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  * $FreeBSD$
  17  */
  18
  19 /*
  20  *  See the file "Changes" for information on version-to-version changes.
  21  */
  22
  23 /*
  24  *  This file contains "main" and other high-level routines.
  25  */
  26
  27 /*
  28  * The following preprocessor variables, when defined, are used to
  29  * distinguish between different Unix implementations:
  30  *
  31  *      SIGHOLD  - use SVR4 sighold function when defined
  32  *      SIGRELSE - use SVR4 sigrelse function when defined
  33  *      FD_SET   - macros FD_SET and FD_ZERO are used when defined
  34  */
  35
  36 #include "os.h"
  37 #include <errno.h>
  38 #include <signal.h>
  39 #include <setjmp.h>
  40 #include <ctype.h>
  41 #include <sys/time.h>
  42
  43 /* includes specific to top */
  44 #include "display.h"            /* interface to display package */
  45 #include "screen.h"             /* interface to screen package */
  46 #include "top.h"
  47 #include "top.local.h"
  48 #include "boolean.h"
  49 #include "machine.h"
  50 #include "utils.h"
  51
  52 /* Size of the stdio buffer given to stdout */
  53 #define Buffersize      2048
  54
  55 /* The buffer that stdio will use */
  56 char stdoutbuf[Buffersize];
  57
  58 /* build Signal masks */
  59 #define Smask(s)        (1 << ((s) - 1))
  60
  61 /* for getopt: */
  62 extern int  optind;
  63 extern char *optarg;
  64
  65 /* imported from screen.c */
  66 extern int overstrike;
  67
  68 static int fmt_flags = 0;
  69 int pcpu_stats = No;
  70
  71 /* signal handling routines */
  72 sigret_t leave();
  73 sigret_t onalrm();
  74 sigret_t tstop();
  75 #ifdef SIGWINCH
  76 sigret_t winch();
  77 #endif
  78
  79 volatile sig_atomic_t leaveflag;
  80 volatile sig_atomic_t tstopflag;
  81 volatile sig_atomic_t winchflag;
  82
  83 /* internal routines */
  84 void quit();
  85
  86 /* values which need to be accessed by signal handlers */
  87 static int max_topn;            /* maximum displayable processes */
  88
  89 /* miscellaneous things */
  90 struct process_select ps;
  91 char *myname = "top";
  92 jmp_buf jmp_int;
  93
  94 /* routines that don't return int */
  95
  96 char *username();
  97 char *ctime();
  98 char *kill_procs();
  99 char *renice_procs();
 100
 101 #ifdef ORDER
 102 extern int (*compares[])();
 103 #else
 104 extern int proc_compare();
 105 extern int io_compare();
 106 #endif
 107 time_t time();
 108
 109 caddr_t get_process_info();
 110
 111 /* different routines for displaying the user's identification */
 112 /* (values assigned to get_userid) */
 113 char *username();
 114 char *itoa7();
 115
 116 /* display routines that need to be predeclared */
 117 int i_loadave();
 118 int u_loadave();
 119 int i_procstates();
 120 int u_procstates();
 121 int i_cpustates();
 122 int u_cpustates();
 123 int i_memory();
 124 int u_memory();
 125 int i_swap();
 126 int u_swap();
 127 int i_message();
 128 int u_message();
 129 int i_header();
 130 int u_header();
 131 int i_process();
 132 int u_process();
 133
 134 /* pointers to display routines */
 135 int (*d_loadave)() = i_loadave;
 136 int (*d_procstates)() = i_procstates;
 137 int (*d_cpustates)() = i_cpustates;
 138 int (*d_memory)() = i_memory;
 139 int (*d_swap)() = i_swap;
 140 int (*d_message)() = i_message;
 141 int (*d_header)() = i_header;
 142 int (*d_process)() = i_process;
 143
 144
 145 main(argc, argv)
 146
 147 int  argc;
 148 char *argv[];
 149
 150 {
 151     register int i;
 152     register int active_procs;
 153     register int change;
 154
 155     struct system_info system_info;
 156     struct statics statics;
 157     caddr_t processes;
 158
 159     static char tempbuf1[50];
 160     static char tempbuf2[50];
 161     int old_sigmask;            /* only used for BSD-style signals */
 162     int topn = Default_TOPN;
 163     int delay = Default_DELAY;
 164     int displays = 0;           /* indicates unspecified */
 165     int sel_ret = 0;
 166     time_t curr_time;
 167     char *(*get_userid)() = username;
 168     char *uname_field = "USERNAME";
 169     char *header_text;
 170     char *env_top;
 171     char **preset_argv;
 172     int  preset_argc = 0;
 173     char **av;
 174     int  ac;
 175     char dostates = No;
 176     char do_unames = Yes;
 177     char interactive = Maybe;
 178     char warnings = 0;
 179 #if Default_TOPN == Infinity
 180     char topn_specified = No;
 181 #endif
 182     char ch;
 183     char *iptr;
 184     char no_command = 1;
 185     struct timeval timeout;
 186 #ifdef ORDER
 187     char *order_name = NULL;
 188     int order_index = 0;
 189 #endif
 190 #ifndef FD_SET
 191     /* FD_SET and friends are not present:  fake it */
 192     typedef int fd_set;
 193 #define FD_ZERO(x)     (*(x) = 0)
 194 #define FD_SET(f, x)   (*(x) = 1<<f)
 195 #endif
 196     fd_set readfds;
 197
 198 #ifdef ORDER
 199     static char command_chars[] = "\f qh?en#sdkriIutHmSCajo";
 200 #else
 201     static char command_chars[] = "\f qh?en#sdkriIutHmSCaj";
 202 #endif
 203 /* these defines enumerate the "strchr"s of the commands in command_chars */
 204 #define CMD_redraw      0
 205 #define CMD_update      1
 206 #define CMD_quit        2
 207 #define CMD_help1       3
 208 #define CMD_help2       4
 209 #define CMD_OSLIMIT     4    /* terminals with OS can only handle commands */
 210 #define CMD_errors      5    /* less than or equal to CMD_OSLIMIT          */
 211 #define CMD_number1     6
 212 #define CMD_number2     7
 213 #define CMD_delay       8
 214 #define CMD_displays    9
 215 #define CMD_kill        10
 216 #define CMD_renice      11
 217 #define CMD_idletog     12
 218 #define CMD_idletog2    13
 219 #define CMD_user        14
 220 #define CMD_selftog     15
 221 #define CMD_thrtog      16
 222 #define CMD_viewtog     17
 223 #define CMD_viewsys     18
 224 #define CMD_wcputog     19
 225 #define CMD_showargs    20
 226 #define CMD_jidtog      21
 227 #ifdef ORDER
 228 #define CMD_order       22
 229 #endif
 230
 231     /* set the buffer for stdout */
 232 #ifdef DEBUG
 233     extern FILE *debug;
 234     debug = fopen("debug.run", "w");
 235     setbuffer(stdout, NULL, 0);
 236 #else
 237     setbuffer(stdout, stdoutbuf, Buffersize);
 238 #endif
 239
 240     /* get our name */
 241     if (argc > 0)
 242     {
 243         if ((myname = strrchr(argv[0], '/')) == 0)
 244         {
 245             myname = argv[0];
 246         }
 247         else
 248         {
 249             myname++;
 250         }
 251     }
 252
 253     /* initialize some selection options */
 254     ps.idle    = Yes;
 255     ps.self    = -1;
 256     ps.system  = No;
 257     ps.uid     = -1;
 258     ps.thread  = No;
 259     ps.wcpu    = 1;
 260     ps.jail    = No;
 261     ps.command = NULL;
 262
 263     /* get preset options from the environment */
 264     if ((env_top = getenv("TOP")) != NULL)
 265     {
 266         av = preset_argv = argparse(env_top, &preset_argc);
 267         ac = preset_argc;
 268
 269         /* set the dummy argument to an explanatory message, in case
 270            getopt encounters a bad argument */
 271         preset_argv[0] = "while processing environment";
 272     }
 273
 274     /* process options */
 275     do {
 276         /* if we're done doing the presets, then process the real arguments */
 277         if (preset_argc == 0)
 278         {
 279             ac = argc;
 280             av = argv;
 281
 282             /* this should keep getopt happy... */
 283             optind = 1;
 284         }
 285
 286         while ((i = getopt(ac, av, "CSIHPabijnquvs:d:U:m:o:t")) != EOF)
 287         {
 288             switch(i)
 289             {
 290               case 'v':                 /* show version number */
 291                 fprintf(stderr, "%s: version %s\n",
 292                         myname, version_string());
 293                 exit(1);
 294                 break;
 295
 296               case 'u':                 /* toggle uid/username display */
 297                 do_unames = !do_unames;
 298                 break;
 299
 300               case 'U':                 /* display only username's processes */
 301                 if ((ps.uid = userid(optarg)) == -1)
 302                 {
 303                     fprintf(stderr, "%s: unknown user\n", optarg);
 304                     exit(1);
 305                 }
 306                 break;
 307
 308               case 'S':                 /* show system processes */
 309                 ps.system = !ps.system;
 310                 break;
 311
 312               case 'I':                   /* show idle processes */
 313                 ps.idle = !ps.idle;
 314                 break;
 315
 316               case 'i':                 /* go interactive regardless */
 317                 interactive = Yes;
 318                 break;
 319
 320               case 'n':                 /* batch, or non-interactive */
 321               case 'b':
 322                 interactive = No;
 323                 break;
 324
 325               case 'a':
 326                 fmt_flags ^= FMT_SHOWARGS;
 327                 break;
 328
 329               case 'd':                 /* number of displays to show */
 330                 if ((i = atoiwi(optarg)) == Invalid || i == 0)
 331                 {
 332                     fprintf(stderr,
 333                         "%s: warning: display count should be positive -- option ignored\n",
 334                         myname);
 335                     warnings++;
 336                 }
 337                 else
 338                 {
 339                     displays = i;
 340                 }
 341                 break;
 342
 343               case 's':
 344                 if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
 345                 {
 346                     fprintf(stderr,
 347                         "%s: warning: seconds delay should be positive -- using default\n",
 348                         myname);
 349                     delay = Default_DELAY;
 350                     warnings++;
 351                 }
 352                 break;
 353
 354               case 'q':         /* be quick about it */
 355                 /* only allow this if user is really root */
 356                 if (getuid() == 0)
 357                 {
 358                     /* be very un-nice! */
 359                     (void) nice(-20);
 360                 }
 361                 else
 362                 {
 363                     fprintf(stderr,
 364                         "%s: warning: `-q' option can only be used by root\n",
 365                         myname);
 366                     warnings++;
 367                 }
 368                 break;
 369
 370               case 'm':         /* select display mode */
 371                 if (strcmp(optarg, "io") == 0) {
 372                         displaymode = DISP_IO;
 373                 } else if (strcmp(optarg, "cpu") == 0) {
 374                         displaymode = DISP_CPU;
 375                 } else {
 376                         fprintf(stderr,
 377                         "%s: warning: `-m' option can only take args "
 378                         "'io' or 'cpu'\n",
 379                         myname);
 380                         exit(1);
 381                 }
 382                 break;
 383
 384               case 'o':         /* select sort order */
 385 #ifdef ORDER
 386                 order_name = optarg;
 387 #else
 388                 fprintf(stderr,
 389                         "%s: this platform does not support arbitrary ordering.  Sorry.\n",
 390                         myname);
 391                 warnings++;
 392 #endif
 393                 break;
 394
 395               case 't':
 396                 ps.self = (ps.self == -1) ? getpid() : -1;
 397                 break;
 398
 399               case 'C':
 400                 ps.wcpu = !ps.wcpu;
 401                 break;
 402
 403               case 'H':
 404                 ps.thread = !ps.thread;
 405                 break;
 406
 407               case 'j':
 408                 ps.jail = !ps.jail;
 409                 break;
 410
 411               case 'P':
 412                 pcpu_stats = Yes;
 413                 break;
 414
 415               default:
 416                 fprintf(stderr,
 417 "Top version %s\n"
 418 "Usage: %s [-abCHIijnPqStuv] [-d count] [-m io | cpu] [-o field] [-s time]\n"
 419 "       [-U username] [number]\n",
 420                         version_string(), myname);
 421                 exit(1);
 422             }
 423         }
 424
 425         /* get count of top processes to display (if any) */
 426         if (optind < ac)
 427         {
 428             if ((topn = atoiwi(av[optind])) == Invalid)
 429             {
 430                 fprintf(stderr,
 431                         "%s: warning: process display count should be non-negative -- using default\n",
 432                         myname);
 433                 warnings++;
 434             }
 435 #if Default_TOPN == Infinity
 436             else
 437             {
 438                 topn_specified = Yes;
 439             }
 440 #endif
 441         }
 442
 443         /* tricky:  remember old value of preset_argc & set preset_argc = 0 */
 444         i = preset_argc;
 445         preset_argc = 0;
 446
 447     /* repeat only if we really did the preset arguments */
 448     } while (i != 0);
 449
 450     /* set constants for username/uid display correctly */
 451     if (!do_unames)
 452     {
 453         uname_field = "   UID  ";
 454         get_userid = itoa7;
 455     }
 456
 457     /* initialize the kernel memory interface */
 458     if (machine_init(&statics, do_unames) == -1)
 459     {
 460         exit(1);
 461     }
 462
 463 #ifdef ORDER
 464     /* determine sorting order index, if necessary */
 465     if (order_name != NULL)
 466     {
 467         if ((order_index = string_index(order_name, statics.order_names)) == -1)
 468         {
 469             char **pp;
 470
 471             fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
 472                     myname, order_name);
 473             fprintf(stderr, "\tTry one of these:");
 474             pp = statics.order_names;
 475             while (*pp != NULL)
 476             {
 477                 fprintf(stderr, " %s", *pp++);
 478             }
 479             fputc('\n', stderr);
 480             exit(1);
 481         }
 482     }
 483 #endif
 484
 485 #ifdef no_initialization_needed
 486     /* initialize the hashing stuff */
 487     if (do_unames)
 488     {
 489         init_hash();
 490     }
 491 #endif
 492
 493     /* initialize termcap */
 494     init_termcap(interactive);
 495
 496     /* get the string to use for the process area header */
 497     header_text = format_header(uname_field);
 498
 499     /* initialize display interface */
 500     if ((max_topn = display_init(&statics)) == -1)
 501     {
 502         fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
 503         exit(4);
 504     }
 505
 506     /* print warning if user requested more processes than we can display */
 507     if (topn > max_topn)
 508     {
 509         fprintf(stderr,
 510                 "%s: warning: this terminal can only display %d processes.\n",
 511                 myname, max_topn);
 512         warnings++;
 513     }
 514
 515     /* adjust for topn == Infinity */
 516     if (topn == Infinity)
 517     {
 518         /*
 519          *  For smart terminals, infinity really means everything that can
 520          *  be displayed, or Largest.
 521          *  On dumb terminals, infinity means every process in the system!
 522          *  We only really want to do that if it was explicitly specified.
 523          *  This is always the case when "Default_TOPN != Infinity".  But if
 524          *  topn wasn't explicitly specified and we are on a dumb terminal
 525          *  and the default is Infinity, then (and only then) we use
 526          *  "Nominal_TOPN" instead.
 527          */
 528 #if Default_TOPN == Infinity
 529         topn = smart_terminal ? Largest :
 530                     (topn_specified ? Largest : Nominal_TOPN);
 531 #else
 532         topn = Largest;
 533 #endif
 534     }
 535
 536     /* set header display accordingly */
 537     display_header(topn > 0);
 538
 539     /* determine interactive state */
 540     if (interactive == Maybe)
 541     {
 542         interactive = smart_terminal;
 543     }
 544
 545     /* if # of displays not specified, fill it in */
 546     if (displays == 0)
 547     {
 548         displays = smart_terminal ? Infinity : 1;
 549     }
 550
 551     /* hold interrupt signals while setting up the screen and the handlers */
 552 #ifdef SIGHOLD
 553     sighold(SIGINT);
 554     sighold(SIGQUIT);
 555     sighold(SIGTSTP);
 556 #else
 557     old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
 558 #endif
 559     init_screen();
 560     (void) signal(SIGINT, leave);
 561     (void) signal(SIGQUIT, leave);
 562     (void) signal(SIGTSTP, tstop);
 563 #ifdef SIGWINCH
 564     (void) signal(SIGWINCH, winch);
 565 #endif
 566 #ifdef SIGRELSE
 567     sigrelse(SIGINT);
 568     sigrelse(SIGQUIT);
 569     sigrelse(SIGTSTP);
 570 #else
 571     (void) sigsetmask(old_sigmask);
 572 #endif
 573     if (warnings)
 574     {
 575         fputs("....", stderr);
 576         fflush(stderr);                 /* why must I do this? */
 577         sleep((unsigned)(3 * warnings));
 578         fputc('\n', stderr);
 579     }
 580
 581 restart:
 582
 583     /*
 584      *  main loop -- repeat while display count is positive or while it
 585      *          indicates infinity (by being -1)
 586      */
 587
 588     while ((displays == -1) || (displays-- > 0))
 589     {
 590         int (*compare)();
 591
 592
 593         /* get the current stats */
 594         get_system_info(&system_info);
 595
 596 #ifdef ORDER
 597         compare = compares[order_index];
 598 #else
 599         if (displaymode == DISP_CPU)
 600                 compare = proc_compare;
 601         else
 602                 compare = io_compare;
 603 #endif
 604
 605         /* get the current set of processes */
 606         processes =
 607                 get_process_info(&system_info, &ps, compare);
 608
 609         /* display the load averages */
 610         (*d_loadave)(system_info.last_pid,
 611                      system_info.load_avg);
 612
 613         /* display the current time */
 614         /* this method of getting the time SHOULD be fairly portable */
 615         time(&curr_time);
 616         i_uptime(&system_info.boottime, &curr_time);
 617         i_timeofday(&curr_time);
 618
 619         /* display process state breakdown */
 620         (*d_procstates)(system_info.p_total,
 621                         system_info.procstates);
 622
 623         /* display the cpu state percentage breakdown */
 624         if (dostates)   /* but not the first time */
 625         {
 626             (*d_cpustates)(system_info.cpustates);
 627         }
 628         else
 629         {
 630             /* we'll do it next time */
 631             if (smart_terminal)
 632             {
 633                 z_cpustates();
 634             }
 635             else
 636             {
 637                 putchar('\n');
 638             }
 639             dostates = Yes;
 640         }
 641
 642         /* display memory stats */
 643         (*d_memory)(system_info.memory);
 644
 645         /* display swap stats */
 646         (*d_swap)(system_info.swap);
 647
 648         /* handle message area */
 649         (*d_message)();
 650
 651         /* update the header area */
 652         (*d_header)(header_text);
 653
 654         if (topn > 0)
 655         {
 656             /* determine number of processes to actually display */
 657             /* this number will be the smallest of:  active processes,
 658                number user requested, number current screen accomodates */
 659             active_procs = system_info.P_ACTIVE;
 660             if (active_procs > topn)
 661             {
 662                 active_procs = topn;
 663             }
 664             if (active_procs > max_topn)
 665             {
 666                 active_procs = max_topn;
 667             }
 668
 669             /* now show the top "n" processes. */
 670             for (i = 0; i < active_procs; i++)
 671             {
 672                 (*d_process)(i, format_next_process(processes, get_userid,
 673                              fmt_flags));
 674             }
 675         }
 676         else
 677         {
 678             i = 0;
 679         }
 680
 681         /* do end-screen processing */
 682         u_endscreen(i);
 683
 684         /* now, flush the output buffer */
 685         if (fflush(stdout) != 0)
 686         {
 687             new_message(MT_standout, " Write error on stdout");
 688             putchar('\r');
 689             quit(1);
 690             /*NOTREACHED*/
 691         }
 692
 693         /* only do the rest if we have more displays to show */
 694         if (displays)
 695         {
 696             /* switch out for new display on smart terminals */
 697             if (smart_terminal)
 698             {
 699                 if (overstrike)
 700                 {
 701                     reset_display();
 702                 }
 703                 else
 704                 {
 705                     d_loadave = u_loadave;
 706                     d_procstates = u_procstates;
 707                     d_cpustates = u_cpustates;
 708                     d_memory = u_memory;
 709                     d_swap = u_swap;
 710                     d_message = u_message;
 711                     d_header = u_header;
 712                     d_process = u_process;
 713                 }
 714             }
 715
 716             no_command = Yes;
 717             if (!interactive)
 718             {
 719                 /* set up alarm */
 720                 (void) signal(SIGALRM, onalrm);
 721                 (void) alarm((unsigned)delay);
 722
 723                 /* wait for the rest of it .... */
 724                 pause();
 725             }
 726             else while (no_command)
 727             {
 728                 /* assume valid command unless told otherwise */
 729                 no_command = No;
 730
 731                 /* set up arguments for select with timeout */
 732                 FD_ZERO(&readfds);
 733                 FD_SET(0, &readfds);            /* for standard input */
 734                 timeout.tv_sec  = delay;
 735                 timeout.tv_usec = 0;
 736
 737                 if (leaveflag) {
 738                     end_screen();
 739                     exit(0);
 740                 }
 741
 742                 if (tstopflag) {
 743                     /* move to the lower left */
 744                     end_screen();
 745                     fflush(stdout);
 746
 747                     /* default the signal handler action */
 748                     (void) signal(SIGTSTP, SIG_DFL);
 749
 750                     /* unblock the signal and send ourselves one */
 751 #ifdef SIGRELSE
 752                     sigrelse(SIGTSTP);
 753 #else
 754                     (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
 755 #endif
 756                     (void) kill(0, SIGTSTP);
 757
 758                     /* reset the signal handler */
 759                     (void) signal(SIGTSTP, tstop);
 760
 761                     /* reinit screen */
 762                     reinit_screen();
 763                     reset_display();
 764                     tstopflag = 0;
 765                     goto restart;
 766                 }
 767
 768                 if (winchflag) {
 769                     /* reascertain the screen dimensions */
 770                     get_screensize();
 771
 772                     /* tell display to resize */
 773                     max_topn = display_resize();
 774
 775                     /* reset the signal handler */
 776                     (void) signal(SIGWINCH, winch);
 777
 778                     reset_display();
 779                     winchflag = 0;
 780                     goto restart;
 781                 }
 782
 783                 /* wait for either input or the end of the delay period */
 784                 sel_ret = select(2, &readfds, NULL, NULL, &timeout);
 785                 if (sel_ret < 0 && errno != EINTR)
 786                     quit(0);
 787                 if (sel_ret > 0)
 788                 {
 789                     int newval;
 790                     char *errmsg;
 791
 792                     /* something to read -- clear the message area first */
 793                     clear_message();
 794
 795                     /* now read it and convert to command strchr */
 796                     /* (use "change" as a temporary to hold strchr) */
 797                     if (read(0, &ch, 1) != 1)
 798                     {
 799                         /* read error: either 0 or -1 */
 800                         new_message(MT_standout, " Read error on stdin");
 801                         putchar('\r');
 802                         quit(1);
 803                         /*NOTREACHED*/
 804                     }
 805                     if ((iptr = strchr(command_chars, ch)) == NULL)
 806                     {
 807                         if (ch != '\r' && ch != '\n')
 808                         {
 809                             /* illegal command */
 810                             new_message(MT_standout, " Command not understood");
 811                         }
 812                         putchar('\r');
 813                         no_command = Yes;
 814                     }
 815                     else
 816                     {
 817                         change = iptr - command_chars;
 818                         if (overstrike && change > CMD_OSLIMIT)
 819                         {
 820                             /* error */
 821                             new_message(MT_standout,
 822                             " Command cannot be handled by this terminal");
 823                             putchar('\r');
 824                             no_command = Yes;
 825                         }
 826                         else switch(change)
 827                         {
 828                             case CMD_redraw:    /* redraw screen */
 829                                 reset_display();
 830                                 break;
 831
 832                             case CMD_update:    /* merely update display */
 833                                 /* is the load average high? */
 834                                 if (system_info.load_avg[0] > LoadMax)
 835                                 {
 836                                     /* yes, go home for visual feedback */
 837                                     go_home();
 838                                     fflush(stdout);
 839                                 }
 840                                 break;
 841
 842                             case CMD_quit:      /* quit */
 843                                 quit(0);
 844                                 /*NOTREACHED*/
 845                                 break;
 846
 847                             case CMD_help1:     /* help */
 848                             case CMD_help2:
 849                                 reset_display();
 850                                 clear();
 851                                 show_help();
 852                                 standout("Hit any key to continue: ");
 853                                 fflush(stdout);
 854                                 (void) read(0, &ch, 1);
 855                                 break;
 856
 857                             case CMD_errors:    /* show errors */
 858                                 if (error_count() == 0)
 859                                 {
 860                                     new_message(MT_standout,
 861                                         " Currently no errors to report.");
 862                                     putchar('\r');
 863                                     no_command = Yes;
 864                                 }
 865                                 else
 866                                 {
 867                                     reset_display();
 868                                     clear();
 869                                     show_errors();
 870                                     standout("Hit any key to continue: ");
 871                                     fflush(stdout);
 872                                     (void) read(0, &ch, 1);
 873                                 }
 874                                 break;
 875
 876                             case CMD_number1:   /* new number */
 877                             case CMD_number2:
 878                                 new_message(MT_standout,
 879                                     "Number of processes to show: ");
 880                                 newval = readline(tempbuf1, 8, Yes);
 881                                 if (newval > -1)
 882                                 {
 883                                     if (newval > max_topn)
 884                                     {
 885                                         new_message(MT_standout | MT_delayed,
 886                                           " This terminal can only display %d processes.",
 887                                           max_topn);
 888                                         putchar('\r');
 889                                     }
 890
 891                                     if (newval == 0)
 892                                     {
 893                                         /* inhibit the header */
 894                                         display_header(No);
 895                                     }
 896                                     else if (newval > topn && topn == 0)
 897                                     {
 898                                         /* redraw the header */
 899                                         display_header(Yes);
 900                                         d_header = i_header;
 901                                     }
 902                                     topn = newval;
 903                                 }
 904                                 break;
 905
 906                             case CMD_delay:     /* new seconds delay */
 907                                 new_message(MT_standout, "Seconds to delay: ");
 908                                 if ((i = readline(tempbuf1, 8, Yes)) > -1)
 909                                 {
 910                                     if ((delay = i) == 0 && getuid() != 0)
 911                                     {
 912                                         delay = 1;
 913                                     }
 914                                 }
 915                                 clear_message();
 916                                 break;
 917
 918                             case CMD_displays:  /* change display count */
 919                                 new_message(MT_standout,
 920                                         "Displays to show (currently %s): ",
 921                                         displays == -1 ? "infinite" :
 922                                                          itoa(displays));
 923                                 if ((i = readline(tempbuf1, 10, Yes)) > 0)
 924                                 {
 925                                     displays = i;
 926                                 }
 927                                 else if (i == 0)
 928                                 {
 929                                     quit(0);
 930                                 }
 931                                 clear_message();
 932                                 break;
 933
 934                             case CMD_kill:      /* kill program */
 935                                 new_message(0, "kill ");
 936                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 937                                 {
 938                                     if ((errmsg = kill_procs(tempbuf2)) != NULL)
 939                                     {
 940                                         new_message(MT_standout, "%s", errmsg);
 941                                         putchar('\r');
 942                                         no_command = Yes;
 943                                     }
 944                                 }
 945                                 else
 946                                 {
 947                                     clear_message();
 948                                 }
 949                                 break;
 950
 951                             case CMD_renice:    /* renice program */
 952                                 new_message(0, "renice ");
 953                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 954                                 {
 955                                     if ((errmsg = renice_procs(tempbuf2)) != NULL)
 956                                     {
 957                                         new_message(MT_standout, "%s", errmsg);
 958                                         putchar('\r');
 959                                         no_command = Yes;
 960                                     }
 961                                 }
 962                                 else
 963                                 {
 964                                     clear_message();
 965                                 }
 966                                 break;
 967
 968                             case CMD_idletog:
 969                             case CMD_idletog2:
 970                                 ps.idle = !ps.idle;
 971                                 new_message(MT_standout | MT_delayed,
 972                                     " %sisplaying idle processes.",
 973                                     ps.idle ? "D" : "Not d");
 974                                 putchar('\r');
 975                                 break;
 976
 977                             case CMD_selftog:
 978                                 ps.self = (ps.self == -1) ? getpid() : -1;
 979                                 new_message(MT_standout | MT_delayed,
 980                                     " %sisplaying self.",
 981                                     (ps.self == -1) ? "D" : "Not d");
 982                                 putchar('\r');
 983                                 break;
 984
 985                             case CMD_user:
 986                                 new_message(MT_standout,
 987                                     "Username to show: ");
 988                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 989                                 {
 990                                     if (tempbuf2[0] == '+' &&
 991                                         tempbuf2[1] == '\0')
 992                                     {
 993                                         ps.uid = -1;
 994                                     }
 995                                     else if ((i = userid(tempbuf2)) == -1)
 996                                     {
 997                                         new_message(MT_standout,
 998                                             " %s: unknown user", tempbuf2);
 999                                         no_command = Yes;
1000                                     }
1001                                     else
1002                                     {
1003                                         ps.uid = i;
1004                                     }
1005                                     putchar('\r');
1006                                 }
1007                                 else
1008                                 {
1009                                     clear_message();
1010                                 }
1011                                 break;
1012
1013                             case CMD_thrtog:
1014                                 ps.thread = !ps.thread;
1015                                 new_message(MT_standout | MT_delayed,
1016                                     "Displaying threads %s",
