contrib/top/top.c

   1 const 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 1.4 2006/10/03 12:20:11 y0netan1 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 <time.h>
  40 #include <curses.h>
  41 #include <unistd.h>
  42 #include <signal.h>
  43 #include <setjmp.h>
  44 #include <ctype.h>
  45 #include <sys/time.h>
  46
  47 /* includes specific to top */
  48 #include "display.h"            /* interface to display package */
  49 #include "screen.h"             /* interface to screen package */
  50 #include "top.h"
  51 #include "top.local.h"
  52 #include "boolean.h"
  53 #include "machine.h"
  54 #include "username.h"
  55 #include "commands.h"
  56 #include "utils.h"
  57
  58 /* Size of the stdio buffer given to stdout */
  59 #define Buffersize      2048
  60
  61 /* The buffer that stdio will use */
  62 char stdoutbuf[Buffersize];
  63
  64 /* build Signal masks */
  65 #define Smask(s)        (1 << ((s) - 1))
  66
  67 /* for getopt: */
  68 extern int  optind;
  69 extern char *optarg;
  70
  71 /* imported from screen.c */
  72 extern int overstrike;
  73
  74 /* signal handling routines */
  75 sigret_t leave(int signo);
  76 sigret_t onalrm(int signo);
  77 sigret_t tstop(int signo);
  78 #ifdef SIGWINCH
  79 sigret_t mywinch(int signo);
  80 #endif
  81
  82 volatile sig_atomic_t leaveflag;
  83 volatile sig_atomic_t tstopflag;
  84 volatile sig_atomic_t winchflag;
  85
  86 /* internal routines */
  87 void quit(int signo);
  88
  89 /* values which need to be accessed by signal handlers */
  90 static int max_topn;            /* maximum displayable processes */
  91
  92 static void reset_display(void);
  93
  94 /* miscellaneous things */
  95 const char *myname = "top";
  96 jmp_buf jmp_int;
  97
  98 #ifdef ORDER
  99 extern int (*proc_compares[])(const void *, const void *);
 100 #else
 101 extern int proc_compare(const void *, const void *);
 102 #endif
 103
 104 /* pointers to display routines */
 105 void (*d_loadave)(int, double *) = i_loadave;
 106 void (*d_procstates)(int, int *) = i_procstates;
 107 void (*d_cpustates)(struct system_info *) = i_cpustates;
 108 void (*d_memory)(int *) = i_memory;
 109 void (*d_swap)(int *) = i_swap;
 110 void (*d_message)(void) = i_message;
 111 void (*d_header)(char *) = i_header;
 112 void (*d_process)(int, char *) = i_process;
 113
 114 int n_cpus = 0;
 115
 116 int
 117 main(int argc, char **argv)
 118 {
 119     int i;
 120     int active_procs;
 121     int change;
 122
 123     struct system_info system_info;
 124     struct statics statics;
 125     caddr_t processes;
 126
 127     static char tempbuf1[50];
 128     static char tempbuf2[50];
 129     int old_sigmask;            /* only used for BSD-style signals */
 130     int topn = Default_TOPN;
 131     int delay = Default_DELAY;
 132     int displays = 0;           /* indicates unspecified */
 133     int sel_ret = 0;
 134     time_t curr_time;
 135     char *(*get_userid)(long) = username;
 136     const char *uname_field = "USERNAME";
 137     char *header_text;
 138     char *env_top;
 139     char **preset_argv;
 140     int  preset_argc = 0;
 141     char **av;
 142     int  ac;
 143     char dostates = No;
 144     char do_unames = Yes;
 145     char interactive = Maybe;
 146     char warnings = 0;
 147 #if Default_TOPN == Infinity
 148     char topn_specified = No;
 149 #endif
 150     char ch;
 151     char *iptr;
 152     char no_command = 1;
 153     struct timeval mytimeout;
 154     struct process_select ps;
 155 #ifdef ORDER
 156     char *order_name = NULL;
 157     int order_index = 0;
 158 #endif
 159 #ifndef FD_SET
 160     /* FD_SET and friends are not present:  fake it */
 161     typedef int fd_set;
 162 #define FD_ZERO(x)     (*(x) = 0)
 163 #define FD_SET(f, x)   (*(x) = 1<<f)
 164 #endif
 165     fd_set readfds;
 166
 167 #ifdef ORDER
 168     static char command_chars[] = "\f qh?en#sdkriIutTOSo";
 169 #else
 170     static char command_chars[] = "\f qh?en#sdkriIutTOSO";
 171 #endif
 172 /* these defines enumerate the "strchr"s of the commands in command_chars */
 173 #define CMD_redraw      0
 174 #define CMD_update      1
 175 #define CMD_quit        2
 176 #define CMD_help1       3
 177 #define CMD_help2       4
 178 #define CMD_OSLIMIT     4    /* terminals with OS can only handle commands */
 179 #define CMD_errors      5    /* less than or equal to CMD_OSLIMIT          */
 180 #define CMD_number1     6
 181 #define CMD_number2     7
 182 #define CMD_delay       8
 183 #define CMD_displays    9
