top.c revision 157866 
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 157866 2006-04-19 12:19:06Z ru $
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#sdkriIutHmSCo";
197#else
198    static char command_chars[] = "\f qh?en#sdkriIutHmSC";
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#define	CMD_wcputog	19
222#ifdef ORDER
223#define CMD_order       20
224#endif
225
226    /* set the buffer for stdout */
227#ifdef DEBUG
228    extern FILE *debug;
229    debug = fopen("debug.run", "w");
230    setbuffer(stdout, NULL, 0);
231#else
232    setbuffer(stdout, stdoutbuf, Buffersize);
233#endif
234
235    /* get our name */
236    if (argc > 0)
237    {
238	if ((myname = strrchr(argv[0], '/')) == 0)
239	{
240	    myname = argv[0];
241	}
242	else
243	{
244	    myname++;
245	}
246    }
247
248    /* initialize some selection options */
249    ps.idle    = Yes;
250    ps.self    = -1;
251    ps.system  = No;
252    ps.uid     = -1;
253    ps.thread  = No;
254    ps.wcpu    = 1;
255    ps.command = NULL;
256
257    /* get preset options from the environment */
258    if ((env_top = getenv("TOP")) != NULL)
259    {
260	av = preset_argv = argparse(env_top, &preset_argc);
261	ac = preset_argc;
262
263	/* set the dummy argument to an explanatory message, in case
264	   getopt encounters a bad argument */
265	preset_argv[0] = "while processing environment";
266    }
267
268    /* process options */
269    do {
270	/* if we're done doing the presets, then process the real arguments */
271	if (preset_argc == 0)
272	{
273	    ac = argc;
274	    av = argv;
275
276	    /* this should keep getopt happy... */
277	    optind = 1;
278	}
279
280	while ((i = getopt(ac, av, "CSIHbinquvs:d:U:m:o:t")) != EOF)
281	{
282	    switch(i)
283	    {
284	      case 'v':			/* show version number */
285		fprintf(stderr, "%s: version %s\n",
286			myname, version_string());
287		exit(1);
288		break;
289
290	      case 'u':			/* toggle uid/username display */
291		do_unames = !do_unames;
292		break;
293
294	      case 'U':			/* display only username's processes */
295		if ((ps.uid = userid(optarg)) == -1)
296		{
297		    fprintf(stderr, "%s: unknown user\n", optarg);
298		    exit(1);
299		}
300		break;
301
302	      case 'S':			/* show system processes */
303		ps.system = !ps.system;
304		break;
305
306	      case 'I':                   /* show idle processes */
307		ps.idle = !ps.idle;
308		break;
309
310	      case 'i':			/* go interactive regardless */
311		interactive = Yes;
312		break;
313
314	      case 'n':			/* batch, or non-interactive */
315	      case 'b':
316		interactive = No;
317		break;
318
319	      case 'd':			/* number of displays to show */
320		if ((i = atoiwi(optarg)) == Invalid || i == 0)
321		{
322		    fprintf(stderr,
323			"%s: warning: display count should be positive -- option ignored\n",
324			myname);
325		    warnings++;
326		}
327		else
328		{
329		    displays = i;
330		}
331		break;
332
333	      case 's':
334		if ((delay = atoi(optarg)) < 0 || (delay == 0 && getuid() != 0))
335		{
336		    fprintf(stderr,
337			"%s: warning: seconds delay should be positive -- using default\n",
338			myname);
339		    delay = Default_DELAY;
340		    warnings++;
341		}
342		break;
343
344	      case 'q':		/* be quick about it */
345		/* only allow this if user is really root */
346		if (getuid() == 0)
347		{
348		    /* be very un-nice! */
349		    (void) nice(-20);
350		}
351		else
352		{
353		    fprintf(stderr,
354			"%s: warning: `-q' option can only be used by root\n",
355			myname);
356		    warnings++;
357		}
358		break;
359
360	      case 'm':		/* select display mode */
361		if (strcmp(optarg, "io") == 0) {
362			displaymode = DISP_IO;
363		} else if (strcmp(optarg, "cpu") == 0) {
