1: /*
2: * tickadj - read, and possibly modify, the kernel `tick' and
3: * `tickadj' variables, as well as `dosynctodr'. Note that
4: * this operates on the running kernel only. I'd like to be
5: * able to read and write the binary as well, but haven't
6: * mastered this yet.
7: *
8: * HMS: The #includes here are different from those in xntpd/ntp_unixclock.c
9: * These seem "worse".
10: */
11:
12: #ifdef HAVE_CONFIG_H
13: # include <config.h>
14: #endif
15:
16: #include "ntp_types.h"
17: #include "l_stdlib.h"
18:
19: #include <stdio.h>
20: #ifdef HAVE_UNISTD_H
21: # include <unistd.h>
22: #endif /* HAVE_UNISTD_H */
23:
24: #ifdef HAVE___ADJTIMEX /* Linux */
25:
26: #include <sys/timex.h>
27: struct timex txc;
28:
29: #if 0
30: int
31: main(
32: int argc,
33: char *argv[]
34: )
35: {
36: int c, i;
37: int quiet = 0;
38: int errflg = 0;
39: char *progname;
40: extern int ntp_optind;
41: extern char *ntp_optarg;
42:
43: progname = argv[0];
44: if (argc==2 && argv[1][0] != '-') { /* old Linux format, for compatability */
45: if ((i = atoi(argv[1])) > 0) {
46: txc.time_tick = i;
47: txc.modes = ADJ_TIMETICK;
48: } else {
49: fprintf(stderr, "Silly value for tick: %s\n", argv[1]);
50: errflg++;
51: }
52: } else {
53: while ((c = ntp_getopt(argc, argv, "a:qt:")) != EOF) {
54: switch (c) {
55: case 'a':
56: if ((i=atoi(ntp_optarg)) > 0) {
57: txc.tickadj = i;
58: txc.modes |= ADJ_TICKADJ;
59: } else {
60: (void) fprintf(stderr,
61: "%s: unlikely value for tickadj: %s\n",
62: progname, ntp_optarg);
63: errflg++;
64: }
65: break;
66:
67: case 'q':
68: quiet = 1;
69: break;
70:
71: case 't':
72: if ((i=atoi(ntp_optarg)) > 0) {
73: txc.time_tick = i;
74: txc.modes |= ADJ_TIMETICK;
75: } else {
76: (void) fprintf(stderr,
77: "%s: unlikely value for tick: %s\n",
78: progname, ntp_optarg);
79: errflg++;
80: }
81: break;
82:
83: default:
84: fprintf(stderr,
85: "Usage: %s [tick_value]\n-or- %s [ -q ] [ -t tick ] [ -a tickadj ]\n",
86: progname, progname);
87: errflg++;
88: break;
89: }
90: }
91: }
92:
93: if (!errflg) {
94: if (__adjtimex(&txc) < 0)
95: perror("adjtimex");
96: else if (!quiet)
97: printf("tick = %ld\ntick_adj = %d\n",
98: txc.time_tick, txc.tickadj);
99: }
100:
101: exit(errflg ? 1 : 0);
102: }
103: #else
104: int
105: main(
106: int argc,
107: char *argv[]
108: )
109: {
110: if (argc > 2)
111: {
112: fprintf(stderr, "Usage: %s [tick_value]\n", argv[0]);
113: exit(-1);
114: }
115: else if (argc == 2)
116: {
117: #ifdef ADJ_TIMETICK
118: if ( (txc.time_tick = atoi(argv[1])) < 1 )
119: #else
120: if ( (txc.tick = atoi(argv[1])) < 1 )
121: #endif
122: {
123: fprintf(stderr, "Silly value for tick: %s\n", argv[1]);
124: exit(-1);
125: }
126: #ifdef ADJ_TIMETICK
127: txc.modes = ADJ_TIMETICK;
128: #else
129: #ifdef MOD_OFFSET
130: txc.modes = ADJ_TICK;
131: #else
132: txc.mode = ADJ_TICK;
133: #endif
134: #endif
135: }
136: else
137: {
138: #ifdef ADJ_TIMETICK
139: txc.modes = 0;
140: #else
141: #ifdef MOD_OFFSET
142: txc.modes = 0;
143: #else
144: txc.mode = 0;
145: #endif
146: #endif
147: }
148:
149: if (__adjtimex(&txc) < 0)
150: {
151: perror("adjtimex");
152: }
153: else
154: {
155: #ifdef ADJ_TIMETICK
156: printf("tick = %ld\ntick_adj = %ld\n", txc.time_tick, txc.tickadj);
157: #else
158: printf("tick = %ld\n", txc.tick);
159: #endif
160: }
161:
162: exit(0);
163: }
164: #endif
165:
166: #else /* not Linux... kmem tweaking: */
167:
168: #ifdef HAVE_SYS_FILE_H
169: # include <sys/file.h>
170: #endif
171: #include <sys/stat.h>
172:
173: #ifdef HAVE_SYS_PARAM_H
174: # include <sys/param.h>
175: #endif
176:
177: #ifdef NLIST_STRUCT
178: # include <nlist.h>
179: #else /* not NLIST_STRUCT */ /* was defined(SYS_AUX3) || defined(SYS_AUX2) */
180: # include <sys/resource.h>
181: # include <sys/file.h>
182: # include <a.out.h>
183: # ifdef HAVE_SYS_VAR_H
184: # include <sys/var.h>
185: # endif
186: #endif
187:
188: #include "ntp_stdlib.h"
189: #include "ntp_io.h"
190:
191: #ifdef hz /* Was: RS6000 */
192: # undef hz
193: #endif /* hz */
194:
195: #ifdef HAVE_KVM_OPEN
196: # include <kvm.h>
197: #endif
198:
199: #ifdef SYS_VXWORKS
200: /* vxWorks needs mode flag -casey*/
201: #define open(name, flags) open(name, flags, 0777)
202: #endif
203:
204: #ifndef L_SET /* Was: defined(SYS_PTX) || defined(SYS_IX86OSF1) */
205: # define L_SET SEEK_SET
206: #endif
207:
208: #ifndef HZ
209: # define HZ DEFAULT_HZ
210: #endif
211:
212: #define KMEM "/dev/kmem"
213: #define STREQ(a, b) (*(a) == *(b) && strcmp((a), (b)) == 0)
214:
215: char *progname;
216: volatile int debug;
217:
218: int dokmem = 1;
219: int writetickadj = 0;
220: int writeopttickadj = 0;
221: int unsetdosync = 0;
222: int writetick = 0;
223: int quiet = 0;
224: int setnoprintf = 0;
225:
226: const char *kmem = KMEM;
227: const char *file = NULL;
228: int fd = -1;
229:
230: static void getoffsets (off_t *, off_t *, off_t *, off_t *);
231: static int openfile (const char *, int);
232: static void writevar (int, off_t, int);
233: static void readvar (int, off_t, int *);
234:
235: /*
236: * main - parse arguments and handle options
237: */
238: int
239: main(
240: int argc,
241: char *argv[]
242: )
243: {
244: int c;
245: int errflg = 0;
246: off_t tickadj_offset;
247: off_t tick_offset;
248: off_t dosync_offset;
249: off_t noprintf_offset;
250: int tickadj, ktickadj; /* HMS: Why isn't this u_long? */
251: int tick, ktick; /* HMS: Why isn't this u_long? */
252: int dosynctodr;
253: int noprintf;
254: int hz;
255: int hz_int, hz_hundredths;
256: int recommend_tickadj;
257: long tmp;
258:
259: progname = argv[0];
260: while ((c = ntp_getopt(argc, argv, "a:Adkpqst:")) != EOF)
261: {
262: switch (c)
263: {
264: case 'a':
265: writetickadj = atoi(ntp_optarg);
266: if (writetickadj <= 0)
267: {
268: (void) fprintf(stderr,
269: "%s: unlikely value for tickadj: %s\n",
270: progname, ntp_optarg);
271: errflg++;
272: }
273:
274: #if defined SCO5_CLOCK
275: if (writetickadj % HZ)
276: {
277: writetickadj = (writetickadj / HZ) * HZ;
278: (void) fprintf(stderr,
279: "tickadj truncated to: %d\n", writetickadj);
280: }
281: #endif /* SCO5_CLOCK */
282:
283: break;
284: case 'A':
285: writeopttickadj = 1;
286: break;
287: case 'd':
288: ++debug;
289: break;
290: case 'k':
291: dokmem = 1;
292: break;
293: case 'p':
294: setnoprintf = 1;
295: break;
296: case 'q':
297: quiet = 1;
298: break;
299: case 's':
300: unsetdosync = 1;
301: break;
302: case 't':
303: writetick = atoi(ntp_optarg);
304: if (writetick <= 0)
305: {
306: (void) fprintf(stderr,
307: "%s: unlikely value for tick: %s\n",
308: progname, ntp_optarg);
309: errflg++;
310: }
311: break;
312: default:
313: errflg++;
314: break;
315: }
316: }
317: if (errflg || ntp_optind != argc)
318: {