 184 #define CMD_kill        10
 185 #define CMD_renice      11
 186 #define CMD_idletog     12
 187 #define CMD_idletog2    13
 188 #define CMD_user        14
 189 #define CMD_selftog     15
 190 #define CMD_threads     16
 191 #define CMD_othreads    17
 192 #define CMD_system      18
 193 #ifdef ORDER
 194 #define CMD_order       19
 195 #endif
 196
 197     /* set the buffer for stdout */
 198 #ifdef DEBUG
 199     extern FILE *debug;
 200     debug = fopen("debug.run", "w");
 201     setbuffer(stdout, NULL, 0);
 202 #else
 203     setbuffer(stdout, stdoutbuf, Buffersize);
 204 #endif
 205
 206     /* get our name */
 207     if (argc > 0)
 208     {
 209         if ((myname = strrchr(argv[0], '/')) == 0)
 210         {
 211             myname = argv[0];
 212         }
 213         else
 214         {
 215             myname++;
 216         }
 217     }
 218
 219     /* initialize some selection options */
 220     ps.idle    = Yes;
 221     ps.self    = -1;
 222     ps.system  = No;
 223     ps.threads = No;
 224     ps.only_threads = No;
 225     ps.uid     = -1;
 226     ps.command = NULL;
 227
 228     /* get preset options from the environment */
 229     if ((env_top = getenv("TOP")) != NULL)
 230     {
 231         av = preset_argv = argparse(env_top, &preset_argc);
 232         ac = preset_argc;
 233
 234         /* set the dummy argument to an explanatory message, in case
 235            getopt encounters a bad argument */
 236         preset_argv[0] = strdup("while processing environment");
 237     }
 238
 239     /* process options */
 240     do {
 241         /* if we're done doing the presets, then process the real arguments */
 242         if (preset_argc == 0)
 243         {
 244             ac = argc;
 245             av = argv;
 246
 247             /* this should keep getopt happy... */
 248             optind = 1;
 249         }
 250
 251         while ((i = getopt(ac, av, "SITONbinquvs:d:U:o:t")) != EOF)
 252         {
 253             switch(i)
 254             {
 255               case 'v':                 /* show version number */
 256                 fprintf(stderr, "%s: version %s\n",
 257                         myname, version_string());
 258                 exit(1);
 259                 break;
 260
 261               case 'u':                 /* toggle uid/username display */
 262                 do_unames = !do_unames;
 263                 break;
 264
 265               case 'U':                 /* display only username's processes */
 266                 if ((ps.uid = userid(optarg)) == -1)
 267                 {
 268                     fprintf(stderr, "%s: unknown user\n", optarg);
 269                     exit(1);
 270                 }
 271                 break;
 272
 273               case 'S':                 /* show system processes */
 274                 ps.system = !ps.system;
 275                 break;
 276
 277               case 'I':                   /* show idle processes */
 278                 ps.idle = !ps.idle;
 279                 break;
 280
 281               case 'O':
 282                 ps.only_threads = !ps.only_threads; /* only threads */
 283                 break;
 284
 285               case 'T':
 286                 ps.threads = !ps.threads;       /* show threads */
 287                 break;
 288
 289               case 'i':                 /* go interactive regardless */
 290                 interactive = Yes;
 291                 break;
 292
 293               case 'n':                 /* batch, or non-interactive */
 294               case 'b':
 295                 interactive = No;
 296                 break;
 297
 298               case 'd':                 /* number of displays to show */
 299                 if ((i = atoiwi(optarg)) == Invalid || i == 0)
 300                 {
 301                     fprintf(stderr,
 302                         "%s: warning: display count should be positive -- option ignored\n",
 303                         myname);
 304                     warnings++;
 305                 }
 306                 else
 307                 {
 308                     displays = i;
 309                 }
 310                 break;
 311
 312               case 's':
 313                 if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
 314                 {
 315                     fprintf(stderr,
 316                         "%s: warning: seconds delay should be positive -- using default\n",
 317                         myname);
 318                     delay = Default_DELAY;
