660   while ((pid = wait2(&wstat, WNOHANG | WUNTRACED )) > 0)
1661 #  else /* USE_WAIT2 */
1662   while ((pid = wait3(&wstat, WNOHANG | WUNTRACED, (struct rusage *) 0)) > 0)
1663 #  endif /* USE_WAIT2 */
1664 # endif
1665 #else   /* BSDJOBS */
1666   while ((pid = wait(&wstat)) < 0)
1667     if (errno != EINTR)
1668       break;
1669   if (pid > 0)
1670 #endif  /* BSDJOBS */
1671     {
1672       for (p = windows; p; p = next)
1673         {
1674           next = p->w_next;
1675           if (  (p->w_pid     && pid == p->w_pid) ||
1676                 (p->w_deadpid && pid == p->w_deadpid) )
1677             {
1678               /* child has ceased to exist */
1679               p->w_pid = 0;
1680
1681 #ifdef BSDJOBS
1682               if (WIFSTOPPED(wstat))
1683                 {
1684                   debug3("Window %d pid %d: WIFSTOPPED (sig %d)\n", p->w_number, pid, WSTOPSIG(wstat));
1685 #ifdef SIGTTIN
1686                   if (WSTOPSIG(wstat) == SIGTTIN)
1687                     {
1688                       Msg(0, "Suspended (tty input)");
1689                       continue;
1690                     }
1691 #endif
1692 #ifdef SIGTTOU
1693                   if (WSTOPSIG(wstat) == SIGTTOU)
1694                     {
1695                       Msg(0, "Suspended (tty output)");
1696                       continue;
1697                     }
1698 #endif
1699                   /* Try to restart process */
1700                   Msg(0, "Child has been stopped, restarting.");
1701                   if (killpg(pid, SIGCONT))
1702                     kill(pid, SIGCONT);
1703                 }
1704               else
1705 #endif
1706                 {
1707                   WindowDied(p, wstat, 1);
1708                 }
1709               break;
1710             }
1711 #ifdef PSEUDOS
1712           if (p->w_pwin && pid == p->w_pwin->p_pid)
1713             {
1714               debug2("pseudo of win Nr %d died. pid == %d\n", p->w_number, p->w_pwin->p_pid);
1715               FreePseudowin(p);
1716               break;
1717             }
1718 #endif
1719         }
1720       if (p == 0)
1721         {
1722           debug1("pid %d not found - hope that's ok\n", pid);
1723         }
1724     }
1725 }
1726
1727
1728 static sigret_t
1729 FinitHandler SIGDEFARG
1730 {
1731 #ifdef SIGHASARG
1732   debug1("FinitHandler called, sig %d.\n", sigsig);
1733 #else
1734   debug("FinitHandler called.\n");
1735 #endif
1736   Finit(1);
1737   SIGRETURN;
1738 }
1739
1740 void
1741 Finit(i)
1742 int i;
1743 {
1744   signal(SIGCHLD, SIG_DFL);
1745   signal(SIGHUP, SIG_IGN);
1746   debug1("Finit(%d);\n", i);
1747   while (windows)
1748     {
1749       struct win *p = windows;
1750       windows = windows->w_next;
1751       FreeWindow(p);
1752     }
1753   if (ServerSocket != -1)
1754     {
1755       debug1("we unlink(%s)\n", SockPath);
1756 #ifdef USE_SETEUID
1757       xseteuid(real_uid);
1758       xsetegid(real_gid);
1759 #endif
1760       (void) unlink(SockPath);
1761 #ifdef USE_SETEUID
1762       xseteuid(eff_uid);
1763       xsetegid(eff_gid);
1764 #endif
1765     }
1766   for (display = displays; display; display = display->d_next)
1767     {
1768       if (D_status)
1769         RemoveStatus();
1770       FinitTerm();
1771 #ifdef UTMPOK
1772       RestoreLoginSlot();
1773 #endif
1774       AddStr("[screen is terminating]\r\n");
1775       Flush();
1776       SetTTY(D_userfd, &D_OldMode);
1777       fcntl(D_userfd, F_SETFL, 0);
1778       freetty();
1779       Kill(D_userpid, SIG_BYE);
1780     }
1781   /*
1782    * we _cannot_ call eexit(i) here,
1783    * instead of playing with the Socket above. Sigh.
1784    */
1785   exit(i);
1786 }
1787
1788 void
1789 eexit(e)
1790 int e;
1791 {
1792   debug("eexit\n");
1793   if (ServerSocket != -1)
1794     {
1795       debug1("we unlink(%s)\n", SockPath);
1796       setgid(real_gid);
1797       setuid(real_uid);
1798       (void) unlink(SockPath);
1799     }
1800   exit(e);
1801 }
1802
1803 void
1804 Hangup()
1805 {
1806   if (display == 0)
1807     return;
1808   debug1("Hangup %x\n", display);
1809   if (D_userfd >= 0)
1810     {
1811       close(D_userfd);
1812       D_userfd = -1;
1813     }
1814   if (auto_detach || displays->d_next)
1815     Detach(D_HANGUP);
1816   else
1817     Finit(0);
1818 }
1819
1820 /*
1821  * Detach now has the following modes:
1822  *D_DETACH       SIG_BYE        detach backend and exit attacher
1823  *D_HANGUP       SIG_BYE        detach backend and exit attacher
1824  *D_STOP         SIG_STOP       stop attacher (and detach backend)
1825  *D_REMOTE       SIG_BYE        remote detach -- reattach to new attacher
1826  *D_POWER        SIG_POWER_BYE  power detach -- attacher kills his parent
1827  *D_REMOTE_POWER SIG_POWER_BYE  remote power detach -- both
1828  *D_LOCK         SIG_LOCK       lock the attacher
1829  * (jw)
1830  * we always remove our utmp slots. (even when "lock" or "stop")
1831  * Note: Take extra care here, we may be called by interrupt!
