top.c revision 169257 
1char *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: head/contrib/top/top.c 169257 2007-05-04 15:42:58Z rafan $
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 */
56char stdoutbuf[Buffersize];
57
58/* build Signal masks */
59#define Smask(s)	(1 << ((s) - 1))
60
61/* for getopt: */
62extern int  optind;
63extern char *optarg;
64
65/* imported from screen.c */
66extern int overstrike;
67
68static int fmt_flags = 0;
69
70/* signal handling routines */
71sigret_t leave();
72sigret_t onalrm();
73sigret_t tstop();
74#ifdef SIGWINCH
75sigret_t winch();
76#endif
77
78volatile sig_atomic_t leaveflag;
79volatile sig_atomic_t tstopflag;
80volatile sig_atomic_t winchflag;
81
82/* internal routines */
83void quit();
84
85/* values which need to be accessed by signal handlers */
86static int max_topn;		/* maximum displayable processes */
87
88/* miscellaneous things */
89struct process_select ps;
90char *myname = "top";
91jmp_buf jmp_int;
92
93/* routines that don't return int */
94
95char *username();
96char *ctime();
97char *kill_procs();
98char *renice_procs();
99
100#ifdef ORDER
101extern int (*compares[])();
102#else
103extern int proc_compare();
104extern int io_compare();
105#endif
106time_t time();
107
108caddr_t get_process_info();
109
110/* different routines for displaying the user's identification */
111/* (values assigned to get_userid) */
112char *username();
113char *itoa7();
114
115/* display routines that need to be predeclared */
116int i_loadave();
117int u_loadave();
118int i_procstates();
119int u_procstates();
120int i_cpustates();
121int u_cpustates();
122int i_memory();
123int u_memory();
124int i_swap();
125int u_swap();
126int i_message();
127int u_message();
128int i_header();
129int u_header();
130int i_process();
131int u_process();
132
133/* pointers to display routines */
134int (*d_loadave)() = i_loadave;
135int (*d_procstates)() = i_procstates;
136int (*d_cpustates)() = i_cpustates;
137int (*d_memory)() = i_memory;
138int (*d_swap)() = i_swap;
139int (*d_message)() = i_message;
140int (*d_header)() = i_header;
141int (*d_process)() = i_process;
142
143
144main(argc, argv)
145
146int  argc;
147char *argv[];
148
149{
150    register int i;
151    register int active_procs;
152    register int change;
153
154    struct system_info system_info;
155    struct statics statics;
156    caddr_t processes;
157
158    static char tempbuf1[50];
159    static char tempbuf2[50];
160    int old_sigmask;		/* only used for BSD-style signals */
161    int topn = Default_TOPN;
162    int delay = Default_DELAY;
163    int displays = 0;		/* indicates unspecified */
164    int sel_ret = 0;
165    time_t curr_time;
166    char *(*get_userid)() = username;
167    char *uname_field = "USERNAME";
168    char *header_text;
169    char *env_top;
170    char **preset_argv;
171    int  preset_argc = 0;
172    char **av;
173    int  ac;
174    char dostates = No;
175    char do_unames = Yes;
176    char interactive = Maybe;
177    char warnings = 0;
178#if Default_TOPN == Infinity
179    char topn_specified = No;
180#endif
181    char ch;
182    char *iptr;
183    char no_command = 1;
184    struct timeval timeout;
185#ifdef ORDER
186    char *order_name = NULL;
187    int order_index = 0;
188#endif
189#ifndef FD_SET
190    /* FD_SET and friends are not present:  fake it */
191    typedef int fd_set;
192#define FD_ZERO(x)     (*(x) = 0)
193#define FD_SET(f, x)   (*(x) = 1<<f)
194#endif
195    fd_set readfds;
196
197#ifdef ORDER
198    static char command_chars[] = "\f qh?en#sdkriIutHmSCajo";
199#else
200    static char command_chars[] = "\f qh?en#sdkriIutHmSCaj";
201#endif
202/* these defines enumerate the "strchr"s of the commands in command_chars */
203#define CMD_redraw	0
204#define CMD_update	1
205#define CMD_quit	2