364			displaymode = DISP_CPU;
365		} else {
366			fprintf(stderr,
367			"%s: warning: `-m' option can only take args "
368			"'io' or 'cpu'\n",
369			myname);
370			exit(1);
371		}
372		break;
373
374	      case 'o':		/* select sort order */
375#ifdef ORDER
376		order_name = optarg;
377#else
378		fprintf(stderr,
379			"%s: this platform does not support arbitrary ordering.  Sorry.\n",
380			myname);
381		warnings++;
382#endif
383		break;
384
385	      case 't':
386		ps.self = (ps.self == -1) ? getpid() : -1;
387		break;
388
389	      case 'C':
390		ps.wcpu = !ps.wcpu;
391		break;
392
393	      case 'H':
394		ps.thread = !ps.thread;
395		break;
396
397	      default:
398		fprintf(stderr,
399"Top version %s\n"
400"Usage: %s [-bCHIinqStuv] [-d count] [-m io | cpu] [-o field] [-s time]\n"
401"       [-U username] [number]\n",
402			version_string(), myname);
403		exit(1);
404	    }
405	}
406
407	/* get count of top processes to display (if any) */
408	if (optind < ac)
409	{
410	    if ((topn = atoiwi(av[optind])) == Invalid)
411	    {
412		fprintf(stderr,
413			"%s: warning: process display count should be non-negative -- using default\n",
414			myname);
415		warnings++;
416	    }
417#if Default_TOPN == Infinity
418            else
419	    {
420		topn_specified = Yes;
421	    }
422#endif
423	}
424
425	/* tricky:  remember old value of preset_argc & set preset_argc = 0 */
426	i = preset_argc;
427	preset_argc = 0;
428
429    /* repeat only if we really did the preset arguments */
430    } while (i != 0);
431
432    /* set constants for username/uid display correctly */
433    if (!do_unames)
434    {
435	uname_field = "   UID  ";
436	get_userid = itoa7;
437    }
438
439    /* initialize the kernel memory interface */
440    if (machine_init(&statics) == -1)
441    {
442	exit(1);
443    }
444
445#ifdef ORDER
446    /* determine sorting order index, if necessary */
447    if (order_name != NULL)
448    {
449	if ((order_index = string_index(order_name, statics.order_names)) == -1)
450	{
451	    char **pp;
452
453	    fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
454		    myname, order_name);
455	    fprintf(stderr, "\tTry one of these:");
456	    pp = statics.order_names;
457	    while (*pp != NULL)
458	    {
459		fprintf(stderr, " %s", *pp++);
460	    }
461	    fputc('\n', stderr);
462	    exit(1);
463	}
464    }
465#endif
466
467#ifdef no_initialization_needed
468    /* initialize the hashing stuff */
469    if (do_unames)
470    {
471	init_hash();
472    }
473#endif
474
475    /* initialize termcap */
476    init_termcap(interactive);
477
478    /* get the string to use for the process area header */
479    header_text = format_header(uname_field);
480
481    /* initialize display interface */
482    if ((max_topn = display_init(&statics)) == -1)
483    {
484	fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
485	exit(4);
486    }
487
488    /* print warning if user requested more processes than we can display */
489    if (topn > max_topn)
490    {
491	fprintf(stderr,
492		"%s: warning: this terminal can only display %d processes.\n",
493		myname, max_topn);
494	warnings++;
495    }
496
497    /* adjust for topn == Infinity */
498    if (topn == Infinity)
499    {
500	/*
501	 *  For smart terminals, infinity really means everything that can
502	 *  be displayed, or Largest.
503	 *  On dumb terminals, infinity means every process in the system!
504	 *  We only really want to do that if it was explicitly specified.
505	 *  This is always the case when "Default_TOPN != Infinity".  But if
506	 *  topn wasn't explicitly specified and we are on a dumb terminal
507	 *  and the default is Infinity, then (and only then) we use
508	 *  "Nominal_TOPN" instead.
