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1.6 ! deraadt 1: /* $OpenBSD: top.c,v 1.5 2000/11/21 07:22:19 deraadt Exp $ */
1.1 downsj 2:
1.2 downsj 3: const char copyright[] = "Copyright (c) 1984 through 1996, William LeFebvre";
1.1 downsj 4:
5: /*
6: * Top users/processes display for Unix
7: * Version 3
8: *
9: * This program may be freely redistributed,
10: * but this entire comment MUST remain intact.
11: *
12: * Copyright (c) 1984, 1989, William LeFebvre, Rice University
13: * Copyright (c) 1989, 1990, 1992, William LeFebvre, Northwestern University
14: */
15:
16: /*
17: * See the file "Changes" for information on version-to-version changes.
18: */
19:
20: /*
21: * This file contains "main" and other high-level routines.
22: */
23:
24: /*
25: * The following preprocessor variables, when defined, are used to
26: * distinguish between different Unix implementations:
27: *
28: * SIGHOLD - use SVR4 sighold function when defined
29: * SIGRELSE - use SVR4 sigrelse function when defined
30: * FD_SET - macros FD_SET and FD_ZERO are used when defined
31: */
32:
1.2 downsj 33: #include <sys/types.h>
34: #include <stdio.h>
35: #include <ctype.h>
1.1 downsj 36: #include <signal.h>
37: #include <setjmp.h>
1.2 downsj 38: #include <string.h>
39: #include <stdlib.h>
40: #include <unistd.h>
1.5 deraadt 41: #include <errno.h>
1.1 downsj 42: #include <sys/time.h>
43:
44: /* includes specific to top */
45: #include "display.h" /* interface to display package */
46: #include "screen.h" /* interface to screen package */
47: #include "top.h"
48: #include "top.local.h"
49: #include "boolean.h"
50: #include "machine.h"
51: #include "utils.h"
52:
53: /* Size of the stdio buffer given to stdout */
54: #define Buffersize 2048
55:
56: /* The buffer that stdio will use */
57: char stdoutbuf[Buffersize];
58:
59: /* build Signal masks */
60: #define Smask(s) (1 << ((s) - 1))
61:
62: /* imported from screen.c */
63: extern int overstrike;
64:
65: /* signal handling routines */
1.2 downsj 66: static void leave __P((int));
67: static void onalrm __P((int));
68: static void tstop __P((int));
1.1 downsj 69: #ifdef SIGWINCH
1.2 downsj 70: static void winch __P((int));
1.1 downsj 71: #endif
72:
1.2 downsj 73: static void reset_display __P((void));
1.1 downsj 74:
75: /* values which need to be accessed by signal handlers */
76: static int max_topn; /* maximum displayable processes */
77:
78: /* miscellaneous things */
79: char *myname = "top";
80: jmp_buf jmp_int;
81:
82: /* routines that don't return int */
83:
84: #ifdef ORDER
85: extern int (*proc_compares[])();
86: #else
87: extern int proc_compare();
88: #endif
89: time_t time();
90:
91: caddr_t get_process_info();
92:
93: /* pointers to display routines */
1.2 downsj 94: void (*d_loadave)() = i_loadave;
95: void (*d_procstates)() = i_procstates;
96: void (*d_cpustates)() = i_cpustates;
97: void (*d_memory)() = i_memory;
98: void (*d_message)() = i_message;
99: void (*d_header)() = i_header;
100: void (*d_process)() = i_process;
1.1 downsj 101:
102:
1.2 downsj 103: int main(argc, argv)
1.1 downsj 104:
105: int argc;
106: char *argv[];
107:
108: {
109: register int i;
110: register int active_procs;
111: register int change;
112:
113: struct system_info system_info;
114: struct statics statics;
115: caddr_t processes;
116:
117: static char tempbuf1[50];
118: static char tempbuf2[50];
119: int old_sigmask; /* only used for BSD-style signals */
120: int topn = Default_TOPN;
121: int delay = Default_DELAY;
122: int displays = 0; /* indicates unspecified */
123: time_t curr_time;
124: char *(*get_userid)() = username;
