top.c revision 168710 
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 168710 2007-04-14 10:16:52Z stas $
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#sdkriIutHmSCao";
199#else
200    static char command_chars[] = "\f qh?en#sdkriIutHmSCa";
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#ifdef ORDER
226#define CMD_order       21
227#endif
228
229    /* set the buffer for stdout */
230#ifdef DEBUG
231    extern FILE *debug;
232    debug = fopen("debug.run", "w");
233    setbuffer(stdout, NULL, 0);
234#else
235    setbuffer(stdout, stdoutbuf, Buffersize);
236#endif
237
238    /* get our name */
239    if (argc > 0)
240    {
241	if ((myname = strrchr(argv[0], '/')) == 0)
242	{
243	    myname = argv[0];
244	}
245	else
246	{
247	    myname++;
248	}
249    }
250
251    /* initialize some selection options */
252    ps.idle    = Yes;
253    ps.self    = -1;
254    ps.system  = No;
255    ps.uid     = -1;
256    ps.thread  = No;
257    ps.wcpu    = 1;
258    ps.command = NULL;
259
260    /* get preset options from the environment */
261    if ((env_top = getenv("TOP")) != NULL)
262    {
263	av = preset_argv = argparse(env_top, &preset_argc);
264	ac = preset_argc;
265
266	/* set the dummy argument to an explanatory message, in case
267	   getopt encounters a bad argument */
268	preset_argv[0] = "while processing environment";
269    }
270
271    /* process options */
272    do {
273	/* if we're done doing the presets, then process the real arguments */
274	if (preset_argc == 0)
275	{
276	    ac = argc;
277	    av = argv;
278
279	    /* this should keep getopt happy... */
280	    optind = 1;
281	}
282
283	while ((i = getopt(ac, av, "CSIHabinquvs:d:U:m:o:t")) != EOF)
284	{
285	    switch(i)
286	    {
287	      case 'v':			/* show version number */
288		fprintf(stderr, "%s: version %s\n",
289			myname, version_string());
290		exit(1);
291		break;
292
293	      case 'u':			/* toggle uid/username display */
294		do_unames = !do_unames;
295		break;
296
297	      case 'U':			/* display only username's processes */
298		if ((ps.uid = userid(optarg)) == -1)
299		{
300		    fprintf(stderr, "%s: unknown user\n", optarg);
301		    exit(1);
302		}
303		break;
304
305	      case 'S':			/* show system processes */
306		ps.system = !ps.system;
307		break;
308
309	      case 'I':                   /* show idle processes */
310		ps.idle = !ps.idle;
311		break;
312
313	      case 'i':			/* go interactive regardless */
314		interactive = Yes;
315		break;
316
317	      case 'n':			/* batch, or non-interactive */
318	      case 'b':
319		interactive = No;
320		break;
321
322	      case 'a':
323		fmt_flags ^= FMT_SHOWARGS;
324		break;
325
326	      case 'd':			/* number of displays to show */
327		if ((i = atoiwi(optarg)) == Invalid || i == 0)
328		{
329		    fprintf(stderr,
330			"%s: warning: display count should be positive -- option ignored\n",
331			myname);
332		    warnings++;
333		}
334		else
335		{
336		    displays = i;
337		}
338		break;
339
340	      case 's':
341		if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
342		{
343		    fprintf(stderr,
344			"%s: warning: seconds delay should be positive -- using default\n",
345			myname);
346		    delay = Default_DELAY;
347		    warnings++;
348		}
349		break;
350
351	      case 'q':		/* be quick about it */
352		/* only allow this if user is really root */
353		if (getuid() == 0)
354		{
355		    /* be very un-nice! */
356		    (void) nice(-20);
357		}
358		else
359		{
360		    fprintf(stderr,
361			"%s: warning: `-q' option can only be used by root\n",
362			myname);
363		    warnings++;
364		}
365		break;
366
367	      case 'm':		/* select display mode */
368		if (strcmp(optarg, "io") == 0) {
369			displaymode = DISP_IO;
