top.c revision 145073 
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 145073 2005-04-14 15:02:03Z keramida $
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
68/* signal handling routines */
69sigret_t leave();
70sigret_t onalrm();
71sigret_t tstop();
72#ifdef SIGWINCH
73sigret_t winch();
74#endif
75
76volatile sig_atomic_t leaveflag;
77volatile sig_atomic_t tstopflag;
78volatile sig_atomic_t winchflag;
79
80/* internal routines */
81void quit();
82
83/* values which need to be accessed by signal handlers */
84static int max_topn;		/* maximum displayable processes */
85
86/* miscellaneous things */
87struct process_select ps;
88char *myname = "top";
89jmp_buf jmp_int;
90
91/* routines that don't return int */
92
93char *username();
94char *ctime();
95char *kill_procs();
96char *renice_procs();
97
98#ifdef ORDER
99extern int (*compares[])();
100#else
101extern int proc_compare();
102extern int io_compare();
103#endif
104time_t time();
105
106caddr_t get_process_info();
107
108/* different routines for displaying the user's identification */
109/* (values assigned to get_userid) */
110char *username();
111char *itoa7();
112
113/* display routines that need to be predeclared */
114int i_loadave();
115int u_loadave();
116int i_procstates();
117int u_procstates();
118int i_cpustates();
119int u_cpustates();
120int i_memory();
121int u_memory();
122int i_swap();
123int u_swap();
124int i_message();
125int u_message();
126int i_header();
127int u_header();
128int i_process();
129int u_process();
130
131/* pointers to display routines */
132int (*d_loadave)() = i_loadave;
133int (*d_procstates)() = i_procstates;
134int (*d_cpustates)() = i_cpustates;
135int (*d_memory)() = i_memory;
136int (*d_swap)() = i_swap;
137int (*d_message)() = i_message;
138int (*d_header)() = i_header;
139int (*d_process)() = i_process;
140
141
142main(argc, argv)
143
144int  argc;
145char *argv[];
146
147{
148    register int i;
149    register int active_procs;
150    register int change;
151
152    struct system_info system_info;
153    struct statics statics;
154    caddr_t processes;
155
156    static char tempbuf1[50];
157    static char tempbuf2[50];
158    int old_sigmask;		/* only used for BSD-style signals */
159    int topn = Default_TOPN;
160    int delay = Default_DELAY;
161    int displays = 0;		/* indicates unspecified */
162    int sel_ret = 0;
163    time_t curr_time;
164    char *(*get_userid)() = username;
165    char *uname_field = "USERNAME";
166    char *header_text;
167    char *env_top;
168    char **preset_argv;
169    int  preset_argc = 0;
170    char **av;
171    int  ac;
172    char dostates = No;
173    char do_unames = Yes;
174    char interactive = Maybe;
175    char warnings = 0;
176#if Default_TOPN == Infinity
177    char topn_specified = No;
178#endif
179    char ch;
180    char *iptr;
181    char no_command = 1;
182    struct timeval timeout;
183#ifdef ORDER
184    char *order_name = NULL;
185    int order_index = 0;
186#endif
187#ifndef FD_SET
188    /* FD_SET and friends are not present:  fake it */
189    typedef int fd_set;
190#define FD_ZERO(x)     (*(x) = 0)
191#define FD_SET(f, x)   (*(x) = 1<<f)
192#endif
193    fd_set readfds;
194
195#ifdef ORDER
196    static char command_chars[] = "\f qh?en#sdkriIutHmSo";
197#else
198    static char command_chars[] = "\f qh?en#sdkriIutHmS";
199#endif
200/* these defines enumerate the "strchr"s of the commands in command_chars */
201#define CMD_redraw	0
202#define CMD_update	1
203#define CMD_quit	2
204#define CMD_help1	3
205#define CMD_help2	4
206#define CMD_OSLIMIT	4    /* terminals with OS can only handle commands */
207#define CMD_errors	5    /* less than or equal to CMD_OSLIMIT	   */
