contrib/top/top.c

   1 /*
   2  * Copyright (c) 1984 through 2008, William LeFebvre
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions are met:
   7  *
   8  *     * Redistributions of source code must retain the above copyright
   9  * notice, this list of conditions and the following disclaimer.
  10  *
  11  *     * Redistributions in binary form must reproduce the above
  12  * copyright notice, this list of conditions and the following disclaimer
  13  * in the documentation and/or other materials provided with the
  14  * distribution.
  15  *
  16  *     * Neither the name of William LeFebvre nor the names of other
  17  * contributors may be used to endorse or promote products derived from
  18  * this software without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  21  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  22  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  23  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  24  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  25  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  26  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  27  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  28  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  29  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  30  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  31  */
  32
  33 char *copyright =
  34     "Copyright (c) 1984 through 2008, William LeFebvre";
  35
  36 /*
  37  * Changes to other files that we can do at the same time:
  38  * screen.c:init_termcap: get rid of the "interactive" argument and have it
  39  *      pass back something meaningful (such as success/failure/error).
  40  */
  41
  42 #include "os.h"
  43 #include <signal.h>
  44 #include <setjmp.h>
  45 #include <ctype.h>
  46 #include <sys/types.h>
  47 #include <sys/uio.h>
  48 #include <unistd.h>
  49
  50 #ifdef HAVE_SYS_UTSNAME_H
  51 #include <sys/utsname.h>
  52 #endif
  53
  54 #ifdef HAVE_GETOPT_H
  55 #include <getopt.h>
  56 #endif
  57
  58 /* definitions */
  59 #ifndef STDIN_FILENO
  60 #define STDIN_FILENO 0
  61 #endif
  62
  63 /* determine which type of signal functions to use */
  64 /* cant have sigaction without sigprocmask */
  65 #if defined(HAVE_SIGACTION) && !defined(HAVE_SIGPROCMASK)
  66 #undef HAVE_SIGACTION
  67 #endif
  68 /* always use sigaction when it is available */
  69 #ifdef HAVE_SIGACTION
  70 #undef HAVE_SIGHOLD
  71 #else
  72 /* use sighold/sigrelse, otherwise use old fashioned BSD signals */
  73 #if !defined(HAVE_SIGHOLD) || !defined(HAVE_SIGRELSE)
  74 #define BSD_SIGNALS
  75 #endif
  76 #endif
  77
  78 /* if FD_SET and friends aren't present, then fake something up */
  79 #ifndef FD_SET
  80 typedef int fd_set;
  81 #define FD_ZERO(x)     (*(x) = 0)
  82 #define FD_SET(f, x)   (*(x) = 1<<f)
  83 #endif
  84
  85 /* includes specific to top */
  86
  87 #include "top.h"
  88 #include "machine.h"
  89 #include "globalstate.h"
  90 #include "commands.h"
  91 #include "display.h"
  92 #include "screen.h"
  93 #include "boolean.h"
  94 #include "username.h"
  95 #include "utils.h"
  96 #include "version.h"
  97 #ifdef ENABLE_COLOR
  98 #include "color.h"
  99 #endif
 100
 101 /* definitions */
 102 #define BUFFERSIZE 4096
 103 #define JMP_RESUME 1
 104 #define JMP_RESIZE 2
 105
 106 /* externs for getopt: */
 107 extern int  optind;
 108 extern char *optarg;
 109
 110 /* statics */
 111 static char stdoutbuf[BUFFERSIZE];
 112 static jmp_buf jmp_int;
 113
 114 /* globals */
 115 char *myname = "top";
 116
 117 void
 118 quit(int status)
 119
 120 {
 121     screen_end();
 122     chdir("/tmp");
 123     exit(status);
 124     /* NOTREACHED */
 125 }
 126
 127 /*
 128  *  signal handlers
 129  */
 130
 131 void
 132 set_signal(int sig, RETSIGTYPE (*handler)(int))
 133
 134 {