125: char *uname_field = "USERNAME";
126: char *header_text;
127: char *env_top;
128: char **preset_argv;
129: int preset_argc = 0;
130: char **av;
131: int ac;
132: char dostates = No;
133: char do_unames = Yes;
134: char interactive = Maybe;
135: char warnings = 0;
136: #if Default_TOPN == Infinity
137: char topn_specified = No;
138: #endif
139: char ch;
140: char *iptr;
141: char no_command = 1;
142: struct timeval timeout;
143: struct process_select ps;
144: #ifdef ORDER
145: char *order_name = NULL;
146: int order_index = 0;
147: #endif
148: #ifndef FD_SET
149: /* FD_SET and friends are not present: fake it */
150: typedef int fd_set;
151: #define FD_ZERO(x) (*(x) = 0)
152: #define FD_SET(f, x) (*(x) = f)
153: #endif
154: fd_set readfds;
155:
156: #ifdef ORDER
157: static char command_chars[] = "\f qh?en#sdkriIuo";
158: #else
159: static char command_chars[] = "\f qh?en#sdkriIu";
160: #endif
161: /* these defines enumerate the "strchr"s of the commands in command_chars */
162: #define CMD_redraw 0
163: #define CMD_update 1
164: #define CMD_quit 2
165: #define CMD_help1 3
166: #define CMD_help2 4
167: #define CMD_OSLIMIT 4 /* terminals with OS can only handle commands */
168: #define CMD_errors 5 /* less than or equal to CMD_OSLIMIT */
169: #define CMD_number1 6
170: #define CMD_number2 7
171: #define CMD_delay 8
172: #define CMD_displays 9
173: #define CMD_kill 10
174: #define CMD_renice 11
175: #define CMD_idletog 12
176: #define CMD_idletog2 13
177: #define CMD_user 14
178: #ifdef ORDER
179: #define CMD_order 15
180: #endif
181:
182: /* set the buffer for stdout */
183: #ifdef DEBUG
184: setbuffer(stdout, NULL, 0);
185: #else
186: setbuffer(stdout, stdoutbuf, Buffersize);
187: #endif
188:
189: /* get our name */
190: if (argc > 0)
191: {
192: if ((myname = strrchr(argv[0], '/')) == 0)
193: {
194: myname = argv[0];
195: }
196: else
197: {
198: myname++;
199: }
200: }
201:
202: /* initialize some selection options */
203: ps.idle = Yes;
204: ps.system = No;
205: ps.uid = -1;
206: ps.command = NULL;
207:
208: /* get preset options from the environment */
209: if ((env_top = getenv("TOP")) != NULL)
210: {
211: av = preset_argv = argparse(env_top, &preset_argc);
212: ac = preset_argc;
213:
214: /* set the dummy argument to an explanatory message, in case
215: getopt encounters a bad argument */
216: preset_argv[0] = "while processing environment";
217: }
218:
219: /* process options */
220: do {
221: /* if we're done doing the presets, then process the real arguments */
222: if (preset_argc == 0)
223: {
224: ac = argc;
225: av = argv;
226:
227: /* this should keep getopt happy... */
228: optind = 1;
229: }
230:
1.3 aaron 231: while ((i = getopt(ac, av, "SIbinqus:d:U:o:")) != -1)
1.1 downsj 232: {
233: switch(i)
234: {
235: case 'u': /* toggle uid/username display */
236: do_unames = !do_unames;
237: break;
238:
239: case 'U': /* display only username's processes */
240: if ((ps.uid = userid(optarg)) == -1)
241: {
242: fprintf(stderr, "%s: unknown user\n", optarg);
243: exit(1);
244: }
245: break;
246:
247: case 'S': /* show system processes */
248: ps.system = !ps.system;
249: break;
250:
251: case 'I': /* show idle processes */
252: ps.idle = !ps.idle;
253: break;
254:
255: case 'i': /* go interactive regardless */
256: interactive = Yes;
257: break;
258:
259: case 'n': /* batch, or non-interactive */
260: case 'b':
261: interactive = No;
262: break;
263:
264: case 'd': /* number of displays to show */
265: if ((i = atoiwi(optarg)) == Invalid || i == 0)
266: {
267: fprintf(stderr,
268: "%s: warning: display count should be positive -- option ignored\n",
269: myname);
