top.c revision 224204 
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 224204 2011-07-18 21:08:14Z jhb $
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;
69int pcpu_stats = No;
70
71/* signal handling routines */
72sigret_t leave();
73sigret_t onalrm();
74sigret_t tstop();
75#ifdef SIGWINCH
76sigret_t winch();
77#endif
78
79volatile sig_atomic_t leaveflag;
80volatile sig_atomic_t tstopflag;
81volatile sig_atomic_t winchflag;
82
83/* internal routines */
84void quit();
85
86/* values which need to be accessed by signal handlers */
87static int max_topn;		/* maximum displayable processes */
88
89/* miscellaneous things */
90struct process_select ps;
91char *myname = "top";
92jmp_buf jmp_int;
93
94/* routines that don't return int */
95
96char *username();
97char *ctime();
98char *kill_procs();
99char *renice_procs();
100
101#ifdef ORDER
102extern int (*compares[])();
103#else
104extern int proc_compare();
105extern int io_compare();
106#endif
107time_t time();
108
109caddr_t get_process_info();
110
111/* different routines for displaying the user's identification */
112/* (values assigned to get_userid) */
113char *username();
114char *itoa7();
115
116/* display routines that need to be predeclared */
117int i_loadave();
118int u_loadave();
119int i_procstates();
120int u_procstates();
121int i_cpustates();
122int u_cpustates();
123int i_memory();
124int u_memory();
125int i_swap();
126int u_swap();
127int i_message();
128int u_message();
129int i_header();
130int u_header();
131int i_process();
132int u_process();
133
134/* pointers to display routines */
135int (*d_loadave)() = i_loadave;
136int (*d_procstates)() = i_procstates;
137int (*d_cpustates)() = i_cpustates;
138int (*d_memory)() = i_memory;
139int (*d_swap)() = i_swap;
140int (*d_message)() = i_message;
141int (*d_header)() = i_header;
142int (*d_process)() = i_process;
143
144
145main(argc, argv)
146
147int  argc;
148char *argv[];
149
150{
151    register int i;
152    register int active_procs;
153    register int change;
154
155    struct system_info system_info;
156    struct statics statics;
157    caddr_t processes;
158
159    static char tempbuf1[50];
160    static char tempbuf2[50];
161    int old_sigmask;		/* only used for BSD-style signals */
162    int topn = Default_TOPN;
163    int delay = Default_DELAY;
164    int displays = 0;		/* indicates unspecified */
165    int sel_ret = 0;
166    time_t curr_time;
167    char *(*get_userid)() = username;
168    char *uname_field = "USERNAME";
169    char *header_text;
170    char *env_top;
171    char **preset_argv;
172    int  preset_argc = 0;
173    char **av;
174    int  ac;
175    char dostates = No;
176    char do_unames = Yes;
177    char interactive = Maybe;
178    char warnings = 0;
179#if Default_TOPN == Infinity
180    char topn_specified = No;
181#endif
182    char ch;
183    char *iptr;
184    char no_command = 1;
185    struct timeval timeout;
186#ifdef ORDER
187    char *order_name = NULL;
188    int order_index = 0;
189#endif
190#ifndef FD_SET
191    /* FD_SET and friends are not present:  fake it */
192    typedef int fd_set;
193#define FD_ZERO(x)     (*(x) = 0)
194#define FD_SET(f, x)   (*(x) = 1<<f)
195#endif
196    fd_set readfds;
197
198#ifdef ORDER
199    static char command_chars[] = "\f qh?en#sdkriIutHmSCajzPo";
200#else
201    static char command_chars[] = "\f qh?en#sdkriIutHmSCajzP";
202#endif
203/* these defines enumerate the "strchr"s of the commands in command_chars */
204#define CMD_redraw	0
205#define CMD_update	1
206#define CMD_quit	2
207#define CMD_help1	3
208#define CMD_help2	4
209#define CMD_OSLIMIT	4    /* terminals with OS can only handle commands */
210#define CMD_errors	5    /* less than or equal to CMD_OSLIMIT	   */
211#define CMD_number1	6
212#define CMD_number2	7
213#define CMD_delay	8
214#define CMD_displays	9
215#define CMD_kill	10
216#define CMD_renice	11