 135 #ifdef HAVE_SIGACTION
 136     struct sigaction action;
 137
 138     action.sa_handler = handler;
 139     action.sa_flags = 0;
 140     (void) sigaction(sig, &action, NULL);
 141 #else
 142     (void) signal(sig, handler);
 143 #endif
 144 }
 145
 146 void
 147 release_signal(int sig)
 148
 149 {
 150 #ifdef HAVE_SIGACTION
 151     sigset_t set;
 152     sigemptyset(&set);
 153     sigaddset(&set, sig);
 154     sigprocmask(SIG_UNBLOCK, &set, NULL);
 155 #endif
 156
 157 #ifdef HAVE_SIGHOLD
 158     sigrelse(sig);
 159 #endif
 160
 161 #ifdef BSD_SIGNALS
 162     (void) sigsetmask(sigblock(0) & ~(sigmask(sig)));
 163 #endif
 164 }
 165
 166 RETSIGTYPE
 167 sig_leave(int i)        /* exit under normal conditions -- INT handler */
 168
 169 {
 170     screen_end();
 171     exit(EX_OK);
 172 }
 173
 174 RETSIGTYPE
 175 sig_tstop(int i)        /* SIGTSTP handler */
 176
 177 {
 178     /* move to the lower left */
 179     screen_end();
 180     fflush(stdout);
 181
 182     /* default the signal handler action */
 183     set_signal(SIGTSTP, SIG_DFL);
 184
 185     /* unblock the TSTP signal */
 186     release_signal(SIGTSTP);
 187
 188     /* send ourselves a TSTP to stop the process */
 189     (void) kill(0, SIGTSTP);
 190
 191     /* reset the signal handler */
 192     set_signal(SIGTSTP, sig_tstop);
 193
 194     /* reinit screen */
 195     screen_reinit();
 196
 197     /* jump back to a known place in the main loop */
 198     longjmp(jmp_int, JMP_RESUME);
 199
 200     /* NOTREACHED */
 201 }
 202
 203 #ifdef SIGWINCH
 204 RETSIGTYPE
 205 sig_winch(int i)                /* SIGWINCH handler */
 206
 207 {
 208     /* reascertain the screen dimensions */
 209     screen_getsize();
 210
 211     /* jump back to a known place in the main loop */
 212     longjmp(jmp_int, JMP_RESIZE);
 213 }
 214 #endif
 215
 216 #ifdef HAVE_SIGACTION
 217 static sigset_t signalset;
 218 #endif
 219
 220 void *
 221 hold_signals()
 222
 223 {
 224 #ifdef HAVE_SIGACTION
 225     sigemptyset(&signalset);
 226     sigaddset(&signalset, SIGINT);
 227     sigaddset(&signalset, SIGQUIT);
 228     sigaddset(&signalset, SIGTSTP);
 229 #ifdef SIGWINCH
 230     sigaddset(&signalset, SIGWINCH);
 231 #endif
 232     sigprocmask(SIG_BLOCK, &signalset, NULL);
 233     return (void *)(&signalset);
 234 #endif
 235
 236 #ifdef HAVE_SIGHOLD
 237     sighold(SIGINT);
 238     sighold(SIGQUIT);
 239     sighold(SIGTSTP);
 240 #ifdef SIGWINCH
 241     sighold(SIGWINCH);
 242     return NULL;
 243 #endif
 244 #endif
 245
 246 #ifdef BSD_SIGNALS
 247     int mask;
 248 #ifdef SIGWINCH
 249     mask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) |
 250                     sigmask(SIGTSTP) | sigmask(SIGWINCH));
 251 #else
 252     mask = sigblock(sigmask(SIGINT) | sigmask(SIGQUIT) | sigmask(SIGTSTP));
 253     return (void *)mask;
 254 #endif
 255 #endif
 256
 257 }
 258
 259 void
 260 set_signals()
 261
 262 {
 263     (void) set_signal(SIGINT, sig_leave);
 264     (void) set_signal(SIGQUIT, sig_leave);
 265     (void) set_signal(SIGTSTP, sig_tstop);
 266 #ifdef SIGWINCH
 267     (void) set_signal(SIGWINCH, sig_winch);
 268 #endif
 269 }
 270
 271 void
 272 release_signals(void *parm)
 273
 274 {
 275 #ifdef HAVE_SIGACTION
 276     sigprocmask(SIG_UNBLOCK, (sigset_t *)parm, NULL);
 277 #endif
 278
 279 #ifdef HAVE_SIGHOLD
 280     sigrelse(SIGINT);
 281     sigrelse(SIGQUIT);
 282     sigrelse(SIGTSTP);
 283 #ifdef SIGWINCH
 284     sigrelse(SIGWINCH);
 285 #endif
 286 #endif
 287
 288 #ifdef BSD_SIGNALS
 289     (void) sigsetmask((int)parm);
 290 #endif
 291 }
 292
 293 /*
 294  * void do_arguments(globalstate *gstate, int ac, char **av)
 295  *
 296  * Arguments processing.  gstate points to the global state,
 297  * ac and av are the arguments to process.  This can be called
 298  * multiple times with different sets of arguments.