270: warnings++;
271: }
272: else
273: {
274: displays = i;
275: }
276: break;
277:
278: case 's':
279: {
1.6 ! deraadt 280: char *endp;
! 281:
! 282: delay = strtoul(optarg, &endp, 10);
! 283: if (delay < 0 || *endp != '\0')
! 284: {
1.1 downsj 285: fprintf(stderr,
286: "%s: warning: seconds delay should be non-negative -- using default\n",
287: myname);
288: delay = Default_DELAY;
289: warnings++;
1.6 ! deraadt 290: }
1.1 downsj 291: }
292: break;
293:
294: case 'q': /* be quick about it */
295: /* only allow this if user is really root */
296: if (getuid() == 0)
297: {
298: /* be very un-nice! */
299: (void) nice(-20);
300: }
301: else
302: {
303: fprintf(stderr,
304: "%s: warning: `-q' option can only be used by root\n",
305: myname);
306: warnings++;
307: }
308: break;
309:
310: case 'o': /* select sort order */
311: #ifdef ORDER
312: order_name = optarg;
313: #else
314: fprintf(stderr,
315: "%s: this platform does not support arbitrary ordering. Sorry.\n",
316: myname);
317: warnings++;
318: #endif
319: break;
320:
321: default:
322: fprintf(stderr, "\
323: Top version %s\n\
324: Usage: %s [-ISbinqu] [-d x] [-s x] [-o field] [-U username] [number]\n",
325: version_string(), myname);
326: exit(1);
327: }
328: }
329:
330: /* get count of top processes to display (if any) */
331: if (optind < ac)
332: {
333: if ((topn = atoiwi(av[optind])) == Invalid)
334: {
335: fprintf(stderr,
336: "%s: warning: process display count should be non-negative -- using default\n",
337: myname);
338: warnings++;
339: }
340: #if Default_TOPN == Infinity
341: else
342: {
343: topn_specified = Yes;
344: }
345: #endif
346: }
347:
348: /* tricky: remember old value of preset_argc & set preset_argc = 0 */
349: i = preset_argc;
350: preset_argc = 0;
351:
352: /* repeat only if we really did the preset arguments */
353: } while (i != 0);
354:
355: /* set constants for username/uid display correctly */
356: if (!do_unames)
357: {
358: uname_field = " UID ";
359: get_userid = itoa7;
360: }
361:
362: /* initialize the kernel memory interface */
363: if (machine_init(&statics) == -1)
364: {
365: exit(1);
366: }
367:
368: #ifdef ORDER
369: /* determine sorting order index, if necessary */
370: if (order_name != NULL)
371: {
372: if ((order_index = string_index(order_name, statics.order_names)) == -1)
373: {
374: char **pp;
375:
376: fprintf(stderr, "%s: '%s' is not a recognized sorting order.\n",
377: myname, order_name);
378: fprintf(stderr, "\tTry one of these:");
379: pp = statics.order_names;
380: while (*pp != NULL)
381: {
382: fprintf(stderr, " %s", *pp++);
383: }
384: fputc('\n', stderr);
385: exit(1);
386: }
387: }
388: #endif
389:
390: #ifdef no_initialization_needed
391: /* initialize the hashing stuff */
392: if (do_unames)
393: {
394: init_hash();
395: }
396: #endif
397:
398: /* initialize termcap */
399: init_termcap(interactive);
400:
401: /* get the string to use for the process area header */
402: header_text = format_header(uname_field);
403:
404: /* initialize display interface */
405: if ((max_topn = display_init(&statics)) == -1)
406: {
407: fprintf(stderr, "%s: can't allocate sufficient memory\n", myname);
408: exit(4);
409: }
410:
411: /* print warning if user requested more processes than we can display */
412: if (topn > max_topn)
413: {
414: fprintf(stderr,
415: "%s: warning: this terminal can only display %d processes.\n",
416: myname, max_topn);
417: warnings++;
418: }
419:
420: /* adjust for topn == Infinity */
421: if (topn == Infinity)
422: {
423: /*
424: * For smart terminals, infinity really means everything that can
425: * be displayed, or Largest.