217#define CMD_idletog     12
218#define CMD_idletog2    13
219#define CMD_user	14
220#define CMD_selftog	15
221#define CMD_thrtog	16
222#define CMD_viewtog	17
223#define CMD_viewsys	18
224#define	CMD_wcputog	19
225#define	CMD_showargs	20
226#define	CMD_jidtog	21
227#define CMD_kidletog	22
228#define CMD_pcputog	23
229#ifdef ORDER
230#define CMD_order       24
231#endif
232
233    /* set the buffer for stdout */
234#ifdef DEBUG
235    extern FILE *debug;
236    debug = fopen("debug.run", "w");
237    setbuffer(stdout, NULL, 0);
238#else
239    setbuffer(stdout, stdoutbuf, Buffersize);
240#endif
241
242    /* get our name */
243    if (argc > 0)
244    {
245	if ((myname = strrchr(argv[0], '/')) == 0)
246	{
247	    myname = argv[0];
248	}
249	else
250	{
251	    myname++;
252	}
253    }
254
255    /* initialize some selection options */
256    ps.idle    = Yes;
257    ps.self    = -1;
258    ps.system  = No;
259    ps.uid     = -1;
260    ps.thread  = No;
261    ps.wcpu    = 1;
262    ps.jail    = No;
263    ps.kidle   = Yes;
264    ps.command = NULL;
265
266    /* get preset options from the environment */
267    if ((env_top = getenv("TOP")) != NULL)
268    {
269	av = preset_argv = argparse(env_top, &preset_argc);
270	ac = preset_argc;
271
272	/* set the dummy argument to an explanatory message, in case
273	   getopt encounters a bad argument */
274	preset_argv[0] = "while processing environment";
275    }
276
277    /* process options */
278    do {
279	/* if we're done doing the presets, then process the real arguments */
280	if (preset_argc == 0)
281	{
282	    ac = argc;
283	    av = argv;
284
285	    /* this should keep getopt happy... */
286	    optind = 1;
287	}
288
289	while ((i = getopt(ac, av, "CSIHPabijnquvzs:d:U:m:o:t")) != EOF)
290	{
291	    switch(i)
292	    {
293	      case 'v':			/* show version number */
294		fprintf(stderr, "%s: version %s\n",
295			myname, version_string());
296		exit(1);
297		break;
298
299	      case 'u':			/* toggle uid/username display */
300		do_unames = !do_unames;
301		break;
302
303	      case 'U':			/* display only username's processes */
304		if ((ps.uid = userid(optarg)) == -1)
305		{
306		    fprintf(stderr, "%s: unknown user\n", optarg);
307		    exit(1);
308		}
309		break;
310
311	      case 'S':			/* show system processes */
312		ps.system = !ps.system;
313		break;
314
315	      case 'I':                   /* show idle processes */
316		ps.idle = !ps.idle;
317		break;
318
319	      case 'i':			/* go interactive regardless */
320		interactive = Yes;
321		break;
322
323	      case 'n':			/* batch, or non-interactive */
324	      case 'b':
325		interactive = No;
326		break;
327
328	      case 'a':
329		fmt_flags ^= FMT_SHOWARGS;
330		break;
331
332	      case 'd':			/* number of displays to show */
333		if ((i = atoiwi(optarg)) == Invalid || i == 0)
334		{
335		    fprintf(stderr,
336			"%s: warning: display count should be positive -- option ignored\n",
337			myname);
338		    warnings++;
339		}
340		else
341		{
342		    displays = i;
343		}
344		break;
345
346	      case 's':
347		if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
348		{
349		    fprintf(stderr,
350			"%s: warning: seconds delay should be positive -- using default\n",
351			myname);
352		    delay = Default_DELAY;
353		    warnings++;
354		}
355		break;
356
357	      case 'q':		/* be quick about it */
358		/* only allow this if user is really root */
359		if (getuid() == 0)
360		{
361		    /* be very un-nice! */
362		    (void) nice(-20);
363		}
364		else
365		{
366		    fprintf(stderr,
367			"%s: warning: `-q' option can only be used by root\n",
368			myname);
369		    warnings++;
370		}
371		break;
372
373	      case 'm':		/* select display mode */
374		if (strcmp(optarg, "io") == 0) {
375			displaymode = DISP_IO;
376		} else if (strcmp(optarg, "cpu") == 0) {
377			displaymode = DISP_CPU;
378		} else {