370		} else if (strcmp(optarg, "cpu") == 0) {
371			displaymode = DISP_CPU;
372		} else {
373			fprintf(stderr,
374			"%s: warning: `-m' option can only take args "
375			"'io' or 'cpu'\n",
376			myname);
377			exit(1);
378		}
379		break;
380
381	      case 'o':		/* select sort order */
382#ifdef ORDER
383		order_name = optarg;
384#else
385		fprintf(stderr,
386			"%s: this platform does not support arbitrary ordering.  Sorry.\n",
387			myname);
388		warnings++;
389#endif
390		break;
391
392	      case 't':
393		ps.self = (ps.self == -1) ? getpid() : -1;
394		break;
395
396	      case 'C':
397		ps.wcpu = !ps.wcpu;
398		break;
399
400	      case 'H':
401		ps.thread = !ps.thread;
402		break;
403
404	      default:
405		fprintf(stderr,
406"Top version %s\n"
407"Usage: %s [-bCHIinqStuv] [-d count] [-m io | cpu] [-o field] [-s time]\n"
408"       [-U username] [number]\n",
409			version_string(), myname);
410		exit(1);
411	    }
412	}
413
414	/* get count of top processes to display (if any) */
415	if (optind < ac)
416	{
417	    if ((topn = atoiwi(av[optind])) == Invalid)
418	    {
419		fprintf(stderr,
420			"%s: warning: process display count should be non-negative -- using default\n",
421			myname);
422		warnings++;
423	    }
424#if Default_TOPN == Infinity
425            else
426	    {
427		topn_specified = Yes;
428	    }
429#endif
430	}
431
432	/* tricky:  remember old value of preset_argc & set preset_argc = 0 */
433	i = preset_argc;
434	preset_argc = 0;
435
436    /* repeat only if we really did the preset arguments */
437    } while (i != 0);
438
439    /* set constants for username/uid display correctly */
440    if (!do_unames)
441    {
442	uname_field = "   UID  ";
443	get_userid = itoa7;
444    }
445
446    /* initialize the kernel memory interface */
447    if (machine_init(&statics) == -1)
448    {
449	exit(1);
450    }
451
452#ifdef ORDER
453    /* determine sorting order index, if necessary */
454    if (order_name != NULL)
455    {
456	if ((order_index = string_index(order_name, statics.order_names)) == -1)
457	{
458	    char **pp;
459
460	    fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
461		    myname, order_name);
462	    fprintf(stderr, "\tTry one of these:");
463	    pp = statics.order_names;
464	    while (*pp != NULL)
465	    {
466		fprintf(stderr, " %s", *pp++);
467	    }
468	    fputc('\n', stderr);
469	    exit(1);
470	}
471    }
472#endif
473
474#ifdef no_initialization_needed
475    /* initialize the hashing stuff */
476    if (do_unames)
477    {
478	init_hash();
479    }
480#endif
481
482    /* initialize termcap */
483    init_termcap(interactive);
484
485    /* get the string to use for the process area header */
486    header_text = format_header(uname_field);
487
488    /* initialize display interface */
489    if ((max_topn = display_init(&statics)) == -1)
490    {
491	fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
492	exit(4);
493    }
494
495    /* print warning if user requested more processes than we can display */
496    if (topn > max_topn)
497    {
498	fprintf(stderr,
499		"%s: warning: this terminal can only display %d processes.\n",
500		myname, max_topn);
501	warnings++;
502    }
503
504    /* adjust for topn == Infinity */
505    if (topn == Infinity)
506    {
507	/*
508	 *  For smart terminals, infinity really means everything that can
509	 *  be displayed, or Largest.
510	 *  On dumb terminals, infinity means every process in the system!
511	 *  We only really want to do that if it was explicitly specified.
512	 *  This is always the case when "Default_TOPN != Infinity".  But if
513	 *  topn wasn't explicitly specified and we are on a dumb terminal
514	 *  and the default is Infinity, then (and only then) we use
515	 *  "Nominal_TOPN" instead.
