1 /*
2 * ifstat.c handy utility to read net interface statistics
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU General Public License
6 * as published by the Free Software Foundation; either version
7 * 2 of the License, or (at your option) any later version.
8 *
9 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
10 */
11
12 #include <stdio.h>
13 #include <stdlib.h>
14 #include <unistd.h>
15 #include <fcntl.h>
16 #include <string.h>
17 #include <errno.h>
18 #include <time.h>
19 #include <sys/time.h>
20 #include <fnmatch.h>
21 #include <sys/file.h>
22 #include <sys/socket.h>
23 #include <sys/un.h>
24 #include <sys/poll.h>
25 #include <sys/wait.h>
26 #include <sys/stat.h>
27 #include <signal.h>
28 #include <math.h>
29 #include <getopt.h>
30
31 #include <libnetlink.h>
32 #include <linux/if.h>
33 #include <linux/if_link.h>
34
35 #include <SNAPSHOT.h>
36
37 int dump_zeros = 0;
38 int reset_history = 0;
39 int ignore_history = 0;
40 int no_output = 0;
41 int no_update = 0;
42 int scan_interval = 0;
43 int time_constant = 0;
44 int show_errors = 0;
45 double W;
46 char **patterns;
47 int npatterns;
48
49 char info_source[128];
50 int source_mismatch;
51
52 #define MAXS (sizeof(struct rtnl_link_stats)/sizeof(__u32))
53
54 struct ifstat_ent
55 {
56 struct ifstat_ent *next;
57 char *name;
58 int ifindex;
59 unsigned long long val[MAXS];
60 double rate[MAXS];
61 __u32 ival[MAXS];
62 };
63
64 struct ifstat_ent *kern_db;
65 struct ifstat_ent *hist_db;
66
match(const char * id)67 static int match(const char *id)
68 {
69 int i;
70
71 if (npatterns == 0)
72 return 1;
73
74 for (i=0; i<npatterns; i++) {
75 if (!fnmatch(patterns[i], id, 0))
76 return 1;
77 }
78 return 0;
79 }
80
get_nlmsg(const struct sockaddr_nl * who,struct nlmsghdr * m,void * arg)81 static int get_nlmsg(const struct sockaddr_nl *who,
82 struct nlmsghdr *m, void *arg)
83 {
84 struct ifinfomsg *ifi = NLMSG_DATA(m);
85 struct rtattr * tb[IFLA_MAX+1];
86 int len = m->nlmsg_len;
87 struct ifstat_ent *n;
88 int i;
89
90 if (m->nlmsg_type != RTM_NEWLINK)
91 return 0;
92
93 len -= NLMSG_LENGTH(sizeof(*ifi));
94 if (len < 0)
95 return -1;
96
97 if (!(ifi->ifi_flags&IFF_UP))
98 return 0;
99
100 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
101 if (tb[IFLA_IFNAME] == NULL || tb[IFLA_STATS] == NULL)
102 return 0;
103
104 n = malloc(sizeof(*n));
105 if (!n)
106 abort();
107 n->ifindex = ifi->ifi_index;
108 n->name = strdup(RTA_DATA(tb[IFLA_IFNAME]));
109 memcpy(&n->ival, RTA_DATA(tb[IFLA_STATS]), sizeof(n->ival));
110 memset(&n->rate, 0, sizeof(n->rate));
111 for (i=0; i<MAXS; i++)
112 n->val[i] = n->ival[i];
113 n->next = kern_db;
114 kern_db = n;
115 return 0;
116 }
117
load_info(void)118 void load_info(void)
119 {
120 struct ifstat_ent *db, *n;
121 struct rtnl_handle rth;
122
123 if (rtnl_open(&rth, 0) < 0)
124 exit(1);
125
126 if (rtnl_wilddump_request(&rth, AF_INET, RTM_GETLINK) < 0) {
127 perror("Cannot send dump request");
128 exit(1);
129 }
130
131 if (rtnl_dump_filter(&rth, get_nlmsg, NULL) < 0) {
132 fprintf(stderr, "Dump terminated\n");
133 exit(1);
134 }
135
136 rtnl_close(&rth);
137