 299  */
 300
 301 #ifdef HAVE_GETOPT_LONG
 302 static struct option longopts[] = {
 303     { "color", no_argument, NULL, 'C' },
 304     { "debug", no_argument, NULL, 'D' },
 305     { "system-procs", no_argument, NULL, 'S' },
 306     { "idle-procs", no_argument, NULL, 'I' },
 307     { "tag-names", no_argument, NULL, 'T' },
 308     { "all", no_argument, NULL, 'a' },
 309     { "batch", no_argument, NULL, 'b' },
 310     { "full-commands", no_argument, NULL, 'c' },
 311     { "interactive", no_argument, NULL, 'i' },
 312     { "quick", no_argument, NULL, 'q' },
 313     { "threads", no_argument, NULL, 't' },
 314     { "uids", no_argument, NULL, 'u' },
 315     { "version", no_argument, NULL, 'v' },
 316     { "delay", required_argument, NULL, 's' },
 317     { "displays", required_argument, NULL, 'd' },
 318     { "user", required_argument, NULL, 'U' },
 319     { "sort-order", required_argument, NULL, 'o' },
 320     { "display-mode", required_argument, NULL, 'm' },
 321     { NULL, 0, NULL, 0 },
 322 };
 323 #endif
 324
 325
 326 void
 327 do_arguments(globalstate *gstate, int ac, char **av)
 328
 329 {
 330     int i;
 331
 332     /* this appears to keep getopt happy */
 333     optind = 1;
 334
 335 #ifdef HAVE_GETOPT_LONG
 336     while ((i = getopt_long(ac, av, "CDSIMTabcinqtuvs:d:U:o:m:", longopts, NULL)) != -1)
 337 #else
 338     while ((i = getopt(ac, av, "CDSIMTabcinqtuvs:d:U:o:m:")) != EOF)
 339 #endif
 340     {
 341         switch(i)
 342         {
 343 #ifdef ENABLE_COLOR
 344         case 'C':
 345             gstate->use_color = !gstate->use_color;
 346             break;
 347 #endif
 348
 349         case 'D':
 350             debug_set(1);
 351             break;
 352
 353         case 'v':
 354             fprintf(stderr, "%s: version %s\n", myname, version_string());
 355             exit(EX_OK);
 356             break;
 357
 358         case 'b':
 359         case 'n':
 360             gstate->interactive = No;
 361             break;
 362
 363         case 'a':
 364             gstate->displays = Infinity;
 365             gstate->topn = Infinity;
 366             break;
 367
 368         case 'i':
 369             gstate->interactive = Yes;
 370             break;
 371
 372         case 'o':
 373             gstate->order_name = optarg;
 374             break;
 375
 376         case 'd':
 377             i = atoiwi(optarg);
 378             if (i == Invalid || i == 0)
 379             {
 380                 message_error(" Bad display count");
 381             }
 382             else
 383             {
 384                 gstate->displays = i;
 385             }
 386             break;
 387
 388         case 's':
 389             i = atoi(optarg);
 390             if (i < 0 || (i == 0 && getuid() != 0))
 391             {
 392                 message_error(" Bad seconds delay");
 393             }
 394             else
 395             {
 396                 gstate->delay = i;
 397             }
 398             break;
 399
 400         case 'u':
 401             gstate->show_usernames = !gstate->show_usernames;
 402             break;
 403
 404         case 'U':
 405             i = userid(optarg);
 406             if (i == -1)
 407             {
 408                 message_error(" Unknown user '%s'", optarg);
 409             }
 410             else
 411             {
 412                 gstate->pselect.uid = i;
 413             }
 414             break;
 415
 416         case 'm':
 417             i = atoi(optarg);
 418             gstate->pselect.mode = i;
 419             break;
 420
 421         case 'S':
 422             gstate->pselect.system = !gstate->pselect.system;
 423             break;
 424
 425         case 'I':
 426             gstate->pselect.idle = !gstate->pselect.idle;
 427             break;
 428
 429         case 'M':
 430             enable_ncpus = 1;
 431             break;
 432
 433
 434 #ifdef ENABLE_COLOR
 435         case 'T':
 436             gstate->show_tags = 1;
 437             break;
 438 #endif
 439
 440         case 'c':
