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/netdevice.h>
33
34 #include <SNAPSHOT.h>
35
36 int dump_zeros = 0;
37 int reset_history = 0;
38 int ignore_history = 0;
39 int no_output = 0;
40 int no_update = 0;
41 int scan_interval = 0;
42 int time_constant = 0;
43 int show_errors = 0;
44 double W;
45 char **patterns;
46 int npatterns;
47
48 char info_source[128];
49 int source_mismatch;
50
51 #define MAXS (sizeof(struct net_device_stats)/sizeof(unsigned long))
52
53 struct ifstat_ent
54 {
55 struct ifstat_ent *next;
56 char *name;
57 int ifindex;
58 unsigned long long val[MAXS];
59 double rate[MAXS];
60 unsigned long ival[MAXS];
61 };
62
63 struct ifstat_ent *kern_db;
64 struct ifstat_ent *hist_db;
65
match(const char * id)66 static int match(const char *id)
67 {
68 int i;
69
70 if (npatterns == 0)
71 return 1;
72
73 for (i=0; i<npatterns; i++) {
74 if (!fnmatch(patterns[i], id, 0))
75 return 1;
76 }
77 return 0;
78 }
79
get_nlmsg(const struct sockaddr_nl * who,struct nlmsghdr * m,void * arg)80 static int get_nlmsg(const struct sockaddr_nl *who,
81 struct nlmsghdr *m, void *arg)
82 {
83 struct ifinfomsg *ifi = NLMSG_DATA(m);
84 struct rtattr * tb[IFLA_MAX+1];
85 int len = m->nlmsg_len;
86 struct ifstat_ent *n;
87 int i;
88
89 if (m->nlmsg_type != RTM_NEWLINK)
90 return 0;
91
92 len -= NLMSG_LENGTH(sizeof(*ifi));
93 if (len < 0)
94 return -1;
95
96 if (!(ifi->ifi_flags&IFF_UP))
97 return 0;
98
99 parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
100 if (tb[IFLA_IFNAME] == NULL || tb[IFLA_STATS] == NULL)
101 return 0;
102
103 n = malloc(sizeof(*n));
104 if (!n)
105 abort();
106 n->ifindex = ifi->ifi_index;
107 n->name = strdup(RTA_DATA(tb[IFLA_IFNAME]));
108 memcpy(&n->ival, RTA_DATA(tb[IFLA_STATS]), sizeof(n->ival));
109 memset(&n->rate, 0, sizeof(n->rate));
110 for (i=0; i<MAXS; i++)
111 n->val[i] = n->ival[i];
112 n->next = kern_db;
113 kern_db = n;
114 return 0;
115 }
116
load_info(void)117 void load_info(void)
118 {
119 struct ifstat_ent *db, *n;
120 struct rtnl_handle rth;
121
122 if (rtnl_open(&rth, 0) < 0)
123 exit(1);
124
125 if (rtnl_wilddump_request(&rth, AF_INET, RTM_GETLINK) < 0) {
126 perror("Cannot send dump request");
127 exit(1);
128 }
129
130 if (rtnl_dump_filter(&rth, get_nlmsg, NULL, NULL, NULL) < 0) {
131 fprintf(stderr, "Dump terminated\n");
132 exit(1);
133 }
134
135 rtnl_close(&rth);
136
137 db = kern_db;
138 kern_db = NULL;
139
140 while (db) {
141 n = db;
142 db = db->next;
143 n->next = kern_db;
144 kern_db = n;
145 }
146 }
147
load_raw_table(FILE * fp)148 void load_raw_table(FILE *fp)
149 {
150 char buf[4096];
151 struct ifstat_ent *db = NULL;
152 struct ifstat_ent *n;
153
154 while (fgets(buf, sizeof(buf), fp) != NULL) {
155 char *p;
156 char *next;
157 int i;
158
159 if (buf[0] == '#') {
160 buf[strlen(buf)-1] = 0;
161 if (info_source[0] && strcmp(info_source, buf+1))
162 source_mismatch = 1;
163 strncpy(info_source, buf+1, sizeof(info_source)-1);
164 continue;
165 }
166 if ((n = malloc(sizeof(*n))) == NULL)
167 abort();
168
169 if (!(p = strchr(buf, ' ')))
170 abort();
171 *p++ = 0;
172
173 if (sscanf(buf, "%d", &n->ifindex) != 1)
174 abort();
175 if (!(next = strchr(p, ' ')))
176 abort();
177 *next++ = 0;
178
179 n->name = strdup(p);
180 p = next;
181
182 for (i=0; i<MAXS; i++) {
183 unsigned rate;
184 if (!(next = strchr(p, ' ')))
185 abort();
186 *next++ = 0;
187 if (sscanf(p, "%llu", n->val+i) != 1)
188 abort();
189 n->ival[i] = (unsigned long)n->val[i];
190 p = next;
191 if (!(next = strchr(p, ' ')))
192 abort();
193 *next++ = 0;
194 if (sscanf(p, "%u", &rate) != 1)
195 abort();
196 n->rate[i] = rate;
197 p = next;
198 }
199 n->next = db;
200 db = n;
201 }
202
203 while (db) {
204 n = db;
205 db = db->next;
206 n->next = kern_db;
207 kern_db = n;
208 }
209 }
210
dump_raw_db(FILE * fp,int to_hist)211 void dump_raw_db(FILE *fp, int to_hist)
212 {
213 struct ifstat_ent *n, *h;
214 h = hist_db;
215 fprintf(fp, "#%s\n", info_source);
216
217 for (n=kern_db; n; n=n->next) {
218 int i;
219 unsigned long long *vals = n->val;
220 double *rates = n->rate;
221 if (!match(n->name)) {
222 struct ifstat_ent *h1;
223 if (!to_hist)
224 continue;
225 for (h1 = h; h1; h1 = h1->next) {
226 if (h1->ifindex == n->ifindex) {
227 vals = h1->val;
228 rates = h1->rate;
229 h = h1->next;
230 break;
231 }
232 }
233 }
234 fprintf(fp, "%d %s ", n->ifindex, n->name);
235 for (i=0; i<MAXS; i++)
236 fprintf(fp, "%llu %u ", vals[i], (unsigned)rates[i]);
237 fprintf(fp, "\n");
238 }
239 }
240
241 /* use communication definitions of meg/kilo etc */
242 static const unsigned long long giga = 1000000000ull;
243 static const unsigned long long mega = 1000000;
244 static const unsigned long long kilo = 1000;
245
format_rate(FILE * fp,unsigned long long * vals,double * rates,int i)246 void format_rate(FILE *fp, unsigned long long *vals, double *rates, int i)
247 {
248 char temp[64];
249 if (vals[i] > giga)
250 fprintf(fp, "%7lluM ", vals[i]/mega);
251 else if (vals[i] > mega)
252 fprintf(fp, "%7lluK ", vals[i]/kilo);
253 else
254 fprintf(fp, "%8llu ", vals[i]);
255
256 if (rates[i] > mega) {
257 sprintf(temp, "%uM", (unsigned)(rates[i]/mega));
258 fprintf(fp, "%-6s ", temp);
259 } else if (rates[i] > kilo) {
260 sprintf(temp, "%uK", (unsigned)(rates[i]/kilo));
261 fprintf(fp, "%-6s ", temp);
262 } else
263 fprintf(fp, "%-6u ", (unsigned)rates[i]);
264 }
265
format_pair(FILE * fp,unsigned long long * vals,int i,int k)266 void format_pair(FILE *fp, unsigned long long *vals, int i, int k)
267 {
268 char temp[64];
269 if (vals[i] > giga)
270 fprintf(fp, "%7lluM ", vals[i]/mega);
271 else if (vals[i] > mega)
272 fprintf(fp, "%7lluK ", vals[i]/kilo);
273 else
274 fprintf(fp, "%8llu ", vals[i]);
275
276 if (vals[k] > giga) {
277 sprintf(temp, "%uM", (unsigned)(vals[k]/mega));
278 fprintf(fp, "%-6s ", temp);
279 } else if (vals[k] > mega) {
280 sprintf(temp, "%uK", (unsigned)(vals[k]/kilo));
281 fprintf(fp, "%-6s ", temp);
282 } else
283 fprintf(fp, "%-6u ", (unsigned)vals[k]);
284 }
285
print_head(FILE * fp)286 void print_head(FILE *fp)
287 {
288 fprintf(fp, "#%s\n", info_source);
289 fprintf(fp, "%-15s ", "Interface");
290
291 fprintf(fp, "%8s/%-6s ", "RX Pkts", "Rate");
292 fprintf(fp, "%8s/%-6s ", "TX Pkts", "Rate");
293 fprintf(fp, "%8s/%-6s ", "RX Data", "Rate");
294 fprintf(fp, "%8s/%-6s\n","TX Data", "Rate");
295
296 if (!show_errors) {
297 fprintf(fp, "%-15s ", "");
298 fprintf(fp, "%8s/%-6s ", "RX Errs", "Drop");
299 fprintf(fp, "%8s/%-6s ", "TX Errs", "Drop");
300 fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
301 fprintf(fp, "%8s/%-6s\n","TX Coll", "Rate");
302 } else {
303 fprintf(fp, "%-15s ", "");
304 fprintf(fp, "%8s/%-6s ", "RX Errs", "Rate");
305 fprintf(fp, "%8s/%-6s ", "RX Drop", "Rate");
306 fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
307 fprintf(fp, "%8s/%-6s\n","RX Leng", "Rate");
308
309 fprintf(fp, "%-15s ", "");
310 fprintf(fp, "%8s/%-6s ", "RX Crc", "Rate");
311 fprintf(fp, "%8s/%-6s ", "RX Frm", "Rate");
312 fprintf(fp, "%8s/%-6s ", "RX Fifo", "Rate");
313 fprintf(fp, "%8s/%-6s\n","RX Miss", "Rate");
314
315 fprintf(fp, "%-15s ", "");
316 fprintf(fp, "%8s/%-6s ", "TX Errs", "Rate");
317 fprintf(fp, "%8s/%-6s ", "TX Drop", "Rate");
318 fprintf(fp, "%8s/%-6s ", "TX Coll", "Rate");
319 fprintf(fp, "%8s/%-6s\n","TX Carr", "Rate");
320
321 fprintf(fp, "%-15s ", "");
322 fprintf(fp, "%8s/%-6s ", "TX Abrt", "Rate");
323 fprintf(fp, "%8s/%-6s ", "TX Fifo", "Rate");
324 fprintf(fp, "%8s/%-6s ", "TX Hear", "Rate");
325 fprintf(fp, "%8s/%-6s\n","TX Wind", "Rate");
326 }
327 }
328
print_one_if(FILE * fp,struct ifstat_ent * n,unsigned long long * vals)329 void print_one_if(FILE *fp, struct ifstat_ent *n, unsigned long long *vals)
330 {
331 int i;
332 fprintf(fp, "%-15s ", n->name);
333 for (i=0; i<4; i++)
334 format_rate(fp, vals, n->rate, i);
335 fprintf(fp, "\n");
336
337 if (!show_errors) {
338 fprintf(fp, "%-15s ", "");
339 format_pair(fp, vals, 4, 6);
340 format_pair(fp, vals, 5, 7);
341 format_rate(fp, vals, n->rate, 11);
342 format_rate(fp, vals, n->rate, 9);
343 fprintf(fp, "\n");
344 } else {
345 fprintf(fp, "%-15s ", "");
346 format_rate(fp, vals, n->rate, 4);
347 format_rate(fp, vals, n->rate, 6);
348 format_rate(fp, vals, n->rate, 11);
349 format_rate(fp, vals, n->rate, 10);
350 fprintf(fp, "\n");
351
352 fprintf(fp, "%-15s ", "");
353 format_rate(fp, vals, n->rate, 12);
354 format_rate(fp, vals, n->rate, 13);
355 format_rate(fp, vals, n->rate, 14);
356 format_rate(fp, vals, n->rate, 15);
357 fprintf(fp, "\n");
358
359 fprintf(fp, "%-15s ", "");
360 format_rate(fp, vals, n->rate, 5);
361 format_rate(fp, vals, n->rate, 7);
362 format_rate(fp, vals, n->rate, 9);
363 format_rate(fp, vals, n->rate, 17);
364 fprintf(fp, "\n");
365
366 fprintf(fp, "%-15s ", "");
367 format_rate(fp, vals, n->rate, 16);
368 format_rate(fp, vals, n->rate, 18);
369 format_rate(fp, vals, n->rate, 19);
370 format_rate(fp, vals, n->rate, 20);
371 fprintf(fp, "\n");
372 }
373 }
374
375
dump_kern_db(FILE * fp)376 void dump_kern_db(FILE *fp)
377 {
378 struct ifstat_ent *n, *h;
379 h = hist_db;
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 " -e, --errors show errors\n"
567 " -z, --zeros show entries with zero activity\n");
568
569 exit(-1);
570 }
571
572 static const struct option longopts[] = {
573 { "help", 0, 0, 'h' },
574 { "ignore", 0, 0, 'a' },
575 { "scan", 1, 0, 'd'},
576 { "errors", 0, 0, 'e' },
577 { "nooutput", 0, 0, 'n' },
578 { "reset", 0, 0, 'r' },
579 { "noupdate", 0, 0, 's' },
580 { "interval", 1, 0, 't' },
581 { "version", 0, 0, 'V' },
582 { "zeros", 0, 0, 'z' },
583 { "errors", 0, 0, 'e' },
584 { "zeros", 0, 0, 'z' },
585 { 0 }
586 };
587
main(int argc,char * argv[])588 int main(int argc, char *argv[])
589 {
590 char hist_name[128];
591 struct sockaddr_un sun;
592 FILE *hist_fp = NULL;
593 int ch;
594 int fd;
595
596 while ((ch = getopt_long(argc, argv, "hvVzrnasd:t:eK",
597 longopts, NULL)) != EOF) {
598 switch(ch) {
599 case 'z':
600 dump_zeros = 1;
601 break;
602 case 'r':
603 reset_history = 1;
604 break;
605 case 'a':
606 ignore_history = 1;
607 break;
608 case 's':
609 no_update = 1;
610 break;
611 case 'n':
612 no_output = 1;
613 break;
614 case 'e':
615 show_errors = 1;
616 break;
617 case 'd':
618 scan_interval = atoi(optarg) * 1000;
619 if (scan_interval <= 0) {
620 fprintf(stderr, "ifstat: invalid scan interval\n");
621 exit(-1);
622 }
623 break;
624 case 't':
625 time_constant = atoi(optarg);
626 if (time_constant <= 0) {
627 fprintf(stderr, "ifstat: invalid time constant divisor\n");
628 exit(-1);
629 }
630 break;
631 case 'v':
632 case 'V':
633 printf("ifstat utility, iproute2-ss%s\n", SNAPSHOT);
634 exit(0);
635 case 'h':
636 case '?':
637 default:
638 usage();
639 }
640 }
641
642 argc -= optind;
643 argv += optind;
644
645 sun.sun_family = AF_UNIX;
646 sun.sun_path[0] = 0;
647 sprintf(sun.sun_path+1, "ifstat%d", getuid());
648
649 if (scan_interval > 0) {
650 if (time_constant == 0)
651 time_constant = 60;
652 time_constant *= 1000;
653 W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
654 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
655 perror("ifstat: socket");
656 exit(-1);
657 }
658 if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
659 perror("ifstat: bind");
660 exit(-1);
661 }
662 if (listen(fd, 5) < 0) {
663 perror("ifstat: listen");
664 exit(-1);
665 }
666 if (daemon(0, 0)) {
667 perror("ifstat: daemon");
668 exit(-1);
669 }
670 signal(SIGPIPE, SIG_IGN);
671 signal(SIGCHLD, sigchild);
672 server_loop(fd);
673 exit(0);
674 }
675
676 patterns = argv;
677 npatterns = argc;
678
679 if (getenv("IFSTAT_HISTORY"))
680 snprintf(hist_name, sizeof(hist_name), getenv("IFSTAT_HISTORY"));
681 else
682 sprintf(hist_name, "%s/.ifstat.u%d", P_tmpdir, getuid());
683
684 if (reset_history)
685 unlink(hist_name);
686
687 if (!ignore_history || !no_update) {
688 struct stat stb;
689
690 fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
691 if (fd < 0) {
692 perror("ifstat: open history file");
693 exit(-1);
694 }
695 if ((hist_fp = fdopen(fd, "r+")) == NULL) {
696 perror("ifstat: fdopen history file");
697 exit(-1);
698 }
699 if (flock(fileno(hist_fp), LOCK_EX)) {
700 perror("ifstat: flock history file");
701 exit(-1);
702 }
703 if (fstat(fileno(hist_fp), &stb) != 0) {
704 perror("ifstat: fstat history file");
705 exit(-1);
706 }
707 if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
708 fprintf(stderr, "ifstat: something is so wrong with history file, that I prefer not to proceed.\n");
709 exit(-1);
710 }
711 if (!ignore_history) {
712 FILE *tfp;
713 long uptime;
714 if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
715 if (fscanf(tfp, "%ld", &uptime) != 1)
716 uptime = -1;
717 fclose(tfp);
718 }
719 if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
720 fprintf(stderr, "ifstat: history is aged out, resetting\n");
721 ftruncate(fileno(hist_fp), 0);
722 }
723 }
724
725 load_raw_table(hist_fp);
726
727 hist_db = kern_db;
728 kern_db = NULL;
729 }
730
731 if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
732 (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
733 || (strcpy(sun.sun_path+1, "ifstat0"),
734 connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
735 && verify_forging(fd) == 0) {
736 FILE *sfp = fdopen(fd, "r");
737 load_raw_table(sfp);
738 if (hist_db && source_mismatch) {
739 fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
740 hist_db = NULL;
741 }
742 fclose(sfp);
743 } else {
744 if (fd >= 0)
745 close(fd);
746 if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
747 fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
748 hist_db = NULL;
749 info_source[0] = 0;
750 }
751 load_info();
752 if (info_source[0] == 0)
753 strcpy(info_source, "kernel");
754 }
755
756 if (!no_output) {
757 if (ignore_history || hist_db == NULL)
758 dump_kern_db(stdout);
759 else
760 dump_incr_db(stdout);
761 }
762 if (!no_update) {
763 ftruncate(fileno(hist_fp), 0);
764 rewind(hist_fp);
765 dump_raw_db(hist_fp, 1);
766 fflush(hist_fp);
767 }
768 exit(0);
769 }
770