509	 */
510#if Default_TOPN == Infinity
511	topn = smart_terminal ? Largest :
512		    (topn_specified ? Largest : Nominal_TOPN);
513#else
514	topn = Largest;
515#endif
516    }
517
518    /* set header display accordingly */
519    display_header(topn > 0);
520
521    /* determine interactive state */
522    if (interactive == Maybe)
523    {
524	interactive = smart_terminal;
525    }
526
527    /* if # of displays not specified, fill it in */
528    if (displays == 0)
529    {
530	displays = smart_terminal ? Infinity : 1;
531    }
532
533    /* hold interrupt signals while setting up the screen and the handlers */
534#ifdef SIGHOLD
535    sighold(SIGINT);
536    sighold(SIGQUIT);
537    sighold(SIGTSTP);
538#else
539    old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
540#endif
541    init_screen();
542    (void) signal(SIGINT, leave);
543    (void) signal(SIGQUIT, leave);
544    (void) signal(SIGTSTP, tstop);
545#ifdef SIGWINCH
546    (void) signal(SIGWINCH, winch);
547#endif
548#ifdef SIGRELSE
549    sigrelse(SIGINT);
550    sigrelse(SIGQUIT);
551    sigrelse(SIGTSTP);
552#else
553    (void) sigsetmask(old_sigmask);
554#endif
555    if (warnings)
556    {
557	fputs("....", stderr);
558	fflush(stderr);			/* why must I do this? */
559	sleep((unsigned)(3 * warnings));
560	fputc('\n', stderr);
561    }
562
563restart:
564
565    /*
566     *  main loop -- repeat while display count is positive or while it
567     *		indicates infinity (by being -1)
568     */
569
570    while ((displays == -1) || (displays-- > 0))
571    {
572	int (*compare)();
573
574
575	/* get the current stats */
576	get_system_info(&system_info);
577
578#ifdef ORDER
579	compare = compares[order_index];
580#else
581	if (displaymode == DISP_CPU)
582		compare = proc_compare;
583	else
584		compare = io_compare;
585#endif
586
587	/* get the current set of processes */
588	processes =
589		get_process_info(&system_info, &ps, compare);
590
591	/* display the load averages */
592	(*d_loadave)(system_info.last_pid,
593		     system_info.load_avg);
594
595	/* display the current time */
596	/* this method of getting the time SHOULD be fairly portable */
597	time(&curr_time);
598	i_uptime(&system_info.boottime, &curr_time);
599	i_timeofday(&curr_time);
600
601	/* display process state breakdown */
602	(*d_procstates)(system_info.p_total,
603			system_info.procstates);
604
605	/* display the cpu state percentage breakdown */
606	if (dostates)	/* but not the first time */
607	{
608	    (*d_cpustates)(system_info.cpustates);
609	}
610	else
611	{
612	    /* we'll do it next time */
613	    if (smart_terminal)
614	    {
615		z_cpustates();
616	    }
617	    else
618	    {
619		putchar('\n');
620	    }
621	    dostates = Yes;
622	}
623
624	/* display memory stats */
625	(*d_memory)(system_info.memory);
626
627	/* display swap stats */
628	(*d_swap)(system_info.swap);
629
630	/* handle message area */
631	(*d_message)();
632
633	/* update the header area */
634	(*d_header)(header_text);
635
636	if (topn > 0)
637	{
638	    /* determine number of processes to actually display */
639	    /* this number will be the smallest of:  active processes,
640	       number user requested, number current screen accomodates */
641	    active_procs = system_info.P_ACTIVE;
642	    if (active_procs > topn)
643	    {
644		active_procs = topn;
645	    }
646	    if (active_procs > max_topn)
647	    {
648		active_procs = max_topn;
649	    }
650
651	    /* now show the top "n" processes. */
652	    for (i = 0; i < active_procs; i++)
653	    {
654		(*d_process)(i, format_next_process(processes, get_userid));
655	    }
656	}
657	else
658	{
659	    i = 0;
660	}
661
662	/* do end-screen processing */
663	u_endscreen(i);
664