208#define CMD_number1	6
209#define CMD_number2	7
210#define CMD_delay	8
211#define CMD_displays	9
212#define CMD_kill	10
213#define CMD_renice	11
214#define CMD_idletog     12
215#define CMD_idletog2    13
216#define CMD_user	14
217#define CMD_selftog	15
218#define CMD_thrtog	16
219#define CMD_viewtog	17
220#define CMD_viewsys	18
221#ifdef ORDER
222#define CMD_order       19
223#endif
224
225    /* set the buffer for stdout */
226#ifdef DEBUG
227    extern FILE *debug;
228    debug = fopen("debug.run", "w");
229    setbuffer(stdout, NULL, 0);
230#else
231    setbuffer(stdout, stdoutbuf, Buffersize);
232#endif
233
234    /* get our name */
235    if (argc > 0)
236    {
237	if ((myname = strrchr(argv[0], '/')) == 0)
238	{
239	    myname = argv[0];
240	}
241	else
242	{
243	    myname++;
244	}
245    }
246
247    /* initialize some selection options */
248    ps.idle    = Yes;
249    ps.self    = -1;
250    ps.system  = No;
251    ps.uid     = -1;
252    ps.thread  = No;
253    ps.command = NULL;
254
255    /* get preset options from the environment */
256    if ((env_top = getenv("TOP")) != NULL)
257    {
258	av = preset_argv = argparse(env_top, &preset_argc);
259	ac = preset_argc;
260
261	/* set the dummy argument to an explanatory message, in case
262	   getopt encounters a bad argument */
263	preset_argv[0] = "while processing environment";
264    }
265
266    /* process options */
267    do {
268	/* if we're done doing the presets, then process the real arguments */
269	if (preset_argc == 0)
270	{
271	    ac = argc;
272	    av = argv;
273
274	    /* this should keep getopt happy... */
275	    optind = 1;
276	}
277
278	while ((i = getopt(ac, av, "SIHbinquvs:d:U:m:o:t")) != EOF)
279	{
280	    switch(i)
281	    {
282	      case 'v':			/* show version number */
283		fprintf(stderr, "%s: version %s\n",
284			myname, version_string());
285		exit(1);
286		break;
287
288	      case 'u':			/* toggle uid/username display */
289		do_unames = !do_unames;
290		break;
291
292	      case 'U':			/* display only username's processes */
293		if ((ps.uid = userid(optarg)) == -1)
294		{
295		    fprintf(stderr, "%s: unknown user\n", optarg);
296		    exit(1);
297		}
298		break;
299
300	      case 'S':			/* show system processes */
301		ps.system = !ps.system;
302		break;
303
304	      case 'I':                   /* show idle processes */
305		ps.idle = !ps.idle;
306		break;
307
308	      case 'i':			/* go interactive regardless */
309		interactive = Yes;
310		break;
311
312	      case 'n':			/* batch, or non-interactive */
313	      case 'b':
314		interactive = No;
315		break;
316
317	      case 'd':			/* number of displays to show */
318		if ((i = atoiwi(optarg)) == Invalid || i == 0)
319		{
320		    fprintf(stderr,
321			"%s: warning: display count should be positive -- option ignored\n",
322			myname);
323		    warnings++;
324		}
325		else
326		{
327		    displays = i;
328		}
329		break;
330
331	      case 's':
332		if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
333		{
334		    fprintf(stderr,
335			"%s: warning: seconds delay should be positive -- using default\n",
336			myname);
337		    delay = Default_DELAY;
338		    warnings++;
339		}
340		break;
341
342	      case 'q':		/* be quick about it */
343		/* only allow this if user is really root */
344		if (getuid() == 0)
345		{
346		    /* be very un-nice! */
347		    (void) nice(-20);
348		}
349		else
350		{
351		    fprintf(stderr,
352			"%s: warning: `-q' option can only be used by root\n",
353			myname);
354		    warnings++;
355		}
356		break;
357
358	      case 'm':		/* select display mode */
359		if (strcmp(optarg, "io") == 0) {
360			displaymode = DISP_IO;