379			fprintf(stderr,
380			"%s: warning: `-m' option can only take args "
381			"'io' or 'cpu'\n",
382			myname);
383			exit(1);
384		}
385		break;
386
387	      case 'o':		/* select sort order */
388#ifdef ORDER
389		order_name = optarg;
390#else
391		fprintf(stderr,
392			"%s: this platform does not support arbitrary ordering.  Sorry.\n",
393			myname);
394		warnings++;
395#endif
396		break;
397
398	      case 't':
399		ps.self = (ps.self == -1) ? getpid() : -1;
400		break;
401
402	      case 'C':
403		ps.wcpu = !ps.wcpu;
404		break;
405
406	      case 'H':
407		ps.thread = !ps.thread;
408		break;
409
410	      case 'j':
411		ps.jail = !ps.jail;
412		break;
413
414	      case 'P':
415		pcpu_stats = !pcpu_stats;
416		break;
417
418	      case 'z':
419		ps.kidle = !ps.kidle;
420		break;
421
422	      default:
423		fprintf(stderr,
424"Top version %s\n"
425"Usage: %s [-abCHIijnPqStuvz] [-d count] [-m io | cpu] [-o field] [-s time]\n"
426"       [-U username] [number]\n",
427			version_string(), myname);
428		exit(1);
429	    }
430	}
431
432	/* get count of top processes to display (if any) */
433	if (optind < ac)
434	{
435	    if ((topn = atoiwi(av[optind])) == Invalid)
436	    {
437		fprintf(stderr,
438			"%s: warning: process display count should be non-negative -- using default\n",
439			myname);
440		warnings++;
441	    }
442#if Default_TOPN == Infinity
443            else
444	    {
445		topn_specified = Yes;
446	    }
447#endif
448	}
449
450	/* tricky:  remember old value of preset_argc & set preset_argc = 0 */
451	i = preset_argc;
452	preset_argc = 0;
453
454    /* repeat only if we really did the preset arguments */
455    } while (i != 0);
456
457    /* set constants for username/uid display correctly */
458    if (!do_unames)
459    {
460	uname_field = "   UID  ";
461	get_userid = itoa7;
462    }
463
464    /* initialize the kernel memory interface */
465    if (machine_init(&statics, do_unames) == -1)
466    {
467	exit(1);
468    }
469
470#ifdef ORDER
471    /* determine sorting order index, if necessary */
472    if (order_name != NULL)
473    {
474	if ((order_index = string_index(order_name, statics.order_names)) == -1)
475	{
476	    char **pp;
477
478	    fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
479		    myname, order_name);
480	    fprintf(stderr, "\tTry one of these:");
481	    pp = statics.order_names;
482	    while (*pp != NULL)
483	    {
484		fprintf(stderr, " %s", *pp++);
485	    }
486	    fputc('\n', stderr);
487	    exit(1);
488	}
489    }
490#endif
491
492#ifdef no_initialization_needed
493    /* initialize the hashing stuff */
494    if (do_unames)
495    {
496	init_hash();
497    }
498#endif
499
500    /* initialize termcap */
501    init_termcap(interactive);
502
503    /* get the string to use for the process area header */
504    header_text = format_header(uname_field);
505
506    /* initialize display interface */
507    if ((max_topn = display_init(&statics)) == -1)
508    {
509	fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
510	exit(4);
511    }
512
513    /* print warning if user requested more processes than we can display */
514    if (topn > max_topn)
515    {
516	fprintf(stderr,
517		"%s: warning: this terminal can only display %d processes.\n",
518		myname, max_topn);
519	warnings++;
520    }
521
522    /* adjust for topn == Infinity */
523    if (topn == Infinity)
524    {
525	/*
526	 *  For smart terminals, infinity really means everything that can
527	 *  be displayed, or Largest.
528	 *  On dumb terminals, infinity means every process in the system!
529	 *  We only really want to do that if it was explicitly specified.
530	 *  This is always the case when "Default_TOPN != Infinity".  But if
531	 *  topn wasn't explicitly specified and we are on a dumb terminal
532	 *  and the default is Infinity, then (and only then) we use
533	 *  "Nominal_TOPN" instead.