 319                     warnings++;
 320                 }
 321                 break;
 322
 323               case 'q':         /* be quick about it */
 324                 /* only allow this if user is really root */
 325                 if (getuid() == 0)
 326                 {
 327                     /* be very un-nice! */
 328                     (void) nice(-20);
 329                 }
 330                 else
 331                 {
 332                     fprintf(stderr,
 333                         "%s: warning: `-q' option can only be used by root\n",
 334                         myname);
 335                     warnings++;
 336                 }
 337                 break;
 338
 339               case 'o':         /* select sort order */
 340 #ifdef ORDER
 341                 order_name = optarg;
 342 #else
 343                 fprintf(stderr,
 344                         "%s: this platform does not support arbitrary ordering.  Sorry.\n",
 345                         myname);
 346                 warnings++;
 347 #endif
 348                 break;
 349
 350               case 't':
 351                 ps.self = (ps.self == -1) ? getpid() : -1;
 352                 break;
 353
 354               default:
 355                 fprintf(stderr, "\
 356 Top version %s\n\
 357 Usage: %s [-ISbinqut] [-d x] [-s x] [-o field] [-U username] [number]\n",
 358                         version_string(), myname);
 359                 exit(1);
 360             }
 361         }
 362
 363         /* get count of top processes to display (if any) */
 364         if (optind < ac)
 365         {
 366             if ((topn = atoiwi(av[optind])) == Invalid)
 367             {
 368                 fprintf(stderr,
 369                         "%s: warning: process display count should be non-negative -- using default\n",
 370                         myname);
 371                 warnings++;
 372             }
 373 #if Default_TOPN == Infinity
 374             else
 375             {
 376                 topn_specified = Yes;
 377             }
 378 #endif
 379         }
 380
 381         /* tricky:  remember old value of preset_argc & set preset_argc = 0 */
 382         i = preset_argc;
 383         preset_argc = 0;
 384
 385     /* repeat only if we really did the preset arguments */
 386     } while (i != 0);
 387
 388     /* set constants for username/uid display correctly */
 389     if (!do_unames)
 390     {
 391         uname_field = "   UID  ";
 392         get_userid = ltoa7;
 393     }
 394
 395     /* initialize the kernel memory interface */
 396     if (machine_init(&statics) == -1)
 397     {
 398         exit(1);
 399     }
 400
 401 #ifdef ORDER
 402     /* determine sorting order index, if necessary */
 403     if (order_name != NULL)
 404     {
 405         if ((order_index = string_index(order_name, statics.order_names)) == -1)
 406         {
 407             const char **pp;
 408
 409             fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
 410                     myname, order_name);
 411             fprintf(stderr, "\tTry one of these:");
 412             pp = statics.order_names;
 413             while (*pp != NULL)
 414             {
 415                 fprintf(stderr, " %s", *pp++);
 416             }
 417             fputc('\n', stderr);
 418             exit(1);
 419         }
 420     }
 421 #endif
 422
 423 #ifdef no_initialization_needed
 424     /* initialize the hashing stuff */
 425     if (do_unames)
 426     {
 427         init_hash();
 428     }
 429 #endif
 430
 431     /* initialize termcap */
 432     init_termcap(interactive);
 433
 434     /* get the string to use for the process area header */
 435     header_text = format_header(uname_field);
 436
 437     /* initialize display interface */
 438     if ((max_topn = display_init(&statics)) == -1)
 439     {
 440         fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
 441         exit(4);
 442     }
 443
 444     /* print warning if user requested more processes than we can display */
 445     if (topn > max_topn)
 446     {
 447         fprintf(stderr,
 448                 "%s: warning: this terminal can only display %d processes.\n",
 449                 myname, max_topn);
 450         warnings++;
 451     }
 452
 453     /* adjust for topn == Infinity */
 454     if (topn == Infinity)
 455     {
 456         /*
 457          *  For smart terminals, infinity really means everything that can
 458          *  be displayed, or Largest.
 459          *  On dumb terminals, infinity means every process in the system!
 460          *  We only really want to do that if it was explicitly specified.
 461          *  This is always the case when "Default_TOPN != Infinity".  But if
 462          *  topn wasn't explicitly specified and we are on a dumb terminal
 463          *  and the default is Infinity, then (and only then) we use
 464          *  "Nominal_TOPN" instead.
 465          */
 466 #if Default_TOPN == Infinity
 467         topn = smart_terminal ? Largest :
 468                     (topn_specified ? Largest : Nominal_TOPN);
 469 #else
 470         topn = Largest;
 471 #endif
 472     }
 473
 474     /* set header display accordingly */
 475     display_header(topn > 0);
 476
 477     /* determine interactive state */
 478     if (interactive == Maybe)
 479     {
 480         interactive = smart_terminal;
 481     }
 482
 483     /* if # of displays not specified, fill it in */
 484     if (displays == 0)
 485     {
 486         displays = smart_terminal ? Infinity : 1;
 487     }
 488
 489     /* hold interrupt signals while setting up the screen and the handlers */
 490 #ifdef SIGHOLD
 491     sighold(SIGINT);
 492     sighold(SIGQUIT);
 493     sighold(SIGTSTP);
 494 #else
 495     old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
 496 #endif
 497     init_screen();
 498     (void) signal(SIGINT, leave);
 499     (void) signal(SIGQUIT, leave);
 500     (void) signal(SIGTSTP, tstop);
 501 #ifdef SIGWINCH
 502     (void) signal(SIGWINCH, mywinch);
 503 #endif
 504 #ifdef SIGRELSE
 505     sigrelse(SIGINT);
 506     sigrelse(SIGQUIT);
 507     sigrelse(SIGTSTP);
 508 #else
 509     (void) sigsetmask(old_sigmask);
 510 #endif
 511     if (warnings)
 512     {
 513         fputs("....", stderr);
 514         fflush(stderr);                 /* why must I do this? */
 515         sleep((unsigned)(3 * warnings));
 516         fputc('\n', stderr);
 517     }
 518
 519 restart:
 520
 521     /*
 522      *  main loop -- repeat while display count is positive or while it
 523      *          indicates infinity (by being -1)
 524      */
 525
 526     while ((displays == -1) || (displays-- > 0))
 527     {
 528         /* get the current stats */
 529         get_system_info(&system_info);
 530
 531         /* get the current set of processes */
 532         processes =
 533                 get_process_info(&system_info,
 534                                  &ps,
 535 #ifdef ORDER
 536                                  proc_compares[order_index]);
 537 #else
 538                                  proc_compare);
 539 #endif
 540
 541         /* display the load averages */
 542         (*d_loadave)(system_info.last_pid,
 543                      system_info.load_avg);
 544
 545         /* display the current time */
 546         /* this method of getting the time SHOULD be fairly portable */
 547         time(&curr_time);
 548         i_uptime(&system_info.boottime, &curr_time);
 549         i_timeofday(&curr_time);
 550
 551         /* display process state breakdown */
 552         (*d_procstates)(system_info.p_total,
 553                         system_info.procstates);
 554
 555         /* display the cpu state percentage breakdown */
 556         if (dostates)   /* but not the first time */
 557         {
 558             (*d_cpustates)(&system_info);
 559         }
 560         else
 561         {
 562             /* we'll do it next time */
 563             if (smart_terminal)
 564             {
 565                 z_cpustates(&system_info);
 566             }
 567             else
 568             {
 569                 putchar('\n');
 570             }
 571             dostates = Yes;
 572         }
 573
 574         /* display memory stats */
 575         (*d_memory)(system_info.memory);
 576
 577         /* display swap stats */
 578         (*d_swap)(system_info.swap);
 579
 580         /* handle message area */
 581         (*d_message)();
 582
 583         /* update the header area */
 584         (*d_header)(header_text);
 585
 586         if (topn > 0)
 587         {
 588             /* determine number of processes to actually display */
 589             /* this number will be the smallest of:  active processes,
 590                number user requested, number current screen accomodates */
 591             active_procs = system_info.P_ACTIVE;
 592             if (active_procs > topn)
 593             {
 594                 active_procs = topn;
 595             }
 596             if (active_procs > max_topn)
 597             {
 598                 active_procs = max_topn;
 599             }
 600
 601             /* now show the top "n" processes. */
 602             for (i = 0; i < active_procs; i++)
 603             {
 604                 (*d_process)(i, format_next_process(processes, get_userid));
 605             }
 606         }
 607         else
 608         {
 609             i = 0;