426: * On dumb terminals, infinity means every process in the system!
427: * We only really want to do that if it was explicitly specified.
428: * This is always the case when "Default_TOPN != Infinity". But if
429: * topn wasn't explicitly specified and we are on a dumb terminal
430: * and the default is Infinity, then (and only then) we use
431: * "Nominal_TOPN" instead.
432: */
433: #if Default_TOPN == Infinity
434: topn = smart_terminal ? Largest :
435: (topn_specified ? Largest : Nominal_TOPN);
436: #else
437: topn = Largest;
438: #endif
439: }
440:
441: /* set header display accordingly */
442: display_header(topn > 0);
443:
444: /* determine interactive state */
445: if (interactive == Maybe)
446: {
447: interactive = smart_terminal;
448: }
449:
450: /* if # of displays not specified, fill it in */
451: if (displays == 0)
452: {
453: displays = smart_terminal ? Infinity : 1;
454: }
455:
456: /* hold interrupt signals while setting up the screen and the handlers */
457: #ifdef SIGHOLD
458: sighold(SIGINT);
459: sighold(SIGQUIT);
460: sighold(SIGTSTP);
461: #else
462: old_sigmask = sigblock(Smask(SIGINT) | Smask(SIGQUIT) | Smask(SIGTSTP));
463: #endif
464: init_screen();
465: (void) signal(SIGINT, leave);
466: (void) signal(SIGQUIT, leave);
467: (void) signal(SIGTSTP, tstop);
468: #ifdef SIGWINCH
469: (void) signal(SIGWINCH, winch);
470: #endif
471: #ifdef SIGRELSE
472: sigrelse(SIGINT);
473: sigrelse(SIGQUIT);
474: sigrelse(SIGTSTP);
475: #else
476: (void) sigsetmask(old_sigmask);
477: #endif
478: if (warnings)
479: {
480: fputs("....", stderr);
481: fflush(stderr); /* why must I do this? */
482: sleep((unsigned)(3 * warnings));
483: fputc('\n', stderr);
484: }
485:
486: /* setup the jump buffer for stops */
487: if (setjmp(jmp_int) != 0)
488: {
489: /* control ends up here after an interrupt */
490: reset_display();
491: }
492:
493: /*
494: * main loop -- repeat while display count is positive or while it
495: * indicates infinity (by being -1)
496: */
497:
498: while ((displays == -1) || (displays-- > 0))
499: {
500: /* get the current stats */
501: get_system_info(&system_info);
502:
503: /* get the current set of processes */
504: processes =
505: get_process_info(&system_info,
506: &ps,
507: #ifdef ORDER
508: proc_compares[order_index]);
509: #else
510: proc_compare);
511: #endif
512:
513: /* display the load averages */
514: (*d_loadave)(system_info.last_pid,
515: system_info.load_avg);
516:
517: /* display the current time */
518: /* this method of getting the time SHOULD be fairly portable */
519: time(&curr_time);
520: i_timeofday(&curr_time);
521:
522: /* display process state breakdown */
523: (*d_procstates)(system_info.p_total,
524: system_info.procstates);
525:
526: /* display the cpu state percentage breakdown */
527: if (dostates) /* but not the first time */
528: {
529: (*d_cpustates)(system_info.cpustates);
530: }
531: else
532: {
533: /* we'll do it next time */
534: if (smart_terminal)
535: {
536: z_cpustates();
537: }
538: else
539: {
540: putchar('\n');
541: }
542: dostates = Yes;
543: }
544:
545: /* display memory stats */
546: (*d_memory)(system_info.memory);
547:
548: /* handle message area */
549: (*d_message)();
550:
551: /* update the header area */
552: (*d_header)(header_text);
553:
554: if (topn > 0)
555: {
556: /* determine number of processes to actually display */
557: /* this number will be the smallest of: active processes,
558: number user requested, number current screen accomodates */