361		} else if (strcmp(optarg, "cpu") == 0) {
362			displaymode = DISP_CPU;
363		} else {
364			fprintf(stderr,
365			"%s: warning: `-m' option can only take args "
366			"'io' or 'cpu'\n",
367			myname);
368			exit(1);
369		}
370		break;
371
372	      case 'o':		/* select sort order */
373#ifdef ORDER
374		order_name = optarg;
375#else
376		fprintf(stderr,
377			"%s: this platform does not support arbitrary ordering.  Sorry.\n",
378			myname);
379		warnings++;
380#endif
381		break;
382
383	      case 't':
384		ps.self = (ps.self == -1) ? getpid() : -1;
385		break;
386
387	      case 'H':
388		ps.thread = !ps.thread;
389		break;
390
391	      default:
392		fprintf(stderr, "\
393Top version %s\n\
394Usage: %s [-HISbinqut] [-d x] [-s x] [-o field] [-U username] [number]\n",
395			version_string(), myname);
396		exit(1);
397	    }
398	}
399
400	/* get count of top processes to display (if any) */
401	if (optind < ac)
402	{
403	    if ((topn = atoiwi(av[optind])) == Invalid)
404	    {
405		fprintf(stderr,
406			"%s: warning: process display count should be non-negative -- using default\n",
407			myname);
408		warnings++;
409	    }
410#if Default_TOPN == Infinity
411            else
412	    {
413		topn_specified = Yes;
414	    }
415#endif
416	}
417
418	/* tricky:  remember old value of preset_argc & set preset_argc = 0 */
419	i = preset_argc;
420	preset_argc = 0;
421
422    /* repeat only if we really did the preset arguments */
423    } while (i != 0);
424
425    /* set constants for username/uid display correctly */
426    if (!do_unames)
427    {
428	uname_field = "   UID  ";
429	get_userid = itoa7;
430    }
431
432    /* initialize the kernel memory interface */
433    if (machine_init(&statics) == -1)
434    {
435	exit(1);
436    }
437
438#ifdef ORDER
439    /* determine sorting order index, if necessary */
440    if (order_name != NULL)
441    {
442	if ((order_index = string_index(order_name, statics.order_names)) == -1)
443	{
444	    char **pp;
445
446	    fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
447		    myname, order_name);
448	    fprintf(stderr, "\tTry one of these:");
449	    pp = statics.order_names;
450	    while (*pp != NULL)
451	    {
452		fprintf(stderr, " %s", *pp++);
453	    }
454	    fputc('\n', stderr);
455	    exit(1);
456	}
457    }
458#endif
459
460#ifdef no_initialization_needed
461    /* initialize the hashing stuff */
462    if (do_unames)
463    {
464	init_hash();
465    }
466#endif
467
468    /* initialize termcap */
469    init_termcap(interactive);
470
471    /* get the string to use for the process area header */
472    header_text = format_header(uname_field);
473
474    /* initialize display interface */
475    if ((max_topn = display_init(&statics)) == -1)
476    {
477	fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
478	exit(4);
479    }
480
481    /* print warning if user requested more processes than we can display */
482    if (topn > max_topn)
483    {
484	fprintf(stderr,
485		"%s: warning: this terminal can only display %d processes.\n",
486		myname, max_topn);
487	warnings++;
488    }
489
490    /* adjust for topn == Infinity */
491    if (topn == Infinity)
492    {
493	/*
494	 *  For smart terminals, infinity really means everything that can
495	 *  be displayed, or Largest.
496	 *  On dumb terminals, infinity means every process in the system!
497	 *  We only really want to do that if it was explicitly specified.
498	 *  This is always the case when "Default_TOPN != Infinity".  But if
499	 *  topn wasn't explicitly specified and we are on a dumb terminal
500	 *  and the default is Infinity, then (and only then) we use
501	 *  "Nominal_TOPN" instead.