1017                                     ps.thread ? "separately" : "as a count");
1018                                 header_text = format_header(uname_field);
1019                                 reset_display();
1020                                 putchar('\r');
1021                                 break;
1022                             case CMD_wcputog:
1023                                 ps.wcpu = !ps.wcpu;
1024                                 new_message(MT_standout | MT_delayed,
1025                                     "Displaying %sCPU",
1026                                     ps.wcpu ? "W" : "");
1027                                 header_text = format_header(uname_field);
1028                                 reset_display();
1029                                 putchar('\r');
1030                                 break;
1031                             case CMD_viewtog:
1032                                 if (++displaymode == DISP_MAX)
1033                                         displaymode = 0;
1034                                 header_text = format_header(uname_field);
1035                                 display_header(Yes);
1036                                 d_header = i_header;
1037                                 reset_display();
1038                                 break;
1039                             case CMD_viewsys:
1040                                 ps.system = !ps.system;
1041                                 break;
1042                             case CMD_showargs:
1043                                 fmt_flags ^= FMT_SHOWARGS;
1044                                 break;
1045 #ifdef ORDER
1046                             case CMD_order:
1047                                 new_message(MT_standout,
1048                                     "Order to sort: ");
1049                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1050                                 {
1051                                   if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1052                                         {
1053                                           new_message(MT_standout,
1054                                               " %s: unrecognized sorting order", tempbuf2);
1055                                           no_command = Yes;
1056                                     }
1057                                     else
1058                                     {
1059                                         order_index = i;
1060                                     }
1061                                     putchar('\r');
1062                                 }
1063                                 else
1064                                 {
1065                                     clear_message();
1066                                 }
1067                                 break;
1068 #endif
1069                             case CMD_jidtog:
1070                                 ps.jail = !ps.jail;
1071                                 new_message(MT_standout | MT_delayed,
1072                                     " %sisplaying jail ID.",
1073                                     ps.jail ? "D" : "Not d");
1074                                 header_text = format_header(uname_field);
1075                                 reset_display();
1076                                 putchar('\r');
1077                                 break;
1078
1079                             default:
1080                                 new_message(MT_standout, " BAD CASE IN SWITCH!");
1081                                 putchar('\r');
1082                         }
1083                     }
1084
1085                     /* flush out stuff that may have been written */
1086                     fflush(stdout);
1087                 }
1088             }
1089         }
1090     }
1091
1092 #ifdef DEBUG
1093     fclose(debug);
1094 #endif
1095     quit(0);
1096     /*NOTREACHED*/
1097 }
1098
1099 /*
1100  *  reset_display() - reset all the display routine pointers so that entire
1101  *      screen will get redrawn.
1102  */
1103
1104 reset_display()
1105
1106 {
1107     d_loadave    = i_loadave;
1108     d_procstates = i_procstates;
1109     d_cpustates  = i_cpustates;
1110     d_memory     = i_memory;
1111     d_swap       = i_swap;
1112     d_message    = i_message;
1113     d_header     = i_header;
1114     d_process    = i_process;
1115 }
1116
1117 /*
1118  *  signal handlers
1119  */
1120
1121 sigret_t leave()        /* exit under normal conditions -- INT handler */
1122
1123 {
1124     leaveflag = 1;
1125 }
1126
1127 sigret_t tstop(i)       /* SIGTSTP handler */
1128
1129 int i;
1130
1131 {
1132     tstopflag = 1;
1133 }
1134
1135 #ifdef SIGWINCH
1136 sigret_t winch(i)               /* SIGWINCH handler */
1137
1138 int i;
1139
1140 {
1141     winchflag = 1;
1142 }
1143 #endif
1144
1145 void quit(status)               /* exit under duress */
1146
1147 int status;
1148
1149 {
1150     end_screen();
1151     exit(status);
1152     /*NOTREACHED*/
1153 }
1154
1155 sigret_t onalrm()       /* SIGALRM handler */
1156
1157 {
1158     /* this is only used in batch mode to break out of the pause() */
1159     /* return; */
1160 }
1161