138 db = kern_db;
139 kern_db = NULL;
140
141 while (db) {
142 n = db;
143 db = db->next;
144 n->next = kern_db;
145 kern_db = n;
146 }
147 }
148
load_raw_table(FILE * fp)149 void load_raw_table(FILE *fp)
150 {
151 char buf[4096];
152 struct ifstat_ent *db = NULL;
153 struct ifstat_ent *n;
154
155 while (fgets(buf, sizeof(buf), fp) != NULL) {
156 char *p;
157 char *next;
158 int i;
159
160 if (buf[0] == '#') {
161 buf[strlen(buf)-1] = 0;
162 if (info_source[0] && strcmp(info_source, buf+1))
163 source_mismatch = 1;
164 strncpy(info_source, buf+1, sizeof(info_source)-1);
165 continue;
166 }
167 if ((n = malloc(sizeof(*n))) == NULL)
168 abort();
169
170 if (!(p = strchr(buf, ' ')))
171 abort();
172 *p++ = 0;
173
174 if (sscanf(buf, "%d", &n->ifindex) != 1)
175 abort();
176 if (!(next = strchr(p, ' ')))
177 abort();
178 *next++ = 0;
179
180 n->name = strdup(p);
181 p = next;
182
183 for (i=0; i<MAXS; i++) {
184 unsigned rate;
185 if (!(next = strchr(p, ' ')))
186 abort();
187 *next++ = 0;
188 if (sscanf(p, "%llu", n->val+i) != 1)
189 abort();
190 n->ival[i] = (__u32)n->val[i];
191 p = next;
192 if (!(next = strchr(p, ' ')))
193 abort();
194 *next++ = 0;
195 if (sscanf(p, "%u", &rate) != 1)
196 abort();
197 n->rate[i] = rate;
198 p = next;
199 }
200 n->next = db;
201 db = n;
202 }
203
204 while (db) {
205 n = db;
206 db = db->next;
207 n->next = kern_db;
208 kern_db = n;
209 }
210 }
211
dump_raw_db(FILE * fp,int to_hist)212 void dump_raw_db(FILE *fp, int to_hist)
213 {
214 struct ifstat_ent *n, *h;
215 h = hist_db;
216 fprintf(fp, "#%s\n", info_source);
217
218 for (n=kern_db; n; n=n->next) {
219 int i;
220 unsigned long long *vals = n->val;
221 double *rates = n->rate;
222 if (!match(n->name)) {
223 struct ifstat_ent *h1;
224 if (!to_hist)
225 continue;
226 for (h1 = h; h1; h1 = h1->next) {
227 if (h1->ifindex == n->ifindex) {
228 vals = h1->val;
229 rates = h1->rate;
230 h = h1->next;
231 break;
232 }
233 }
234 }
235 fprintf(fp, "%d %s ", n->ifindex, n->name);
236 for (i=0; i<MAXS; i++)
237 fprintf(fp, "%llu %u ", vals[i], (unsigned)rates[i]);
238 fprintf(fp, "\n");
239 }
240 }
241
242 /* use communication definitions of meg/kilo etc */
243 static const unsigned long long giga = 1000000000ull;
244 static const unsigned long long mega = 1000000;
245 static const unsigned long long kilo = 1000;
246
format_rate(FILE * fp,unsigned long long * vals,double * rates,int i)247 void format_rate(FILE *fp, unsigned long long *vals, double *rates, int i)
248 {
249 char temp[64];
250 if (vals[i] > giga)
251 fprintf(fp, "%7lluM ", vals[i]/mega);
252 else if (vals[i] > mega)
253 fprintf(fp, "%7lluK ", vals[i]/kilo);
254 else
255 fprintf(fp, "%8llu ", vals[i]);
256
257 if (rates[i] > mega) {
258 sprintf(temp, "%uM", (unsigned)(rates[i]/mega));
259 fprintf(fp, "%-6s ", temp);
260 } else if (rates[i] > kilo) {
261 sprintf(temp, "%uK", (unsigned)(rates[i]/kilo));
262 fprintf(fp, "%-6s ", temp);
263 } else
264 fprintf(fp, "%-6u ", (unsigned)rates[i]);
265 }
266
format_pair(FILE * fp,unsigned long long * vals,int i,int k)267 void format_pair(FILE *fp, unsigned long long *vals, int i, int k)
