top.c revision 131829 
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 131829 2004-07-08 16:45:55Z 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 */
87char *myname = "top";
88jmp_buf jmp_int;
89
90/* routines that don't return int */
91
92char *username();
93char *ctime();
94char *kill_procs();
95char *renice_procs();
96
97#ifdef ORDER
98extern int (*proc_compares[])();
99extern int (*io_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    struct process_select ps;
184#ifdef ORDER
185    char *order_name = NULL;
186    int order_index = 0;
187#endif
188#ifndef FD_SET
189    /* FD_SET and friends are not present:  fake it */
190    typedef int fd_set;
191#define FD_ZERO(x)     (*(x) = 0)
192#define FD_SET(f, x)   (*(x) = 1<<f)
193#endif
194    fd_set readfds;
195
196#ifdef ORDER
197    static char command_chars[] = "\f qh?en#sdkriIutHmo";
198#else
199    static char command_chars[] = "\f qh?en#sdkriIutHm";
200#endif
201/* these defines enumerate the "strchr"s of the commands in command_chars */
202#define CMD_redraw	0
203#define CMD_update	1
204#define CMD_quit	2
205#define CMD_help1	3
206#define CMD_help2	4
207#define CMD_OSLIMIT	4    /* terminals with OS can only handle commands */
208#define CMD_errors	5    /* less than or equal to CMD_OSLIMIT	   */
209#define CMD_number1	6
210#define CMD_number2	7
211#define CMD_delay	8
212#define CMD_displays	9
213#define CMD_kill	10
214#define CMD_renice	11
215#define CMD_idletog     12
216#define CMD_idletog2    13
217#define CMD_user	14
218#define CMD_selftog	15
219#define CMD_thrtog	16
220#define CMD_viewtog	17
221#ifdef ORDER
222#define CMD_order       18
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	if (displaymode == DISP_CPU)
573		compare = proc_compares[order_index];
574	else
575		compare = io_compares[order_index];
576#else
577	if (displaymode == DISP_CPU)
578		compare = proc_compare;
579	else
580		compare = io_compare;
581#endif
582
583	/* get the current set of processes */
584	processes =
585		get_process_info(&system_info, &ps, compare);
586
587	/* display the load averages */
588	(*d_loadave)(system_info.last_pid,
589		     system_info.load_avg);
590
591	/* display the current time */
592	/* this method of getting the time SHOULD be fairly portable */
593	time(&curr_time);
594	i_uptime(&system_info.boottime, &curr_time);
595	i_timeofday(&curr_time);
596
597	/* display process state breakdown */
598	(*d_procstates)(system_info.p_total,
599			system_info.procstates);
600
601	/* display the cpu state percentage breakdown */
602	if (dostates)	/* but not the first time */
603	{
604	    (*d_cpustates)(system_info.cpustates);
605	}
606	else
607	{
608	    /* we'll do it next time */
609	    if (smart_terminal)
610	    {
611		z_cpustates();
612	    }
613	    else
614	    {
615		putchar('\n');
616	    }
617	    dostates = Yes;
618	}
619
620	/* display memory stats */
621	(*d_memory)(system_info.memory);
622
623	/* display swap stats */
624	(*d_swap)(system_info.swap);
625
626	/* handle message area */
627	(*d_message)();
628
629	/* update the header area */
630	(*d_header)(header_text);
631
632	if (topn > 0)
633	{
634	    /* determine number of processes to actually display */
635	    /* this number will be the smallest of:  active processes,
636	       number user requested, number current screen accomodates */
637	    active_procs = system_info.P_ACTIVE;
638	    if (active_procs > topn)
639	    {
640		active_procs = topn;
641	    }
642	    if (active_procs > max_topn)
643	    {
644		active_procs = max_topn;
645	    }
646
647	    /* now show the top "n" processes. */
648	    for (i = 0; i < active_procs; i++)
649	    {
650		(*d_process)(i, format_next_process(processes, get_userid));
651	    }
652	}
653	else
654	{
655	    i = 0;
656	}
657
658	/* do end-screen processing */
659	u_endscreen(i);
660
661	/* now, flush the output buffer */
662	if (fflush(stdout) != 0)
663	{
664	    new_message(MT_standout, " Write error on stdout");
665	    putchar('\r');
666	    quit(1);
667	    /*NOTREACHED*/
668	}
669
670	/* only do the rest if we have more displays to show */
671	if (displays)
672	{
673	    /* switch out for new display on smart terminals */
674	    if (smart_terminal)
675	    {
676		if (overstrike)
677		{
678		    reset_display();
679		}
680		else
681		{
682		    d_loadave = u_loadave;
683		    d_procstates = u_procstates;
684		    d_cpustates = u_cpustates;
685		    d_memory = u_memory;
686		    d_swap = u_swap;
687		    d_message = u_message;
688		    d_header = u_header;
689		    d_process = u_process;
690		}
691	    }
692
693	    no_command = Yes;
694	    if (!interactive)
695	    {
696		/* set up alarm */
697		(void) signal(SIGALRM, onalrm);
698		(void) alarm((unsigned)delay);
699
700		/* wait for the rest of it .... */
701		pause();
702	    }
703	    else while (no_command)
704	    {
705		/* assume valid command unless told otherwise */
706		no_command = No;
707
708		/* set up arguments for select with timeout */
709		FD_ZERO(&readfds);
710		FD_SET(0, &readfds);		/* for standard input */
711		timeout.tv_sec  = delay;
712		timeout.tv_usec = 0;
713
714		if (leaveflag) {
715		    end_screen();
716		    exit(0);
717		}
718
719		if (tstopflag) {
720		    /* move to the lower left */
721		    end_screen();
722		    fflush(stdout);
723
724		    /* default the signal handler action */
725		    (void) signal(SIGTSTP, SIG_DFL);
726
727		    /* unblock the signal and send ourselves one */
728#ifdef SIGRELSE
729		    sigrelse(SIGTSTP);
730#else
731		    (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
732#endif
733		    (void) kill(0, SIGTSTP);
734
735		    /* reset the signal handler */
736		    (void) signal(SIGTSTP, tstop);
737
738		    /* reinit screen */
739		    reinit_screen();
740		    reset_display();
741		    tstopflag = 0;
742		    goto restart;
743		}
744
745		if (winchflag) {
746		    /* reascertain the screen dimensions */
747		    get_screensize();
748
749		    /* tell display to resize */
750		    max_topn = display_resize();
751
752		    /* reset the signal handler */
753		    (void) signal(SIGWINCH, winch);
754
755		    reset_display();
756		    winchflag = 0;
757		    goto restart;
758		}
759
760		/* wait for either input or the end of the delay period */
761		sel_ret = select(2, &readfds, NULL, NULL, &timeout);
762		if (sel_ret < 0 && errno != EINTR)
763		    quit(0);
764		if (sel_ret > 0)
765		{
766		    int newval;
767		    char *errmsg;
768
769		    /* something to read -- clear the message area first */
770		    clear_message();
771
772		    /* now read it and convert to command strchr */
773		    /* (use "change" as a temporary to hold strchr) */
774		    if (read(0, &ch, 1) != 1)
775		    {
776			/* read error: either 0 or -1 */
777			new_message(MT_standout, " Read error on stdin");
778			putchar('\r');
779			quit(1);
780			/*NOTREACHED*/
781		    }
782		    if ((iptr = strchr(command_chars, ch)) == NULL)
783		    {
784			if (ch != '\r' && ch != '\n')
785			{
786			    /* illegal command */
787			    new_message(MT_standout, " Command not understood");
788			}
789			putchar('\r');
790			no_command = Yes;
791		    }
792		    else
793		    {
794			change = iptr - command_chars;
795			if (overstrike && change > CMD_OSLIMIT)
796			{
797			    /* error */
798			    new_message(MT_standout,
799			    " Command cannot be handled by this terminal");
800			    putchar('\r');
801			    no_command = Yes;
802			}
803			else switch(change)
804			{
805			    case CMD_redraw:	/* redraw screen */
806				reset_display();
807				break;
808
809			    case CMD_update:	/* merely update display */
810				/* is the load average high? */
811				if (system_info.load_avg[0] > LoadMax)
812				{
813				    /* yes, go home for visual feedback */
814				    go_home();
815				    fflush(stdout);
816				}
817				break;
818
819			    case CMD_quit:	/* quit */
820				quit(0);
821				/*NOTREACHED*/
822				break;
823
824			    case CMD_help1:	/* help */
825			    case CMD_help2:
826				reset_display();
827				clear();
828				show_help();
829				standout("Hit any key to continue: ");
830				fflush(stdout);
831				(void) read(0, &ch, 1);
832				break;
833
834			    case CMD_errors:	/* show errors */
835				if (error_count() == 0)
836				{
837				    new_message(MT_standout,
838					" Currently no errors to report.");
839				    putchar('\r');
840				    no_command = Yes;
841				}
842				else
843				{
844				    reset_display();
845				    clear();
846				    show_errors();
847				    standout("Hit any key to continue: ");
848				    fflush(stdout);
849				    (void) read(0, &ch, 1);
850				}
851				break;
852
853			    case CMD_number1:	/* new number */
854			    case CMD_number2:
855				new_message(MT_standout,
856				    "Number of processes to show: ");
857				newval = readline(tempbuf1, 8, Yes);
858				if (newval > -1)
859				{
860				    if (newval > max_topn)
861				    {
862					new_message(MT_standout | MT_delayed,
863					  " This terminal can only display %d processes.",
864					  max_topn);
865					putchar('\r');
866				    }
867
868				    if (newval == 0)
869				    {
870					/* inhibit the header */
871					display_header(No);
872				    }
873				    else if (newval > topn && topn == 0)
874				    {
875					/* redraw the header */
876					display_header(Yes);
877					d_header = i_header;
878				    }
879				    topn = newval;
880				}
881				break;
882
883			    case CMD_delay:	/* new seconds delay */
884				new_message(MT_standout, "Seconds to delay: ");
885				if ((i = readline(tempbuf1, 8, Yes)) > -1)
886				{
887				    if ((delay = i) == 0 && getuid() != 0)
888				    {
889					delay = 1;
890				    }
891				}
892				clear_message();
893				break;
894
895			    case CMD_displays:	/* change display count */
896				new_message(MT_standout,
897					"Displays to show (currently %s): ",
898					displays == -1 ? "infinite" :
899							 itoa(displays));
900				if ((i = readline(tempbuf1, 10, Yes)) > 0)
901				{
902				    displays = i;
903				}
904				else if (i == 0)
905				{
906				    quit(0);
907				}
908				clear_message();
909				break;
910
911			    case CMD_kill:	/* kill program */
912				new_message(0, "kill ");
913				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
914				{
915				    if ((errmsg = kill_procs(tempbuf2)) != NULL)
916				    {
917					new_message(MT_standout, "%s", errmsg);
918					putchar('\r');
919					no_command = Yes;
920				    }
921				}
922				else
923				{
924				    clear_message();
925				}
926				break;
927
928			    case CMD_renice:	/* renice program */
929				new_message(0, "renice ");
930				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
931				{
932				    if ((errmsg = renice_procs(tempbuf2)) != NULL)
933				    {
934					new_message(MT_standout, "%s", errmsg);
935					putchar('\r');
936					no_command = Yes;
937				    }
938				}
939				else
940				{
941				    clear_message();
942				}
943				break;
944
945			    case CMD_idletog:
946			    case CMD_idletog2:
947				ps.idle = !ps.idle;
948				new_message(MT_standout | MT_delayed,
949				    " %sisplaying idle processes.",
950				    ps.idle ? "D" : "Not d");
951				putchar('\r');
952				break;
953
954			    case CMD_selftog:
955				ps.self = (ps.self == -1) ? getpid() : -1;
956				new_message(MT_standout | MT_delayed,
957				    " %sisplaying self.",
958				    (ps.self == -1) ? "D" : "Not d");
959				putchar('\r');
960				break;
961
962			    case CMD_user:
963				new_message(MT_standout,
964				    "Username to show: ");
965				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
966				{
967				    if (tempbuf2[0] == '+' &&
968					tempbuf2[1] == '\0')
969				    {
970					ps.uid = -1;
971				    }
972				    else if ((i = userid(tempbuf2)) == -1)
973				    {
974					new_message(MT_standout,
975					    " %s: unknown user", tempbuf2);
976					no_command = Yes;
977				    }
978				    else
979				    {
980					ps.uid = i;
981				    }
982				    putchar('\r');
983				}
984				else
985				{
986				    clear_message();
987				}
988				break;
989
990			    case CMD_thrtog:
991				ps.thread = !ps.thread;
992				new_message(MT_standout | MT_delayed,
993				    " %sisplaying threads.",
994				    ps.thread ? "D" : "Not d");
995				putchar('\r');
996				break;
997			    case CMD_viewtog:
998				if (++displaymode == DISP_MAX)
999					displaymode = 0;
1000				header_text = format_header(uname_field);
1001				display_header(Yes);
1002				d_header = i_header;
1003				reset_display();
1004				break;
1005#ifdef ORDER
1006			    case CMD_order:
1007				new_message(MT_standout,
1008				    "Order to sort: ");
1009				if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
1010				{
1011				  if ((i = string_index(tempbuf2, statics.order_names)) == -1)
1012					{
1013					  new_message(MT_standout,
1014					      " %s: unrecognized sorting order", tempbuf2);
1015					  no_command = Yes;
1016				    }
1017				    else
1018				    {
1019					order_index = i;
1020				    }
1021				    putchar('\r');
1022				}
1023				else
1024				{
1025				    clear_message();
1026				}
1027				break;
1028#endif
1029
1030			    default:
1031				new_message(MT_standout, " BAD CASE IN SWITCH!");
1032				putchar('\r');
1033			}
1034		    }
1035
1036		    /* flush out stuff that may have been written */
1037		    fflush(stdout);
1038		}
1039	    }
1040	}
1041    }
1042
1043#ifdef DEBUG
1044    fclose(debug);
1045#endif
1046    quit(0);
1047    /*NOTREACHED*/
1048}
1049
1050/*
1051 *  reset_display() - reset all the display routine pointers so that entire
1052 *	screen will get redrawn.
1053 */
1054
1055reset_display()
1056
1057{
1058    d_loadave    = i_loadave;
1059    d_procstates = i_procstates;
1060    d_cpustates  = i_cpustates;
1061    d_memory     = i_memory;
1062    d_swap       = i_swap;
1063    d_message	 = i_message;
1064    d_header	 = i_header;
1065    d_process	 = i_process;
1066}
1067
1068/*
1069 *  signal handlers
1070 */
1071
1072sigret_t leave()	/* exit under normal conditions -- INT handler */
1073
1074{
1075    leaveflag = 1;
1076}
1077
1078sigret_t tstop(i)	/* SIGTSTP handler */
1079
1080int i;
1081
1082{
1083    tstopflag = 1;
1084}
1085
1086#ifdef SIGWINCH
1087sigret_t winch(i)		/* SIGWINCH handler */
1088
1089int i;
1090
1091{
1092    winchflag = 1;
1093}
1094#endif
1095
1096void quit(status)		/* exit under duress */
1097
1098int status;
1099
1100{
1101    end_screen();
1102    exit(status);
1103    /*NOTREACHED*/
1104}
1105
1106sigret_t onalrm()	/* SIGALRM handler */
1107
1108{
1109    /* this is only used in batch mode to break out of the pause() */
1110    /* return; */
1111}
1112
1113