534	 */
535#if Default_TOPN == Infinity
536	topn = smart_terminal ? Largest :
537		    (topn_specified ? Largest : Nominal_TOPN);
538#else
539	topn = Largest;
540#endif
541    }
542
543    /* set header display accordingly */
544    display_header(topn > 0);
545
546    /* determine interactive state */
547    if (interactive == Maybe)
548    {
549	interactive = smart_terminal;
550    }
551
552    /* if # of displays not specified, fill it in */
553    if (displays == 0)
554    {
555	displays = smart_terminal ? Infinity : 1;
556    }
557
558    /* hold interrupt signals while setting up the screen and the handlers */
559#ifdef SIGHOLD
560    sighold(SIGINT);
561    sighold(SIGQUIT);
562    sighold(SIGTSTP);
563#else
564    old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
565#endif
566    init_screen();
567    (void) signal(SIGINT, leave);
568    (void) signal(SIGQUIT, leave);
569    (void) signal(SIGTSTP, tstop);
570#ifdef SIGWINCH
571    (void) signal(SIGWINCH, winch);
572#endif
573#ifdef SIGRELSE
574    sigrelse(SIGINT);
575    sigrelse(SIGQUIT);
576    sigrelse(SIGTSTP);
577#else
578    (void) sigsetmask(old_sigmask);
579#endif
580    if (warnings)
581    {
582	fputs("....", stderr);
583	fflush(stderr);			/* why must I do this? */
584	sleep((unsigned)(3 * warnings));
585	fputc('\n', stderr);
586    }
587
588restart:
589
590    /*
591     *  main loop -- repeat while display count is positive or while it
592     *		indicates infinity (by being -1)
593     */
594
595    while ((displays == -1) || (displays-- > 0))
596    {
597	int (*compare)();
598
599
600	/* get the current stats */
601	get_system_info(&system_info);
602
603#ifdef ORDER
604	compare = compares[order_index];
605#else
606	if (displaymode == DISP_CPU)
607		compare = proc_compare;
608	else
609		compare = io_compare;
610#endif
611
612	/* get the current set of processes */
613	processes =
614		get_process_info(&system_info, &ps, compare);
615
616	/* display the load averages */
617	(*d_loadave)(system_info.last_pid,
618		     system_info.load_avg);
619
620	/* display the current time */
621	/* this method of getting the time SHOULD be fairly portable */
622	time(&curr_time);
623	i_uptime(&system_info.boottime, &curr_time);
624	i_timeofday(&curr_time);
625
626	/* display process state breakdown */
627	(*d_procstates)(system_info.p_total,
628			system_info.procstates);
629
630	/* display the cpu state percentage breakdown */
631	if (dostates)	/* but not the first time */
632	{
633	    (*d_cpustates)(system_info.cpustates);
634	}
635	else
636	{
637	    /* we'll do it next time */
638	    if (smart_terminal)
639	    {
640		z_cpustates();
641	    }
642	    else
643	    {
644		putchar('\n');
645	    }
646	    dostates = Yes;
647	}
648
649	/* display memory stats */
650	(*d_memory)(system_info.memory);
651
652	/* display swap stats */
653	(*d_swap)(system_info.swap);
654
655	/* handle message area */
656	(*d_message)();
657
658	/* update the header area */
659	(*d_header)(header_text);
660
661	if (topn > 0)
662	{
663	    /* determine number of processes to actually display */
664	    /* this number will be the smallest of:  active processes,
665	       number user requested, number current screen accomodates */
666	    active_procs = system_info.P_ACTIVE;
667	    if (active_procs > topn)
668	    {
669		active_procs = topn;
670	    }
671	    if (active_procs > max_topn)
672	    {
673		active_procs = max_topn;
674	    }
675
676	    /* now show the top "n" processes. */
677	    for (i = 0; i < active_procs; i++)
678	    {
679		(*d_process)(i, format_next_process(processes, get_userid,
680			     fmt_flags));
681	    }
682	}
683	else
684	{
685	    i = 0;
686	}
687
688	/* do end-screen processing */
689	u_endscreen(i);
690
691	/* now, flush the output buffer */
692	if (fflush(stdout) != 0)
693	{
694	    new_message(MT_standout, " Write error on stdout");
695	    putchar('\r');
696	    quit(1);
697	    /*NOTREACHED*/
698	}
699
700	/* only do the rest if we have more displays to show */
701	if (displays)
702	{
703	    /* switch out for new display on smart terminals */
704	    if (smart_terminal)
705	    {
706		if (overstrike)
707		{
708		    reset_display();
709		}
710		else
711		{
712		    d_loadave = u_loadave;
713		    d_procstates = u_procstates;
714		    d_cpustates = u_cpustates;
715		    d_memory = u_memory;
716		    d_swap = u_swap;
717		    d_message = u_message;
718		    d_header = u_header;
719		    d_process = u_process;
720		}
721	    }
722
723	    no_command = Yes;
724	    if (!interactive)
725	    {
726		/* set up alarm */
727		(void) signal(SIGALRM, onalrm);
728		(void) alarm((unsigned)delay);
729
730		/* wait for the rest of it .... */
731		pause();
732	    }
733	    else while (no_command)
734	    {
735		/* assume valid command unless told otherwise */
736		no_command = No;
737
738		/* set up arguments for select with timeout */
739		FD_ZERO(&readfds);
740		FD_SET(0, &readfds);		/* for standard input */
741		timeout.tv_sec  = delay;
742		timeout.tv_usec = 0;
743
744		if (leaveflag) {
745		    end_screen();
746		    exit(0);
747		}
748
749		if (tstopflag) {
750		    /* move to the lower left */
751		    end_screen();
752		    fflush(stdout);
753
754		    /* default the signal handler action */
755		    (void) signal(SIGTSTP, SIG_DFL);
756
757		    /* unblock the signal and send ourselves one */
758#ifdef SIGRELSE
759		    sigrelse(SIGTSTP);
760#else
761		    (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
762#endif
763		    (void) kill(0, SIGTSTP);
764
765		    /* reset the signal handler */
766		    (void) signal(SIGTSTP, tstop);
767
768		    /* reinit screen */
769		    reinit_screen();
770		    reset_display();
771		    tstopflag = 0;
772		    goto restart;
773		}
774
775		if (winchflag) {
776		    /* reascertain the screen dimensions */
777		    get_screensize();
778
779		    /* tell display to resize */
780		    max_topn = display_resize();
781
782		    /* reset the signal handler */
783		    (void) signal(SIGWINCH, winch);
784
785		    reset_display();
786		    winchflag = 0;
787		    goto restart;
788		}
789
790		/* wait for either input or the end of the delay period */
791		sel_ret = select(2, &readfds, NULL, NULL, &timeout);
792		if (sel_ret < 0 && errno != EINTR)
793		    quit(0);
794		if (sel_ret > 0)
795		{
796		    int newval;
797		    char *errmsg;
798
799		    /* something to read -- clear the message area first */
800		    clear_message();
801
802		    /* now read it and convert to command strchr */
803		    /* (use "change" as a temporary to hold strchr) */
804		    if (read(0, &ch, 1) != 1)
805		    {
806			/* read error: either 0 or -1 */
807			new_message(MT_standout, " Read error on stdin");
808			putchar('\r');
809			quit(1);
810			/*NOTREACHED*/
811		    }
812		    if ((iptr = strchr(command_chars, ch)) == NULL)
813		    {
814			if (ch != '\r' && ch != '\n')
815			{
816			    /* illegal command */
817			    new_message(MT_standout, " Command not understood");
818			}
819			putchar('\r');
820			no_command = Yes;
821		    }
822		    else
823		    {
824			change = iptr - command_chars;
825			if (overstrike && change > CMD_OSLIMIT)
826			{
827			    /* error */
828			    new_message(MT_standout,
829			    " Command cannot be handled by this terminal");
830			    putchar('\r');
831			    no_command = Yes;
832			}
833			else switch(change)
834			{
835			    case CMD_redraw:	/* redraw screen */
836				reset_display();
837				break;
838
839			    case CMD_update:	/* merely update display */
840				/* is the load average high? */
841				if (system_info.load_avg[0] > LoadMax)
842				{
843				    /* yes, go home for visual feedback */
844				    go_home();
845				    fflush(stdout);
846				}
847				break;
848
849			    case CMD_quit:	/* quit */
850				quit(0);
851				/*NOTREACHED*/
852				break;
853
854			    case CMD_help1:	/* help */
855			    case CMD_help2:
856				reset_display();
857				clear();
858				show_help();
859				standout("Hit any key to continue: ");
860				fflush(stdout);
861				(void) read(0, &ch, 1);
862				break;
863
864			    case CMD_errors:	/* show errors */
865				if (error_count() == 0)
866				{
867				    new_message(MT_standout,
868					" Currently no errors to report.");
869				    putchar('\r');
870				    no_command = Yes;
871				}
872				else
873				{
874				    reset_display();
875				    clear();
876				    show_errors();
877				    standout("Hit any key to continue: ");
878				    fflush(stdout);
879				    (void) read(0, &ch, 1);
880				}
881				break;
882
883			    case CMD_number1:	/* new number */
884			    case CMD_number2:
885				new_message(MT_standout,
886				    "Number of processes to show: ");
887				newval = readline(tempbuf1, 8, Yes);
888				if (newval > -1)
889				{
890				    if (newval > max_topn)
891				    {
892					new_message(MT_standout | MT_delayed,
893					  " This terminal can only display %d processes.",
894					  max_topn);
895					putchar('\r');
896				    }
897
898				    if (newval == 0)
899				    {
900					/* inhibit the header */
901					display_header(No);
902				    }
903				    else if (newval > topn && topn == 0)
904				    {
905					/* redraw the header */
906					display_header(Yes);
907					d_header = i_header;
908				    }
909				    topn = newval;
910				}
911				break;
912
913			    case CMD_delay:	/* new seconds delay */
914				new_message(MT_standout, "Seconds to delay: ");
915				if ((i = readline(tempbuf1, 8, Yes)) > -1)
916				{
917				    if ((delay = i) == 0 && getuid() != 0)
918				    {
919					delay = 1;
920				    }
921				}
922				clear_message();
923				break;
924
925			    case CMD_displays:	/* change display count */
926				new_message(MT_standout,
927					"Displays to show (currently %s): ",
928					displays == -1 ? "infinite" :
929							 itoa(displays));
930				if ((i = readline(tempbuf1, 10, Yes)) > 0)
931				{
932				    displays = i;
933				}
934				else if (i == 0)
935				{
936				    quit(0);
937				}
938				clear_message();
939				break;
940
941			    case CMD_kill:	/* kill program */
942				new_message(0, "kill ");
943				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
944				{
945				    if ((errmsg = kill_procs(tempbuf2)) != NULL)
946				    {
947					new_message(MT_standout, "%s", errmsg);
948					putchar('\r');
949					no_command = Yes;
950				    }
951				}
952				else
953				{
954				    clear_message();
955				}
956				break;
957
958			    case CMD_renice:	/* renice program */
959				new_message(0, "renice ");
960				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
961				{
962				    if ((errmsg = renice_procs(tempbuf2)) != NULL)
963				    {
964					new_message(MT_standout, "%s", errmsg);
965					putchar('\r');
966					no_command = Yes;
967				    }
968				}
969				else
970				{
971				    clear_message();
972				}
973				break;
974
975			    case CMD_idletog:
976			    case CMD_idletog2:
977				ps.idle = !ps.idle;
978				new_message(MT_standout | MT_delayed,
979				    " %sisplaying idle processes.",
980				    ps.idle ? "D" : "Not d");
981				putchar('\r');
982				break;
983
984			    case CMD_selftog:
985				ps.self = (ps.self == -1) ? getpid() : -1;
986				new_message(MT_standout | MT_delayed,
987				    " %sisplaying self.",
988				    (ps.self == -1) ? "D" : "Not d");
989				putchar('\r');
990				break;
991
992			    case CMD_user:
993				new_message(MT_standout,
994				    "Username to show: ");
995				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
996				{
997				    if (tempbuf2[0] == '+' &&
998					tempbuf2[1] == '\0')
999				    {
1000					ps.uid = -1;
1001				    }
1002				    else if ((i = userid(tempbuf2)) == -1)
1003				    {
1004					new_message(MT_standout,
1005					    " %s: unknown user", tempbuf2);
1006					no_command = Yes;
1007				    }
1008				    else
1009				    {
1010					ps.uid = i;
1011				    }
1012				    putchar('\r');
1013				}
1014				else
1015				{
1016				    clear_message();
1017				}
1018				break;