206#define CMD_help1	3
207#define CMD_help2	4
208#define CMD_OSLIMIT	4    /* terminals with OS can only handle commands */
209#define CMD_errors	5    /* less than or equal to CMD_OSLIMIT	   */
210#define CMD_number1	6
211#define CMD_number2	7
212#define CMD_delay	8
213#define CMD_displays	9
214#define CMD_kill	10
215#define CMD_renice	11
216#define CMD_idletog     12
217#define CMD_idletog2    13
218#define CMD_user	14
219#define CMD_selftog	15
220#define CMD_thrtog	16
221#define CMD_viewtog	17
222#define CMD_viewsys	18
223#define	CMD_wcputog	19
224#define	CMD_showargs	20
225#define	CMD_jidtog	21
226#ifdef ORDER
227#define CMD_order       22
228#endif
229
230    /* set the buffer for stdout */
231#ifdef DEBUG
232    extern FILE *debug;
233    debug = fopen("debug.run", "w");
234    setbuffer(stdout, NULL, 0);
235#else
236    setbuffer(stdout, stdoutbuf, Buffersize);
237#endif
238
239    /* get our name */
240    if (argc > 0)
241    {
242	if ((myname = strrchr(argv[0], '/')) == 0)
243	{
244	    myname = argv[0];
245	}
246	else
247	{
248	    myname++;
249	}
250    }
251
252    /* initialize some selection options */
253    ps.idle    = Yes;
254    ps.self    = -1;
255    ps.system  = No;
256    ps.uid     = -1;
257    ps.thread  = No;
258    ps.wcpu    = 1;
259    ps.jail    = No;
260    ps.command = NULL;
261
262    /* get preset options from the environment */
263    if ((env_top = getenv("TOP")) != NULL)
264    {
265	av = preset_argv = argparse(env_top, &preset_argc);
266	ac = preset_argc;
267
268	/* set the dummy argument to an explanatory message, in case
269	   getopt encounters a bad argument */
270	preset_argv[0] = "while processing environment";
271    }
272
273    /* process options */
274    do {
275	/* if we're done doing the presets, then process the real arguments */
276	if (preset_argc == 0)
277	{
278	    ac = argc;
279	    av = argv;
280
281	    /* this should keep getopt happy... */
282	    optind = 1;
283	}
284
285	while ((i = getopt(ac, av, "CSIHabijnquvs:d:U:m:o:t")) != EOF)
286	{
287	    switch(i)
288	    {
289	      case 'v':			/* show version number */
290		fprintf(stderr, "%s: version %s\n",
291			myname, version_string());
292		exit(1);
293		break;
294
295	      case 'u':			/* toggle uid/username display */
296		do_unames = !do_unames;
297		break;
298
299	      case 'U':			/* display only username's processes */
300		if ((ps.uid = userid(optarg)) == -1)
301		{
302		    fprintf(stderr, "%s: unknown user\n", optarg);
303		    exit(1);
304		}
305		break;
306
307	      case 'S':			/* show system processes */
308		ps.system = !ps.system;
309		break;
310
311	      case 'I':                   /* show idle processes */
312		ps.idle = !ps.idle;
313		break;
314
315	      case 'i':			/* go interactive regardless */
316		interactive = Yes;
317		break;
318
319	      case 'n':			/* batch, or non-interactive */
320	      case 'b':
321		interactive = No;
322		break;
323
324	      case 'a':
325		fmt_flags ^= FMT_SHOWARGS;
326		break;
327
328	      case 'd':			/* number of displays to show */
329		if ((i = atoiwi(optarg)) == Invalid || i == 0)
330		{
331		    fprintf(stderr,
332			"%s: warning: display count should be positive -- option ignored\n",
333			myname);
334		    warnings++;
335		}
336		else
337		{
338		    displays = i;
339		}
340		break;
341
342	      case 's':
343		if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
344		{
345		    fprintf(stderr,
346			"%s: warning: seconds delay should be positive -- using default\n",
347			myname);
348		    delay = Default_DELAY;
349		    warnings++;
350		}
351		break;
352
353	      case 'q':		/* be quick about it */
354		/* only allow this if user is really root */
355		if (getuid() == 0)
356		{
357		    /* be very un-nice! */
358		    (void) nice(-20);
359		}
360		else
361		{
362		    fprintf(stderr,