1832  */
1833 void
1834 Detach(mode)
1835 int mode;
1836 {
1837   int sign = 0, pid;
1838   struct canvas *cv;
1839   struct win *p;
1840
1841   if (display == 0)
1842     return;
1843
1844 #define AddStrSock(msg) do { \
1845     if (SockName) \
1846       { \
1847         AddStr("[" msg " from "); \
1848         AddStr(SockName); \
1849         AddStr("]\r\n"); \
1850       } \
1851     else \
1852       AddStr("[" msg "]\r\n"); \
1853   } while (0)
1854
1855   signal(SIGHUP, SIG_IGN);
1856   debug1("Detach(%d)\n", mode);
1857   if (D_status)
1858     RemoveStatus();
1859   FinitTerm();
1860   if (!display)
1861     return;
1862   switch (mode)
1863     {
1864     case D_HANGUP:
1865       sign = SIG_BYE;
1866       break;
1867     case D_DETACH:
1868       AddStrSock("detached");
1869       sign = SIG_BYE;
1870       break;
1871 #ifdef BSDJOBS
1872     case D_STOP:
1873       sign = SIG_STOP;
1874       break;
1875 #endif
1876 #ifdef REMOTE_DETACH
1877     case D_REMOTE:
1878       AddStrSock("remote detached");
1879       sign = SIG_BYE;
1880       break;
1881 #endif
1882 #ifdef POW_DETACH
1883     case D_POWER:
1884       AddStrSock("power detached");
1885       if (PowDetachString)
1886         {
1887           AddStr(PowDetachString);
1888           AddStr("\r\n");
1889         }
1890       sign = SIG_POWER_BYE;
1891       break;
1892 #ifdef REMOTE_DETACH
1893     case D_REMOTE_POWER:
1894       AddStrSock("remote power detached");
1895       if (PowDetachString)
1896         {
1897           AddStr(PowDetachString);
1898           AddStr("\r\n");
1899         }
1900       sign = SIG_POWER_BYE;
1901       break;
1902 #endif
1903 #endif
1904     case D_LOCK:
1905       ClearAll();
1906       sign = SIG_LOCK;
1907       /* tell attacher to lock terminal with a lockprg. */
1908       break;
1909     }
1910 #ifdef UTMPOK
1911   if (displays->d_next == 0)
1912     {
1913       for (p = windows; p; p = p->w_next)
1914         {
1915           if (p->w_slot != (slot_t) -1 && !(p->w_lflag & 2))
1916             {
1917               RemoveUtmp(p);
1918               /*
1919                * Set the slot to 0 to get the window
1920                * logged in again.
1921                */
1922               p->w_slot = (slot_t) 0;
1923             }
1924         }
1925     }
1926   if (mode != D_HANGUP)
1927     RestoreLoginSlot();
1928 #endif
1929   if (displays->d_next == 0 && console_window)
1930     {
1931       if (TtyGrabConsole(console_window->w_ptyfd, 0, "detach"))
1932         {
1933           debug("could not release console - killing window\n");
1934           KillWindow(console_window);
1935           display = displays;           /* restore display */
1936         }
1937     }
1938   if (D_fore)
1939     {
1940 #ifdef MULTIUSER
1941       ReleaseAutoWritelock(display, D_fore);
1942 #endif
1943       D_user->u_detachwin = D_fore->w_number;
1944       D_user->u_detachotherwin = D_other ? D_other->w_number : -1;
1945     }
1946   AutosaveLayout(D_layout);
1947   layout_last = D_layout;
1948   for (cv = D_cvlist; cv; cv = cv->c_next)
1949     {
1950       p = Layer2Window(cv->c_layer);
1951       SetCanvasWindow(cv, 0);
1952       if (p)
1953         WindowChanged(p, 'u');
1954     }
1955
1956   pid = D_userpid;
1957   debug2("display: %#x displays: %#x\n", (unsigned int)display, (unsigned int)displays);
1958   FreeDisplay();
1959   if (displays == 0)
1960     /* Flag detached-ness */
1961     (void) chsock();
1962   /*
1963    * tell father what to do. We do that after we
1964    * freed the tty, thus getty feels more comfortable on hpux
1965    * if it was a power detach.
1966    */
1967   Kill(pid, sign);
1968   debug2("Detach: Signal %d to Attacher(%d)!\n", sign, pid);
1969   debug("Detach returns, we are successfully detached.\n");
1970   signal(SIGHUP, SigHup);
1971 #undef AddStrSock
1972 }
1973
1974 static int
1975 IsSymbol(e, s)
1976 char *e, *s;
1977 {
1978   register int l;
1979
1980   l = strlen(s);
1981   return strncmp(e, s, l) == 0 && e[l] == '=';
1982 }
1983
1984 void
1985 MakeNewEnv()
1986 {
1987   register char **op, **np;
1988   static char stybuf[MAXSTR];
1989
1990   for (op = environ; *op; ++op)
1991     ;
1992   if (NewEnv)
1993     free((char *)NewEnv);
1994   NewEnv = np = (char **) malloc((unsigned) (op - environ + 7 + 1) * sizeof(char **));
1995   if (!NewEnv)
1996     Panic(0, strnomem);
1997   sprintf(stybuf, "STY=%s", strlen(SockName) <= MAXSTR - 5 ? SockName : "?");
1998   *np++ = stybuf;                       /* NewEnv[0] */
1999   *np++ = Term;                 /* NewEnv[1] */
2000   np++;         /* room for SHELL */
2001 #ifdef TIOCSWINSZ
2002   np += 2;      /* room for TERMCAP and WINDOW */
2003 #else
2004   np += 4;      /* room for TERMCAP WINDOW LINES COLUMNS */
2005 #endif
2006
2007   for (op = environ; *op; ++op)
2008     {
2009       if (!IsSymbol(*op, "TERM") && !IsSymbol(*op, "TERMCAP")
2010           && !IsSymbol(*op, "STY") && !IsSymbol(*op, "WINDOW")
2011           && !IsSymbol(*op, "SCREENCAP") && !IsSymbol(*op, "SHELL")
2012           && !IsSymbol(*op, "LINES") && !IsSymbol(*op, "COLUMNS")
2013          )
2014         *np++ = *op;
2015     }
2016   *np = 0;
2017 }
2018
2019 void
2020 /*VARARGS2*/
2021 #if defined(USEVARARGS) && defined(__STDC__)
2022 Msg(int err, char *fmt, VA_DOTS)
2023 #else
2024 Msg(err, fmt, VA_DOTS)
2025 int err;
2026 char *fmt;
2027 VA_DECL
2028 #endif
2029 {
2030   VA_LIST(ap)
2031   char buf[MAXPATHLEN*2];
2032   char *p = buf;
2033
2034   VA_START(ap, fmt);
2035   fmt = DoNLS(fmt);
2036   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
2037   VA_END(ap);
2038   if (err)
2039     {
2040       p += strlen(p);
2041       *p++ = ':';
2042       *p++ = ' ';
2043       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
2044       buf[sizeof(buf) - 1] = 0;
2045     }
2046   debug2("Msg('%s') (%#x);\n", buf, (unsigned int)display);
2047
2048   if (display && displays)
2049     MakeStatus(buf);
2050   else if (displays)
2051     {
2052       for (display = displays; display; display = display->d_next)
2053         MakeStatus(buf);
2054     }
2055   else if (display)
2056     {
2057       /* no displays but a display - must have forked.
2058        * send message to backend!