 610         }
 611
 612         /* do end-screen processing */
 613         u_endscreen(i);
 614
 615         /* now, flush the output buffer */
 616         if (fflush(stdout) != 0)
 617         {
 618             new_message(MT_standout, " Write error on stdout");
 619             putchar('\r');
 620             quit(1);
 621             /*NOTREACHED*/
 622         }
 623
 624         /* only do the rest if we have more displays to show */
 625         if (displays)
 626         {
 627             /* switch out for new display on smart terminals */
 628             if (smart_terminal)
 629             {
 630                 if (overstrike)
 631                 {
 632                     reset_display();
 633                 }
 634                 else
 635                 {
 636                     d_loadave = u_loadave;
 637                     d_procstates = u_procstates;
 638                     d_cpustates = i_cpustates;
 639                     d_memory = u_memory;
 640                     d_swap = u_swap;
 641                     d_message = u_message;
 642                     d_header = u_header;
 643                     d_process = u_process;
 644                 }
 645             }
 646
 647             no_command = Yes;
 648             if (!interactive)
 649             {
 650                 /* set up alarm */
 651                 (void) signal(SIGALRM, onalrm);
 652                 (void) alarm((unsigned)delay);
 653
 654                 /* wait for the rest of it .... */
 655                 pause();
 656             }
 657             else while (no_command)
 658             {
 659                 /* assume valid command unless told otherwise */
 660                 no_command = No;
 661
 662                 /* set up arguments for select with timeout */
 663                 FD_ZERO(&readfds);
 664                 FD_SET(0, &readfds);            /* for standard input */
 665                 mytimeout.tv_sec  = delay;
 666                 mytimeout.tv_usec = 0;
 667
 668                 if (leaveflag) {
 669                     end_screen();
 670                     exit(0);
 671                 }
 672
 673                 if (tstopflag) {
 674                     /* move to the lower left */
 675                     end_screen();
 676                     fflush(stdout);
 677
 678                     /* default the signal handler action */
 679                     (void) signal(SIGTSTP, SIG_DFL);
 680
 681                     /* unblock the signal and send ourselves one */
 682 #ifdef SIGRELSE
 683                     sigrelse(SIGTSTP);
 684 #else
 685                     (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
 686 #endif
 687                     (void) kill(0, SIGTSTP);
 688
 689                     /* reset the signal handler */
 690                     (void) signal(SIGTSTP, tstop);
 691
 692                     /* reinit screen */
 693                     reinit_screen();
 694                     reset_display();
 695                     tstopflag = 0;
 696                     goto restart;
 697                 }
 698
 699                 if (winchflag) {
 700                     /* reascertain the screen dimensions */
 701                     get_screensize();
 702
 703                     /* tell display to resize */
 704                     max_topn = display_resize();
 705
 706                     /* reset the signal handler */
 707                     (void) signal(SIGWINCH, mywinch);
 708
 709                     reset_display();
 710                     winchflag = 0;
 711                     goto restart;
 712                 }
 713
 714                 /* wait for either input or the end of the delay period */
 715                 sel_ret = select(2, &readfds, NULL, NULL, &mytimeout);
 716                 if (sel_ret < 0 && errno != EINTR)
 717                     quit(0);
 718                 if (sel_ret > 0)
 719                 {
 720                     int newval;
 721                     const char *xerrmsg;
 722
 723                     /* something to read -- clear the message area first */
 724                     clear_message();
 725
 726                     /* now read it and convert to command strchr */
 727                     /* (use "change" as a temporary to hold strchr) */
 728                     if (read(0, &ch, 1) != 1)
 729                     {
 730                         /* read error: either 0 or -1 */
 731                         new_message(MT_standout, " Read error on stdin");
 732                         putchar('\r');
 733                         quit(1);
 734                         /*NOTREACHED*/
 735                     }
 736                     if ((iptr = strchr(command_chars, ch)) == NULL)
 737                     {
 738                         if (ch != '\r' && ch != '\n')
 739                         {
 740                             /* illegal command */