363			"%s: warning: `-q' option can only be used by root\n",
364			myname);
365		    warnings++;
366		}
367		break;
368
369	      case 'm':		/* select display mode */
370		if (strcmp(optarg, "io") == 0) {
371			displaymode = DISP_IO;
372		} else if (strcmp(optarg, "cpu") == 0) {
373			displaymode = DISP_CPU;
374		} else {
375			fprintf(stderr,
376			"%s: warning: `-m' option can only take args "
377			"'io' or 'cpu'\n",
378			myname);
379			exit(1);
380		}
381		break;
382
383	      case 'o':		/* select sort order */
384#ifdef ORDER
385		order_name = optarg;
386#else
387		fprintf(stderr,
388			"%s: this platform does not support arbitrary ordering.  Sorry.\n",
389			myname);
390		warnings++;
391#endif
392		break;
393
394	      case 't':
395		ps.self = (ps.self == -1) ? getpid() : -1;
396		break;
397
398	      case 'C':
399		ps.wcpu = !ps.wcpu;
400		break;
401
402	      case 'H':
403		ps.thread = !ps.thread;
404		break;
405
406	      case 'j':
407		ps.jail = !ps.jail;
408		break;
409
410	      default:
411		fprintf(stderr,
412"Top version %s\n"
413"Usage: %s [-abCHIijnqStuv] [-d count] [-m io | cpu] [-o field] [-s time]\n"
414"       [-U username] [number]\n",
415			version_string(), myname);
416		exit(1);
417	    }
418	}
419
420	/* get count of top processes to display (if any) */
421	if (optind < ac)
422	{
423	    if ((topn = atoiwi(av[optind])) == Invalid)
424	    {
425		fprintf(stderr,
426			"%s: warning: process display count should be non-negative -- using default\n",
427			myname);
428		warnings++;
429	    }
430#if Default_TOPN == Infinity
431            else
432	    {
433		topn_specified = Yes;
434	    }
435#endif
436	}
437
438	/* tricky:  remember old value of preset_argc & set preset_argc = 0 */
439	i = preset_argc;
440	preset_argc = 0;
441
442    /* repeat only if we really did the preset arguments */
443    } while (i != 0);
444
445    /* set constants for username/uid display correctly */
446    if (!do_unames)
447    {
448	uname_field = "   UID  ";
449	get_userid = itoa7;
450    }
451
452    /* initialize the kernel memory interface */
453    if (machine_init(&statics) == -1)
454    {
455	exit(1);
456    }
457
458#ifdef ORDER
459    /* determine sorting order index, if necessary */
460    if (order_name != NULL)
461    {
462	if ((order_index = string_index(order_name, statics.order_names)) == -1)
463	{
464	    char **pp;
465
466	    fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
467		    myname, order_name);
468	    fprintf(stderr, "\tTry one of these:");
469	    pp = statics.order_names;
470	    while (*pp != NULL)
471	    {
472		fprintf(stderr, " %s", *pp++);
473	    }
474	    fputc('\n', stderr);
475	    exit(1);
476	}
477    }
478#endif
479
480#ifdef no_initialization_needed
481    /* initialize the hashing stuff */
482    if (do_unames)
483    {
484	init_hash();
485    }
486#endif
487
488    /* initialize termcap */
489    init_termcap(interactive);
490
491    /* get the string to use for the process area header */
492    header_text = format_header(uname_field);
493
494    /* initialize display interface */
495    if ((max_topn = display_init(&statics)) == -1)
496    {
497	fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
498	exit(4);
499    }
500
501    /* print warning if user requested more processes than we can display */
502    if (topn > max_topn)
503    {
504	fprintf(stderr,
505		"%s: warning: this terminal can only display %d processes.\n",
506		myname, max_topn);
507	warnings++;
508    }
509
510    /* adjust for topn == Infinity */
511    if (topn == Infinity)
512    {
513	/*
514	 *  For smart terminals, infinity really means everything that can
515	 *  be displayed, or Largest.
516	 *  On dumb terminals, infinity means every process in the system!
517	 *  We only really want to do that if it was explicitly specified.