 441             gstate->pselect.fullcmd = !gstate->pselect.fullcmd;
 442             break;
 443
 444         case 't':
 445             gstate->pselect.threads = !gstate->pselect.threads;
 446             break;
 447
 448         case 'q':               /* be quick about it */
 449             /* only allow this if user is really root */
 450             if (getuid() == 0)
 451             {
 452                 /* be very un-nice! */
 453                 (void) nice(-20);
 454             }
 455             else
 456             {
 457                 message_error(" Option -q can only be used by root");
 458             }
 459             break;
 460
 461         default:
 462             fprintf(stderr, "\
 463 Top version %s\n\
 464 Usage: %s [-ISTabcinqu] [-d x] [-s x] [-o field] [-U username] [number]\n",
 465                     version_string(), myname);
 466             exit(EX_USAGE);
 467         }
 468     }
 469
 470     /* get count of top processes to display */
 471     if (optind < ac && *av[optind])
 472     {
 473         if ((i = atoiwi(av[optind])) == Invalid)
 474         {
 475             message_error(" Process count not a number");
 476         }
 477         else
 478         {
 479             gstate->topn = i;
 480         }
 481     }
 482 }
 483
 484 void
 485 do_display(globalstate *gstate)
 486
 487 {
 488     int active_procs;
 489     int i;
 490     time_t curr_time;
 491     caddr_t processes;
 492     struct system_info system_info;
 493     char *hdr;
 494
 495     /* get the time */
 496     time_mark(&(gstate->now));
 497     curr_time = (time_t)(gstate->now.tv_sec);
 498
 499     /* get the current stats */
 500     get_system_info(&system_info);
 501
 502     /* get the current processes */
 503     processes = get_process_info(&system_info, &(gstate->pselect), gstate->order_index);
 504
 505     /* determine number of processes to actually display */
 506     if (gstate->topn > 0)
 507     {
 508         /* this number will be the smallest of:  active processes,
 509            number user requested, number current screen accomodates */
 510         active_procs = system_info.P_ACTIVE;
 511         if (active_procs > gstate->topn)
 512         {
 513             active_procs = gstate->topn;
 514         }
 515         if (active_procs > gstate->max_topn)
 516         {
 517             active_procs = gstate->max_topn;
 518         }
 519     }
 520     else
 521     {
 522         /* dont show any */
 523         active_procs = 0;
 524     }
 525
 526     hdr = gstate->header_text;
 527
 528     /* full screen or update? */
 529     if (gstate->fulldraw)
 530     {
 531         display_clear();
 532         i_loadave(system_info.last_pid, system_info.load_avg);
 533         i_uptime(&(gstate->statics->boottime), &curr_time);
 534         i_timeofday(&curr_time);
 535         i_procstates(system_info.p_total, system_info.procstates, gstate->pselect.threads);
 536         if (gstate->show_cpustates)
 537         {
 538             i_cpustates(system_info.cpustates);
 539         }
 540         else
 541         {
 542             if (smart_terminal)
 543             {
 544                 z_cpustates();
 545             }
 546             gstate->show_cpustates = Yes;
 547         }
 548         i_kernel(system_info.kernel);
 549         i_memory(system_info.memory);
 550         i_swap(system_info.swap);
 551         i_message(&(gstate->now));
 552         i_header(hdr);
 553         for (i = 0; i < active_procs; i++)
 554         {
 555             i_process(i, format_next_process(processes, gstate->get_userid));
 556         }
 557         i_endscreen();
 558         if (gstate->smart_terminal)
 559         {
 560             gstate->fulldraw = No;
 561         }
 562     }
 563     else
 564     {
 565         u_loadave(system_info.last_pid, system_info.load_avg);
 566         u_uptime(&(gstate->statics->boottime), &curr_time);
 567         i_timeofday(&curr_time);
 568         u_procstates(system_info.p_total, system_info.procstates, gstate->pselect.threads);