516	 */
517#if Default_TOPN == Infinity
518	topn = smart_terminal ? Largest :
519		    (topn_specified ? Largest : Nominal_TOPN);
520#else
521	topn = Largest;
522#endif
523    }
524
525    /* set header display accordingly */
526    display_header(topn > 0);
527
528    /* determine interactive state */
529    if (interactive == Maybe)
530    {
531	interactive = smart_terminal;
532    }
533
534    /* if # of displays not specified, fill it in */
535    if (displays == 0)
536    {
537	displays = smart_terminal ? Infinity : 1;
538    }
539
540    /* hold interrupt signals while setting up the screen and the handlers */
541#ifdef SIGHOLD
542    sighold(SIGINT);
543    sighold(SIGQUIT);
544    sighold(SIGTSTP);
545#else
546    old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
547#endif
548    init_screen();
549    (void) signal(SIGINT, leave);
550    (void) signal(SIGQUIT, leave);
551    (void) signal(SIGTSTP, tstop);
552#ifdef SIGWINCH
553    (void) signal(SIGWINCH, winch);
554#endif
555#ifdef SIGRELSE
556    sigrelse(SIGINT);
557    sigrelse(SIGQUIT);
558    sigrelse(SIGTSTP);
559#else
560    (void) sigsetmask(old_sigmask);
561#endif
562    if (warnings)
563    {
564	fputs("....", stderr);
565	fflush(stderr);			/* why must I do this? */
566	sleep((unsigned)(3 * warnings));
567	fputc('\n', stderr);
568    }
569
570restart:
571
572    /*
573     *  main loop -- repeat while display count is positive or while it
574     *		indicates infinity (by being -1)
575     */
576
577    while ((displays == -1) || (displays-- > 0))
578    {
579	int (*compare)();
580
581
582	/* get the current stats */
583	get_system_info(&system_info);
584
585#ifdef ORDER
586	compare = compares[order_index];
587#else
588	if (displaymode == DISP_CPU)
589		compare = proc_compare;
590	else
591		compare = io_compare;
592#endif
593
594	/* get the current set of processes */
595	processes =
596		get_process_info(&system_info, &ps, compare);
597
598	/* display the load averages */
599	(*d_loadave)(system_info.last_pid,
600		     system_info.load_avg);
601
602	/* display the current time */
603	/* this method of getting the time SHOULD be fairly portable */
604	time(&curr_time);
605	i_uptime(&system_info.boottime, &curr_time);
606	i_timeofday(&curr_time);
607
608	/* display process state breakdown */
609	(*d_procstates)(system_info.p_total,
610			system_info.procstates);
611
612	/* display the cpu state percentage breakdown */
613	if (dostates)	/* but not the first time */
614	{
615	    (*d_cpustates)(system_info.cpustates);
616	}
617	else
618	{
619	    /* we'll do it next time */
620	    if (smart_terminal)
621	    {
622		z_cpustates();
623	    }
624	    else
625	    {
626		putchar('\n');
627	    }
628	    dostates = Yes;
629	}
630
631	/* display memory stats */
632	(*d_memory)(system_info.memory);
633
634	/* display swap stats */
635	(*d_swap)(system_info.swap);
636
637	/* handle message area */
638	(*d_message)();
639
640	/* update the header area */
641	(*d_header)(header_text);
642
643	if (topn > 0)
644	{
645	    /* determine number of processes to actually display */
646	    /* this number will be the smallest of:  active processes,
647	       number user requested, number current screen accomodates */
648	    active_procs = system_info.P_ACTIVE;
649	    if (active_procs > topn)
650	    {
651		active_procs = topn;
652	    }
653	    if (active_procs > max_topn)
654	    {
655		active_procs = max_topn;
656	    }
657
658	    /* now show the top "n" processes. */
659	    for (i = 0; i < active_procs; i++)
660	    {
661		(*d_process)(i, format_next_process(processes, get_userid,
662			     fmt_flags));
663	    }
664	}
665	else
666	{
667	    i = 0;
668	}
669
670	/* do end-screen processing */
671	u_endscreen(i);
672
673	/* now, flush the output buffer */
674	if (fflush(stdout) != 0)
675	{
676	    new_message(MT_standout, " Write error on stdout");
677	    putchar('\r');
678	    quit(1);
679	    /*NOTREACHED*/
680	}
681
682	/* only do the rest if we have more displays to show */
683	if (displays)
684	{
685	    /* switch out for new display on smart terminals */
686	    if (smart_terminal)
687	    {
688		if (overstrike)
689		{
690		    reset_display();
691		}
692		else
693		{
694		    d_loadave = u_loadave;
695		    d_procstates = u_procstates;
696		    d_cpustates = u_cpustates;
697		    d_memory = u_memory;
698		    d_swap = u_swap;
699		    d_message = u_message;
700		    d_header = u_header;
701		    d_process = u_process;
702		}
703	    }
704
705	    no_command = Yes;
706	    if (!interactive)
707	    {
708		/* set up alarm */
709		(void) signal(SIGALRM, onalrm);
710		(void) alarm((unsigned)delay);
711
712		/* wait for the rest of it .... */
713		pause();
714	    }
715	    else while (no_command)
716	    {
717		/* assume valid command unless told otherwise */
718		no_command = No;
719
720		/* set up arguments for select with timeout */
721		FD_ZERO(&readfds);
722		FD_SET(0, &readfds);		/* for standard input */
723		timeout.tv_sec  = delay;
724		timeout.tv_usec = 0;
725
726		if (leaveflag) {
727		    end_screen();
728		    exit(0);
729		}
730
731		if (tstopflag) {
732		    /* move to the lower left */
733		    end_screen();
734		    fflush(stdout);
735
736		    /* default the signal handler action */
737		    (void) signal(SIGTSTP, SIG_DFL);
738
739		    /* unblock the signal and send ourselves one */
740#ifdef SIGRELSE
741		    sigrelse(SIGTSTP);
742#else
743		    (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
744#endif
745		    (void) kill(0, SIGTSTP);
746
747		    /* reset the signal handler */
748		    (void) signal(SIGTSTP, tstop);
749
750		    /* reinit screen */
751		    reinit_screen();
752		    reset_display();
753		    tstopflag = 0;
754		    goto restart;
755		}
756
757		if (winchflag) {
758		    /* reascertain the screen dimensions */
759		    get_screensize();
760
761		    /* tell display to resize */
762		    max_topn = display_resize();
763
764		    /* reset the signal handler */
765		    (void) signal(SIGWINCH, winch);
766
767		    reset_display();
768		    winchflag = 0;
769		    goto restart;
770		}
771
772		/* wait for either input or the end of the delay period */
773		sel_ret = select(2, &readfds, NULL, NULL, &timeout);
774		if (sel_ret < 0 && errno != EINTR)
775		    quit(0);
776		if (sel_ret > 0)
777		{
778		    int newval;
779		    char *errmsg;
780
781		    /* something to read -- clear the message area first */
782		    clear_message();
783
784		    /* now read it and convert to command strchr */
785		    /* (use "change" as a temporary to hold strchr) */
786		    if (read(0, &ch, 1) != 1)
787		    {
788			/* read error: either 0 or -1 */
789			new_message(MT_standout, " Read error on stdin");
790			putchar('\r');
791			quit(1);
792			/*NOTREACHED*/
793		    }
794		    if ((iptr = strchr(command_chars, ch)) == NULL)
795		    {
796			if (ch != '\r' && ch != '\n')
797			{
798			    /* illegal command */
799			    new_message(MT_standout, " Command not understood");
800			}
801			putchar('\r');
802			no_command = Yes;
803		    }
804		    else
805		    {
806			change = iptr - command_chars;
807			if (overstrike && change > CMD_OSLIMIT)
808			{
809			    /* error */
810			    new_message(MT_standout,
811			    " Command cannot be handled by this terminal");
812			    putchar('\r');
813			    no_command = Yes;
814			}
815			else switch(change)
816			{
817			    case CMD_redraw:	/* redraw screen */
818				reset_display();
819				break;
820
821			    case CMD_update:	/* merely update display */