559: active_procs = system_info.p_active;
560: if (active_procs > topn)
561: {
562: active_procs = topn;
563: }
564: if (active_procs > max_topn)
565: {
566: active_procs = max_topn;
567: }
568:
569: /* now show the top "n" processes. */
570: for (i = 0; i < active_procs; i++)
571: {
572: (*d_process)(i, format_next_process(processes, get_userid));
573: }
574: }
575: else
576: {
577: i = 0;
578: }
579:
580: /* do end-screen processing */
581: u_endscreen(i);
582:
583: /* now, flush the output buffer */
584: fflush(stdout);
585:
586: /* only do the rest if we have more displays to show */
587: if (displays)
588: {
589: /* switch out for new display on smart terminals */
590: if (smart_terminal)
591: {
592: if (overstrike)
593: {
594: reset_display();
595: }
596: else
597: {
598: d_loadave = u_loadave;
599: d_procstates = u_procstates;
600: d_cpustates = u_cpustates;
601: d_memory = u_memory;
602: d_message = u_message;
603: d_header = u_header;
604: d_process = u_process;
605: }
606: }
607:
608: no_command = Yes;
609: if (!interactive)
610: {
611: /* set up alarm */
612: (void) signal(SIGALRM, onalrm);
613: (void) alarm((unsigned)delay);
614:
615: /* wait for the rest of it .... */
616: pause();
617: }
618: else while (no_command)
619: {
620: /* assume valid command unless told otherwise */
621: no_command = No;
622:
623: /* set up arguments for select with timeout */
624: FD_ZERO(&readfds);
625: FD_SET(1, &readfds); /* for standard input */
626: timeout.tv_sec = delay;
627: timeout.tv_usec = 0;
628:
629: /* wait for either input or the end of the delay period */
630: if (select(32, &readfds, (fd_set *)NULL, (fd_set *)NULL, &timeout) > 0)
631: {
632: int newval;
633: char *errmsg;
634:
635: /* something to read -- clear the message area first */
636: clear_message();
637:
638: /* now read it and convert to command strchr */
639: /* (use "change" as a temporary to hold strchr) */
640: (void) read(0, &ch, 1);
641: if ((iptr = strchr(command_chars, ch)) == NULL)
642: {
643: /* illegal command */
644: new_message(MT_standout, " Command not understood");
645: putchar('\r');
646: no_command = Yes;
647: }
648: else
649: {
650: change = iptr - command_chars;
651: if (overstrike && change > CMD_OSLIMIT)
652: {
653: /* error */
654: new_message(MT_standout,
655: " Command cannot be handled by this terminal");
656: putchar('\r');
657: no_command = Yes;
658: }
659: else switch(change)
660: {
661: case CMD_redraw: /* redraw screen */
662: reset_display();
663: break;
664:
665: case CMD_update: /* merely update display */
666: /* is the load average high? */
667: if (system_info.load_avg[0] > LoadMax)
668: {
669: /* yes, go home for visual feedback */
670: go_home();
671: fflush(stdout);
672: }
673: break;
674:
675: case CMD_quit: /* quit */
676: quit(0);
677: /*NOTREACHED*/
678: break;
679:
680: case CMD_help1: /* help */
681: case CMD_help2:
682: reset_display();
683: clear();
684: show_help();
685: standout("Hit any key to continue: ");
686: fflush(stdout);
687: (void) read(0, &ch, 1);
688: break;
689:
690: case CMD_errors: /* show errors */
691: if (error_count() == 0)
692: {
693: new_message(MT_standout,
694: " Currently no errors to report.");
695: putchar('\r');
696: no_command = Yes;
697: }
698: else
699: {
700: reset_display();
701: clear();
702: show_errors();
703: standout("Hit any key to continue: ");
704: fflush(stdout);
705: (void) read(0, &ch, 1);
706: }
707: break;
708:
709: case CMD_number1: /* new number */
710: case CMD_number2:
711: new_message(MT_standout,