502	 */
503#if Default_TOPN == Infinity
504	topn = smart_terminal ? Largest :
505		    (topn_specified ? Largest : Nominal_TOPN);
506#else
507	topn = Largest;
508#endif
509    }
510
511    /* set header display accordingly */
512    display_header(topn > 0);
513
514    /* determine interactive state */
515    if (interactive == Maybe)
516    {
517	interactive = smart_terminal;
518    }
519
520    /* if # of displays not specified, fill it in */
521    if (displays == 0)
522    {
523	displays = smart_terminal ? Infinity : 1;
524    }
525
526    /* hold interrupt signals while setting up the screen and the handlers */
527#ifdef SIGHOLD
528    sighold(SIGINT);
529    sighold(SIGQUIT);
530    sighold(SIGTSTP);
531#else
532    old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
533#endif
534    init_screen();
535    (void) signal(SIGINT, leave);
536    (void) signal(SIGQUIT, leave);
537    (void) signal(SIGTSTP, tstop);
538#ifdef SIGWINCH
539    (void) signal(SIGWINCH, winch);
540#endif
541#ifdef SIGRELSE
542    sigrelse(SIGINT);
543    sigrelse(SIGQUIT);
544    sigrelse(SIGTSTP);
545#else
546    (void) sigsetmask(old_sigmask);
547#endif
548    if (warnings)
549    {
550	fputs("....", stderr);
551	fflush(stderr);			/* why must I do this? */
552	sleep((unsigned)(3 * warnings));
553	fputc('\n', stderr);
554    }
555
556restart:
557
558    /*
559     *  main loop -- repeat while display count is positive or while it
560     *		indicates infinity (by being -1)
561     */
562
563    while ((displays == -1) || (displays-- > 0))
564    {
565	int (*compare)();
566
567
568	/* get the current stats */
569	get_system_info(&system_info);
570
571#ifdef ORDER
572	compare = compares[order_index];
573#else
574	if (displaymode == DISP_CPU)
575		compare = proc_compare;
576	else
577		compare = io_compare;
578#endif
579
580	/* get the current set of processes */
581	processes =
582		get_process_info(&system_info, &ps, compare);
583
584	/* display the load averages */
585	(*d_loadave)(system_info.last_pid,
586		     system_info.load_avg);
587
588	/* display the current time */
589	/* this method of getting the time SHOULD be fairly portable */
590	time(&curr_time);
591	i_uptime(&system_info.boottime, &curr_time);
592	i_timeofday(&curr_time);
593
594	/* display process state breakdown */
595	(*d_procstates)(system_info.p_total,
596			system_info.procstates);
597
598	/* display the cpu state percentage breakdown */
599	if (dostates)	/* but not the first time */
600	{
601	    (*d_cpustates)(system_info.cpustates);
602	}
603	else
604	{
605	    /* we'll do it next time */
606	    if (smart_terminal)
607	    {
608		z_cpustates();
609	    }
610	    else
611	    {
612		putchar('\n');
613	    }
614	    dostates = Yes;
615	}
616
617	/* display memory stats */
618	(*d_memory)(system_info.memory);
619
620	/* display swap stats */
621	(*d_swap)(system_info.swap);
622
623	/* handle message area */
624	(*d_message)();
625
626	/* update the header area */
627	(*d_header)(header_text);
628
629	if (topn > 0)
630	{
631	    /* determine number of processes to actually display */
632	    /* this number will be the smallest of:  active processes,
633	       number user requested, number current screen accomodates */
634	    active_procs = system_info.P_ACTIVE;
635	    if (active_procs > topn)
636	    {
637		active_procs = topn;
638	    }
639	    if (active_procs > max_topn)
640	    {
641		active_procs = max_topn;
642	    }
643
644	    /* now show the top "n" processes. */
645	    for (i = 0; i < active_procs; i++)
646	    {
647		(*d_process)(i, format_next_process(processes, get_userid));
648	    }
649	}
650	else
651	{
652	    i = 0;
653	}
654