319: (void) fprintf(stderr,
320: "usage: %s [-Adkpqs] [-a newadj] [-t newtick]\n", progname);
321: exit(2);
322: }
323:
324: getoffsets(&tick_offset, &tickadj_offset, &dosync_offset, &noprintf_offset);
325:
326: if (debug)
327: {
328: (void) printf("tick offset = %lu\n", (unsigned long)tick_offset);
329: (void) printf("tickadj offset = %lu\n", (unsigned long)tickadj_offset);
330: (void) printf("dosynctodr offset = %lu\n", (unsigned long)dosync_offset);
331: (void) printf("noprintf offset = %lu\n", (unsigned long)noprintf_offset);
332: }
333:
334: if (writetick && (tick_offset == 0))
335: {
336: (void) fprintf(stderr,
337: "No tick kernel variable\n");
338: errflg++;
339: }
340:
341: if (writeopttickadj && (tickadj_offset == 0))
342: {
343: (void) fprintf(stderr,
344: "No tickadj kernel variable\n");
345: errflg++;
346: }
347:
348: if (unsetdosync && (dosync_offset == 0))
349: {
350: (void) fprintf(stderr,
351: "No dosynctodr kernel variable\n");
352: errflg++;
353: }
354:
355: if (setnoprintf && (noprintf_offset == 0))
356: {
357: (void) fprintf(stderr,
358: "No noprintf kernel variable\n");
359: errflg++;
360: }
361:
362: if (tick_offset != 0)
363: {
364: readvar(fd, tick_offset, &tick);
365: #if defined(TICK_NANO) && defined(K_TICK_NAME)
366: if (!quiet)
367: (void) printf("KERNEL %s = %d nsec\n", K_TICK_NAME, tick);
368: #endif /* TICK_NANO && K_TICK_NAME */
369:
370: #ifdef TICK_NANO
371: tick /= 1000;
372: #endif
373: }
374: else
375: {
376: tick = 0;
377: }
378:
379: if (tickadj_offset != 0)
380: {
381: readvar(fd, tickadj_offset, &tickadj);
382:
383: #ifdef SCO5_CLOCK
384: /* scale from nsec/sec to usec/tick */
385: tickadj /= (1000L * HZ);
386: #endif /*SCO5_CLOCK */
387:
388: #if defined(TICKADJ_NANO) && defined(K_TICKADJ_NAME)
389: if (!quiet)
390: (void) printf("KERNEL %s = %d nsec\n", K_TICKADJ_NAME, tickadj);
391: #endif /* TICKADJ_NANO && K_TICKADJ_NAME */
392:
393: #ifdef TICKADJ_NANO
394: tickadj += 999;
395: tickadj /= 1000;
396: #endif
397: }
398: else
399: {
400: tickadj = 0;
401: }
402:
403: if (dosync_offset != 0)
404: {
405: readvar(fd, dosync_offset, &dosynctodr);
406: }
407:
408: if (noprintf_offset != 0)
409: {
410: readvar(fd, noprintf_offset, &noprintf);
411: }
412:
413: (void) close(fd);
414:
415: if (unsetdosync && dosync_offset == 0)
416: {
417: (void) fprintf(stderr,
418: "%s: can't find %s in namelist\n",
419: progname,
420: #ifdef K_DOSYNCTODR_NAME
421: K_DOSYNCTODR_NAME
422: #else /* not K_DOSYNCTODR_NAME */
423: "dosynctodr"
424: #endif /* not K_DOSYNCTODR_NAME */
425: );
426: exit(1);
427: }
428:
429: hz = HZ;
430: #if defined(HAVE_SYSCONF) && defined(_SC_CLK_TCK)
431: hz = (int) sysconf (_SC_CLK_TCK);
432: #endif /* not HAVE_SYSCONF && _SC_CLK_TCK */
433: #ifdef OVERRIDE_HZ
434: hz = DEFAULT_HZ;
435: #endif
436: ktick = tick;
437: #ifdef PRESET_TICK
438: tick = PRESET_TICK;
439: #endif /* PRESET_TICK */
440: #ifdef TICKADJ_NANO
441: tickadj /= 1000;
442: if (tickadj == 0)
443: tickadj = 1;
444: #endif
445: ktickadj = tickadj;
446: #ifdef PRESET_TICKADJ
447: tickadj = (PRESET_TICKADJ) ? PRESET_TICKADJ : 1;
448: #endif /* PRESET_TICKADJ */
449:
450: if (!quiet)
451: {
452: if (tick_offset != 0)
453: {
454: (void) printf("KERNEL tick = %d usec (from %s kernel variable)\n",
455: ktick,
456: #ifdef K_TICK_NAME
457: K_TICK_NAME
458: #else
459: "<this can't happen>"