268 {
269 char temp[64];
270 if (vals[i] > giga)
271 fprintf(fp, "%7lluM ", vals[i]/mega);
272 else if (vals[i] > mega)
273 fprintf(fp, "%7lluK ", vals[i]/kilo);
274 else
275 fprintf(fp, "%8llu ", vals[i]);
276
277 if (vals[k] > giga) {
278 sprintf(temp, "%uM", (unsigned)(vals[k]/mega));
279 fprintf(fp, "%-6s ", temp);
280 } else if (vals[k] > mega) {
281 sprintf(temp, "%uK", (unsigned)(vals[k]/kilo));
282 fprintf(fp, "%-6s ", temp);
283 } else
284 fprintf(fp, "%-6u ", (unsigned)vals[k]);
285 }
286
print_head(FILE * fp)287 void print_head(FILE *fp)
288 {
289 fprintf(fp, "#%s\n", info_source);
290 fprintf(fp, "%-15s ", "Interface");
291
292 fprintf(fp, "%8s/%-6s ", "RX Pkts", "Rate");
293 fprintf(fp, "%8s/%-6s ", "TX Pkts", "Rate");
294 fprintf(fp, "%8s/%-6s ", "RX Data", "Rate");
295 fprintf(fp, "%8s/%-6s\n","TX Data", "Rate");
296
297 if (!show_errors) {
298 fprintf(fp, "%-15s ", "");
299 fprintf(fp, "%8s/%-6s ", "RX Errs", "Drop");
300 fprintf(fp, "%8s/%-6s ", "TX Errs", "Drop");
301 fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
302 fprintf(fp, "%8s/%-6s\n","TX Coll", "Rate");
303 } else {
304 fprintf(fp, "%-15s ", "");
305 fprintf(fp, "%8s/%-6s ", "RX Errs", "Rate");
306 fprintf(fp, "%8s/%-6s ", "RX Drop", "Rate");
307 fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
308 fprintf(fp, "%8s/%-6s\n","RX Leng", "Rate");
309
310 fprintf(fp, "%-15s ", "");
311 fprintf(fp, "%8s/%-6s ", "RX Crc", "Rate");
312 fprintf(fp, "%8s/%-6s ", "RX Frm", "Rate");
313 fprintf(fp, "%8s/%-6s ", "RX Fifo", "Rate");
314 fprintf(fp, "%8s/%-6s\n","RX Miss", "Rate");
315
316 fprintf(fp, "%-15s ", "");
317 fprintf(fp, "%8s/%-6s ", "TX Errs", "Rate");
318 fprintf(fp, "%8s/%-6s ", "TX Drop", "Rate");
319 fprintf(fp, "%8s/%-6s ", "TX Coll", "Rate");
320 fprintf(fp, "%8s/%-6s\n","TX Carr", "Rate");
321
322 fprintf(fp, "%-15s ", "");
323 fprintf(fp, "%8s/%-6s ", "TX Abrt", "Rate");
324 fprintf(fp, "%8s/%-6s ", "TX Fifo", "Rate");
325 fprintf(fp, "%8s/%-6s ", "TX Hear", "Rate");
326 fprintf(fp, "%8s/%-6s\n","TX Wind", "Rate");
327 }
328 }
329
print_one_if(FILE * fp,struct ifstat_ent * n,unsigned long long * vals)330 void print_one_if(FILE *fp, struct ifstat_ent *n, unsigned long long *vals)
331 {
332 int i;
333 fprintf(fp, "%-15s ", n->name);
334 for (i=0; i<4; i++)
335 format_rate(fp, vals, n->rate, i);
336 fprintf(fp, "\n");
337
338 if (!show_errors) {
339 fprintf(fp, "%-15s ", "");
340 format_pair(fp, vals, 4, 6);
341 format_pair(fp, vals, 5, 7);
342 format_rate(fp, vals, n->rate, 11);
343 format_rate(fp, vals, n->rate, 9);
344 fprintf(fp, "\n");
345 } else {
346 fprintf(fp, "%-15s ", "");
347 format_rate(fp, vals, n->rate, 4);
348 format_rate(fp, vals, n->rate, 6);
349 format_rate(fp, vals, n->rate, 11);
350 format_rate(fp, vals, n->rate, 10);
351 fprintf(fp, "\n");
352
353 fprintf(fp, "%-15s ", "");
354 format_rate(fp, vals, n->rate, 12);
355 format_rate(fp, vals, n->rate, 13);
356 format_rate(fp, vals, n->rate, 14);
357 format_rate(fp, vals, n->rate, 15);
358 fprintf(fp, "\n");
359
360 fprintf(fp, "%-15s ", "");
361 format_rate(fp, vals, n->rate, 5);
362 format_rate(fp, vals, n->rate, 7);
363 format_rate(fp, vals, n->rate, 9);
364 format_rate(fp, vals, n->rate, 17);
365 fprintf(fp, "\n");
366
367 fprintf(fp, "%-15s ", "");
368 format_rate(fp, vals, n->rate, 16);
369 format_rate(fp, vals, n->rate, 18);
370 format_rate(fp, vals, n->rate, 19);
371 format_rate(fp, vals, n->rate, 20);
372 fprintf(fp, "\n");
373 }
374 }
375
376
dump_kern_db(FILE * fp)377 void dump_kern_db(FILE *fp)
378 {
379 struct ifstat_ent *n;
380
381 print_head(fp);
382
383 for (n=kern_db; n; n=n->next) {
384 if (!match(n->name))
385 continue;
386 print_one_if(fp, n, n->val);
387 }
388 }
389
390
dump_incr_db(FILE * fp)391 void dump_incr_db(FILE *fp)
392 {
393 struct ifstat_ent *n, *h;
394 h = hist_db;
395
396 print_head(fp);
397
398 for (n=kern_db; n; n=n->next) {
399 int i;
400 unsigned long long vals[MAXS];
401 struct ifstat_ent *h1;
402
403 memcpy(vals, n->val, sizeof(vals));
404
405 for (h1 = h; h1; h1 = h1->next) {
406 if (h1->ifindex == n->ifindex) {
407 for (i = 0; i < MAXS; i++)
408 vals[i] -= h1->val[i];
409 h = h1->next;
410 break;
411 }
412 }
413 if (!match(n->name))
414 continue;
415 print_one_if(fp, n, vals);
416 }
417 }
418
419
420 static int children;
421
sigchild(int signo)422 void sigchild(int signo)
423 {
424 }
425
update_db(int interval)426 void update_db(int interval)
427 {
428 struct ifstat_ent *n, *h;
429
430 n = kern_db;
431 kern_db = NULL;
432
433 load_info();
434
435 h = kern_db;
436 kern_db = n;
437
438 for (n = kern_db; n; n = n->next) {
439 struct ifstat_ent *h1;
440 for (h1 = h; h1; h1 = h1->next) {
441 if (h1->ifindex == n->ifindex) {
442 int i;
443 for (i = 0; i < MAXS; i++) {
444 if ((long)(h1->ival[i] - n->ival[i]) < 0) {
445 memset(n->ival, 0, sizeof(n->ival));
446 break;
447 }
448 }
449 for (i = 0; i < MAXS; i++) {
450 double sample;
451 unsigned long incr = h1->ival[i] - n->ival[i];
452 n->val[i] += incr;
453 n->ival[i] = h1->ival[i];
454 sample = (double)(incr*1000)/interval;
455 if (interval >= scan_interval) {
456 n->rate[i] += W*(sample-n->rate[i]);
457 } else if (interval >= 1000) {
458 if (interval >= time_constant) {
459 n->rate[i] = sample;
460 } else {
461 double w = W*(double)interval/scan_interval;
462 n->rate[i] += w*(sample-n->rate[i]);
463 }
464 }
465 }
466
467 while (h != h1) {
468 struct ifstat_ent *tmp = h;
469 h = h->next;
470 free(tmp->name);
471 free(tmp);
472 };
473 h = h1->next;
474 free(h1->name);
475 free(h1);
476 break;
477 }
478 }
479 }
480 }
481
482 #define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
483
484
server_loop(int fd)485 void server_loop(int fd)
486 {
487 struct timeval snaptime = { 0 };
488 struct pollfd p;
489 p.fd = fd;
490 p.events = p.revents = POLLIN;
491
492 sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
493 getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
494
495 load_info();
496
497 for (;;) {
498 int status;
499 int tdiff;
500 struct timeval now;
501
502 gettimeofday(&now, NULL);
503 tdiff = T_DIFF(now, snaptime);
504 if (tdiff >= scan_interval) {
505 update_db(tdiff);
506 snaptime = now;
507 tdiff = 0;
508 }
509
510 if (poll(&p, 1, tdiff + scan_interval) > 0