655	/* do end-screen processing */
656	u_endscreen(i);
657
658	/* now, flush the output buffer */
659	if (fflush(stdout) != 0)
660	{
661	    new_message(MT_standout, " Write error on stdout");
662	    putchar('\r');
663	    quit(1);
664	    /*NOTREACHED*/
665	}
666
667	/* only do the rest if we have more displays to show */
668	if (displays)
669	{
670	    /* switch out for new display on smart terminals */
671	    if (smart_terminal)
672	    {
673		if (overstrike)
674		{
675		    reset_display();
676		}
677		else
678		{
679		    d_loadave = u_loadave;
680		    d_procstates = u_procstates;
681		    d_cpustates = u_cpustates;
682		    d_memory = u_memory;
683		    d_swap = u_swap;
684		    d_message = u_message;
685		    d_header = u_header;
686		    d_process = u_process;
687		}
688	    }
689
690	    no_command = Yes;
691	    if (!interactive)
692	    {
693		/* set up alarm */
694		(void) signal(SIGALRM, onalrm);
695		(void) alarm((unsigned)delay);
696
697		/* wait for the rest of it .... */
698		pause();
699	    }
700	    else while (no_command)
701	    {
702		/* assume valid command unless told otherwise */
703		no_command = No;
704
705		/* set up arguments for select with timeout */
706		FD_ZERO(&readfds);
707		FD_SET(0, &readfds);		/* for standard input */
708		timeout.tv_sec  = delay;
709		timeout.tv_usec = 0;
710
711		if (leaveflag) {
712		    end_screen();
713		    exit(0);
714		}
715
716		if (tstopflag) {
717		    /* move to the lower left */
718		    end_screen();
719		    fflush(stdout);
720
721		    /* default the signal handler action */
722		    (void) signal(SIGTSTP, SIG_DFL);
723
724		    /* unblock the signal and send ourselves one */
725#ifdef SIGRELSE
726		    sigrelse(SIGTSTP);
727#else
728		    (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
729#endif
730		    (void) kill(0, SIGTSTP);
731
732		    /* reset the signal handler */
733		    (void) signal(SIGTSTP, tstop);
734
735		    /* reinit screen */
736		    reinit_screen();
737		    reset_display();
738		    tstopflag = 0;
739		    goto restart;
740		}
741
742		if (winchflag) {
743		    /* reascertain the screen dimensions */
744		    get_screensize();
745
746		    /* tell display to resize */
747		    max_topn = display_resize();
748
749		    /* reset the signal handler */
750		    (void) signal(SIGWINCH, winch);
751
752		    reset_display();
753		    winchflag = 0;
754		    goto restart;
755		}
756
757		/* wait for either input or the end of the delay period */
758		sel_ret = select(2, &readfds, NULL, NULL, &timeout);
759		if (sel_ret < 0 && errno != EINTR)
760		    quit(0);
761		if (sel_ret > 0)
762		{
763		    int newval;
764		    char *errmsg;
765
766		    /* something to read -- clear the message area first */
767		    clear_message();
768
769		    /* now read it and convert to command strchr */
770		    /* (use "change" as a temporary to hold strchr) */
771		    if (read(0, &ch, 1) != 1)
772		    {
773			/* read error: either 0 or -1 */
774			new_message(MT_standout, " Read error on stdin");
775			putchar('\r');
776			quit(1);
777			/*NOTREACHED*/
778		    }
779		    if ((iptr = strchr(command_chars, ch)) == NULL)
780		    {
781			if (ch != '\r' && ch != '\n')
782			{
783			    /* illegal command */
784			    new_message(MT_standout, " Command not understood");
785			}
786			putchar('\r');
787			no_command = Yes;
788		    }
789		    else
790		    {
791			change = iptr - command_chars;
792			if (overstrike && change > CMD_OSLIMIT)
793			{
794			    /* error */
795			    new_message(MT_standout,
796			    " Command cannot be handled by this terminal");
797			    putchar('\r');
798			    no_command = Yes;
799			}
