X-Git-Url: http://git.onelab.eu/?a=blobdiff_plain;f=misc%2Fifstat.c;fp=misc%2Fifstat.c;h=1379a8115b172acbe0ff7bcd86d081f279c83199;hb=4f7d3057911ebc5df78113896cb02e1b4ffbfabe;hp=0000000000000000000000000000000000000000;hpb=8a59994861a17eb92c11553d88631757ee8e63c3;p=iproute2.git

diff --git a/misc/ifstat.c b/misc/ifstat.c
new file mode 100644
index 0000000..1379a81
--- /dev/null
+++ b/misc/ifstat.c
@@ -0,0 +1,766 @@
+/*
+ * ifstat.c	handy utility to read net interface statistics
+ *
+ *		This program is free software; you can redistribute it and/or
+ *		modify it under the terms of the GNU General Public License
+ *		as published by the Free Software Foundation; either version
+ *		2 of the License, or (at your option) any later version.
+ *
+ * Authors:	Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <time.h>
+#include <sys/time.h>
+#include <fnmatch.h>
+#include <sys/file.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <sys/poll.h>
+#include <sys/wait.h>
+#include <sys/stat.h>
+#include <signal.h>
+#include <math.h>
+#include <getopt.h>
+
+#include <libnetlink.h>
+#include <linux/netdevice.h>
+
+#include <SNAPSHOT.h>
+
+int dump_zeros = 0;
+int reset_history = 0;
+int ignore_history = 0;
+int no_output = 0;
+int no_update = 0;
+int scan_interval = 0;
+int time_constant = 0;
+int show_errors = 0;
+double W;
+char **patterns;
+int npatterns;
+
+char info_source[128];
+int source_mismatch;
+
+#define MAXS (sizeof(struct net_device_stats)/sizeof(unsigned long))
+
+struct ifstat_ent
+{
+	struct ifstat_ent	*next;
+	char			*name;
+	int			ifindex;
+	unsigned long long	val[MAXS];
+	double			rate[MAXS];
+	unsigned long		ival[MAXS];
+};
+
+struct ifstat_ent *kern_db;
+struct ifstat_ent *hist_db;
+
+static int match(const char *id)
+{
+	int i;
+
+	if (npatterns == 0)
+		return 1;
+
+	for (i=0; i<npatterns; i++) {
+		if (!fnmatch(patterns[i], id, 0))
+			return 1;
+	}
+	return 0;
+}
+
+static int get_nlmsg(const struct sockaddr_nl *who, 
+		     struct nlmsghdr *m, void *arg)
+{
+	struct ifinfomsg *ifi = NLMSG_DATA(m);
+	struct rtattr * tb[IFLA_MAX+1];
+	int len = m->nlmsg_len;
+	struct ifstat_ent *n;
+	int i;
+
+	if (m->nlmsg_type != RTM_NEWLINK)
+		return 0;
+
+	len -= NLMSG_LENGTH(sizeof(*ifi));
+	if (len < 0)
+		return -1;
+
+	if (!(ifi->ifi_flags&IFF_UP))
+		return 0;
+
+	parse_rtattr(tb, IFLA_MAX, IFLA_RTA(ifi), len);
+	if (tb[IFLA_IFNAME] == NULL || tb[IFLA_STATS] == NULL)
+		return 0;
+
+	n = malloc(sizeof(*n));
+	if (!n)
+		abort();
+	n->ifindex = ifi->ifi_index;
+	n->name = strdup(RTA_DATA(tb[IFLA_IFNAME]));
+	memcpy(&n->ival, RTA_DATA(tb[IFLA_STATS]), sizeof(n->ival));
+	memset(&n->rate, 0, sizeof(n->rate));
+	for (i=0; i<MAXS; i++)
+		n->val[i] = n->ival[i];
+	n->next = kern_db;
+	kern_db = n;
+	return 0;
+}
+
+void load_info(void)
+{
+	struct ifstat_ent *db, *n;
+	struct rtnl_handle rth;
+
+	if (rtnl_open(&rth, 0) < 0)
+		exit(1);
+
+	if (rtnl_wilddump_request(&rth, AF_INET, RTM_GETLINK) < 0) {