511 && (p.revents&POLLIN)) {
512 int clnt = accept(fd, NULL, NULL);
513 if (clnt >= 0) {
514 pid_t pid;
515 if (children >= 5) {
516 close(clnt);
517 } else if ((pid = fork()) != 0) {
518 if (pid>0)
519 children++;
520 close(clnt);
521 } else {
522 FILE *fp = fdopen(clnt, "w");
523 if (fp) {
524 if (tdiff > 0)
525 update_db(tdiff);
526 dump_raw_db(fp, 0);
527 }
528 exit(0);
529 }
530 }
531 }
532 while (children && waitpid(-1, &status, WNOHANG) > 0)
533 children--;
534 }
535 }
536
verify_forging(int fd)537 int verify_forging(int fd)
538 {
539 struct ucred cred;
540 socklen_t olen = sizeof(cred);
541
542 if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) ||
543 olen < sizeof(cred))
544 return -1;
545 if (cred.uid == getuid() || cred.uid == 0)
546 return 0;
547 return -1;
548 }
549
550 static void usage(void) __attribute__((noreturn));
551
usage(void)552 static void usage(void)
553 {
554 fprintf(stderr,
555 "Usage: ifstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
556 " -h, --help this message\n"
557 " -a, --ignore ignore history\n"
558 " -d, --scan=SECS sample every statistics every SECS\n"
559 " -e, --errors show errors\n"
560 " -n, --nooutput do history only\n"
561 " -r, --reset reset history\n"
562 " -s, --noupdate don;t update history\n"
563 " -t, --interval=SECS report average over the last SECS\n"
564 " -V, --version output version information\n"
565 " -z, --zeros show entries with zero activity\n");
566
567 exit(-1);
568 }
569
570 static const struct option longopts[] = {
571 { "help", 0, 0, 'h' },
572 { "ignore", 0, 0, 'a' },
573 { "scan", 1, 0, 'd'},
574 { "errors", 0, 0, 'e' },
575 { "nooutput", 0, 0, 'n' },
576 { "reset", 0, 0, 'r' },
577 { "noupdate", 0, 0, 's' },
578 { "interval", 1, 0, 't' },
579 { "version", 0, 0, 'V' },
580 { "zeros", 0, 0, 'z' },
581 { 0 }
582 };
583
main(int argc,char * argv[])584 int main(int argc, char *argv[])
585 {
586 char hist_name[128];
587 struct sockaddr_un sun;
588 FILE *hist_fp = NULL;
589 int ch;
590 int fd;
591
592 while ((ch = getopt_long(argc, argv, "hvVzrnasd:t:eK",
593 longopts, NULL)) != EOF) {
594 switch(ch) {
595 case 'z':
596 dump_zeros = 1;
597 break;
598 case 'r':
599 reset_history = 1;
600 break;
601 case 'a':
602 ignore_history = 1;
603 break;
604 case 's':
605 no_update = 1;
606 break;
607 case 'n':
608 no_output = 1;
609 break;
610 case 'e':
611 show_errors = 1;
612 break;
613 case 'd':
614 scan_interval = atoi(optarg) * 1000;
615 if (scan_interval <= 0) {
616 fprintf(stderr, "ifstat: invalid scan interval\n");
617 exit(-1);
618 }
619 break;
620 case 't':
621 time_constant = atoi(optarg);
622 if (time_constant <= 0) {
623 fprintf(stderr, "ifstat: invalid time constant divisor\n");
624 exit(-1);
625 }
626 break;
627 case 'v':
628 case 'V':
629 printf("ifstat utility, iproute2-ss%s\n", SNAPSHOT);
630 exit(0);
631 case 'h':
632 case '?':
633 default:
634 usage();
635 }
636 }
637
638 argc -= optind;
639 argv += optind;
640
641 sun.sun_family = AF_UNIX;
642 sun.sun_path[0] = 0;
643 sprintf(sun.sun_path+1, "ifstat%d", getuid());
644
645 if (scan_interval > 0) {
646 if (time_constant == 0)
647 time_constant = 60;
648 time_constant *= 1000;
649 W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
650 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
651 perror("ifstat: socket");
652 exit(-1);
653 }
654 if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
655 perror("ifstat: bind");
656 exit(-1);
657 }
658 if (listen(fd, 5) < 0) {
659 perror("ifstat: listen");
660 exit(-1);
661 }
662 if (daemon(0, 0)) {
663 perror("ifstat: daemon");
664 exit(-1);
665 }
666 signal(SIGPIPE, SIG_IGN);
667 signal(SIGCHLD, sigchild);
668 server_loop(fd);
669 exit(0);
670 }
671
672 patterns = argv;
673 npatterns = argc;
674
675 if (getenv("IFSTAT_HISTORY"))
676 snprintf(hist_name, sizeof(hist_name),
677 "%s", getenv("IFSTAT_HISTORY"));
678 else
679 snprintf(hist_name, sizeof(hist_name),
680 "%s/.ifstat.u%d", P_tmpdir, getuid());
681
682 if (reset_history)
683 unlink(hist_name);
684
685 if (!ignore_history || !no_update) {
686 struct stat stb;
687
688 fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
689 if (fd < 0) {
690 perror("ifstat: open history file");
691 exit(-1);
692 }
693 if ((hist_fp = fdopen(fd, "r+")) == NULL) {
694 perror("ifstat: fdopen history file");
695 exit(-1);
696 }
697 if (flock(fileno(hist_fp), LOCK_EX)) {
698 perror("ifstat: flock history file");
699 exit(-1);
700 }
701 if (fstat(fileno(hist_fp), &stb) != 0) {
702 perror("ifstat: fstat history file");
703 exit(-1);
704 }
705 if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
706 fprintf(stderr, "ifstat: something is so wrong with history file, that I prefer not to proceed.\n");
707 exit(-1);
708 }
709 if (!ignore_history) {
710 FILE *tfp;
711 long uptime = -1;
712 if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
713 if (fscanf(tfp, "%ld", &uptime) != 1)
714 uptime = -1;
715 fclose(tfp);
716 }
717 if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
718 fprintf(stderr, "ifstat: history is aged out, resetting\n");
719 ftruncate(fileno(hist_fp), 0);
720 }
721 }
722
723 load_raw_table(hist_fp);
724
725 hist_db = kern_db;
726 kern_db = NULL;
727 }
728
729 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
730 (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
731 || (strcpy(sun.sun_path+1, "ifstat0"),
732 connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
733 && verify_forging(fd) == 0) {
734 FILE *sfp = fdopen(fd, "r");
735 load_raw_table(sfp);
736 if (hist_db && source_mismatch) {
737 fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
738 hist_db = NULL;
739 }
740 fclose(sfp);
741 } else {
742 if (fd >= 0)
743 close(fd);
744 if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
745 fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
746 hist_db = NULL;
747 info_source[0] = 0;
748 }
749 load_info();
750 if (info_source[0] == 0)
751 strcpy(info_source, "kernel");
752 }
753
754 if (!no_output) {
755 if (ignore_history || hist_db == NULL)
756 dump_kern_db(stdout);
757 else
758 dump_incr_db(stdout);
759 }
760 if (!no_update) {
761 ftruncate(fileno(hist_fp), 0);
762 rewind(hist_fp);
763 dump_raw_db(hist_fp, 1);
764 fflush(hist_fp);
765 }
766 exit(0);
767 }
768