1019
1020			    case CMD_thrtog:
1021				ps.thread = !ps.thread;
1022				new_message(MT_standout | MT_delayed,
1023				    " Displaying threads %s",
1024				    ps.thread ? "separately" : "as a count");
1025				header_text = format_header(uname_field);
1026				reset_display();
1027				putchar('\r');
1028				break;
1029			    case CMD_wcputog:
1030				ps.wcpu = !ps.wcpu;
1031				new_message(MT_standout | MT_delayed,
1032				    " Displaying %s CPU",
1033				    ps.wcpu ? "weighted" : "raw");
1034				header_text = format_header(uname_field);
1035				reset_display();
1036				putchar('\r');
1037				break;
1038			    case CMD_viewtog:
1039				if (++displaymode == DISP_MAX)
1040					displaymode = 0;
1041				header_text = format_header(uname_field);
1042				display_header(Yes);
1043				d_header = i_header;
1044				reset_display();
1045				break;
1046			    case CMD_viewsys:
1047				ps.system = !ps.system;
1048				break;
1049			    case CMD_showargs:
1050				fmt_flags ^= FMT_SHOWARGS;
1051				break;
1052#ifdef ORDER
1053			    case CMD_order:
1054				new_message(MT_standout,
1055				    "Order to sort: ");
1056				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1057				{
1058				  if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1059					{
1060					  new_message(MT_standout,
1061					      " %s: unrecognized sorting order", tempbuf2);
1062					  no_command = Yes;
1063				    }
1064				    else
1065				    {
1066					order_index = i;
1067				    }
1068				    putchar('\r');
1069				}
1070				else
1071				{
1072				    clear_message();
1073				}
1074				break;
1075#endif
1076			    case CMD_jidtog:
1077				ps.jail = !ps.jail;
1078				new_message(MT_standout | MT_delayed,
1079				    " %sisplaying jail ID.",
1080				    ps.jail ? "D" : "Not d");
1081				header_text = format_header(uname_field);
1082				reset_display();
1083				putchar('\r');
1084				break;
1085			    case CMD_kidletog:
1086				ps.kidle = !ps.kidle;
1087				new_message(MT_standout | MT_delayed,
1088				    " %sisplaying system idle process.",
1089				    ps.kidle ? "D" : "Not d");
1090				putchar('\r');
1091				break;
1092			    case CMD_pcputog:
1093				pcpu_stats = !pcpu_stats;
1094				new_message(MT_standout | MT_delayed,
1095				    " Displaying %sCPU statistics.",
1096				    pcpu_stats ? "per-" : "global ");
1097				toggle_pcpustats(&statics);
1098				max_topn = display_updatecpus(&statics);
1099				reset_display();
1100				putchar('\r');
1101				break;
1102			    default:
1103				new_message(MT_standout, " BAD CASE IN SWITCH!");
1104				putchar('\r');
1105			}
1106		    }
1107
1108		    /* flush out stuff that may have been written */
1109		    fflush(stdout);
1110		}
1111	    }
1112	}
1113    }
1114
1115#ifdef DEBUG
1116    fclose(debug);
1117#endif
1118    quit(0);
1119    /*NOTREACHED*/
1120}
1121
1122/*
1123 *  reset_display() - reset all the display routine pointers so that entire
1124 *	screen will get redrawn.
1125 */
1126
1127reset_display()
1128
1129{
1130    d_loadave    = i_loadave;
1131    d_procstates = i_procstates;
1132    d_cpustates  = i_cpustates;
1133    d_memory     = i_memory;
1134    d_swap       = i_swap;
1135    d_message	 = i_message;
1136    d_header	 = i_header;
1137    d_process	 = i_process;
1138}
1139
1140/*
1141 *  signal handlers
1142 */
1143
1144sigret_t leave()	/* exit under normal conditions -- INT handler */
1145
1146{
1147    leaveflag = 1;
1148}
1149
1150sigret_t tstop(i)	/* SIGTSTP handler */
1151
1152int i;
1153
1154{
1155    tstopflag = 1;
1156}
1157
1158#ifdef SIGWINCH
1159sigret_t winch(i)		/* SIGWINCH handler */
1160
1161int i;
1162
1163{
1164    winchflag = 1;
1165}
1166#endif
1167
1168void quit(status)		/* exit under duress */
1169
1170int status;
1171
1172{
1173    end_screen();
1174    exit(status);
1175    /*NOTREACHED*/
1176}
1177
1178sigret_t onalrm()	/* SIGALRM handler */
1179
1180{
1181    /* this is only used in batch mode to break out of the pause() */
1182    /* return; */
1183}
1184
1185