822				/* is the load average high? */
823				if (system_info.load_avg[0] > LoadMax)
824				{
825				    /* yes, go home for visual feedback */
826				    go_home();
827				    fflush(stdout);
828				}
829				break;
830
831			    case CMD_quit:	/* quit */
832				quit(0);
833				/*NOTREACHED*/
834				break;
835
836			    case CMD_help1:	/* help */
837			    case CMD_help2:
838				reset_display();
839				clear();
840				show_help();
841				standout("Hit any key to continue: ");
842				fflush(stdout);
843				(void) read(0, &ch, 1);
844				break;
845
846			    case CMD_errors:	/* show errors */
847				if (error_count() == 0)
848				{
849				    new_message(MT_standout,
850					" Currently no errors to report.");
851				    putchar('\r');
852				    no_command = Yes;
853				}
854				else
855				{
856				    reset_display();
857				    clear();
858				    show_errors();
859				    standout("Hit any key to continue: ");
860				    fflush(stdout);
861				    (void) read(0, &ch, 1);
862				}
863				break;
864
865			    case CMD_number1:	/* new number */
866			    case CMD_number2:
867				new_message(MT_standout,
868				    "Number of processes to show: ");
869				newval = readline(tempbuf1, 8, Yes);
870				if (newval > -1)
871				{
872				    if (newval > max_topn)
873				    {
874					new_message(MT_standout | MT_delayed,
875					  " This terminal can only display %d processes.",
876					  max_topn);
877					putchar('\r');
878				    }
879
880				    if (newval == 0)
881				    {
882					/* inhibit the header */
883					display_header(No);
884				    }
885				    else if (newval > topn && topn == 0)
886				    {
887					/* redraw the header */
888					display_header(Yes);
889					d_header = i_header;
890				    }
891				    topn = newval;
892				}
893				break;
894
895			    case CMD_delay:	/* new seconds delay */
896				new_message(MT_standout, "Seconds to delay: ");
897				if ((i = readline(tempbuf1, 8, Yes)) > -1)
898				{
899				    if ((delay = i) == 0 && getuid() != 0)
900				    {
901					delay = 1;
902				    }
903				}
904				clear_message();
905				break;
906
907			    case CMD_displays:	/* change display count */
908				new_message(MT_standout,
909					"Displays to show (currently %s): ",
910					displays == -1 ? "infinite" :
911							 itoa(displays));
912				if ((i = readline(tempbuf1, 10, Yes)) > 0)
913				{
914				    displays = i;
915				}
916				else if (i == 0)
917				{
918				    quit(0);
919				}
920				clear_message();
921				break;
922
923			    case CMD_kill:	/* kill program */
924				new_message(0, "kill ");
925				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
926				{
927				    if ((errmsg = kill_procs(tempbuf2)) != NULL)
928				    {
929					new_message(MT_standout, "%s", errmsg);
930					putchar('\r');
931					no_command = Yes;
932				    }
933				}
934				else
935				{
936				    clear_message();
937				}
938				break;
939
940			    case CMD_renice:	/* renice program */
941				new_message(0, "renice ");
942				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
943				{
944				    if ((errmsg = renice_procs(tempbuf2)) != NULL)
945				    {
946					new_message(MT_standout, "%s", errmsg);
947					putchar('\r');
948					no_command = Yes;
949				    }
950				}
951				else
952				{
953				    clear_message();
954				}
955				break;
956
957			    case CMD_idletog:
958			    case CMD_idletog2:
959				ps.idle = !ps.idle;
960				new_message(MT_standout | MT_delayed,
961				    " %sisplaying idle processes.",
962				    ps.idle ? "D" : "Not d");
963				putchar('\r');
964				break;
965
966			    case CMD_selftog:
967				ps.self = (ps.self == -1) ? getpid() : -1;
968				new_message(MT_standout | MT_delayed,
969				    " %sisplaying self.",
970				    (ps.self == -1) ? "D" : "Not d");
971				putchar('\r');
972				break;
973
974			    case CMD_user:
975				new_message(MT_standout,
976				    "Username to show: ");
977				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
978				{
979				    if (tempbuf2[0] == '+' &&
980					tempbuf2[1] == '\0')
981				    {
982					ps.uid = -1;
983				    }
984				    else if ((i = userid(tempbuf2)) == -1)
985				    {
986					new_message(MT_standout,
987					    " %s: unknown user", tempbuf2);
988					no_command = Yes;
989				    }
990				    else
991				    {
992					ps.uid = i;
993				    }
994				    putchar('\r');
995				}
996				else
997				{
998				    clear_message();
999				}
1000				break;
1001
1002			    case CMD_thrtog:
1003				ps.thread = !ps.thread;
1004				new_message(MT_standout | MT_delayed,
1005				    "Displaying threads %s",
1006				    ps.thread ? "separately" : "as a count");
1007				header_text = format_header(uname_field);
1008				reset_display();
1009				putchar('\r');
1010				break;
1011			    case CMD_wcputog:
1012				ps.wcpu = !ps.wcpu;
1013				new_message(MT_standout | MT_delayed,
1014				    "Displaying %sCPU",
1015				    ps.wcpu ? "W" : "");
1016				header_text = format_header(uname_field);
1017				reset_display();
1018				putchar('\r');
1019				break;
1020			    case CMD_viewtog:
1021				if (++displaymode == DISP_MAX)
1022					displaymode = 0;
1023				header_text = format_header(uname_field);
1024				display_header(Yes);
1025				d_header = i_header;
1026				reset_display();
1027				break;
1028			    case CMD_viewsys:
1029				ps.system = !ps.system;
1030				break;
1031			    case CMD_showargs:
1032				fmt_flags ^= FMT_SHOWARGS;
1033				break;
1034#ifdef ORDER
1035			    case CMD_order:
1036				new_message(MT_standout,
1037				    "Order to sort: ");
1038				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1039				{
1040				  if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1041					{
1042					  new_message(MT_standout,
1043					      " %s: unrecognized sorting order", tempbuf2);
1044					  no_command = Yes;
1045				    }
1046				    else
1047				    {
1048					order_index = i;
1049				    }
1050				    putchar('\r');
1051				}
1052				else
1053				{
1054				    clear_message();
1055				}
1056				break;
1057#endif
1058
1059			    default:
1060				new_message(MT_standout, " BAD CASE IN SWITCH!");
1061				putchar('\r');
1062			}
1063		    }
1064
1065		    /* flush out stuff that may have been written */
1066		    fflush(stdout);
1067		}
1068	    }
1069	}
1070    }
1071
1072#ifdef DEBUG
1073    fclose(debug);
1074#endif
1075    quit(0);
1076    /*NOTREACHED*/
1077}
1078
1079/*
1080 *  reset_display() - reset all the display routine pointers so that entire
1081 *	screen will get redrawn.
1082 */
1083
1084reset_display()
1085
1086{
1087    d_loadave    = i_loadave;
1088    d_procstates = i_procstates;
1089    d_cpustates  = i_cpustates;
1090    d_memory     = i_memory;
1091    d_swap       = i_swap;
1092    d_message	 = i_message;
1093    d_header	 = i_header;
1094    d_process	 = i_process;
1095}
1096
1097/*
1098 *  signal handlers
1099 */
1100
1101sigret_t leave()	/* exit under normal conditions -- INT handler */
1102
1103{
1104    leaveflag = 1;
1105}
1106
1107sigret_t tstop(i)	/* SIGTSTP handler */
1108
1109int i;
1110
1111{
1112    tstopflag = 1;
1113}
1114
1115#ifdef SIGWINCH
1116sigret_t winch(i)		/* SIGWINCH handler */
1117
1118int i;
1119
1120{
1121    winchflag = 1;
1122}
1123#endif
1124
1125void quit(status)		/* exit under duress */
1126
1127int status;
1128
1129{
1130    end_screen();
1131    exit(status);
1132    /*NOTREACHED*/
1133}
1134
1135sigret_t onalrm()	/* SIGALRM handler */
1136
1137{
1138    /* this is only used in batch mode to break out of the pause() */
1139    /* return; */
1140}
1141
1142