800			else switch(change)
801			{
802			    case CMD_redraw:	/* redraw screen */
803				reset_display();
804				break;
805
806			    case CMD_update:	/* merely update display */
807				/* is the load average high? */
808				if (system_info.load_avg[0] > LoadMax)
809				{
810				    /* yes, go home for visual feedback */
811				    go_home();
812				    fflush(stdout);
813				}
814				break;
815
816			    case CMD_quit:	/* quit */
817				quit(0);
818				/*NOTREACHED*/
819				break;
820
821			    case CMD_help1:	/* help */
822			    case CMD_help2:
823				reset_display();
824				clear();
825				show_help();
826				standout("Hit any key to continue: ");
827				fflush(stdout);
828				(void) read(0, &ch, 1);
829				break;
830
831			    case CMD_errors:	/* show errors */
832				if (error_count() == 0)
833				{
834				    new_message(MT_standout,
835					" Currently no errors to report.");
836				    putchar('\r');
837				    no_command = Yes;
838				}
839				else
840				{
841				    reset_display();
842				    clear();
843				    show_errors();
844				    standout("Hit any key to continue: ");
845				    fflush(stdout);
846				    (void) read(0, &ch, 1);
847				}
848				break;
849
850			    case CMD_number1:	/* new number */
851			    case CMD_number2:
852				new_message(MT_standout,
853				    "Number of processes to show: ");
854				newval = readline(tempbuf1, 8, Yes);
855				if (newval > -1)
856				{
857				    if (newval > max_topn)
858				    {
859					new_message(MT_standout | MT_delayed,
860					  " This terminal can only display %d processes.",
861					  max_topn);
862					putchar('\r');
863				    }
864
865				    if (newval == 0)
866				    {
867					/* inhibit the header */
868					display_header(No);
869				    }
870				    else if (newval > topn && topn == 0)
871				    {
872					/* redraw the header */
873					display_header(Yes);
874					d_header = i_header;
875				    }
876				    topn = newval;
877				}
878				break;
879
880			    case CMD_delay:	/* new seconds delay */
881				new_message(MT_standout, "Seconds to delay: ");
882				if ((i = readline(tempbuf1, 8, Yes)) > -1)
883				{
884				    if ((delay = i) == 0 && getuid() != 0)
885				    {
886					delay = 1;
887				    }
888				}
889				clear_message();
890				break;
891
892			    case CMD_displays:	/* change display count */
893				new_message(MT_standout,
894					"Displays to show (currently %s): ",
895					displays == -1 ? "infinite" :
896							 itoa(displays));
897				if ((i = readline(tempbuf1, 10, Yes)) > 0)
898				{
899				    displays = i;
900				}
901				else if (i == 0)
902				{
903				    quit(0);
904				}
905				clear_message();
906				break;
907
908			    case CMD_kill:	/* kill program */
909				new_message(0, "kill ");
910				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
911				{
912				    if ((errmsg = kill_procs(tempbuf2)) != NULL)
913				    {
914					new_message(MT_standout, "%s", errmsg);
915					putchar('\r');
916					no_command = Yes;
917				    }
918				}
919				else
920				{
921				    clear_message();
922				}
923				break;
924
925			    case CMD_renice:	/* renice program */
926				new_message(0, "renice ");
927				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
928				{
929				    if ((errmsg = renice_procs(tempbuf2)) != NULL)
930				    {
931					new_message(MT_standout, "%s", errmsg);
932					putchar('\r');
933					no_command = Yes;
934				    }
935				}
936				else
937				{
938				    clear_message();
939				}
940				break;
941
942			    case CMD_idletog:
943			    case CMD_idletog2:
944				ps.idle = !ps.idle;
945				new_message(MT_standout | MT_delayed,
946				    " %sisplaying idle processes.",