460: #endif
461: );
462: }
463: #ifdef PRESET_TICK
464: (void) printf("PRESET tick = %d usec\n", tick);
465: #endif /* PRESET_TICK */
466: if (tickadj_offset != 0)
467: {
468: (void) printf("KERNEL tickadj = %d usec (from %s kernel variable)\n",
469: ktickadj,
470: #ifdef K_TICKADJ_NAME
471: K_TICKADJ_NAME
472: #else
473: "<this can't happen>"
474: #endif
475: );
476: }
477: #ifdef PRESET_TICKADJ
478: (void) printf("PRESET tickadj = %d usec\n", tickadj);
479: #endif /* PRESET_TICKADJ */
480: if (dosync_offset != 0)
481: {
482: (void) printf("dosynctodr is %s\n", dosynctodr ? "on" : "off");
483: }
484: if (noprintf_offset != 0)
485: {
486: (void) printf("kernel level printf's: %s\n",
487: noprintf ? "off" : "on");
488: }
489: }
490:
491: if (tick <= 0)
492: {
493: (void) fprintf(stderr, "%s: the value of tick is silly!\n",
494: progname);
495: exit(1);
496: }
497:
498: hz_int = (int)(1000000L / (long)tick);
499: hz_hundredths = (int)((100000000L / (long)tick) - ((long)hz_int * 100L));
500: if (!quiet)
501: {
502: (void) printf("KERNEL hz = %d\n", hz);
503: (void) printf("calculated hz = %d.%02d Hz\n", hz_int,
504: hz_hundredths);
505: }
506:
507: #if defined SCO5_CLOCK
508: recommend_tickadj = 100;
509: #else /* SCO5_CLOCK */
510: tmp = (long) tick * 500L;
511: recommend_tickadj = (int)(tmp / 1000000L);
512: if (tmp % 1000000L > 0)
513: {
514: recommend_tickadj++;
515: }
516:
517: #ifdef MIN_REC_TICKADJ
518: if (recommend_tickadj < MIN_REC_TICKADJ)
519: {
520: recommend_tickadj = MIN_REC_TICKADJ;
521: }
522: #endif /* MIN_REC_TICKADJ */
523: #endif /* SCO5_CLOCK */
524:
525:
526: if ((!quiet) && (tickadj_offset != 0))
527: {
528: (void) printf("recommended value of tickadj = %d us\n",
529: recommend_tickadj);
530: }
531:
532: if ( writetickadj == 0
533: && !writeopttickadj
534: && !unsetdosync
535: && writetick == 0
536: && !setnoprintf)
537: {
538: exit(errflg ? 1 : 0);
539: }
540:
541: if (writetickadj == 0 && writeopttickadj)
542: {
543: writetickadj = recommend_tickadj;
544: }
545:
546: fd = openfile(file, O_WRONLY);
547:
548: if (setnoprintf && (noprintf_offset != 0))
549: {
550: if (!quiet)
551: {
552: (void) fprintf(stderr, "setting noprintf: ");
553: (void) fflush(stderr);
554: }
555: writevar(fd, noprintf_offset, 1);
556: if (!quiet)
557: {
558: (void) fprintf(stderr, "done!\n");
559: }
560: }
561:
562: if ((writetick > 0) && (tick_offset != 0))
563: {
564: if (!quiet)
565: {
566: (void) fprintf(stderr, "writing tick, value %d: ",
567: writetick);
568: (void) fflush(stderr);
569: }
570: writevar(fd, tick_offset, writetick);
571: if (!quiet)
572: {
573: (void) fprintf(stderr, "done!\n");
574: }
575: }
576:
577: if ((writetickadj > 0) && (tickadj_offset != 0))
578: {
579: if (!quiet)
580: {
581: (void) fprintf(stderr, "writing tickadj, value %d: ",
582: writetickadj);
583: (void) fflush(stderr);
584: }
585:
586: #ifdef SCO5_CLOCK
587: /* scale from usec/tick to nsec/sec */
588: writetickadj *= (1000L * HZ);
589: #endif /* SCO5_CLOCK */
590:
591: writevar(fd, tickadj_offset, writetickadj);
592: if (!quiet)
593: {
594: (void) fprintf(stderr, "done!\n");
595: }
596: }
597:
598: if (unsetdosync && (dosync_offset != 0))
599: {
600: if (!quiet)
601: {
602: (void) fprintf(stderr, "zeroing dosynctodr: ");
603: (void) fflush(stderr);
604: }
605: writevar(fd, dosync_offset, 0);