712: "Number of processes to show: ");
713: newval = readline(tempbuf1, 8, Yes);
714: if (newval > -1)
715: {
716: if (newval > max_topn)
717: {
718: new_message(MT_standout | MT_delayed,
719: " This terminal can only display %d processes.",
720: max_topn);
721: putchar('\r');
722: }
723:
724: if (newval == 0)
725: {
726: /* inhibit the header */
727: display_header(No);
728: }
729: else if (newval > topn && topn == 0)
730: {
731: /* redraw the header */
732: display_header(Yes);
733: d_header = i_header;
734: }
735: topn = newval;
736: }
737: break;
738:
739: case CMD_delay: /* new seconds delay */
740: new_message(MT_standout, "Seconds to delay: ");
741: if ((i = readline(tempbuf1, 8, Yes)) > -1)
742: {
743: delay = i;
744: }
745: clear_message();
746: break;
747:
748: case CMD_displays: /* change display count */
749: new_message(MT_standout,
750: "Displays to show (currently %s): ",
751: displays == -1 ? "infinite" :
752: itoa(displays));
753: if ((i = readline(tempbuf1, 10, Yes)) > 0)
754: {
755: displays = i;
756: }
757: else if (i == 0)
758: {
759: quit(0);
760: }
761: clear_message();
762: break;
763:
764: case CMD_kill: /* kill program */
765: new_message(0, "kill ");
766: if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
767: {
768: if ((errmsg = kill_procs(tempbuf2)) != NULL)
769: {
1.4 millert 770: new_message(MT_standout, "%s", errmsg);
1.1 downsj 771: putchar('\r');
772: no_command = Yes;
773: }
774: }
775: else
776: {
777: clear_message();
778: }
779: break;
780:
781: case CMD_renice: /* renice program */
782: new_message(0, "renice ");
783: if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
784: {
785: if ((errmsg = renice_procs(tempbuf2)) != NULL)
786: {
1.4 millert 787: new_message(MT_standout, "%s", errmsg);
1.1 downsj 788: putchar('\r');
789: no_command = Yes;
790: }
791: }
792: else
793: {
794: clear_message();
795: }
796: break;
797:
798: case CMD_idletog:
799: case CMD_idletog2:
800: ps.idle = !ps.idle;
801: new_message(MT_standout | MT_delayed,
802: " %sisplaying idle processes.",
803: ps.idle ? "D" : "Not d");
804: putchar('\r');
805: break;
806:
807: case CMD_user:
808: new_message(MT_standout,
809: "Username to show: ");
810: if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
811: {
812: if (tempbuf2[0] == '+' &&
813: tempbuf2[1] == '\0')
814: {
815: ps.uid = -1;
816: }
817: else if ((i = userid(tempbuf2)) == -1)
818: {
819: new_message(MT_standout,
820: " %s: unknown user", tempbuf2);
821: no_command = Yes;
822: }
823: else
824: {
825: ps.uid = i;
826: }
827: putchar('\r');
828: }
829: else
830: {
831: clear_message();
832: }
833: break;
834:
835: #ifdef ORDER
836: case CMD_order:
837: new_message(MT_standout,
838: "Order to sort: ");
839: if (readline(tempbuf2, sizeof(tempbuf2), No) > 0)
840: {
841: if ((i = string_index(tempbuf2, statics.order_names)) == -1)
842: {
843: new_message(MT_standout,
844: " %s: unrecognized sorting order", tempbuf2);
845: no_command = Yes;
846: }
847: else
848: {
849: order_index = i;
850: }
851: putchar('\r');
852: }
853: else
854: {
855: clear_message();
856: }
857: break;
858: #endif
859:
860: default:
861: new_message(MT_standout, " BAD CASE IN SWITCH!");
862: putchar('\r');
863: }
864: }
865:
866: /* flush out stuff that may have been written */
867: fflush(stdout);
868: }
869: }
870: }
871: }
872:
873: quit(0);
874: /*NOTREACHED*/
875: }
876:
877: /*
878: * reset_display() - reset all the display routine pointers so that entire
879: * screen will get redrawn.