 569         u_cpustates(system_info.cpustates);
 570         u_kernel(system_info.kernel);
 571         u_memory(system_info.memory);
 572         u_swap(system_info.swap);
 573         u_message(&(gstate->now));
 574         u_header(hdr);
 575         for (i = 0; i < active_procs; i++)
 576         {
 577             u_process(i, format_next_process(processes, gstate->get_userid));
 578         }
 579         u_endscreen();
 580     }
 581 }
 582
 583 #ifdef DEBUG
 584 void
 585 timeval_xdprint(char *s, struct timeval tv)
 586
 587 {
 588     xdprintf("%s %d.%06d\n", s, tv.tv_sec, tv.tv_usec);
 589 }
 590 #endif
 591
 592 void
 593 do_wait(globalstate *gstate)
 594
 595 {
 596     struct timeval wait;
 597
 598     wait.tv_sec = gstate->delay;
 599     wait.tv_usec = 0;
 600     select(0, NULL, NULL, NULL, &wait);
 601 }
 602
 603 void
 604 do_command(globalstate *gstate)
 605
 606 {
 607     int status;
 608     struct timeval wait = {0, 0};
 609     struct timeval now;
 610     fd_set readfds;
 611     unsigned char ch;
 612
 613     /* calculate new refresh time */
 614     gstate->refresh = gstate->now;
 615     gstate->refresh.tv_sec += gstate->delay;
 616     time_get(&now);
 617
 618     /* loop waiting for time to expire */
 619     do {
 620         /* calculate time to wait */
 621         if (gstate->delay > 0)
 622         {
 623             wait = gstate->refresh;
 624             wait.tv_usec -= now.tv_usec;
 625             if (wait.tv_usec < 0)
 626             {
 627                 wait.tv_usec += 1000000;
 628                 wait.tv_sec--;
 629             }
 630             wait.tv_sec -= now.tv_sec;
 631         }
 632
 633         /* set up arguments for select on stdin (0) */
 634         FD_ZERO(&readfds);
 635         FD_SET(STDIN_FILENO, &readfds);
 636
 637         /* wait for something to read or time out */
 638         if (select(32, &readfds, NULL, NULL, &wait) > 0)
 639         {
 640             /* read it */
 641             if (read(STDIN_FILENO, &ch, 1) != 1)
 642             {
 643                 /* read error */
 644                 message_error(" Read error on stdin");
 645                 quit(EX_DATAERR);
 646                 /*NOTREACHED*/
 647             }
 648
 649             /* mark pending messages as old */
 650             message_mark();
 651
 652             /* dispatch */
 653             status = command_process(gstate, (int)ch);
 654             switch(status)
 655             {
 656             case CMD_ERROR:
 657                 quit(EX_SOFTWARE);
 658                 /*NOTREACHED*/
 659
 660             case CMD_REFRESH:
 661                 return;
 662
 663             case CMD_UNKNOWN:
 664                 message_error(" Unknown command");
 665                 break;
 666
 667             case CMD_NA:
 668                 message_error(" Command not available");
 669             }
 670         }
 671
 672         /* get new time */
 673         time_get(&now);
 674     } while (timercmp(&now, &(gstate->refresh), < ));
 675 }
 676
 677 void
 678 do_minidisplay(globalstate *gstate)
 679
 680 {
 681     int real_delay;
 682     struct system_info si;
 683
 684     /* save the real delay and substitute 1 second */
 685     real_delay = gstate->delay;
 686     gstate->delay = 1;
 687
 688     /* wait 1 second for a command */
 689     time_mark(&(gstate->now));
 690     do_command(gstate);
 691
 692     /* do a mini update that only updates the cpustates */
 693     get_system_info(&si);
 694     u_cpustates(si.cpustates);
 695
 696     /* restore the delay time */
 697     gstate->delay = real_delay;
 698
 699     /* done */
 700     i_endscreen();
 701 }
 702
 703 int
 704 main(int argc, char *argv[])
 705
 706 {
 707     char *env_top;
 708     char **preset_argv;
 709     int preset_argc = 0;
 710     void *mask;
 711     int need_mini = 1;
 712
 713     struct statics statics;
 714     globalstate *gstate;
 715
 716     /* get our name */
 717     if (argc > 0)
 718     {
 719         if ((myname = strrchr(argv[0], '/')) == 0)
 720         {