665	/* now, flush the output buffer */
666	if (fflush(stdout) != 0)
667	{
668	    new_message(MT_standout, " Write error on stdout");
669	    putchar('\r');
670	    quit(1);
671	    /*NOTREACHED*/
672	}
673
674	/* only do the rest if we have more displays to show */
675	if (displays)
676	{
677	    /* switch out for new display on smart terminals */
678	    if (smart_terminal)
679	    {
680		if (overstrike)
681		{
682		    reset_display();
683		}
684		else
685		{
686		    d_loadave = u_loadave;
687		    d_procstates = u_procstates;
688		    d_cpustates = u_cpustates;
689		    d_memory = u_memory;
690		    d_swap = u_swap;
691		    d_message = u_message;
692		    d_header = u_header;
693		    d_process = u_process;
694		}
695	    }
696
697	    no_command = Yes;
698	    if (!interactive)
699	    {
700		/* set up alarm */
701		(void) signal(SIGALRM, onalrm);
702		(void) alarm((unsigned)delay);
703
704		/* wait for the rest of it .... */
705		pause();
706	    }
707	    else while (no_command)
708	    {
709		/* assume valid command unless told otherwise */
710		no_command = No;
711
712		/* set up arguments for select with timeout */
713		FD_ZERO(&readfds);
714		FD_SET(0, &readfds);		/* for standard input */
715		timeout.tv_sec  = delay;
716		timeout.tv_usec = 0;
717
718		if (leaveflag) {
719		    end_screen();
720		    exit(0);
721		}
722
723		if (tstopflag) {
724		    /* move to the lower left */
725		    end_screen();
726		    fflush(stdout);
727
728		    /* default the signal handler action */
729		    (void) signal(SIGTSTP, SIG_DFL);
730
731		    /* unblock the signal and send ourselves one */
732#ifdef SIGRELSE
733		    sigrelse(SIGTSTP);
734#else
735		    (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
736#endif
737		    (void) kill(0, SIGTSTP);
738
739		    /* reset the signal handler */
740		    (void) signal(SIGTSTP, tstop);
741
742		    /* reinit screen */
743		    reinit_screen();
744		    reset_display();
745		    tstopflag = 0;
746		    goto restart;
747		}
748
749		if (winchflag) {
750		    /* reascertain the screen dimensions */
751		    get_screensize();
752
753		    /* tell display to resize */
754		    max_topn = display_resize();
755
756		    /* reset the signal handler */
757		    (void) signal(SIGWINCH, winch);
758
759		    reset_display();
760		    winchflag = 0;
761		    goto restart;
762		}
763
764		/* wait for either input or the end of the delay period */
765		sel_ret = select(2, &readfds, NULL, NULL, &timeout);
766		if (sel_ret < 0 && errno != EINTR)
767		    quit(0);
768		if (sel_ret > 0)
769		{
770		    int newval;
771		    char *errmsg;
772
773		    /* something to read -- clear the message area first */
774		    clear_message();
775
776		    /* now read it and convert to command strchr */
777		    /* (use "change" as a temporary to hold strchr) */
778		    if (read(0, &ch, 1) != 1)
779		    {
780			/* read error: either 0 or -1 */
781			new_message(MT_standout, " Read error on stdin");
782			putchar('\r');
783			quit(1);
784			/*NOTREACHED*/
785		    }
786		    if ((iptr = strchr(command_chars, ch)) == NULL)
787		    {
788			if (ch != '\r' && ch != '\n')
789			{
790			    /* illegal command */
791			    new_message(MT_standout, " Command not understood");
792			}
793			putchar('\r');
794			no_command = Yes;
795		    }
796		    else
797		    {
798			change = iptr - command_chars;
799			if (overstrike && change > CMD_OSLIMIT)
800			{
801			    /* error */
802			    new_message(MT_standout,
803			    " Command cannot be handled by this terminal");
804			    putchar('\r');
805			    no_command = Yes;
806			}
807			else switch(change)
808			{
809			    case CMD_redraw:	/* redraw screen */
810				reset_display();
811				break;
812
813			    case CMD_update:	/* merely update display */