 741                             new_message(MT_standout, " Command not understood");
 742                         }
 743                         putchar('\r');
 744                         no_command = Yes;
 745                     }
 746                     else
 747                     {
 748                         change = iptr - command_chars;
 749                         if (overstrike && change > CMD_OSLIMIT)
 750                         {
 751                             /* error */
 752                             new_message(MT_standout,
 753                             " Command cannot be handled by this terminal");
 754                             putchar('\r');
 755                             no_command = Yes;
 756                         }
 757                         else switch(change)
 758                         {
 759                             case CMD_redraw:    /* redraw screen */
 760                                 reset_display();
 761                                 break;
 762
 763                             case CMD_update:    /* merely update display */
 764                                 /* is the load average high? */
 765                                 if (system_info.load_avg[0] > LoadMax)
 766                                 {
 767                                     /* yes, go home for visual feedback */
 768                                     go_home();
 769                                     fflush(stdout);
 770                                 }
 771                                 break;
 772
 773                             case CMD_quit:      /* quit */
 774                                 quit(0);
 775                                 /*NOTREACHED*/
 776                                 break;
 777
 778                             case CMD_help1:     /* help */
 779                             case CMD_help2:
 780                                 reset_display();
 781                                 clear_myscreen();
 782                                 show_help();
 783                                 dostandout("Hit any key to continue: ");
 784                                 fflush(stdout);
 785                                 (void) read(0, &ch, 1);
 786                                 break;
 787
 788                             case CMD_errors:    /* show errors */
 789                                 if (error_count() == 0)
 790                                 {
 791                                     new_message(MT_standout,
 792                                         " Currently no errors to report.");
 793                                     putchar('\r');
 794                                     no_command = Yes;
 795                                 }
 796                                 else
 797                                 {
 798                                     reset_display();
 799                                     clear_myscreen();
 800                                     show_errors();
 801                                     dostandout("Hit any key to continue: ");
 802                                     fflush(stdout);
 803                                     (void) read(0, &ch, 1);
 804                                 }
 805                                 break;
 806
 807                             case CMD_number1:   /* new number */
 808                             case CMD_number2:
 809                                 new_message(MT_standout,
 810                                     "Number of processes to show: ");
 811                                 newval = readline(tempbuf1, 8, Yes);
 812                                 if (newval > -1)
 813                                 {
 814                                     if (newval > max_topn)
 815                                     {
 816                                         new_message(MT_standout | MT_delayed,
 817                                           " This terminal can only display %d processes.",
 818                                           max_topn);
 819                                         putchar('\r');
 820                                     }
 821
 822                                     if (newval == 0)
 823                                     {
 824                                         /* inhibit the header */
 825                                         display_header(No);
 826                                     }
 827                                     else if (newval > topn && topn == 0)
 828                                     {
 829                                         /* redraw the header */
 830                                         display_header(Yes);
 831                                         d_header = i_header;
 832                                     }
 833                                     topn = newval;
 834                                 }
 835                                 break;