518	 *  This is always the case when "Default_TOPN != Infinity".  But if
519	 *  topn wasn't explicitly specified and we are on a dumb terminal
520	 *  and the default is Infinity, then (and only then) we use
521	 *  "Nominal_TOPN" instead.
522	 */
523#if Default_TOPN == Infinity
524	topn = smart_terminal ? Largest :
525		    (topn_specified ? Largest : Nominal_TOPN);
526#else
527	topn = Largest;
528#endif
529    }
530
531    /* set header display accordingly */
532    display_header(topn > 0);
533
534    /* determine interactive state */
535    if (interactive == Maybe)
536    {
537	interactive = smart_terminal;
538    }
539
540    /* if # of displays not specified, fill it in */
541    if (displays == 0)
542    {
543	displays = smart_terminal ? Infinity : 1;
544    }
545
546    /* hold interrupt signals while setting up the screen and the handlers */
547#ifdef SIGHOLD
548    sighold(SIGINT);
549    sighold(SIGQUIT);
550    sighold(SIGTSTP);
551#else
552    old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
553#endif
554    init_screen();
555    (void) signal(SIGINT, leave);
556    (void) signal(SIGQUIT, leave);
557    (void) signal(SIGTSTP, tstop);
558#ifdef SIGWINCH
559    (void) signal(SIGWINCH, winch);
560#endif
561#ifdef SIGRELSE
562    sigrelse(SIGINT);
563    sigrelse(SIGQUIT);
564    sigrelse(SIGTSTP);
565#else
566    (void) sigsetmask(old_sigmask);
567#endif
568    if (warnings)
569    {
570	fputs("....", stderr);
571	fflush(stderr);			/* why must I do this? */
572	sleep((unsigned)(3 * warnings));
573	fputc('\n', stderr);
574    }
575
576restart:
577
578    /*
579     *  main loop -- repeat while display count is positive or while it
580     *		indicates infinity (by being -1)
581     */
582
583    while ((displays == -1) || (displays-- > 0))
584    {
585	int (*compare)();
586
587
588	/* get the current stats */
589	get_system_info(&system_info);
590
591#ifdef ORDER
592	compare = compares[order_index];
593#else
594	if (displaymode == DISP_CPU)
595		compare = proc_compare;
596	else
597		compare = io_compare;
598#endif
599
600	/* get the current set of processes */
601	processes =
602		get_process_info(&system_info, &ps, compare);
603
604	/* display the load averages */
605	(*d_loadave)(system_info.last_pid,
606		     system_info.load_avg);
607
608	/* display the current time */
609	/* this method of getting the time SHOULD be fairly portable */
610	time(&curr_time);
611	i_uptime(&system_info.boottime, &curr_time);
612	i_timeofday(&curr_time);
613
614	/* display process state breakdown */
615	(*d_procstates)(system_info.p_total,
616			system_info.procstates);
617
618	/* display the cpu state percentage breakdown */
619	if (dostates)	/* but not the first time */
620	{
621	    (*d_cpustates)(system_info.cpustates);
622	}
623	else
624	{
625	    /* we'll do it next time */
626	    if (smart_terminal)
627	    {
628		z_cpustates();
629	    }
630	    else
631	    {
632		putchar('\n');
633	    }
634	    dostates = Yes;
635	}
636
637	/* display memory stats */
638	(*d_memory)(system_info.memory);
639
640	/* display swap stats */
641	(*d_swap)(system_info.swap);
642
643	/* handle message area */
644	(*d_message)();
645
646	/* update the header area */
647	(*d_header)(header_text);
648
649	if (topn > 0)
650	{
651	    /* determine number of processes to actually display */
652	    /* this number will be the smallest of:  active processes,
653	       number user requested, number current screen accomodates */
654	    active_procs = system_info.P_ACTIVE;
655	    if (active_procs > topn)
656	    {
657		active_procs = topn;
658	    }
659	    if (active_procs > max_topn)
660	    {
661		active_procs = max_topn;
662	    }
663
664	    /* now show the top "n" processes. */
665	    for (i = 0; i < active_procs; i++)
666	    {
667		(*d_process)(i, format_next_process(processes, get_userid,
668			     fmt_flags));
669	    }
670	}
671	else
672	{
673	    i = 0;
674	}
675
676	/* do end-screen processing */
677	u_endscreen(i);
678
679	/* now, flush the output buffer */
680	if (fflush(stdout) != 0)
681	{
682	    new_message(MT_standout, " Write error on stdout");
683	    putchar('\r');
684	    quit(1);
685	    /*NOTREACHED*/
686	}
687
688	/* only do the rest if we have more displays to show */
689	if (displays)
690	{
691	    /* switch out for new display on smart terminals */
692	    if (smart_terminal)
693	    {
694		if (overstrike)
695		{
696		    reset_display();
697		}
698		else
699		{
700		    d_loadave = u_loadave;
701		    d_procstates = u_procstates;
702		    d_cpustates = u_cpustates;
703		    d_memory = u_memory;
704		    d_swap = u_swap;
705		    d_message = u_message;
706		    d_header = u_header;
707		    d_process = u_process;
708		}
709	    }
710
711	    no_command = Yes;
712	    if (!interactive)
713	    {
714		/* set up alarm */
715		(void) signal(SIGALRM, onalrm);
716		(void) alarm((unsigned)delay);
717
718		/* wait for the rest of it .... */
719		pause();
720	    }
721	    else while (no_command)
722	    {
723		/* assume valid command unless told otherwise */
724		no_command = No;
725
726		/* set up arguments for select with timeout */
727		FD_ZERO(&readfds);
728		FD_SET(0, &readfds);		/* for standard input */
729		timeout.tv_sec  = delay;
730		timeout.tv_usec = 0;
731
732		if (leaveflag) {
733		    end_screen();
734		    exit(0);
735		}
736
737		if (tstopflag) {
738		    /* move to the lower left */
739		    end_screen();
740		    fflush(stdout);
741
742		    /* default the signal handler action */
743		    (void) signal(SIGTSTP, SIG_DFL);
744
745		    /* unblock the signal and send ourselves one */
746#ifdef SIGRELSE
747		    sigrelse(SIGTSTP);
748#else
749		    (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
750#endif
751		    (void) kill(0, SIGTSTP);
752
753		    /* reset the signal handler */
754		    (void) signal(SIGTSTP, tstop);
755
756		    /* reinit screen */
757		    reinit_screen();
758		    reset_display();
759		    tstopflag = 0;
760		    goto restart;
761		}
762
763		if (winchflag) {
764		    /* reascertain the screen dimensions */
765		    get_screensize();
766
767		    /* tell display to resize */
768		    max_topn = display_resize();
769
770		    /* reset the signal handler */
771		    (void) signal(SIGWINCH, winch);
772
773		    reset_display();
774		    winchflag = 0;
775		    goto restart;
776		}
777
778		/* wait for either input or the end of the delay period */
779		sel_ret = select(2, &readfds, NULL, NULL, &timeout);
780		if (sel_ret < 0 && errno != EINTR)
781		    quit(0);
782		if (sel_ret > 0)
783		{
784		    int newval;
785		    char *errmsg;
786
787		    /* something to read -- clear the message area first */
788		    clear_message();
789
790		    /* now read it and convert to command strchr */
791		    /* (use "change" as a temporary to hold strchr) */
792		    if (read(0, &ch, 1) != 1)
793		    {
794			/* read error: either 0 or -1 */
795			new_message(MT_standout, " Read error on stdin");
796			putchar('\r');
797			quit(1);
798			/*NOTREACHED*/
799		    }
800		    if ((iptr = strchr(command_chars, ch)) == NULL)
801		    {
802			if (ch != '\r' && ch != '\n')
803			{
804			    /* illegal command */
805			    new_message(MT_standout, " Command not understood");
806			}
807			putchar('\r');
808			no_command = Yes;
809		    }
810		    else
811		    {
812			change = iptr - command_chars;
813			if (overstrike && change > CMD_OSLIMIT)
814			{
815			    /* error */
816			    new_message(MT_standout,
817			    " Command cannot be handled by this terminal");
818			    putchar('\r');
819			    no_command = Yes;
820			}
821			else switch(change)
822			{
823			    case CMD_redraw:	/* redraw screen */
824				reset_display();
825				break;
826
827			    case CMD_update:	/* merely update display */
828				/* is the load average high? */
829				if (system_info.load_avg[0] > LoadMax)
830				{
831				    /* yes, go home for visual feedback */
832				    go_home();
833				    fflush(stdout);
834				}
835				break;
836
837			    case CMD_quit:	/* quit */
838				quit(0);
839				/*NOTREACHED*/
840				break;
841
842			    case CMD_help1:	/* help */
843			    case CMD_help2:
844				reset_display();
845				clear();
846				show_help();
847				standout("Hit any key to continue: ");
848				fflush(stdout);
849				(void) read(0, &ch, 1);
850				break;
851
852			    case CMD_errors:	/* show errors */
853				if (error_count() == 0)
854				{
855				    new_message(MT_standout,
856					" Currently no errors to report.");
857				    putchar('\r');
858				    no_command = Yes;
859				}
860				else
861				{
862				    reset_display();
863				    clear();
864				    show_errors();
865				    standout("Hit any key to continue: ");
866				    fflush(stdout);
867				    (void) read(0, &ch, 1);
868				}
869				break;
870
871			    case CMD_number1:	/* new number */
872			    case CMD_number2:
873				new_message(MT_standout,
874				    "Number of processes to show: ");
875				newval = readline(tempbuf1, 8, Yes);
876				if (newval > -1)
877				{
878				    if (newval > max_topn)
879				    {
880					new_message(MT_standout | MT_delayed,
881					  " This terminal can only display %d processes.",
882					  max_topn);
883					putchar('\r');
884				    }
885
886				    if (newval == 0)
887				    {
888					/* inhibit the header */
889					display_header(No);
890				    }
891				    else if (newval > topn && topn == 0)
892				    {
893					/* redraw the header */
894					display_header(Yes);
895					d_header = i_header;
896				    }
897				    topn = newval;
898				}
899				break;
900
901			    case CMD_delay:	/* new seconds delay */
902				new_message(MT_standout, "Seconds to delay: ");
903				if ((i = readline(tempbuf1, 8, Yes)) > -1)
904				{
905				    if ((delay = i) == 0 && getuid() != 0)
906				    {
907					delay = 1;
908				    }
909				}
910				clear_message();
911				break;
912
913			    case CMD_displays:	/* change display count */
914				new_message(MT_standout,
915					"Displays to show (currently %s): ",
916					displays == -1 ? "infinite" :
917							 itoa(displays));
918				if ((i = readline(tempbuf1, 10, Yes)) > 0)
919				{
920				    displays = i;
921				}
922				else if (i == 0)
923				{
924				    quit(0);
925				}
926				clear_message();
927				break;
928
929			    case CMD_kill:	/* kill program */
930				new_message(0, "kill ");
931				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
932				{
933				    if ((errmsg = kill_procs(tempbuf2)) != NULL)
934				    {
935					new_message(MT_standout, "%s", errmsg);
936					putchar('\r');
937					no_command = Yes;
938				    }
939				}
940				else
941				{
942				    clear_message();
943				}
944				break;
945
946			    case CMD_renice:	/* renice program */
947				new_message(0, "renice ");
948				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
949				{
950				    if ((errmsg = renice_procs(tempbuf2)) != NULL)
951				    {
952					new_message(MT_standout, "%s", errmsg);
953					putchar('\r');
954					no_command = Yes;
955				    }
956				}
957				else
958				{
959				    clear_message();
960				}
961				break;
962
963			    case CMD_idletog:
964			    case CMD_idletog2:
965				ps.idle = !ps.idle;
966				new_message(MT_standout | MT_delayed,
967				    " %sisplaying idle processes.",
968				    ps.idle ? "D" : "Not d");
969				putchar('\r');
970				break;
971
972			    case CMD_selftog:
973				ps.self = (ps.self == -1) ? getpid() : -1;
974				new_message(MT_standout | MT_delayed,
975				    " %sisplaying self.",
976				    (ps.self == -1) ? "D" : "Not d");
977				putchar('\r');
978				break;
979
980			    case CMD_user:
981				new_message(MT_standout,
982				    "Username to show: ");
983				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
984				{
985				    if (tempbuf2[0] == '+' &&
986					tempbuf2[1] == '\0')
987				    {
988					ps.uid = -1;
989				    }
990				    else if ((i = userid(tempbuf2)) == -1)
991				    {
992					new_message(MT_standout,
993					    " %s: unknown user", tempbuf2);
994					no_command = Yes;
995				    }
996				    else
997				    {
998					ps.uid = i;
999				    }
1000				    putchar('\r');
1001				}
1002				else
1003				{
1004				    clear_message();
1005				}
1006				break;
1007
1008			    case CMD_thrtog:
1009				ps.thread = !ps.thread;
1010				new_message(MT_standout | MT_delayed,
1011				    "Displaying threads %s",
1012				    ps.thread ? "separately" : "as a count");
1013				header_text = format_header(uname_field);
1014				reset_display();
1015				putchar('\r');
1016				break;
1017			    case CMD_wcputog:
1018				ps.wcpu = !ps.wcpu;
1019				new_message(MT_standout | MT_delayed,
1020				    "Displaying %sCPU",
1021				    ps.wcpu ? "W" : "");
1022				header_text = format_header(uname_field);
1023				reset_display();
1024				putchar('\r');
1025				break;
1026			    case CMD_viewtog:
1027				if (++displaymode == DISP_MAX)
1028					displaymode = 0;
1029				header_text = format_header(uname_field);
1030				display_header(Yes);
1031				d_header = i_header;
1032				reset_display();
1033				break;
1034			    case CMD_viewsys:
1035				ps.system = !ps.system;
1036				break;
1037			    case CMD_showargs:
1038				fmt_flags ^= FMT_SHOWARGS;
1039				break;
1040#ifdef ORDER
1041			    case CMD_order:
1042				new_message(MT_standout,
1043				    "Order to sort: ");
1044				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1045				{
1046				  if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1047					{
1048					  new_message(MT_standout,
1049					      " %s: unrecognized sorting order", tempbuf2);
1050					  no_command = Yes;
1051				    }
1052				    else
1053				    {
1054					order_index = i;
1055				    }
1056				    putchar('\r');
1057				}
1058				else
1059				{
1060				    clear_message();
1061				}
1062				break;
1063#endif
1064			    case CMD_jidtog:
1065				ps.jail = !ps.jail;
1066				new_message(MT_standout | MT_delayed,
1067				    " %sisplaying jail ID.",
1068				    ps.jail ? "D" : "Not d");
1069				header_text = format_header(uname_field);
1070				reset_display();
1071				putchar('\r');
1072				break;
1073
1074			    default:
1075				new_message(MT_standout, " BAD CASE IN SWITCH!");
1076				putchar('\r');
1077			}
1078		    }
1079
1080		    /* flush out stuff that may have been written */
1081		    fflush(stdout);
1082		}
1083	    }
1084	}
1085    }
1086
1087#ifdef DEBUG
1088    fclose(debug);
1089#endif
1090    quit(0);
1091    /*NOTREACHED*/
1092}
1093
1094/*
1095 *  reset_display() - reset all the display routine pointers so that entire
1096 *	screen will get redrawn.
1097 */
1098
1099reset_display()
1100
1101{
1102    d_loadave    = i_loadave;
1103    d_procstates = i_procstates;
1104    d_cpustates  = i_cpustates;
1105    d_memory     = i_memory;
1106    d_swap       = i_swap;
1107    d_message	 = i_message;
1108    d_header	 = i_header;
1109    d_process	 = i_process;
1110}
1111
1112/*
1113 *  signal handlers
1114 */
1115
1116sigret_t leave()	/* exit under normal conditions -- INT handler */
1117
1118{
1119    leaveflag = 1;
1120}
1121
1122sigret_t tstop(i)	/* SIGTSTP handler */
1123
1124int i;
1125
1126{
1127    tstopflag = 1;
1128}
1129
1130#ifdef SIGWINCH
1131sigret_t winch(i)		/* SIGWINCH handler */
1132
1133int i;
1134
1135{
1136    winchflag = 1;
1137}
1138#endif
1139
1140void quit(status)		/* exit under duress */
1141
1142int status;
1143
1144{
1145    end_screen();
1146    exit(status);
1147    /*NOTREACHED*/
1148}
1149
1150sigret_t onalrm()	/* SIGALRM handler */
1151
1152{
1153    /* this is only used in batch mode to break out of the pause() */
1154    /* return; */
1155}
1156
1157