880: */
881:
1.2 downsj 882: static void reset_display()
1.1 downsj 883:
884: {
885: d_loadave = i_loadave;
886: d_procstates = i_procstates;
887: d_cpustates = i_cpustates;
888: d_memory = i_memory;
889: d_message = i_message;
890: d_header = i_header;
891: d_process = i_process;
892: }
893:
894: /*
895: * signal handlers
896: */
897:
1.2 downsj 898: void leave(unused) /* exit under normal conditions -- INT handler */
899:
900: int unused;
1.1 downsj 901:
902: {
903: end_screen();
904: exit(0);
905: }
906:
1.2 downsj 907: void tstop(i) /* SIGTSTP handler */
1.1 downsj 908:
909: int i;
910:
911: {
1.5 deraadt 912: int save_errno = errno;
913:
1.1 downsj 914: /* move to the lower left */
915: end_screen();
916: fflush(stdout);
917:
918: /* default the signal handler action */
919: (void) signal(SIGTSTP, SIG_DFL);
920:
921: /* unblock the signal and send ourselves one */
922: #ifdef SIGRELSE
923: sigrelse(SIGTSTP);
924: #else
925: (void) sigsetmask(sigblock(0) & ~(1 << (SIGTSTP - 1)));
926: #endif
927: (void) kill(0, SIGTSTP);
928:
929: /* reset the signal handler */
930: (void) signal(SIGTSTP, tstop);
931:
932: /* reinit screen */
933: reinit_screen();
934:
1.5 deraadt 935: errno = save_errno;
936:
1.1 downsj 937: /* jump to appropriate place */
938: longjmp(jmp_int, 1);
939:
940: /*NOTREACHED*/
941: }
942:
943: #ifdef SIGWINCH
1.2 downsj 944: void winch(i) /* SIGWINCH handler */
1.1 downsj 945:
946: int i;
947:
948: {
1.5 deraadt 949: int save_errno = errno;
950:
1.1 downsj 951: /* reascertain the screen dimensions */
952: get_screensize();
953:
954: /* tell display to resize */
955: max_topn = display_resize();
956:
957: /* reset the signal handler */
958: (void) signal(SIGWINCH, winch);
1.5 deraadt 959:
960: errno = save_errno;
1.1 downsj 961:
962: /* jump to appropriate place */
963: longjmp(jmp_int, 1);
964: }
965: #endif
966:
967: void quit(status) /* exit under duress */
968:
969: int status;
970:
971: {
972: end_screen();
973: exit(status);
974: /*NOTREACHED*/
975: }
976:
1.2 downsj 977: void onalrm(unused) /* SIGALRM handler */
978:
979: int unused;
1.1 downsj 980:
981: {
982: /* this is only used in batch mode to break out of the pause() */
983: /* return; */
984: }
985: