contrib/top/top.c

   1 char *copyright =
   2     "Copyright (c) 1984 through 1996, William LeFebvre";
   3
   4 /*
   5  *  Top users/processes display for Unix
   6  *  Version 3
   7  *
   8  *  This program may be freely redistributed,
   9  *  but this entire comment MUST remain intact.
  10  *
  11  *  Copyright (c) 1984, 1989, William LeFebvre, Rice University
  12  *  Copyright (c) 1989 - 1994, William LeFebvre, Northwestern University
  13  *  Copyright (c) 1994, 1995, William LeFebvre, Argonne National Laboratory
  14  *  Copyright (c) 1996, William LeFebvre, Group sys Consulting
  15  *
  16  * $FreeBSD: src/contrib/top/top.c,v 1.4.6.5 2002/08/11 17:09:25 dwmalone Exp $
  17  * $DragonFly: src/contrib/top/top.c,v 1.3 2006/02/15 12:54:36 corecode Exp $
  18  */
  19
  20 /*
  21  *  See the file "Changes" for information on version-to-version changes.
  22  */
  23
  24 /*
  25  *  This file contains "main" and other high-level routines.
  26  */
  27
  28 /*
  29  * The following preprocessor variables, when defined, are used to
  30  * distinguish between different Unix implementations:
  31  *
  32  *      SIGHOLD  - use SVR4 sighold function when defined
  33  *      SIGRELSE - use SVR4 sigrelse function when defined
  34  *      FD_SET   - macros FD_SET and FD_ZERO are used when defined
  35  */
  36
  37 #include "os.h"
  38 #include <errno.h>
  39 #include <signal.h>
  40 #include <setjmp.h>
  41 #include <ctype.h>
  42 #include <sys/time.h>
  43
  44 /* includes specific to top */
  45 #include "display.h"            /* interface to display package */
  46 #include "screen.h"             /* interface to screen package */
  47 #include "top.h"
  48 #include "top.local.h"
  49 #include "boolean.h"
  50 #include "machine.h"
  51 #include "utils.h"
  52
  53 /* Size of the stdio buffer given to stdout */
  54 #define Buffersize      2048
  55
  56 /* The buffer that stdio will use */
  57 char stdoutbuf[Buffersize];
  58
  59 /* build Signal masks */
  60 #define Smask(s)        (1 << ((s) - 1))
  61
  62 /* for getopt: */
  63 extern int  optind;
  64 extern char *optarg;
  65
  66 /* imported from screen.c */
  67 extern int overstrike;
  68
  69 /* signal handling routines */
  70 sigret_t leave();
  71 sigret_t onalrm();
  72 sigret_t tstop();
  73 #ifdef SIGWINCH
  74 sigret_t winch();
  75 #endif
  76
  77 volatile sig_atomic_t leaveflag;
  78 volatile sig_atomic_t tstopflag;
  79 volatile sig_atomic_t winchflag;
  80
  81 /* internal routines */
  82 void quit();
  83
  84 /* values which need to be accessed by signal handlers */
  85 static int max_topn;            /* maximum displayable processes */
  86
  87 /* miscellaneous things */
  88 char *myname = "top";
  89 jmp_buf jmp_int;
  90
  91 /* routines that don't return int */
  92
  93 char *username();
  94 char *ctime();
  95 char *kill_procs();
  96 char *renice_procs();
  97
  98 #ifdef ORDER
  99 extern int (*proc_compares[])();
 100 #else
 101 extern int proc_compare();
 102 #endif
 103 time_t time();
 104
 105 caddr_t get_process_info();
 106
 107 /* different routines for displaying the user's identification */
 108 /* (values assigned to get_userid) */
 109 char *username();
 110 char *itoa7();
 111
 112 /* display routines that need to be predeclared */
 113 int i_loadave();
 114 int u_loadave();
 115 int i_procstates();
 116 int u_procstates();
 117 int i_cpustates();
 118 int u_cpustates();
 119 int i_memory();
 120 int u_memory();
 121 int i_swap();
 122 int u_swap();
 123 int i_message();
 124 int u_message();
 125 int i_header();
 126 int u_header();
 127 int i_process();
 128 int u_process();
 129
 130 /* pointers to display routines */
 131 int (*d_loadave)() = i_loadave;
 132 int (*d_procstates)() = i_procstates;
 133 int (*d_cpustates)() = i_cpustates;
 134 int (*d_memory)() = i_memory;
 135 int (*d_swap)() = i_swap;
 136 int (*d_message)() = i_message;
 137 int (*d_header)() = i_header;
 138 int (*d_process)() = i_process;
 139
 140
 141 main(argc, argv)
 142
 143 int  argc;
 144 char *argv[];
 145
 146 {
 147     register int i;
 148     register int active_procs;
 149     register int change;
 150
 151     struct system_info system_info;
 152     struct statics statics;
 153     caddr_t processes;
 154
 155     static char tempbuf1[50];
 156     static char tempbuf2[50];
 157     int old_sigmask;            /* only used for BSD-style signals */
 158     int topn = Default_TOPN;
 159     int delay = Default_DELAY;
 160     int displays = 0;           /* indicates unspecified */
 161     int sel_ret = 0;
 162     time_t curr_time;
 163     char *(*get_userid)() = username;
 164     char *uname_field = "USERNAME";
 165     char *header_text;
 166     char *env_top;
 167     char **preset_argv;
 168     int  preset_argc = 0;
 169     char **av;
 170     int  ac;
 171     char dostates = No;
 172     char do_unames = Yes;
 173     char interactive = Maybe;
 174     char warnings = 0;
 175 #if Default_TOPN == Infinity
 176     char topn_specified = No;
 177 #endif
 178     char ch;
 179     char *iptr;
 180     char no_command = 1;
 181     struct timeval timeout;
 182     struct process_select ps;
 183 #ifdef ORDER
 184     char *order_name = NULL;
 185     int order_index = 0;
 186 #endif
 187 #ifndef FD_SET
 188     /* FD_SET and friends are not present:  fake it */
 189     typedef int fd_set;
 190 #define FD_ZERO(x)     (*(x) = 0)
 191 #define FD_SET(f, x)   (*(x) = 1<<f)
 192 #endif
 193     fd_set readfds;
 194
 195 #ifdef ORDER
 196     static char command_chars[] = "\f qh?en#sdkriIutTOSo";
 197 #else
 198     static char command_chars[] = "\f qh?en#sdkriIutTOSO";
 199 #endif
 200 /* these defines enumerate the "strchr"s of the commands in command_chars */
 201 #define CMD_redraw      0
 202 #define CMD_update      1
 203 #define CMD_quit        2
 204 #define CMD_help1       3
 205 #define CMD_help2       4
 206 #define CMD_OSLIMIT     4    /* terminals with OS can only handle commands */
 207 #define CMD_errors      5    /* less than or equal to CMD_OSLIMIT          */
 208 #define CMD_number1     6
 209 #define CMD_number2     7
 210 #define CMD_delay       8
 211 #define CMD_displays    9
 212 #define CMD_kill        10
 213 #define CMD_renice      11
 214 #define CMD_idletog     12
 215 #define CMD_idletog2    13
 216 #define CMD_user        14
 217 #define CMD_selftog     15
 218 #define CMD_threads     16
 219 #define CMD_othreads    17
 220 #define CMD_system      18
 221 #ifdef ORDER
 222 #define CMD_order       19
 223 #endif
 224
 225     /* set the buffer for stdout */
 226 #ifdef DEBUG
 227     extern FILE *debug;
 228     debug = fopen("debug.run", "w");
 229     setbuffer(stdout, NULL, 0);
 230 #else
 231     setbuffer(stdout, stdoutbuf, Buffersize);
 232 #endif
 233
 234     /* get our name */
 235     if (argc > 0)
 236     {
 237         if ((myname = strrchr(argv[0], '/')) == 0)
 238         {
 239             myname = argv[0];
 240         }
 241         else
 242         {
 243             myname++;
 244         }
 245     }
 246
 247     /* initialize some selection options */
 248     ps.idle    = Yes;
 249     ps.self    = -1;
 250     ps.system  = No;
 251     ps.threads = No;
 252     ps.only_threads = No;
 253     ps.uid     = -1;
 254     ps.command = NULL;
 255
 256     /* get preset options from the environment */
 257     if ((env_top = getenv("TOP")) != NULL)
 258     {
 259         av = preset_argv = argparse(env_top, &preset_argc);
 260         ac = preset_argc;
 261
 262         /* set the dummy argument to an explanatory message, in case
 263            getopt encounters a bad argument */
 264         preset_argv[0] = "while processing environment";
 265     }
 266
 267     /* process options */
 268     do {
 269         /* if we're done doing the presets, then process the real arguments */
 270         if (preset_argc == 0)
 271         {
 272             ac = argc;
 273             av = argv;
 274
 275             /* this should keep getopt happy... */
 276             optind = 1;
 277         }
 278
 279         while ((i = getopt(ac, av, "SITONbinquvs:d:U:o:t")) != EOF)
 280         {
 281             switch(i)
 282             {
 283               case 'v':                 /* show version number */
 284                 fprintf(stderr, "%s: version %s\n",
 285                         myname, version_string());
 286                 exit(1);
 287                 break;
 288
 289               case 'u':                 /* toggle uid/username display */
 290                 do_unames = !do_unames;
 291                 break;
 292
 293               case 'U':                 /* display only username's processes */
 294                 if ((ps.uid = userid(optarg)) == -1)
 295                 {
 296                     fprintf(stderr, "%s: unknown user\n", optarg);
 297                     exit(1);
 298                 }
 299                 break;
 300
 301               case 'S':                 /* show system processes */
 302                 ps.system = !ps.system;
 303                 break;
 304
 305               case 'I':                   /* show idle processes */
 306                 ps.idle = !ps.idle;
 307                 break;
 308
 309               case 'O':
 310                 ps.only_threads = !ps.only_threads; /* only threads */
 311                 break;
 312
 313               case 'T':
 314                 ps.threads = !ps.threads;       /* show threads */
 315                 break;
 316
 317               case 'i':                 /* go interactive regardless */
 318                 interactive = Yes;
 319                 break;
 320
 321               case 'n':                 /* batch, or non-interactive */
 322               case 'b':
 323                 interactive = No;
 324                 break;
 325
 326               case 'd':                 /* number of displays to show */
 327                 if ((i = atoiwi(optarg)) == Invalid || i == 0)
 328                 {
 329                     fprintf(stderr,
 330                         "%s: warning: display count should be positive -- option ignored\n",
 331                         myname);
 332                     warnings++;
 333                 }
 334                 else
 335                 {
 336                     displays = i;
 337                 }
 338                 break;
 339
 340               case 's':
 341                 if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
 342                 {
 343                     fprintf(stderr,
 344                         "%s: warning: seconds delay should be positive -- using default\n",
 345                         myname);
 346                     delay = Default_DELAY;
 347                     warnings++;
 348                 }
 349                 break;
 350
 351               case 'q':         /* be quick about it */
 352                 /* only allow this if user is really root */
 353                 if (getuid() == 0)
 354                 {
 355                     /* be very un-nice! */
 356                     (void) nice(-20);
 357                 }
 358                 else
 359                 {
 360                     fprintf(stderr,
 361                         "%s: warning: `-q' option can only be used by root\n",
 362                         myname);
 363                     warnings++;
 364                 }
 365                 break;
 366
 367               case 'o':         /* select sort order */
 368 #ifdef ORDER
 369                 order_name = optarg;
 370 #else
 371                 fprintf(stderr,
 372                         "%s: this platform does not support arbitrary ordering.  Sorry.\n",
 373                         myname);
 374                 warnings++;
 375 #endif
 376                 break;
 377
 378               case 't':
 379                 ps.self = (ps.self == -1) ? getpid() : -1;
 380                 break;
 381
 382               default:
 383                 fprintf(stderr, "\
 384 Top version %s\n\
 385 Usage: %s [-ISbinqut] [-d x] [-s x] [-o field] [-U username] [number]\n",
 386                         version_string(), myname);
 387                 exit(1);
 388             }
 389         }
 390
 391         /* get count of top processes to display (if any) */
 392         if (optind < ac)
 393         {
 394             if ((topn = atoiwi(av[optind])) == Invalid)
 395             {
 396                 fprintf(stderr,
 397                         "%s: warning: process display count should be non-negative -- using default\n",
 398                         myname);
 399                 warnings++;
 400             }
 401 #if Default_TOPN == Infinity
 402             else
 403             {
 404                 topn_specified = Yes;
 405             }
 406 #endif
 407         }
 408
 409         /* tricky:  remember old value of preset_argc & set preset_argc = 0 */
 410         i = preset_argc;
 411         preset_argc = 0;
 412
 413     /* repeat only if we really did the preset arguments */
 414     } while (i != 0);
 415
 416     /* set constants for username/uid display correctly */
 417     if (!do_unames)
 418     {
 419         uname_field = "   UID  ";
 420         get_userid = itoa7;
 421     }
 422
 423     /* initialize the kernel memory interface */
 424     if (machine_init(&statics) == -1)
 425     {
 426         exit(1);
 427     }
 428
 429 #ifdef ORDER
 430     /* determine sorting order index, if necessary */
 431     if (order_name != NULL)
 432     {
 433         if ((order_index = string_index(order_name, statics.order_names)) == -1)
 434         {
 435             char **pp;
 436
 437             fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
 438                     myname, order_name);
 439             fprintf(stderr, "\tTry one of these:");
 440             pp = statics.order_names;
 441             while (*pp != NULL)
 442             {
 443                 fprintf(stderr, " %s", *pp++);
 444             }
 445             fputc('\n', stderr);
 446             exit(1);
 447         }
 448     }
 449 #endif
 450
 451 #ifdef no_initialization_needed
 452     /* initialize the hashing stuff */
 453     if (do_unames)
 454     {
 455         init_hash();
 456     }
 457 #endif
 458
 459     /* initialize termcap */
 460     init_termcap(interactive);
 461
 462     /* get the string to use for the process area header */
 463     header_text = format_header(uname_field);
 464
 465     /* initialize display interface */
 466     if ((max_topn = display_init(&statics)) == -1)
 467     {
 468         fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
 469         exit(4);
 470     }
 471
 472     /* print warning if user requested more processes than we can display */
 473     if (topn > max_topn)
 474     {
 475         fprintf(stderr,
 476                 "%s: warning: this terminal can only display %d processes.\n",
 477                 myname, max_topn);
 478         warnings++;
 479     }
 480
 481     /* adjust for topn == Infinity */
 482     if (topn == Infinity)
 483     {
 484         /*
 485          *  For smart terminals, infinity really means everything that can
 486          *  be displayed, or Largest.
 487          *  On dumb terminals, infinity means every process in the system!
 488          *  We only really want to do that if it was explicitly specified.
 489          *  This is always the case when "Default_TOPN != Infinity".  But if
 490          *  topn wasn't explicitly specified and we are on a dumb terminal
 491          *  and the default is Infinity, then (and only then) we use
 492          *  "Nominal_TOPN" instead.
 493          */
 494 #if Default_TOPN == Infinity
 495         topn = smart_terminal ? Largest :
 496                     (topn_specified ? Largest : Nominal_TOPN);
 497 #else
 498         topn = Largest;
 499 #endif
 500     }
 501
 502     /* set header display accordingly */
 503     display_header(topn > 0);
 504
 505     /* determine interactive state */
 506     if (interactive == Maybe)
 507     {
 508         interactive = smart_terminal;
 509     }
 510
 511     /* if # of displays not specified, fill it in */
 512     if (displays == 0)
 513     {
 514         displays = smart_terminal ? Infinity : 1;
 515     }
 516
 517     /* hold interrupt signals while setting up the screen and the handlers */
 518 #ifdef SIGHOLD
 519     sighold(SIGINT);
 520     sighold(SIGQUIT);
 521     sighold(SIGTSTP);
 522 #else
 523     old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
 524 #endif
 525     init_screen();
 526     (void) signal(SIGINT, leave);
 527     (void) signal(SIGQUIT, leave);
 528     (void) signal(SIGTSTP, tstop);
 529 #ifdef SIGWINCH
 530     (void) signal(SIGWINCH, winch);
 531 #endif
 532 #ifdef SIGRELSE
 533     sigrelse(SIGINT);
 534     sigrelse(SIGQUIT);
 535     sigrelse(SIGTSTP);
 536 #else
 537     (void) sigsetmask(old_sigmask);
 538 #endif
 539     if (warnings)
 540     {
 541         fputs("....", stderr);
 542         fflush(stderr);                 /* why must I do this? */
 543         sleep((unsigned)(3 * warnings));
 544         fputc('\n', stderr);
 545     }
 546
 547 restart:
 548
 549     /*
 550      *  main loop -- repeat while display count is positive or while it
 551      *          indicates infinity (by being -1)
 552      */
 553
 554     while ((displays == -1) || (displays-- > 0))
 555     {
 556         /* get the current stats */
 557         get_system_info(&system_info);
 558
 559         /* get the current set of processes */
 560         processes =
 561                 get_process_info(&system_info,
 562                                  &ps,
 563 #ifdef ORDER
 564                                  proc_compares[order_index]);
 565 #else
 566                                  proc_compare);
 567 #endif
 568
 569         /* display the load averages */
 570         (*d_loadave)(system_info.last_pid,
 571                      system_info.load_avg);
 572
 573         /* display the current time */
 574         /* this method of getting the time SHOULD be fairly portable */
 575         time(&curr_time);
 576         i_uptime(&system_info.boottime, &curr_time);
 577         i_timeofday(&curr_time);
 578
 579         /* display process state breakdown */
 580         (*d_procstates)(system_info.p_total,
 581                         system_info.procstates);
 582
 583         /* display the cpu state percentage breakdown */
 584         if (dostates)   /* but not the first time */
 585         {
 586             (*d_cpustates)(system_info.cpustates);
 587         }
 588         else
 589         {
 590             /* we'll do it next time */
 591             if (smart_terminal)
 592             {
 593                 z_cpustates();
 594             }
 595             else
 596             {
 597                 putchar('\n');
 598             }
 599             dostates = Yes;
 600         }
 601
 602         /* display memory stats */
 603         (*d_memory)(system_info.memory);
 604
 605         /* display swap stats */
 606         (*d_swap)(system_info.swap);
 607
 608         /* handle message area */
 609         (*d_message)();
 610
 611         /* update the header area */
 612         (*d_header)(header_text);
 613
 614         if (topn > 0)
 615         {
 616             /* determine number of processes to actually display */
 617             /* this number will be the smallest of:  active processes,
 618                number user requested, number current screen accomodates */
 619             active_procs = system_info.P_ACTIVE;
 620             if (active_procs > topn)
 621             {
 622                 active_procs = topn;
 623             }
 624             if (active_procs > max_topn)
 625             {
 626                 active_procs = max_topn;
 627             }
 628
 629             /* now show the top "n" processes. */
 630             for (i = 0; i < active_procs; i++)