 836
 837                             case CMD_delay:     /* new seconds delay */
 838                                 new_message(MT_standout, "Seconds to delay: ");
 839                                 if ((i = readline(tempbuf1, 8, Yes)) > -1)
 840                                 {
 841                                     if ((delay = i) == 0 && getuid() != 0)
 842                                     {
 843                                         delay = 1;
 844                                     }
 845                                 }
 846                                 clear_message();
 847                                 break;
 848
 849                             case CMD_displays:  /* change display count */
 850                                 new_message(MT_standout,
 851                                         "Displays to show (currently %s): ",
 852                                         displays == -1 ? "infinite" :
 853                                                          ltoa(displays));
 854                                 if ((i = readline(tempbuf1, 10, Yes)) > 0)
 855                                 {
 856                                     displays = i;
 857                                 }
 858                                 else if (i == 0)
 859                                 {
 860                                     quit(0);
 861                                 }
 862                                 clear_message();
 863                                 break;
 864
 865                             case CMD_kill:      /* kill program */
 866                                 new_message(0, "kill ");
 867                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 868                                 {
 869                                     if ((xerrmsg = kill_procs(tempbuf2)) != NULL)
 870                                     {
 871                                         new_message(MT_standout, "%s", xerrmsg);
 872                                         putchar('\r');
 873                                         no_command = Yes;
 874                                     }
 875                                 }
 876                                 else
 877                                 {
 878                                     clear_message();
 879                                 }
 880                                 break;
 881
 882                             case CMD_renice:    /* renice program */
 883                                 new_message(0, "renice ");
 884                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 885                                 {
 886                                     if ((xerrmsg = renice_procs(tempbuf2)) != NULL)
 887                                     {
 888                                         new_message(MT_standout, "%s", xerrmsg);
 889                                         putchar('\r');
 890                                         no_command = Yes;
 891                                     }
 892                                 }
 893                                 else
 894                                 {
 895                                     clear_message();
 896                                 }
 897                                 break;
 898
 899                             case CMD_idletog:
 900                             case CMD_idletog2:
 901                                 ps.idle = !ps.idle;
 902                                 new_message(MT_standout | MT_delayed,
 903                                     " %sisplaying idle processes.",
 904                                     ps.idle ? "D" : "Not d");
 905                                 putchar('\r');
 906                                 break;
 907
 908                             case CMD_selftog:
 909                                 ps.self = (ps.self == -1) ? getpid() : -1;
 910                                 new_message(MT_standout | MT_delayed,
 911                                     " %sisplaying self.",
 912                                     (ps.self == -1) ? "D" : "Not d");
 913                                 putchar('\r');
 914                                 break;
 915
 916                             case CMD_threads:
 917                                 ps.threads = !ps.threads;
 918                                 new_message(MT_standout | MT_delayed,
 919                                    " %sisplaying threads.",
 920                                    ps.threads ? "D" : "Not d");
 921                                 putchar('\r');
 922                                 break;
 923
 924                                 case CMD_othreads:
 925                                         ps.only_threads = !ps.only_threads;
 926                                         new_message(MT_standout | MT_delayed,
 927                                         ps.only_threads ?
 928                                           "Only displaying threads." :
 929                                           "Displaying threads and processes.");
 930                                 putchar('\r');
 931                                 break;
 932
 933                             case CMD_system:
 934                                 ps.system = !ps.system;
 935                                 new_message(MT_standout | MT_delayed,
 936                                    " %sisplaying system processes.",
 937                                    ps.system ? "D" : "Not d");
 938                                 putchar('\r');
 939                                 break;
 940
 941                             case CMD_user:
 942                                 new_message(MT_standout,
 943                                     "Username to show: ");
 944                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 945                                 {
 946                                     if (tempbuf2[0] == '+' &&
 947                                         tempbuf2[1] == '\0')
 948                                     {
 949                                         ps.uid = -1;
 950                                     }
 951                                     else if ((i = userid(tempbuf2)) == -1)
 952                                     {
 953                                         new_message(MT_standout,
 954                                             " %s: unknown user", tempbuf2);
 955                                         no_command = Yes;
 956                                     }
 957                                     else
 958                                     {
 959                                         ps.uid = i;
 960                                     }
 961                                     putchar('\r');
 962                                 }
 963                                 else
 964                                 {
 965                                     clear_message();
 966                                 }
 967                                 break;
 968
 969 #ifdef ORDER
 970                             case CMD_order:
 971                                 new_message(MT_standout,
 972                                     "Order to sort: ");
 973                                 if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
 974                                 {
 975                                   if ((i = string_index(tempbuf2, statics.order_names)) == -1)
 976                                         {
 977                                           new_message(MT_standout,
 978                                               " %s: unrecognized sorting order", tempbuf2);
 979                                           no_command = Yes;
 980                                     }
 981                                     else
 982                                     {
 983                                         order_index = i;
 984                                     }
 985                                     putchar('\r');
 986                                 }
 987                                 else
 988                                 {
 989                                     clear_message();
 990                                 }
 991                                 break;
 992 #endif
 993
 994                             default:
 995                                 new_message(MT_standout, " BAD CASE IN SWITCH!");
 996                                 putchar('\r');
 997                         }
 998                     }
 999
1000                     /* flush out stuff that may have been written */
1001                     fflush(stdout);
1002                 }
1003             }
1004         }
1005     }
1006
1007 #ifdef DEBUG
1008     fclose(debug);
1009 #endif
1010     quit(0);
1011     /*NOTREACHED*/
1012     return(0);
1013 }
1014
1015 /*
1016  *  reset_display() - reset all the display routine pointers so that entire
1017  *      screen will get redrawn.
1018  */
1019
1020 static void
1021 reset_display(void)
1022 {
1023     d_loadave    = i_loadave;
1024     d_procstates = i_procstates;
1025     d_cpustates  = i_cpustates;
1026     d_memory     = i_memory;
1027     d_swap       = i_swap;
1028     d_message    = i_message;
1029     d_header     = i_header;
1030     d_process    = i_process;
1031 }
1032
1033 /*
1034  *  signal handlers
1035  */
1036
1037 /* exit under normal conditions -- INT handler */
1038 sigret_t
1039 leave(int signo __unused)
1040 {
1041     leaveflag = 1;
1042 }
1043
1044 sigret_t
1045 tstop(int signo __unused)       /* SIGTSTP handler */
1046 {
1047     tstopflag = 1;
1048 }
1049
1050 #ifdef SIGWINCH
1051 sigret_t
1052 mywinch(int signo __unused)             /* SIGWINCH handler */
1053 {
1054     winchflag = 1;
1055 }
1056 #endif
1057
1058 void
1059 quit(int status)                /* exit under duress */
1060 {
1061     end_screen();
1062     exit(status);
1063     /*NOTREACHED*/
1064 }
1065
1066 sigret_t
1067 onalrm(int signo __unused)      /* SIGALRM handler */
1068
1069 {
1070     /* this is only used in batch mode to break out of the pause() */
1071     /* return; */
1072 }
1073