606: if (!quiet)
607: {
608: (void) fprintf(stderr, "done!\n");
609: }
610: }
611: (void) close(fd);
612: return(errflg ? 1 : 0);
613: }
614:
615: /*
616: * getoffsets - read the magic offsets from the specified file
617: */
618: static void
619: getoffsets(
620: off_t *tick_off,
621: off_t *tickadj_off,
622: off_t *dosync_off,
623: off_t *noprintf_off
624: )
625: {
626:
627: #ifndef NOKMEM
628: # ifndef HAVE_KVM_OPEN
629: const char **kname;
630: # endif
631: #endif
632:
633: #ifndef NOKMEM
634: # ifdef NLIST_NAME_UNION
635: # define NL_B {{
636: # define NL_E }}
637: # else
638: # define NL_B {
639: # define NL_E }
640: # endif
641: #endif
642:
643: #define K_FILLER_NAME "DavidLetterman"
644:
645: #ifdef NLIST_EXTRA_INDIRECTION
646: int i;
647: #endif
648:
649: #ifndef NOKMEM
650: static struct nlist nl[] =
651: {
652: NL_B
653: #ifdef K_TICKADJ_NAME
654: #define N_TICKADJ 0
655: K_TICKADJ_NAME
656: #else
657: K_FILLER_NAME
658: #endif
659: NL_E,
660: NL_B
661: #ifdef K_TICK_NAME
662: #define N_TICK 1
663: K_TICK_NAME
664: #else
665: K_FILLER_NAME
666: #endif
667: NL_E,
668: NL_B
669: #ifdef K_DOSYNCTODR_NAME
670: #define N_DOSYNC 2
671: K_DOSYNCTODR_NAME
672: #else
673: K_FILLER_NAME
674: #endif
675: NL_E,
676: NL_B
677: #ifdef K_NOPRINTF_NAME
678: #define N_NOPRINTF 3
679: K_NOPRINTF_NAME
680: #else
681: K_FILLER_NAME
682: #endif
683: NL_E,
684: NL_B "" NL_E,
685: };
686:
687: #ifndef HAVE_KVM_OPEN
688: static const char *kernels[] =
689: {
690: #ifdef HAVE_GETBOOTFILE
691: NULL, /* *** SEE BELOW! *** */
692: #endif
693: "/kernel/unix",
694: "/kernel",
695: "/vmunix",
696: "/unix",
697: "/mach",
698: "/hp-ux",
699: "/386bsd",
700: "/netbsd",
701: "/stand/vmunix",
702: "/bsd",
703: NULL
704: };
705: #endif /* not HAVE_KVM_OPEN */
706:
707: #ifdef HAVE_KVM_OPEN
708: /*
709: * Solaris > 2.5 doesn't have a kernel file. Use the kvm_* interface
710: * to read the kernel name list. -- stolcke 3/4/96
711: */
712: kvm_t *kvm_handle = kvm_open(NULL, NULL, NULL, O_RDONLY, progname);
713:
714: if (kvm_handle == NULL)
715: {
716: (void) fprintf(stderr,
717: "%s: kvm_open failed\n",
718: progname);
719: exit(1);
720: }
721: if (kvm_nlist(kvm_handle, nl) == -1)
722: {
723: (void) fprintf(stderr,
724: "%s: kvm_nlist failed\n",
725: progname);
726: exit(1);
727: }
728: kvm_close(kvm_handle);
729: #else /* not HAVE_KVM_OPEN */
730: #ifdef HAVE_GETBOOTFILE /* *** SEE HERE! *** */
731: if (kernels[0] == NULL)
732: {
733: char * cp = (char *)getbootfile();
734:
735: if (cp)
736: {
737: kernels[0] = cp;
738: }
739: else
740: {
741: kernels[0] = "/Placeholder";
742: }
743: }
744: #endif /* HAVE_GETBOOTFILE */
745: for (kname = kernels; *kname != NULL; kname++)
746: {
747: struct stat stbuf;
748:
749: if (stat(*kname, &stbuf) == -1)
750: {
751: continue;
752: }
753: if (nlist(*kname, nl) >= 0)
754: {
755: break;
756: }
757: else
758: {
759: (void) fprintf(stderr,
760: "%s: nlist didn't find needed symbols from <%s>: %s\n",
761: progname, *kname, strerror(errno));
762: }
763: }
764: if (*kname == NULL)
765: {
766: (void) fprintf(stderr,
767: "%s: Couldn't find the kernel\n",
768: progname);
769: exit(1);
770: }
771: #endif /* HAVE_KVM_OPEN */
772:
773: if (dokmem)
774: {
775: file = kmem;
776:
777: fd = openfile(file, O_RDONLY);
778: #ifdef NLIST_EXTRA_INDIRECTION
779: /*
780: * Go one more round of indirection.