 631             {
 632                 (*d_process)(i, format_next_process(processes, get_userid));
 633             }
 634         }
 635         else
 636         {
 637             i = 0;
 638         }
 639
 640         /* do end-screen processing */
 641         u_endscreen(i);
 642
 643         /* now, flush the output buffer */
 644         if (fflush(stdout) != 0)
 645         {
 646             new_message(MT_standout, " Write error on stdout");
 647             putchar('\r');
 648             quit(1);
 649             /*NOTREACHED*/
 650         }
 651
 652         /* only do the rest if we have more displays to show */
 653         if (displays)
 654         {
 655             /* switch out for new display on smart terminals */
 656             if (smart_terminal)
 657             {
 658                 if (overstrike)
 659                 {
 660                     reset_display();
 661                 }
 662                 else
 663                 {
 664                     d_loadave = u_loadave;
 665                     d_procstates = u_procstates;
 666                     d_cpustates = u_cpustates;
 667                     d_memory = u_memory;
 668                     d_swap = u_swap;
 669                     d_message = u_message;
 670                     d_header = u_header;
 671                     d_process = u_process;
 672                 }
 673             }
 674
 675             no_command = Yes;
 676             if (!interactive)
 677             {
 678                 /* set up alarm */
 679                 (void) signal(SIGALRM, onalrm);
 680                 (void) alarm((unsigned)delay);
 681
 682                 /* wait for the rest of it .... */
 683                 pause();
 684             }
 685             else while (no_command)
 686             {
 687                 /* assume valid command unless told otherwise */
 688                 no_command = No;
 689
 690                 /* set up arguments for select with timeout */
 691                 FD_ZERO(&readfds);
 692                 FD_SET(0, &readfds);            /* for standard input */
 693                 timeout.tv_sec  = delay;
 694                 timeout.tv_usec = 0;
 695
 696                 if (leaveflag) {
 697                     end_screen();
 698                     exit(0);
 699                 }
 700
 701                 if (tstopflag) {
 702                     /* move to the lower left */
 703                     end_screen();
 704                     fflush(stdout);
 705
 706                     /* default the signal handler action */
 707                     (void) signal(SIGTSTP, SIG_DFL);
 708
 709                     /* unblock the signal and send ourselves one */
 710 #ifdef SIGRELSE
 711                     sigrelse(SIGTSTP);
 712 #else
 713                     (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
 714 #endif
 715                     (void) kill(0, SIGTSTP);
 716
 717                     /* reset the signal handler */
 718                     (void) signal(SIGTSTP, tstop);
 719
 720                     /* reinit screen */
 721                     reinit_screen();
 722                     reset_display();
 723                     tstopflag = 0;
 724                     goto restart;
 725                 }
 726
 727                 if (winchflag) {
 728                     /* reascertain the screen dimensions */
 729                     get_screensize();
 730
 731                     /* tell display to resize */
 732                     max_topn = display_resize();
 733
 734                     /* reset the signal handler */
 735                     (void) signal(SIGWINCH, winch);
 736
 737                     reset_display();
 738                     winchflag = 0;
 739                     goto restart;
 740                 }
 741
 742                 /* wait for either input or the end of the delay period */
 743                 sel_ret = select(2, &readfds, NULL, NULL, &timeout);
 744                 if (sel_ret < 0 && errno != EINTR)
 745                     quit(0);
 746                 if (sel_ret > 0)
 747                 {
 748                     int newval;
 749                     char *errmsg;
 750
 751                     /* something to read -- clear the message area first */
 752                     clear_message();
 753
 754                     /* now read it and convert to command strchr */
 755                     /* (use "change" as a temporary to hold strchr) */
 756                     if (read(0, &ch, 1) != 1)
 757                     {
 758                         /* read error: either 0 or -1 */
 759                         new_message(MT_standout, " Read error on stdin");
 760                         putchar('\r');
 761                         quit(1);
 762                         /*NOTREACHED*/
 763                     }
 764                     if ((iptr = strchr(command_chars, ch)) == NULL)
 765                     {
 766                         if (ch != '\r' && ch != '\n')
 767                         {
 768                             /* illegal command */
 769                             new_message(MT_standout, " Command not understood");
 770                         }
 771                         putchar('\r');
 772                         no_command = Yes;
 773                     }
 774                     else
 775                     {
 776                         change = iptr - command_chars;
 777                         if (overstrike && change > CMD_OSLIMIT)
 778                         {
 779                             /* error */
 780                             new_message(MT_standout,
 781                             " Command cannot be handled by this terminal");
 782                             putchar('\r');
 783                             no_command = Yes;
 784                         }
 785                         else switch(change)
 786                         {
 787                             case CMD_redraw:    /* redraw screen */
 788                                 reset_display();
 789                                 break;
 790
 791                             case CMD_update:    /* merely update display */
 792                                 /* is the load average high? */
 793                                 if (system_info.load_avg[0] > LoadMax)
 794                                 {
 795                                     /* yes, go home for visual feedback */
 796                                     go_home();
 797                                     fflush(stdout);
 798                                 }
 799                                 break;
 800
 801                             case CMD_quit:      /* quit */
 802                                 quit(0);
 803                                 /*NOTREACHED*/
 804                                 break;
 805
 806                             case CMD_help1:     /* help */
 807                             case CMD_help2:
 808                                 reset_display();
 809                                 clear();
 810                                 show_help();
 811                                 standout("Hit any key to continue: ");
 812                                 fflush(stdout);
 813                                 (void) read(0, &ch, 1);
 814                                 break;
 815
 816                             case CMD_errors:    /* show errors */
 817                                 if (error_count() == 0)
 818                                 {
 819                                     new_message(MT_standout,
 820                                         " Currently no errors to report.");
 821                                     putchar('\r');
 822                                     no_command = Yes;
 823                                 }
 824                                 else
 825                                 {
 826                                     reset_display();
 827                                     clear();
 828                                     show_errors();
 829                                     standout("Hit any key to continue: ");
 830                                     fflush(stdout);
 831                                     (void) read(0, &ch, 1);
 832                                 }
 833                                 break;
 834
 835                             case CMD_number1:   /* new number */
 836                             case CMD_number2:
 837                                 new_message(MT_standout,
 838                                     "Number of processes to show: ");
 839                                 newval = readline(tempbuf1, 8, Yes);
 840                                 if (newval > -1)
 841                                 {
 842                                     if (newval > max_topn)
 843                                     {
 844                                         new_message(MT_standout | MT_delayed,
 845                                           " This terminal can only display %d processes.",
 846                                           max_topn);
 847                                         putchar('\r');
 848                                     }
 849
 850                                     if (newval == 0)
 851                                     {
 852                                         /* inhibit the header */
 853                                         display_header(No);
 854                                     }
 855                                     else if (newval > topn && topn == 0)
 856                                     {
 857                                         /* redraw the header */
 858                                         display_header(Yes);
 859                                         d_header = i_header;
 860                                     }
 861                                     topn = newval;
 862                                 }
 863                                 break;
 864
 865                             case CMD_delay:     /* new seconds delay */
 866                                 new_message(MT_standout, "Seconds to delay: ");
 867                                 if ((i = readline(tempbuf1, 8, Yes)) > -1)
 868                                 {
 869                                     if ((delay = i) == 0 && getuid() != 0)
 870                                     {
 871                                         delay = 1;
 872                                     }
 873                                 }
 874                                 clear_message();
 875                                 break;
 876
 877                             case CMD_displays:  /* change display count */
 878                                 new_message(MT_standout,
 879                                         "Displays to show (currently %s): ",
 880                                         displays == -1 ? "infinite" :
 881                                                          itoa(displays));
 882                                 if ((i = readline(tempbuf1, 10, Yes)) > 0)
 883                                 {
 884                                     displays = i;
 885                                 }
 886                                 else if (i == 0)
 887                                 {
 888                                     quit(0);
 889                                 }
 890                                 clear_message();
 891                                 break;
 892
 893                             case CMD_kill:      /* kill program */
 894                                 new_message(0, "kill ");
 895                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 896                                 {
 897                                     if ((errmsg = kill_procs(tempbuf2)) != NULL)
 898                                     {
 899                                         new_message(MT_standout, "%s", errmsg);
 900                                         putchar('\r');
 901                                         no_command = Yes;
 902                                     }
 903                                 }
 904                                 else
 905                                 {
 906                                     clear_message();
 907                                 }
 908                                 break;
 909
 910                             case CMD_renice:    /* renice program */
 911                                 new_message(0, "renice ");
 912                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 913                                 {
 914                                     if ((errmsg = renice_procs(tempbuf2)) != NULL)
 915                                     {
 916                                         new_message(MT_standout, "%s", errmsg);
 917                                         putchar('\r');
 918                                         no_command = Yes;
 919                                     }
 920                                 }
 921                                 else
 922                                 {
 923                                     clear_message();
 924                                 }
 925                                 break;
 926
 927                             case CMD_idletog:
 928                             case CMD_idletog2:
 929                                 ps.idle = !ps.idle;
 930                                 new_message(MT_standout | MT_delayed,
 931                                     " %sisplaying idle processes.",
 932                                     ps.idle ? "D" : "Not d");
 933                                 putchar('\r');
 934                                 break;
 935
 936                             case CMD_selftog:
 937                                 ps.self = (ps.self == -1) ? getpid() : -1;
 938                                 new_message(MT_standout | MT_delayed,
 939                                     " %sisplaying self.",
 940                                     (ps.self == -1) ? "D" : "Not d");
 941                                 putchar('\r');
 942                                 break;
 943
 944                             case CMD_threads:
 945                                 ps.threads = !ps.threads;
 946                                 new_message(MT_standout | MT_delayed,
 947                                    " %sisplaying threads.",
 948                                    ps.threads ? "D" : "Not d");
 949                                 putchar('\r');
 950                                 break;
 951
 952                                 case CMD_othreads:
 953                                         ps.only_threads = !ps.only_threads;
 954                                         new_message(MT_standout | MT_delayed,
 955                                         ps.only_threads ?
 956                                           "Only displaying threads." :
 957                                           "Displaying threads and processes.");
 958                                 putchar('\r');
 959                                 break;
 960
 961                             case CMD_system:
 962                                 ps.system = !ps.system;
 963                                 new_message(MT_standout | MT_delayed,
 964                                    " %sisplaying system processes.",
 965                                    ps.system ? "D" : "Not d");
 966                                 putchar('\r');
 967                                 break;
 968
 969                             case CMD_user:
 970                                 new_message(MT_standout,
 971                                     "Username to show: ");
 972                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 973                                 {
 974                                     if (tempbuf2[0] == '+' &&
 975                                         tempbuf2[1] == '\0')
 976                                     {
 977                                         ps.uid = -1;
 978                                     }
 979                                     else if ((i = userid(tempbuf2)) == -1)
 980                                     {
 981                                         new_message(MT_standout,
 982                                             " %s: unknown user", tempbuf2);
 983                                         no_command = Yes;
 984                                     }
 985                                     else
 986                                     {
 987                                         ps.uid = i;
 988                                     }
 989                                     putchar('\r');
 990                                 }
 991                                 else
 992                                 {
 993                                     clear_message();
 994                                 }
 995                                 break;
 996
 997 #ifdef ORDER
 998                             case CMD_order:
 999                                 new_message(MT_standout,
1000                                     "Order to sort: ");
1001                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1002                                 {
1003                                   if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1004                                         {
1005                                           new_message(MT_standout,
1006                                               " %s: unrecognized sorting order", tempbuf2);
1007                                           no_command = Yes;
1008                                     }
1009                                     else
1010                                     {
1011                                         order_index = i;
1012                                     }
1013                                     putchar('\r');
1014                                 }
1015                                 else
1016                                 {
1017                                     clear_message();
1018                                 }
1019                                 break;
1020 #endif
1021
1022                             default:
1023                                 new_message(MT_standout, " BAD CASE IN SWITCH!");
1024                                 putchar('\r');
1025                         }
1026                     }
1027
1028                     /* flush out stuff that may have been written */
1029                     fflush(stdout);
1030                 }
1031             }
1032         }
1033     }
1034
1035 #ifdef DEBUG
1036     fclose(debug);
1037 #endif
1038     quit(0);
1039     /*NOTREACHED*/
1040 }
1041
1042 /*
1043  *  reset_display() - reset all the display routine pointers so that entire
1044  *      screen will get redrawn.
1045  */
1046
1047 reset_display()
1048
1049 {
1050     d_loadave    = i_loadave;
1051     d_procstates = i_procstates;
1052     d_cpustates  = i_cpustates;
1053     d_memory     = i_memory;
1054     d_swap       = i_swap;
1055     d_message    = i_message;
1056     d_header     = i_header;
1057     d_process    = i_process;
1058 }
1059
1060 /*
1061  *  signal handlers
1062  */
1063
1064 sigret_t leave()        /* exit under normal conditions -- INT handler */
1065
1066 {
1067     leaveflag = 1;
1068 }
1069
1070 sigret_t tstop(i)       /* SIGTSTP handler */
1071
1072 int i;
1073
1074 {
1075     tstopflag = 1;
1076 }
1077
1078 #ifdef SIGWINCH
1079 sigret_t winch(i)               /* SIGWINCH handler */
1080
1081 int i;
1082
1083 {
1084     winchflag = 1;
1085 }
1086 #endif
1087
1088 void quit(status)               /* exit under duress */
1089
1090 int status;
1091
1092 {
1093     end_screen();
1094     exit(status);
1095     /*NOTREACHED*/
1096 }
1097
1098 sigret_t onalrm()       /* SIGALRM handler */
1099
1100 {
1101     /* this is only used in batch mode to break out of the pause() */
1102     /* return; */
1103 }
1104