 721             myname = argv[0];
 722         }
 723         else
 724         {
 725             myname++;
 726         }
 727     }
 728
 729     /* binary compatibility check */
 730 #ifdef HAVE_UNAME
 731     {
 732         struct utsname uts;
 733
 734         if (uname(&uts) == 0)
 735         {
 736             if (strcmp(uts.machine, UNAME_HARDWARE) != 0)
 737             {
 738                 fprintf(stderr, "%s: incompatible hardware platform\n",
 739                         myname);
 740                 exit(EX_UNAVAILABLE);
 741             }
 742         }
 743     }
 744 #endif
 745
 746     /* initialization */
 747     gstate = (globalstate *)calloc(1, sizeof(globalstate));
 748     gstate->statics = &statics;
 749     time_mark(NULL);
 750
 751     /* preset defaults for various options */
 752     gstate->show_usernames = Yes;
 753     gstate->topn = DEFAULT_TOPN;
 754     gstate->delay = DEFAULT_DELAY;
 755     gstate->fulldraw = Yes;
 756     gstate->use_color = Yes;
 757     gstate->interactive = Maybe;
 758
 759     /* preset defaults for process selection */
 760     gstate->pselect.idle = Yes;
 761     gstate->pselect.system = No;
 762     gstate->pselect.fullcmd = No;
 763     gstate->pselect.command = NULL;
 764     gstate->pselect.uid = -1;
 765     gstate->pselect.mode = 0;
 766
 767     /* use a large buffer for stdout */
 768 #ifdef HAVE_SETVBUF
 769     setvbuf(stdout, stdoutbuf, _IOFBF, BUFFERSIZE);
 770 #else
 771 #ifdef HAVE_SETBUFFER
 772     setbuffer(stdout, stdoutbuf, BUFFERSIZE);
 773 #endif
 774 #endif
 775
 776     /* get preset options from the environment */
 777     if ((env_top = getenv("TOP")) != NULL)
 778     {
 779         preset_argv = argparse(env_top, &preset_argc);
 780         preset_argv[0] = myname;
 781         do_arguments(gstate, preset_argc, preset_argv);
 782     }
 783
 784     /* process arguments */
 785     do_arguments(gstate, argc, argv);
 786
 787 #ifdef ENABLE_COLOR
 788     /* If colour has been turned on read in the settings. */
 789     env_top = getenv("TOPCOLOURS");
 790     if (!env_top)
 791     {
 792         env_top = getenv("TOPCOLORS");
 793     }
 794     /* must do something about error messages */
 795     color_env_parse(env_top);
 796     color_activate(gstate->use_color);
 797 #endif
 798
 799     /* in order to support forward compatability, we have to ensure that
 800        the entire statics structure is set to a known value before we call
 801        machine_init.  This way fields that a module does not know about
 802        will retain their default values */
 803     memzero((void *)&statics, sizeof(statics));
 804     statics.boottime = -1;
 805
 806     /* call the platform-specific init */
 807     if (machine_init(&statics) == -1)
 808     {
 809         exit(EX_SOFTWARE);
 810     }
 811
 812     /* create a helper list of sort order names */
 813     gstate->order_namelist = string_list(statics.order_names);
 814
 815     /* look up chosen sorting order */
 816     if (gstate->order_name != NULL)
 817     {
 818         int i;
 819
 820         if (statics.order_names == NULL)
 821         {
 822             message_error(" This platform does not support arbitrary ordering");
 823         }
 824         else if ((i = string_index(gstate->order_name,
 825                                    statics.order_names)) == -1)
 826         {
 827             message_error(" Sort order `%s' not recognized", gstate->order_name);
 828             message_error(" Recognized sort orders: %s", gstate->order_namelist);
 829         }
 830         else
 831         {
 832             gstate->order_index = i;
 833         }
 834     }
 835
 836     /* initialize extensions */
 837     init_username();
 838
 839     /* initialize termcap */
 840     gstate->smart_terminal = screen_readtermcap(gstate->interactive);
 841
 842     /* determine interactive state */
 843     if (gstate->interactive == Maybe)
 844     {
 845         gstate->interactive = smart_terminal;
 846     }
 847
 848     /* if displays were not specified, choose an appropriate default */