947				    ps.idle ? "D" : "Not d");
948				putchar('\r');
949				break;
950
951			    case CMD_selftog:
952				ps.self = (ps.self == -1) ? getpid() : -1;
953				new_message(MT_standout | MT_delayed,
954				    " %sisplaying self.",
955				    (ps.self == -1) ? "D" : "Not d");
956				putchar('\r');
957				break;
958
959			    case CMD_user:
960				new_message(MT_standout,
961				    "Username to show: ");
962				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
963				{
964				    if (tempbuf2[0] == '+' &&
965					tempbuf2[1] == '\0')
966				    {
967					ps.uid = -1;
968				    }
969				    else if ((i = userid(tempbuf2)) == -1)
970				    {
971					new_message(MT_standout,
972					    " %s: unknown user", tempbuf2);
973					no_command = Yes;
974				    }
975				    else
976				    {
977					ps.uid = i;
978				    }
979				    putchar('\r');
980				}
981				else
982				{
983				    clear_message();
984				}
985				break;
986
987			    case CMD_thrtog:
988				ps.thread = !ps.thread;
989				new_message(MT_standout | MT_delayed,
990				    "Displaying threads %s",
991				    ps.thread ? "separately" : "as a count");
992				header_text = format_header(uname_field);
993				reset_display();
994				putchar('\r');
995				break;
996			    case CMD_viewtog:
997				if (++displaymode == DISP_MAX)
998					displaymode = 0;
999				header_text = format_header(uname_field);
1000				display_header(Yes);
1001				d_header = i_header;
1002				reset_display();
1003				break;
1004			    case CMD_viewsys:
1005				ps.system = !ps.system;
1006				break;
1007#ifdef ORDER
1008			    case CMD_order:
1009				new_message(MT_standout,
1010				    "Order to sort: ");
1011				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1012				{
1013				  if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1014					{
1015					  new_message(MT_standout,
1016					      " %s: unrecognized sorting order", tempbuf2);
1017					  no_command = Yes;
1018				    }
1019				    else
1020				    {
1021					order_index = i;
1022				    }
1023				    putchar('\r');
1024				}
1025				else
1026				{
1027				    clear_message();
1028				}
1029				break;
1030#endif
1031
1032			    default:
1033				new_message(MT_standout, " BAD CASE IN SWITCH!");
1034				putchar('\r');
1035			}
1036		    }
1037
1038		    /* flush out stuff that may have been written */
1039		    fflush(stdout);
1040		}
1041	    }
1042	}
1043    }
1044
1045#ifdef DEBUG
1046    fclose(debug);
1047#endif
1048    quit(0);
1049    /*NOTREACHED*/
1050}
1051
1052/*
1053 *  reset_display() - reset all the display routine pointers so that entire
1054 *	screen will get redrawn.
1055 */
1056
1057reset_display()
1058
1059{
1060    d_loadave    = i_loadave;
1061    d_procstates = i_procstates;
1062    d_cpustates  = i_cpustates;
1063    d_memory     = i_memory;
1064    d_swap       = i_swap;
1065    d_message	 = i_message;
1066    d_header	 = i_header;
1067    d_process	 = i_process;
1068}
1069
1070/*
1071 *  signal handlers
1072 */
1073
1074sigret_t leave()	/* exit under normal conditions -- INT handler */
1075
1076{
1077    leaveflag = 1;
1078}
1079
1080sigret_t tstop(i)	/* SIGTSTP handler */
1081
1082int i;
1083
1084{
1085    tstopflag = 1;
1086}
1087
1088#ifdef SIGWINCH
1089sigret_t winch(i)		/* SIGWINCH handler */
1090
1091int i;
1092
1093{
1094    winchflag = 1;
1095}
1096#endif
1097
1098void quit(status)		/* exit under duress */
1099
1100int status;
1101
1102{
1103    end_screen();
1104    exit(status);
1105    /*NOTREACHED*/
1106}
1107
1108sigret_t onalrm()	/* SIGALRM handler */
1109
1110{
1111    /* this is only used in batch mode to break out of the pause() */
1112    /* return; */
1113}
1114
1115