781: */
782: for (i = 0; i < (sizeof(nl) / sizeof(struct nlist)); i++)
783: {
784: if ((nl[i].n_value) && (nl[i].n_sclass == 0x6b))
785: {
786: readvar(fd, nl[i].n_value, &nl[i].n_value);
787: }
788: }
789: #endif /* NLIST_EXTRA_INDIRECTION */
790: }
791: #endif /* not NOKMEM */
792:
793: *tickadj_off = 0;
794: *tick_off = 0;
795: *dosync_off = 0;
796: *noprintf_off = 0;
797:
798: #if defined(N_TICKADJ)
799: *tickadj_off = nl[N_TICKADJ].n_value;
800: #endif
801:
802: #if defined(N_TICK)
803: *tick_off = nl[N_TICK].n_value;
804: #endif
805:
806: #if defined(N_DOSYNC)
807: *dosync_off = nl[N_DOSYNC].n_value;
808: #endif
809:
810: #if defined(N_NOPRINTF)
811: *noprintf_off = nl[N_NOPRINTF].n_value;
812: #endif
813: return;
814: }
815:
816: #undef N_TICKADJ
817: #undef N_TICK
818: #undef N_DOSYNC
819: #undef N_NOPRINTF
820:
821:
822: /*
823: * openfile - open the file, check for errors
824: */
825: static int
826: openfile(
827: const char *name,
828: int mode
829: )
830: {
831: int ifd;
832:
833: ifd = open(name, mode);
834: if (ifd < 0)
835: {
836: (void) fprintf(stderr, "%s: open %s: ", progname, name);
837: perror("");
838: exit(1);
839: }
840: return ifd;
841: }
842:
843:
844: /*
845: * writevar - write a variable into the file
846: */
847: static void
848: writevar(
849: int ofd,
850: off_t off,
851: int var
852: )
853: {
854:
855: if (lseek(ofd, off, L_SET) == -1)
856: {
857: (void) fprintf(stderr, "%s: lseek fails: ", progname);
858: perror("");
859: exit(1);
860: }
861: if (write(ofd, (char *)&var, sizeof(int)) != sizeof(int))
862: {
863: (void) fprintf(stderr, "%s: write fails: ", progname);
864: perror("");
865: exit(1);
866: }
867: return;
868: }
869:
870:
871: /*
872: * readvar - read a variable from the file
873: */
874: static void
875: readvar(
876: int ifd,
877: off_t off,
878: int *var
879: )
880: {
881: int i;
882:
883: if (lseek(ifd, off, L_SET) == -1)
884: {
885: (void) fprintf(stderr, "%s: lseek fails: ", progname);
886: perror("");
887: exit(1);
888: }
889: i = read(ifd, (char *)var, sizeof(int));
890: if (i < 0)
891: {
892: (void) fprintf(stderr, "%s: read fails: ", progname);
893: perror("");
894: exit(1);
895: }
896: if (i != sizeof(int))
897: {
898: (void) fprintf(stderr, "%s: read expected %d, got %d\n",
899: progname, (int)sizeof(int), i);
900: exit(1);
901: }
902: return;
903: }
904: #endif /* not Linux */
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