2059        */
2060       char *tty = D_usertty;
2061       struct display *olddisplay = display;
2062       display = 0;      /* only send once */
2063       SendErrorMsg(tty, buf);
2064       display = olddisplay;
2065     }
2066   else
2067     printf("%s\r\n", buf);
2068 }
2069
2070 /*
2071  * Call FinitTerm for all displays, write a message to each and call eexit();
2072  */
2073 void
2074 /*VARARGS2*/
2075 #if defined(USEVARARGS) && defined(__STDC__)
2076 Panic(int err, char *fmt, VA_DOTS)
2077 #else
2078 Panic(err, fmt, VA_DOTS)
2079 int err;
2080 char *fmt;
2081 VA_DECL
2082 #endif
2083 {
2084   VA_LIST(ap)
2085   char buf[MAXPATHLEN*2];
2086   char *p = buf;
2087
2088   VA_START(ap, fmt);
2089   fmt = DoNLS(fmt);
2090   (void)vsnprintf(p, sizeof(buf) - 100, fmt, VA_ARGS(ap));
2091   VA_END(ap);
2092   if (err)
2093     {
2094       p += strlen(p);
2095       *p++ = ':';
2096       *p++ = ' ';
2097       strncpy(p, strerror(err), buf + sizeof(buf) - p - 1);
2098       buf[sizeof(buf) - 1] = 0;
2099     }
2100   debug3("Panic('%s'); display=%x displays=%x\n", buf, display, displays);
2101   if (displays == 0 && display == 0)
2102     {
2103       printf("%s\r\n", buf);
2104       if (PanicPid)
2105         Kill(PanicPid, SIG_BYE);
2106     }
2107   else if (displays == 0)
2108     {
2109       /* no displays but a display - must have forked.
2110        * send message to backend!
2111        */
2112       char *tty = D_usertty;
2113       display = 0;
2114       SendErrorMsg(tty, buf);
2115       sleep(2);
2116       _exit(1);
2117     }
2118   else
2119     for (display = displays; display; display = display->d_next)
2120       {
2121         if (D_status)
2122           RemoveStatus();
2123         FinitTerm();
2124         Flush();
2125 #ifdef UTMPOK
2126         RestoreLoginSlot();
2127 #endif
2128         SetTTY(D_userfd, &D_OldMode);
2129         fcntl(D_userfd, F_SETFL, 0);
2130         write(D_userfd, buf, strlen(buf));
2131         write(D_userfd, "\n", 1);
2132         freetty();
2133         if (D_userpid)
2134           Kill(D_userpid, SIG_BYE);
2135       }
2136 #ifdef MULTIUSER
2137   if (tty_oldmode >= 0)
2138     {
2139 # ifdef USE_SETEUID
2140       if (setuid(own_uid))
2141         xseteuid(own_uid);      /* may be a loop. sigh. */
2142 # else
2143       setuid(own_uid);
2144 # endif
2145       debug1("Panic: changing back modes from %s\n", attach_tty);
2146       chmod(attach_tty, tty_oldmode);
2147     }
2148 #endif
2149   eexit(1);
2150 }
2151
2152
2153 /*
2154  * '^' is allowed as an escape mechanism for control characters. jw.
2155  *
2156  * Added time insertion using ideas/code from /\ndy Jones
2157  *   (andy@lingua.cltr.uq.OZ.AU) - thanks a lot!
2158  *
2159  */
2160
2161 #ifndef USE_LOCALE
2162 static const char days[]   = "SunMonTueWedThuFriSat";
2163 static const char months[] = "JanFebMarAprMayJunJulAugSepOctNovDec";
2164 #endif
2165
2166 static char winmsg_buf[MAXSTR];
2167 #define MAX_WINMSG_REND 16      /* rendition changes */
2168 static int winmsg_rend[MAX_WINMSG_REND];
2169 static int winmsg_rendpos[MAX_WINMSG_REND];
2170 static int winmsg_numrend;
2171
2172 static char *
2173 pad_expand(buf, p, numpad, padlen)
2174 char *buf;
2175 char *p;
2176 int numpad;
2177 int padlen;
2178 {
2179   char *pn, *pn2;
2180   int i, r;
2181
2182   padlen = padlen - (p - buf);  /* space for rent */
2183   if (padlen < 0)
2184     padlen = 0;
2185   pn2 = pn = p + padlen;
2186   r = winmsg_numrend;
2187   while (p >= buf)
2188     {
2189       if (r && *p != 127 && p - buf == winmsg_rendpos[r - 1])
2190         {
2191           winmsg_rendpos[--r] = pn - buf;
2192           continue;
2193         }
2194       *pn-- = *p;
2195       if (*p-- == 127)
2196         {
2197           pn[1] = ' ';
2198           i = numpad > 0 ? (padlen + numpad - 1) / numpad : 0;
2199           padlen -= i;
2200           while (i-- > 0)
2201             *pn-- = ' ';
2202           numpad--;
2203           if (r && p - buf == winmsg_rendpos[r - 1])
2204             winmsg_rendpos[--r] = pn - buf;
2205         }
2206     }
2207   return pn2;
2208 }
2209
2210 struct backtick {
2211   struct backtick *next;
2212   int num;
2213   int tick;
2214   int lifespan;
2215   time_t bestbefore;
2216   char result[MAXSTR];
2217   char **cmdv;
2218   struct event ev;
2219   char *buf;
2220   int bufi;
2221 };
2222
2223 struct backtick *backticks;
2224
2225 static void
2226 backtick_filter(bt)
2227 struct backtick *bt;
2228 {
2229   char *p, *q;
2230   int c;
2231
2232   for (p = q = bt->result; (c = (unsigned char)*p++) != 0;)
2233     {
2234       if (c == '\t')
2235         c = ' ';
2236       if (c >= ' ' || c == '\005')
2237         *q++ = c;
2238     }
2239   *q = 0;
2240 }
2241
2242 static void
2243 backtick_fn(ev, data)
2244 struct event *ev;
2245 char *data;
2246 {
2247   struct backtick *bt;
2248   int i, j, k, l;
2249
2250   bt = (struct backtick *)data;
2251   debug1("backtick_fn for #%d\n", bt->num);
2252   i = bt->bufi;
2253   l = read(ev->fd, bt->buf + i, MAXSTR - i);
2254   if (l <= 0)
2255     {
2256       debug1("EOF on backtick #%d\n", bt->num);
2257       evdeq(ev);
2258       close(ev->fd);
2259       ev->fd = -1;
2260       return;
2261     }
2262   debug1("read %d bytes\n", l);
2263   i += l;
2264   for (j = 0; j < l; j++)
2265     if (bt->buf[i - j - 1] == '\n')
2266       break;
2267   if (j < l)
2268     {
2269       for (k = i - j - 2; k >= 0; k--)
2270         if (bt->buf[k] == '\n')
2271           break;
2272       k++;
2273       bcopy(bt->buf + k, bt->result, i - j - k);
2274       bt->result[i - j - k - 1] = 0;
2275       backtick_filter(bt);
2276       WindowChanged(0, '`');
2277     }
2278   if (j == l && i == MAXSTR)
2279     {
2280       j = MAXSTR/2;
2281       l = j + 1;
2282     }
2283   if (j < l)
2284     {
2285       if (j)
2286         bcopy(bt->buf + i - j, bt->buf, j);
2287       i = j;
2288     }
2289   bt->bufi = i;
2290 }
2291
2292 void
2293 setbacktick(num, lifespan, tick, cmdv)
2294 int num;
2295 int lifespan;
2296 int tick;
2297 char **cmdv;
2298 {
2299   struct backtick **btp, *bt;
2300   char **v;
2301
2302   debug1("setbacktick called for backtick #%d\n", num);
2303   for (btp = &backticks; (bt = *btp) != 0; btp = &bt->next)
2304     if (bt->num == num)
2305       break;
2306   if (!bt && !cmdv)
2307     return;
2308   if (bt)
2309     {
2310       for (v = bt->cmdv; *v; v++)
2311         free(*v);
2312       free(bt->cmdv);
2313       if (bt->buf)
2314         free(bt->buf);
2315       if (bt->ev.fd >= 0)
2316         close(bt->ev.fd);
2317       evdeq(&bt->ev);
2318     }
2319   if (bt && !cmdv)
2320     {
2321       *btp = bt->next;
2322       free(bt);
2323       return;
2324     }
2325   if (!bt)
2326     {
2327       bt = (struct backtick *)malloc(sizeof *bt);
2328       if (!bt)
2329         {
2330           Msg(0, strnomem);
2331           return;
2332         }
2333       bzero(bt, sizeof(*bt));
2334       bt->next = 0;
2335       *btp = bt;
2336     }
2337   bt->num = num;
2338   bt->tick = tick;
2339   bt->lifespan = lifespan;
2340   bt->bestbefore = 0;
2341   bt->result[0] = 0;
2342   bt->buf = 0;
2343   bt->bufi = 0;
2344   bt->cmdv = cmdv;
2345   bt->ev.fd = -1;
2346   if (bt->tick == 0 && bt->lifespan == 0)
2347     {
2348       debug("setbacktick: continuous mode\n");
2349       bt->buf = (char *)malloc(MAXSTR);
2350       if (bt->buf == 0)
2351         {
2352           Msg(0, strnomem);
2353           setbacktick(num, 0, 0, (char **)0);
2354           return;
2355         }
2356       bt->ev.type = EV_READ;
2357       bt->ev.fd = readpipe(bt->cmdv);
2358       bt->ev.handler = backtick_fn;
2359       bt->ev.data = (char *)bt;
2360       if (bt->ev.fd >= 0)
2361         evenq(&bt->ev);
2362     }
2363 }
2364
2365 static char *
2366 runbacktick(bt, tickp, now)
2367 struct backtick *bt;
2368 int *tickp;
2369 time_t now;
2370 {
2371   int f, i, l, j;
2372   time_t now2;
2373
2374   debug1("runbacktick called for backtick #%d\n", bt->num);
2375   if (bt->tick && (!*tickp || bt->tick < *tickp))
2376     *tickp = bt->tick;
2377   if ((bt->lifespan == 0 && bt->tick == 0) || now < bt->bestbefore)
2378     {
2379       debug1("returning old result (%d)\n", bt->lifespan);
2380       return bt->result;
2381     }
2382   f = readpipe(bt->cmdv);
2383   if (f == -1)
2384     return bt->result;
2385   i = 0;
2386   while ((l = read(f, bt->result + i, sizeof(bt->result) - i)) > 0)
2387     {
2388       debug1("runbacktick: read %d bytes\n", l);
2389       i += l;
2390       for (j = 1; j < l; j++)
2391         if (bt->result[i - j - 1] == '\n')
2392           break;
2393       if (j == l && i == sizeof(bt->result))
2394         {
2395           j = sizeof(bt->result) / 2;
2396           l = j + 1;
2397         }
2398       if (j < l)
2399         {
2400           bcopy(bt->result + i - j, bt->result, j);
2401           i = j;
2402         }
2403     }
2404   close(f);
2405   bt->result[sizeof(bt->result) - 1] = '\n';
2406   if (i && bt->result[i - 1] == '\n')
2407     i--;
2408   debug1("runbacktick: finished, %d bytes\n", i);
2409   bt->result[i] = 0;
2410   backtick_filter(bt);
2411   (void)time(&now2);
2412   bt->bestbefore = now2 + bt->lifespan;
2413   return bt->result;
2414 }
2415
2416 char *
2417 MakeWinMsgEv(str, win, esc, padlen, ev, rec)
2418 char *str;
2419 struct win *win;
2420 int esc;
2421 int padlen;
2422 struct event *ev;
2423 int rec;
2424 {
2425   static int tick;
2426   char *s = str;
2427   register char *p = winmsg_buf;
2428   register int ctrl;
2429   struct timeval now;
2430   struct tm *tm;
2431   int l, i, r;
2432   int num;
2433   int zeroflg;
2434   int longflg;
2435   int minusflg;
2436   int plusflg;
2437   int qmflag = 0, omflag = 0, qmnumrend = 0;
2438   char *qmpos = 0;
2439   int numpad = 0;
2440   int lastpad = 0;
2441   int truncpos = -1;
2442   int truncper = 0;
2443   int trunclong = 0;
2444   struct backtick *bt;
2445
2446   if (winmsg_numrend >= 0)
2447     winmsg_numrend = 0;
2448   else
2449     winmsg_numrend = -winmsg_numrend;
2450
2451   tick = 0;
2452   tm = 0;
2453   ctrl = 0;
2454   gettimeofday(&now, NULL);
2455   for (; *s && (l = winmsg_buf + MAXSTR - 1 - p) > 0; s++, p++)
2456     {
2457       *p = *s;
2458       if (ctrl)
2459         {
2460           ctrl = 0;
2461           if (*s != '^' && *s >= 64)
2462             *p &= 0x1f;
2463           continue;
2464         }
2465       if (*s != esc)
2466         {
2467           if (esc == '%')
2468             {
2469               switch (*s)
2470                 {
2471 #if 0
2472                 case '~':
2473                   *p = BELL;
2474                   break;
2475 #endif
2476                 case '^':
2477                   ctrl = 1;
2478                   *p-- = '^';
2479                   break;
2480                 default:
2481                   break;
2482                 }
2483             }
2484           continue;
2485         }
2486       if (*++s == esc)  /* double escape ? */
2487         continue;
2488       if ((plusflg = *s == '+') != 0)
2489         s++;
2490       if ((minusflg = *s == '-') != 0)
2491         s++;
2492       if ((zeroflg = *s == '0') != 0)
2493         s++;
2494       num = 0;
2495       while(*s >= '0' && *s <= '9')
2496         num = num * 10 + (*s++ - '0');
2497       if ((longflg = *s == 'L') != 0)
2498         s++;
2499       switch (*s)
2500         {
2501         case '?':
2502           p--;
2503           if (qmpos)
2504             {
2505               if ((!qmflag && !omflag) || omflag == 1)
2506                 {
2507                   p = qmpos;
2508                   if (qmnumrend < winmsg_numrend)
2509                     winmsg_numrend = qmnumrend;
2510                 }
2511               qmpos = 0;
2512               break;
2513             }
2514           qmpos = p;
2515           qmnumrend = winmsg_numrend;
2516           qmflag = omflag = 0;
2517           break;
2518         case ':':
2519           p--;
2520           if (!qmpos)
2521             break;
2522           if (qmflag && omflag != 1)
2523             {
2524               omflag = 1;
2525               qmpos = p;
2526               qmnumrend = winmsg_numrend;
2527             }
2528           else
2529             {
2530               p = qmpos;
2531               if (qmnumrend < winmsg_numrend)
2532                 winmsg_numrend = qmnumrend;
2533               omflag = -1;
2534             }
2535           break;
2536         case 'd': case 'D': case 'm': case 'M': case 'y': case 'Y':
2537         case 'a': case 'A': case 's': case 'c': case 'C':
2538           if (l < 4)
2539             break;
2540           if (tm == 0)
2541             {
2542               time_t nowsec = now.tv_sec;
2543               tm = localtime(&nowsec);
2544             }
2545           qmflag = 1;
2546           if (!tick || tick > 3600)
2547             tick = 3600;
2548           switch (*s)
2549             {
2550             case 'd':
2551               sprintf(p, "%02d", tm->tm_mday % 100);
2552               break;
2553             case 'D':
2554 #ifdef USE_LOCALE
2555               strftime(p, l, (longflg ? "%A" : "%a"), tm);
2556 #else
2557               sprintf(p, "%3.3s", days + 3 * tm->tm_wday);
2558 #endif
2559               break;
2560             case 'm':
2561               sprintf(p, "%02d", tm->tm_mon + 1);
2562               break;
2563             case 'M':
2564 #ifdef USE_LOCALE
2565               strftime(p, l, (longflg ? "%B" : "%b"), tm);
2566 #else
2567               sprintf(p, "%3.3s", months + 3 * tm->tm_mon);
2568 #endif
2569               break;
2570             case 'y':
2571               sprintf(p, "%02d", tm->tm_year % 100);
2572               break;
2573             case 'Y':
2574               sprintf(p, "%04d", tm->tm_year + 1900);
2575               break;
2576             case 'a':
2577               sprintf(p, tm->tm_hour >= 12 ? "pm" : "am");
2578               break;
2579             case 'A':
2580               sprintf(p, tm->tm_hour >= 12 ? "PM" : "AM");
2581               break;
2582             case 's':
2583               sprintf(p, "%02d", tm->tm_sec);
2584               tick = 1;
2585               break;
2586             case 'c':
2587               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", tm->tm_hour, tm->tm_min);
2588               if (!tick || tick > 60)
2589                 tick = 60;
2590               break;
2591             case 'C':
2592               sprintf(p, zeroflg ? "%02d:%02d" : "%2d:%02d", (tm->tm_hour + 11) % 12 + 1, tm->tm_min);
2593               if (!tick || tick > 60)
2594                 tick = 60;
2595               break;
2596             default:
2597               break;
2598             }
2599           p += strlen(p) - 1;
2600           break;
2601         case 'l':
2602 #ifdef LOADAV
2603           *p = 0;
2604           if (l > 20)
2605             AddLoadav(p);
2606           if (*p)
2607             {
2608               qmflag = 1;
2609               p += strlen(p) - 1;
2610             }
2611           else
2612             *p = '?';
2613           if (!tick || tick > 60)
2614             tick = 60;
2615 #else
2616           *p = '?';
2617 #endif
2618           p += strlen(p) - 1;
2619           break;
2620         case '`':
2621         case 'h':
2622           if (rec >= 10 || (*s == 'h' && (win == 0 || win->w_hstatus == 0 || *win->w_hstatus == 0)))
2623             {
2624               p--;
2625               break;
2626             }
2627           if (*s == '`')
2628             {
2629               for (bt = backticks; bt; bt = bt->next)
2630                 if (bt->num == num)
2631                   break;
2632               if (bt == 0)
2633                 {
2634                   p--;
2635                   break;
2636                 }
2637             }
2638             {
2639               char savebuf[sizeof(winmsg_buf)];
2640               int oldtick = tick;
2641               int oldnumrend = winmsg_numrend;
2642
2643               *p = 0;
2644               strcpy(savebuf, winmsg_buf);
2645               winmsg_numrend = -winmsg_numrend;
2646               MakeWinMsgEv(*s == 'h' ? win->w_hstatus : runbacktick(bt, &oldtick, now.tv_sec), win, '\005', 0, (struct event *)0, rec + 1);
2647               debug2("oldtick=%d tick=%d\n", oldtick, tick);
2648               if (!tick || oldtick < tick)
2649                 tick = oldtick;
2650               if ((int)strlen(winmsg_buf) < l)
2651                 strcat(savebuf, winmsg_buf);
2652               strcpy(winmsg_buf, savebuf);
2653               while (oldnumrend < winmsg_numrend)
2654                 winmsg_rendpos[oldnumrend++] += p - winmsg_buf;
2655               if (*p)
2656                 qmflag = 1;
2657               p += strlen(p) - 1;
2658             }
2659           break;
2660         case 'w':
2661         case 'W':
2662           {
2663             struct win *oldfore = 0;
2664             char *ss;
2665
2666             if (display)
2667               {
2668                 oldfore = D_fore;
2669                 D_fore = win;
2670               }
2671             ss = AddWindows(p, l - 1, (*s == 'w' ? 0 : 1) | (longflg ? 0 : 2) | (plusflg ? 4 : 0), win ? win->w_number : -1);
2672             if (minusflg)
2673                *ss = 0;
2674             if (display)
2675               D_fore = oldfore;
2676           }
2677           if (*p)
2678             qmflag = 1;
2679           p += strlen(p) - 1;
2680           break;
2681         case 'u':
2682           *p = 0;
2683           if (win)
2684             AddOtherUsers(p, l - 1, win);
2685           if (*p)
2686             qmflag = 1;
2687           p += strlen(p) - 1;
2688           break;
2689         case 'f':
2690           *p = 0;
2691           if (win)
2692             AddWindowFlags(p, l - 1, win);
2693           if (*p)
2694             qmflag = 1;
2695           p += strlen(p) - 1;
2696           break;
2697         case 't':
2698           *p = 0;
2699           if (win && (int)strlen(win->w_title) < l)
2700             {
2701               strcpy(p, win->w_title);
2702               if (*p)
2703                 qmflag = 1;
2704             }
2705           p += strlen(p) - 1;
2706           break;
2707         case '{':
2708           {
2709             char rbuf[128];
2710             s++;
2711             for (i = 0; i < 127; i++)
2712               if (s[i] && s[i] != '}')
2713                 rbuf[i] = s[i];
2714               else
2715                 break;
2716             if (s[i] == '}' && winmsg_numrend < MAX_WINMSG_REND)
2717               {
2718                 r = -1;
2719                 rbuf[i] = 0;
2720                 debug1("MakeWinMsg attrcolor %s\n", rbuf);
2721                 if (i != 1 || rbuf[0] != '-')
2722                   r = ParseAttrColor(rbuf, (char *)0, 0);
2723                 if (r != -1 || (i == 1 && rbuf[0] == '-'))
2724                   {
2725                     winmsg_rend[winmsg_numrend] = r;
2726                     winmsg_rendpos[winmsg_numrend] = p - winmsg_buf;
2727                     winmsg_numrend++;
2728                   }
2729               }
2730             s += i;
2731             p--;
2732           }
2733           break;
2734         case 'H':
2735           *p = 0;
2736           if ((int)strlen(HostName) < l)
2737             {
2738               strcpy(p, HostName);
2739               if (*p)
2740                 qmflag = 1;
2741             }
2742           p += strlen(p) - 1;
2743           break;
2744         case 'S':
2745           {
2746             char *session_name;
2747             *p = 0;
2748             session_name = strchr(SockName, '.') + 1;
2749             if ((int)strlen(session_name) < l)
2750               {
2751                 strcpy(p, session_name);
2752                 if (*p)
2753                   qmflag = 1;
2754               }
2755             p += strlen(p) - 1;
2756           }
2757           break;
2758         case 'p':
2759           {
2760             sprintf(p, "%d", (plusflg && display) ? D_userpid : getpid());
2761             p += strlen(p) - 1;
2762           }
2763           break;
2764         case 'F':
2765           p--;
2766           /* small hack */
2767           if (display && ((ev && ev == &D_forecv->c_captev) || (!ev && win && win == D_fore)))
2768             minusflg = !minusflg;
2769           if (minusflg)
2770             qmflag = 1;
2771           break;
2772         case '>':
2773           truncpos = p - winmsg_buf;
2774           truncper = num > 100 ? 100 : num;
2775           trunclong = longflg;
2776           p--;
2777           break;
2778         case '=':
2779         case '<':
2780           *p = ' ';
2781           if (num || zeroflg || plusflg || longflg || (*s != '='))
2782             {
2783               /* expand all pads */
2784               if (minusflg)
2785                 {
2786                   num = (plusflg ? lastpad : padlen) - num;
2787                   if (!plusflg && padlen == 0)
2788                     num = p - winmsg_buf;
2789                   plusflg = 0;
2790                 }
2791               else if (!zeroflg)
2792                 {
2793                   if (*s != '=' && num == 0 && !plusflg)
2794                     num = 100;
2795                   if (num > 100)
2796                     num = 100;
2797                   if (padlen == 0)
2798                     num = p - winmsg_buf;
2799                   else
2800                     num = (padlen - (plusflg ? lastpad : 0)) * num / 100;
2801                 }
2802               if (num < 0)
2803                 num = 0;
2804               if (plusflg)
2805                 num += lastpad;
2806               if (num > MAXSTR - 1)
2807                 num = MAXSTR - 1;
2808               if (numpad)
2809                 p = pad_expand(winmsg_buf, p, numpad, num);
2810               numpad = 0;
2811               if (p - winmsg_buf > num && !longflg)
2812                 {
2813                   int left, trunc;
2814
2815                   if (truncpos == -1)
2816                     {
2817                       truncpos = lastpad;
2818                       truncper = 0;
2819                     }
2820                   trunc = lastpad + truncper * (num - lastpad) / 100;
2821                   if (trunc > num)
2822                     trunc = num;
2823                   if (trunc < lastpad)
2824                     trunc = lastpad;
2825                   left = truncpos - trunc;
2826                   if (left > p - winmsg_buf - num)
2827                     left = p - winmsg_buf - num;
2828                   debug1("lastpad = %d, ", lastpad);
2829                   debug3("truncpos = %d, trunc = %d, left = %d\n", truncpos, trunc, left);
2830                   if (left > 0)
2831                     {
2832                       if (left + lastpad > p - winmsg_buf)
2833                         left = p - winmsg_buf - lastpad;
2834                       if (p - winmsg_buf - lastpad - left > 0)
2835                         bcopy(winmsg_buf + lastpad + left, winmsg_buf + lastpad,  p - winmsg_buf - lastpad - left);
2836                       p -= left;
2837                       r = winmsg_numrend;
2838                       while (r && winmsg_rendpos[r - 1] > lastpad)
2839                         {
2840                           r--;
2841                           winmsg_rendpos[r] -= left;
2842                           if (winmsg_rendpos[r] < lastpad)
2843                             winmsg_rendpos[r] = lastpad;
2844                         }
2845                       if (trunclong)
2846                         {
2847                           if (p - winmsg_buf > lastpad)
2848                             winmsg_buf[lastpad] = '.';
2849                           if (p - winmsg_buf > lastpad + 1)
2850                             winmsg_buf[lastpad + 1] = '.';
2851                           if (p - winmsg_buf > lastpad + 2)
2852                             winmsg_buf[lastpad + 2] = '.';
2853                         }
2854                     }
2855                   if (p - winmsg_buf > num)
2856                     {
2857                       p = winmsg_buf + num;
2858                       if (trunclong)
2859                         {
2860                           if (num - 1 >= lastpad)
2861                             p[-1] = '.';
2862                           if (num - 2 >= lastpad)
2863                             p[-2] = '.';
2864                           if (num - 3 >= lastpad)
2865                             p[-3] = '.';
2866                         }
2867                       r = winmsg_numrend;
2868                       while (r && winmsg_rendpos[r - 1] > num)
2869                         winmsg_rendpos[--r] = num;
2870                     }
2871                   truncpos = -1;
2872                   trunclong = 0;
2873                   if (lastpad > p - winmsg_buf)
2874                     lastpad = p - winmsg_buf;
2875                   debug1("lastpad now %d\n", lastpad);
2876                 }
2877               if (*s == '=')
2878                 {
2879                   while (p - winmsg_buf < num)
2880                     *p++ = ' ';
2881                   lastpad = p - winmsg_buf;
2882                   truncpos = -1;
2883                   trunclong = 0;
2884                   debug1("lastpad2 now %d\n", lastpad);
2885                 }
2886               p--;
2887             }
2888           else if (padlen)
2889             {
2890               *p = 127;         /* internal pad representation */
2891               numpad++;
2892             }
2893           break;
2894         case 'n':
2895           s++;
2896           /* FALLTHROUGH */
2897         default:
2898           s--;
2899           if (l > 10 + num)
2900             {
2901               if (num == 0)
2902                 num = 1;
2903               if (!win)
2904                 sprintf(p, "%*s", num, num > 1 ? "--" : "-");
2905               else
2906                 sprintf(p, "%*d", num, win->w_number);
2907               qmflag = 1;
2908               p += strlen(p) - 1;
2909             }
2910           break;
2911         }
2912     }
2913   if (qmpos && !qmflag)
2914     p = qmpos + 1;
2915   *p = '\0';
2916   if (numpad)
2917     {
2918       if (padlen > MAXSTR - 1)
2919         padlen = MAXSTR - 1;
2920       p = pad_expand(winmsg_buf, p, numpad, padlen);
2921     }
2922   if (ev)
2923     {
2924       evdeq(ev);                /* just in case */
2925       ev->timeout.tv_sec = 0;
2926       ev->timeout.tv_usec = 0;
2927     }
2928   if (ev && tick)
2929     {
2930       now.tv_usec = 100000;
2931       if (tick == 1)
2932         now.tv_sec++;
2933       else
2934         now.tv_sec += tick - (now.tv_sec % tick);
2935       ev->timeout = now;
2936       debug2("NEW timeout %d %d\n", ev->timeout.tv_sec, tick);
2937     }
2938   return winmsg_buf;
2939 }
2940
2941 char *
2942 MakeWinMsg(s, win, esc)
2943 char *s;
2944 struct win *win;
2945 int esc;
2946 {
2947   return MakeWinMsgEv(s, win, esc, 0, (struct event *)0, 0);
2948 }
2949
2950 void
2951 PutWinMsg(s, start, max)
2952 char *s;
2953 int start, max;
2954 {
2955   int i, p, l, r, n;
2956   struct mchar rend;
2957   struct mchar rendstack[MAX_WINMSG_REND];
2958   int rendstackn = 0;
2959
2960   if (s != winmsg_buf)
2961     {
2962       /* sorry, no fancy coloring available */
2963       debug1("PutWinMsg %s plain\n", s);
2964       l = strlen(s);
2965       if (l > max)
2966         l = max;
2967       l -= start;
2968       s += start;
2969       while (l-- > 0)
2970         PUTCHARLP(*s++);
2971       return;
2972     }
2973   rend = D_rend;
2974   p = 0;
2975   l = strlen(s);
2976   debug2("PutWinMsg %s start attr %x\n", s, rend.attr);
2977   for (i = 0; i < winmsg_numrend && max > 0; i++)
2978     {
2979       if (p > winmsg_rendpos[i] || winmsg_rendpos[i] > l)
2980         break;
2981       if (p < winmsg_rendpos[i])
2982         {
2983           n = winmsg_rendpos[i] - p;
2984           if (n > max)
2985             n = max;
2986           max -= n;
2987           p += n;
2988           while(n-- > 0)
2989             {
2990               if (start-- > 0)
2991                 s++;
2992               else
2993                 PUTCHARLP(*s++);
2994             }
2995         }
2996       r = winmsg_rend[i];
2997       if (r == -1)
2998         {
2999           if (rendstackn > 0)
3000             rend = rendstack[--rendstackn];
3001         }
3002       else
3003         {
3004           rendstack[rendstackn++] = rend;
3005           ApplyAttrColor(r, &rend);
3006         }
3007       SetRendition(&rend);
3008     }
3009   if (p < l)
3010     {
3011       n = l - p;
3012       if (n > max)
3013         n = max;
3014       while(n-- > 0)
3015         {
3016           if (start-- > 0)
3017             s++;
3018           else
3019             PUTCHARLP(*s++);
3020         }
3021     }
3022 }
3023
3024
3025 #ifdef DEBUG
3026 static void
3027 fds1(i, j)
3028 int i, j;
3029 {
3030   while (i < j)
3031     {
3032       debug1("%d ", i);
3033       i++;
3034     }
3035   if ((j = open("/dev/null", 0)) >= 0)
3036     {
3037       fds1(i + 1, j);
3038       close(j);
3039     }
3040   else
3041     {
3042       while (dup(++i) < 0 && errno != EBADF)
3043         debug1("%d ", i);
3044       debug1(" [%d]\n", i);
3045     }
3046 }
3047
3048 static void
3049 fds()
3050 {
3051   debug("fds: ");
3052   fds1(-1, -1);
3053 }
3054 #endif
3055
3056 static void
3057 serv_read_fn(ev, data)
3058 struct event *ev;
3059 char *data;
3060 {
3061   debug("Knock - knock!\n");
3062   ReceiveMsg();
3063 }
3064
3065 static void
3066 serv_select_fn(ev, data)
3067 struct event *ev;
3068 char *data;
3069 {
3070   struct win *p;
3071
3072   debug("serv_select_fn called\n");
3073   /* XXX: messages?? */
3074   if (GotSigChld)
3075     {
3076       SigChldHandler();
3077     }
3078   if (InterruptPlease)
3079     {
3080       debug("Backend received interrupt\n");
3081       /* This approach is rather questionable in a multi-display
3082        * environment */
3083       if (fore && displays)
3084         {
3085 #if defined(TERMIO) || defined(POSIX)
3086           char ibuf = displays->d_OldMode.tio.c_cc[VINTR];
3087 #else
3088           char ibuf = displays->d_OldMode.m_tchars.t_intrc;
3089 #endif
3090 #ifdef PSEUDOS
3091           write(W_UWP(fore) ? fore->w_pwin->p_ptyfd : fore->w_ptyfd,
3092                 &ibuf, 1);
3093           debug1("Backend wrote interrupt to %d", fore->w_number);
3094           debug1("%s\n", W_UWP(fore) ? " (pseudowin)" : "");
3095 #else
3096           write(fore->w_ptyfd, &ibuf, 1);
3097           debug1("Backend wrote interrupt to %d\n", fore->w_number);
3098 #endif
3099         }
3100       InterruptPlease = 0;
3101     }
3102
3103   for (p = windows; p; p = p->w_next)
3104     {
3105       if (p->w_bell == BELL_FOUND || p->w_bell == BELL_VISUAL)
3106         {
3107           struct canvas *cv;
3108           int visual = p->w_bell == BELL_VISUAL || visual_bell;
3109           p->w_bell = BELL_ON;
3110           for (display = displays; display; display = display->d_next)
3111             {
3112               for (cv = D_cvlist; cv; cv = cv->c_next)
3113                 if (cv->c_layer->l_bottom == &p->w_layer)
3114                   break;
3115               if (cv == 0)
3116                 {
3117                   p->w_bell = BELL_DONE;
3118                   Msg(0, "%s", MakeWinMsg(BellString, p, '%'));
3119                 }
3120               else if (visual && !D_VB && (!D_status || !D_status_bell))
3121                 {
3122                   Msg(0, "%s", VisualBellString);
3123                   if (D_status)
3124                     {
3125                       D_status_bell = 1;
3126                       debug1("using vbell timeout %d\n", VBellWait);
3127                       SetTimeout(&D_statusev, VBellWait );
3128                     }
3129                 }
3130             }
3131           /* don't annoy the user with two messages */
3132           if (p->w_monitor == MON_FOUND)
3133             p->w_monitor = MON_DONE;
3134           WindowChanged(p, 'f');
3135         }
3136       if (p->w_monitor == MON_FOUND)
3137         {
3138           struct canvas *cv;
3139           p->w_monitor = MON_ON;
3140           for (display = displays; display; display = display->d_next)
3141             {
3142               for (cv = D_cvlist; cv; cv = cv->c_next)
3143                 if (cv->c_layer->l_bottom == &p->w_layer)
3144                   break;
3145               if (cv)
3146                 continue;       /* user already sees window */
3147 #ifdef MULTIUSER
3148               if (!(ACLBYTE(p->w_mon_notify, D_user->u_id) & ACLBIT(D_user->u_id)))
3149                 continue;       /* user doesn't care */
3150 #endif
3151               Msg(0, "%s", MakeWinMsg(ActivityString, p, '%'));
3152               p->w_monitor = MON_DONE;
3153             }
3154           WindowChanged(p, 'f');
3155         }
3156     }
3157