 849     if (gstate->displays == 0)
 850     {
 851         gstate->displays = gstate->smart_terminal ? Infinity: 1;
 852     }
 853
 854     /* we don't need a mini display when delay is less than 2
 855        seconds or when we are not on a smart terminal */
 856     if (gstate->delay <= 1 || !smart_terminal)
 857     {
 858         need_mini = 0;
 859     }
 860
 861     /* set constants for username/uid display */
 862     if (gstate->show_usernames)
 863     {
 864         gstate->header_text = format_header("USERNAME");
 865         gstate->get_userid = username;
 866     }
 867     else
 868     {
 869         gstate->header_text = format_header("   UID  ");
 870         gstate->get_userid = itoa7;
 871     }
 872     gstate->pselect.usernames = gstate->show_usernames;
 873
 874     /* initialize display */
 875     if ((gstate->max_topn = display_init(&statics)) == -1)
 876     {
 877         fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
 878         exit(EX_OSERR);
 879     }
 880
 881     /* check for infinity and for overflowed screen */
 882     if (gstate->topn == Infinity)
 883     {
 884         gstate->topn = INT_MAX;
 885     }
 886     else if (gstate->topn > gstate->max_topn)
 887     {
 888 #if 0
 889         message_error(" This terminal can only display %d processes",
 890                       gstate->max_topn);
 891 #endif
 892     }
 893
 894 #ifdef ENABLE_COLOR
 895     /* producing a list of color tags is easy */
 896     if (gstate->show_tags)
 897     {
 898         color_dump(stdout);
 899         exit(EX_OK);
 900     }
 901 #endif
 902
 903     /* hold all signals while we initialize the screen */
 904     mask = hold_signals();
 905     screen_init();
 906
 907     /* set the signal handlers */
 908     set_signals();
 909
 910     /* longjmp re-entry point */
 911     /* set the jump buffer for long jumps out of signal handlers */
 912     if (setjmp(jmp_int) != 0)
 913     {
 914         /* this is where we end up after processing sigwinch or sigtstp */
 915
 916         /* tell display to resize its buffers, and get the new length */
 917         if ((gstate->max_topn = display_resize()) == -1)
 918         {
 919             /* thats bad */
 920             quit(EX_OSERR);
 921             /*NOTREACHED*/
 922         }
 923
 924         /* set up for a full redraw, and get the current line count */
 925         gstate->fulldraw = Yes;
 926
 927         /* safe to release the signals now */
 928         release_signals(mask);
 929     }
 930     else
 931     {
 932         /* release the signals */
 933         release_signals(mask);
 934
 935         /* some systems require a warmup */
 936         /* always do a warmup for batch mode */
 937         if (gstate->interactive == 0 || statics.flags.warmup)
 938         {
 939             struct system_info system_info;
 940             struct timeval timeout;
 941
 942             time_mark(&(gstate->now));
 943             get_system_info(&system_info);
 944             (void)get_process_info(&system_info, &gstate->pselect, 0);
 945             timeout.tv_sec = 1;
 946             timeout.tv_usec = 0;
 947             select(0, NULL, NULL, NULL, &timeout);
 948
 949             /* if we've warmed up, then we can show good states too */
 950             gstate->show_cpustates = Yes;
 951             need_mini = 0;
 952         }
 953     }
 954
 955     /* main loop */
 956     while ((gstate->displays == -1) || (--gstate->displays > 0))
 957     {
 958         do_display(gstate);
 959         if (gstate->interactive)
 960         {
 961             if (need_mini)
 962             {
 963                 do_minidisplay(gstate);
 964                 need_mini = 0;
 965             }
 966             do_command(gstate);
 967         }
 968         else
 969         {
 970             do_wait(gstate);
 971         }
 972     }
 973
 974     /* do one last display */
 975     do_display(gstate);
 976
 977     quit(EX_OK);
 978     /* NOTREACHED */
 979     return 1; /* Keep compiler quiet. */
 980 }