814				/* is the load average high? */
815				if (system_info.load_avg[0] > LoadMax)
816				{
817				    /* yes, go home for visual feedback */
818				    go_home();
819				    fflush(stdout);
820				}
821				break;
822
823			    case CMD_quit:	/* quit */
824				quit(0);
825				/*NOTREACHED*/
826				break;
827
828			    case CMD_help1:	/* help */
829			    case CMD_help2:
830				reset_display();
831				clear();
832				show_help();
833				standout("Hit any key to continue: ");
834				fflush(stdout);
835				(void) read(0, &ch, 1);
836				break;
837
838			    case CMD_errors:	/* show errors */
839				if (error_count() == 0)
840				{
841				    new_message(MT_standout,
842					" Currently no errors to report.");
843				    putchar('\r');
844				    no_command = Yes;
845				}
846				else
847				{
848				    reset_display();
849				    clear();
850				    show_errors();
851				    standout("Hit any key to continue: ");
852				    fflush(stdout);
853				    (void) read(0, &ch, 1);
854				}
855				break;
856
857			    case CMD_number1:	/* new number */
858			    case CMD_number2:
859				new_message(MT_standout,
860				    "Number of processes to show: ");
861				newval = readline(tempbuf1, 8, Yes);
862				if (newval > -1)
863				{
864				    if (newval > max_topn)
865				    {
866					new_message(MT_standout | MT_delayed,
867					  " This terminal can only display %d processes.",
868					  max_topn);
869					putchar('\r');
870				    }
871
872				    if (newval == 0)
873				    {
874					/* inhibit the header */
875					display_header(No);
876				    }
877				    else if (newval > topn && topn == 0)
878				    {
879					/* redraw the header */
880					display_header(Yes);
881					d_header = i_header;
882				    }
883				    topn = newval;
884				}
885				break;
886
887			    case CMD_delay:	/* new seconds delay */
888				new_message(MT_standout, "Seconds to delay: ");
889				if ((i = readline(tempbuf1, 8, Yes)) > -1)
890				{
891				    if ((delay = i) == 0 && getuid() != 0)
892				    {
893					delay = 1;
894				    }
895				}
896				clear_message();
897				break;
898
899			    case CMD_displays:	/* change display count */
900				new_message(MT_standout,
901					"Displays to show (currently %s): ",
902					displays == -1 ? "infinite" :
903							 itoa(displays));
904				if ((i = readline(tempbuf1, 10, Yes)) > 0)
905				{
906				    displays = i;
907				}
908				else if (i == 0)
909				{
910				    quit(0);
911				}
912				clear_message();
913				break;
914
915			    case CMD_kill:	/* kill program */
916				new_message(0, "kill ");
917				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
918				{
919				    if ((errmsg = kill_procs(tempbuf2)) != NULL)
920				    {
921					new_message(MT_standout, "%s", errmsg);
922					putchar('\r');
923					no_command = Yes;
924				    }
925				}
926				else
927				{
928				    clear_message();
929				}
930				break;
931
932			    case CMD_renice:	/* renice program */
933				new_message(0, "renice ");
934				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
935				{
936				    if ((errmsg = renice_procs(tempbuf2)) != NULL)
937				    {
938					new_message(MT_standout, "%s", errmsg);
939					putchar('\r');
940					no_command = Yes;
941				    }
942				}
943				else
944				{
945				    clear_message();
946				}
947				break;
948
949			    case CMD_idletog:
950			    case CMD_idletog2:
951				ps.idle = !ps.idle;
952				new_message(MT_standout | MT_delayed,
953				    " %sisplaying idle processes.",
954				    ps.idle ? "D" : "Not d");
955				putchar('\r');
956				break;
957
958			    case CMD_selftog:
959				ps.self = (ps.self == -1) ? getpid() : -1;
960				new_message(MT_standout | MT_delayed,
961				    " %sisplaying self.",
962				    (ps.self == -1) ? "D" : "Not d");
963				putchar('\r');
964				break;
965
966			    case CMD_user:
967				new_message(MT_standout,
968				    "Username to show: ");
969				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
970				{
971				    if (tempbuf2[0] == '+' &&
972					tempbuf2[1] == '\0')
973				    {
974					ps.uid = -1;
975				    }
976				    else if ((i = userid(tempbuf2)) == -1)
977				    {
978					new_message(MT_standout,
979					    " %s: unknown user", tempbuf2);
980					no_command = Yes;
981				    }
982				    else
983				    {
984					ps.uid = i;
985				    }
986				    putchar('\r');
987				}
988				else
989				{
990				    clear_message();
991				}
992				break;
993
994			    case CMD_thrtog:
995				ps.thread = !ps.thread;
996				new_message(MT_standout | MT_delayed,
997				    "Displaying threads %s",
998				    ps.thread ? "separately" : "as a count");
999				header_text = format_header(uname_field);
1000				reset_display();
1001				putchar('\r');
1002				break;
1003			    case CMD_wcputog:
1004				ps.wcpu = !ps.wcpu;
1005				new_message(MT_standout | MT_delayed,
1006				    "Displaying %sCPU",
1007				    ps.wcpu ? "W" : "");
1008				header_text = format_header(uname_field);
1009				reset_display();
1010				putchar('\r');
1011				break;
1012			    case CMD_viewtog:
1013				if (++displaymode == DISP_MAX)
1014					displaymode = 0;
1015				header_text = format_header(uname_field);
1016				display_header(Yes);
1017				d_header = i_header;
1018				reset_display();
1019				break;
1020			    case CMD_viewsys:
1021				ps.system = !ps.system;
1022				break;
1023#ifdef ORDER
1024			    case CMD_order:
1025				new_message(MT_standout,
1026				    "Order to sort: ");
1027				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1028				{
1029				  if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1030					{
1031					  new_message(MT_standout,
1032					      " %s: unrecognized sorting order", tempbuf2);
1033					  no_command = Yes;
1034				    }
1035				    else
1036				    {
1037					order_index = i;
1038				    }
1039				    putchar('\r');
1040				}
1041				else
1042				{
1043				    clear_message();
1044				}
1045				break;
1046#endif
1047
1048			    default:
1049				new_message(MT_standout, " BAD CASE IN SWITCH!");
1050				putchar('\r');
1051			}
1052		    }
1053
1054		    /* flush out stuff that may have been written */
1055		    fflush(stdout);
1056		}
1057	    }
1058	}
1059    }
1060
1061#ifdef DEBUG
1062    fclose(debug);
1063#endif
1064    quit(0);
1065    /*NOTREACHED*/
1066}
1067
1068/*
1069 *  reset_display() - reset all the display routine pointers so that entire
1070 *	screen will get redrawn.
1071 */
1072
1073reset_display()
1074
1075{
1076    d_loadave    = i_loadave;
1077    d_procstates = i_procstates;
1078    d_cpustates  = i_cpustates;
1079    d_memory     = i_memory;
1080    d_swap       = i_swap;
1081    d_message	 = i_message;
1082    d_header	 = i_header;
1083    d_process	 = i_process;
1084}
1085
1086/*
1087 *  signal handlers
1088 */
1089
1090sigret_t leave()	/* exit under normal conditions -- INT handler */
1091
1092{
1093    leaveflag = 1;
1094}
1095
1096sigret_t tstop(i)	/* SIGTSTP handler */
1097
1098int i;
1099
1100{
1101    tstopflag = 1;
1102}
1103
1104#ifdef SIGWINCH
1105sigret_t winch(i)		/* SIGWINCH handler */
1106
1107int i;
1108
1109{
1110    winchflag = 1;
1111}
1112#endif
1113
1114void quit(status)		/* exit under duress */
1115
1116int status;
1117
1118{
1119    end_screen();
1120    exit(status);
1121    /*NOTREACHED*/
1122}
1123
1124sigret_t onalrm()	/* SIGALRM handler */
1125
1126{
1127    /* this is only used in batch mode to break out of the pause() */
1128    /* return; */
1129}
1130
1131