3158   for (display = displays; display; display = display->d_next)
3159     {
3160       struct canvas *cv;
3161       if (D_status == STATUS_ON_WIN)
3162         continue;
3163       /* XXX: should use display functions! */
3164       for (cv = D_cvlist; cv; cv = cv->c_next)
3165         {
3166           int lx, ly;
3167
3168           /* normalize window, see resize.c */
3169           lx = cv->c_layer->l_x;
3170           ly = cv->c_layer->l_y;
3171           if (lx == cv->c_layer->l_width)
3172             lx--;
3173           if (ly + cv->c_yoff < cv->c_ys)
3174             {
3175               int i, n = cv->c_ys - (ly + cv->c_yoff);
3176               cv->c_yoff = cv->c_ys - ly;
3177               RethinkViewportOffsets(cv);
3178               if (n > cv->c_layer->l_height)
3179                 n = cv->c_layer->l_height;
3180               CV_CALL(cv,
3181                 LScrollV(flayer, -n, 0, flayer->l_height - 1, 0);
3182                 LayRedisplayLine(-1, -1, -1, 1);
3183                 for (i = 0; i < n; i++)
3184                   LayRedisplayLine(i, 0, flayer->l_width - 1, 1);
3185                 if (cv == cv->c_display->d_forecv)
3186                   LaySetCursor();
3187               );
3188             }
3189           else if (ly + cv->c_yoff > cv->c_ye)
3190             {
3191               int i, n = ly + cv->c_yoff - cv->c_ye;
3192               cv->c_yoff = cv->c_ye - ly;
3193               RethinkViewportOffsets(cv);
3194               if (n > cv->c_layer->l_height)
3195                 n = cv->c_layer->l_height;
3196               CV_CALL(cv,
3197                 LScrollV(flayer, n, 0, cv->c_layer->l_height - 1, 0);
3198                 LayRedisplayLine(-1, -1, -1, 1);
3199                 for (i = 0; i < n; i++)
3200                   LayRedisplayLine(i + flayer->l_height - n, 0, flayer->l_width - 1, 1);
3201                 if (cv == cv->c_display->d_forecv)
3202                   LaySetCursor();
3203               );
3204             }
3205           if (lx + cv->c_xoff < cv->c_xs)
3206             {
3207               int i, n = cv->c_xs - (lx + cv->c_xoff);
3208               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3209                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3210               if (cv->c_xoff + n > cv->c_xs)
3211                 n = cv->c_xs - cv->c_xoff;
3212               cv->c_xoff += n;
3213               RethinkViewportOffsets(cv);
3214               if (n > cv->c_layer->l_width)
3215                 n = cv->c_layer->l_width;
3216               CV_CALL(cv,
3217                 LayRedisplayLine(-1, -1, -1, 1);
3218                 for (i = 0; i < flayer->l_height; i++)
3219                   {
3220                     LScrollH(flayer, -n, i, 0, flayer->l_width - 1, 0, 0);
3221                     LayRedisplayLine(i, 0, n - 1, 1);
3222                   }
3223                 if (cv == cv->c_display->d_forecv)
3224                   LaySetCursor();
3225               );
3226             }
3227           else if (lx + cv->c_xoff > cv->c_xe)
3228             {
3229               int i, n = lx + cv->c_xoff - cv->c_xe;
3230               if (n < (cv->c_xe - cv->c_xs + 1) / 2)
3231                 n = (cv->c_xe - cv->c_xs + 1) / 2;
3232               if (cv->c_xoff - n + cv->c_layer->l_width - 1 < cv->c_xe)
3233                 n = cv->c_xoff + cv->c_layer->l_width - 1 - cv->c_xe;
3234               cv->c_xoff -= n;
3235               RethinkViewportOffsets(cv);
3236               if (n > cv->c_layer->l_width)
3237                 n = cv->c_layer->l_width;
3238               CV_CALL(cv,
3239                 LayRedisplayLine(-1, -1, -1, 1);
3240                 for (i = 0; i < flayer->l_height; i++)
3241                   {
3242                     LScrollH(flayer, n, i, 0, flayer->l_width - 1, 0, 0);
3243                     LayRedisplayLine(i, flayer->l_width - n, flayer->l_width - 1, 1);
3244                   }
3245                 if (cv == cv->c_display->d_forecv)
3246                   LaySetCursor();
3247               );
3248             }
3249         }
3250     }
3251
3252   for (display = displays; display; display = display->d_next)
3253     {
3254       if (D_status == STATUS_ON_WIN || D_cvlist == 0 || D_cvlist->c_next == 0)
3255         continue;
3256       debug1("serv_select_fn: Restore on cv %#x\n", (int)D_forecv);
3257       CV_CALL(D_forecv, LayRestore();LaySetCursor());
3258     }
3259 }
3260
3261 static void
3262 logflush_fn(ev, data)
3263 struct event *ev;
3264 char *data;
3265 {
3266   struct win *p;
3267   char *buf;
3268   int n;
3269
3270   if (!islogfile(NULL))
3271     return;             /* no more logfiles */
3272   logfflush(NULL);
3273   n = log_flush ? log_flush : (logtstamp_after + 4) / 5;
3274   if (n)
3275     {
3276       SetTimeout(ev, n * 1000);
3277       evenq(ev);        /* re-enqueue ourself */
3278     }
3279   if (!logtstamp_on)
3280     return;
3281   /* write fancy time-stamp */
3282   for (p = windows; p; p = p->w_next)
3283     {
3284       if (!p->w_log)
3285         continue;
3286       p->w_logsilence += n;
3287       if (p->w_logsilence < logtstamp_after)
3288         continue;
3289       if (p->w_logsilence - n >= logtstamp_after)
3290         continue;
3291       buf = MakeWinMsg(logtstamp_string, p, '%');
3292       logfwrite(p->w_log, buf, strlen(buf));
3293     }
3294 }
3295
3296 /*
3297  * Interprets ^?, ^@ and other ^-control-char notation.
3298  * Interprets \ddd octal notation
3299  *
3300  * The result is placed in *cp, p is advanced behind the parsed expression and
3301  * returned.
3302  */
3303 static char *
3304 ParseChar(p, cp)
3305 char *p, *cp;
3306 {
3307   if (*p == 0)
3308     return 0;
3309   if (*p == '^' && p[1])
3310     {
3311       if (*++p == '?')
3312         *cp = '\177';
3313       else if (*p >= '@')
3314         *cp = Ctrl(*p);
3315       else
3316         return 0;
3317       ++p;
3318     }
3319   else if (*p == '\\' && *++p <= '7' && *p >= '0')
3320     {
3321       *cp = 0;
3322       do
3323         *cp = *cp * 8 + *p - '0';
3324       while (*++p <= '7' && *p >= '0');
3325     }
3326   else
3327     *cp = *p++;
3328   return p;
3329 }
3330
3331 static int
3332 ParseEscape(p)
3333 char *p;
3334 {
3335   unsigned char buf[2];
3336
3337   if (*p == 0)
3338     SetEscape((struct acluser *)0, -1, -1);
3339   else
3340     {
3341       if ((p = ParseChar(p, (char *)buf)) == NULL ||
3342           (p = ParseChar(p, (char *)buf+1)) == NULL || *p)
3343         return -1;
3344       SetEscape((struct acluser *)0, buf[0], buf[1]);
3345     }
3346   return 0;
3347 }
3348