+		perror("Cannot send dump request");
+		exit(1);
+	}
+
+	if (rtnl_dump_filter(&rth, get_nlmsg, NULL, NULL, NULL) < 0) {
+		fprintf(stderr, "Dump terminated\n");
+		exit(1);
+	}
+
+	rtnl_close(&rth);
+
+	db = kern_db;
+	kern_db = NULL;
+
+	while (db) {
+		n = db;
+		db = db->next;
+		n->next = kern_db;
+		kern_db = n;
+	}
+}
+
+void load_raw_table(FILE *fp)
+{
+	char buf[4096];
+	struct ifstat_ent *db = NULL;
+	struct ifstat_ent *n;
+
+	while (fgets(buf, sizeof(buf), fp) != NULL) {
+		char *p;
+		char *next;
+		int i;
+
+		if (buf[0] == '#') {
+			buf[strlen(buf)-1] = 0;
+			if (info_source[0] && strcmp(info_source, buf+1))
+				source_mismatch = 1;
+			strncpy(info_source, buf+1, sizeof(info_source)-1);
+			continue;
+		}
+		if ((n = malloc(sizeof(*n))) == NULL)
+			abort();
+
+		if (!(p = strchr(buf, ' ')))
+			abort();
+		*p++ = 0;
+
+		if (sscanf(buf, "%d", &n->ifindex) != 1)
+			abort();
+		if (!(next = strchr(p, ' ')))
+			abort();
+		*next++ = 0;
+
+		n->name = strdup(p);
+		p = next;
+
+		for (i=0; i<MAXS; i++) {
+			unsigned rate;
+			if (!(next = strchr(p, ' ')))
+				abort();
+			*next++ = 0;
+			if (sscanf(p, "%llu", n->val+i) != 1)
+				abort();
+			n->ival[i] = (unsigned long)n->val[i];
+			p = next;
+			if (!(next = strchr(p, ' ')))
+				abort();
+			*next++ = 0;
+			if (sscanf(p, "%u", &rate) != 1)
+				abort();
+			n->rate[i] = rate;
+			p = next;
+		}
+		n->next = db;
+		db = n;
+	}
+
+	while (db) {
+		n = db;
+		db = db->next;
+		n->next = kern_db;
+		kern_db = n;
+	}
+}
+
+void dump_raw_db(FILE *fp, int to_hist)
+{
+	struct ifstat_ent *n, *h;
+	h = hist_db;
+	fprintf(fp, "#%s\n", info_source);
+
+	for (n=kern_db; n; n=n->next) {
+		int i;
+		unsigned long long *vals = n->val;
+		double *rates = n->rate;
+		if (!match(n->name)) {
+			struct ifstat_ent *h1;
+			if (!to_hist)
+				continue;
+			for (h1 = h; h1; h1 = h1->next) {
+				if (h1->ifindex == n->ifindex) {
+					vals = h1->val;
+					rates = h1->rate;
+					h = h1->next;
+					break;
+				}
+			}
+		}
+		fprintf(fp, "%d %s ", n->ifindex, n->name);
+		for (i=0; i<MAXS; i++)
+			fprintf(fp, "%llu %u ", vals[i], (unsigned)rates[i]);
+		fprintf(fp, "\n");
+	}
+}
+
+/* use communication definitions of meg/kilo etc */
+static const unsigned long long giga = 1000000000ull;
+static const unsigned long long mega = 1000000;
+static const unsigned long long kilo = 1000;
+
+void format_rate(FILE *fp, unsigned long long *vals, double *rates, int i)
+{
+	char temp[64];
+	if (vals[i] > giga)
+		fprintf(fp, "%7lluM ", vals[i]/mega);
+	else if (vals[i] > mega)
+		fprintf(fp, "%7lluK ", vals[i]/kilo);
+	else
+		fprintf(fp, "%8llu ", vals[i]);
+
+	if (rates[i] > mega) {
+		sprintf(temp, "%uM", (unsigned)(rates[i]/mega));
+		fprintf(fp, "%-6s ", temp);
+	} else if (rates[i] > kilo) {
+		sprintf(temp, "%uK", (unsigned)(rates[i]/kilo));
+		fprintf(fp, "%-6s ", temp);
+	} else
+		fprintf(fp, "%-6u ", (unsigned)rates[i]);
+}
+
+void format_pair(FILE *fp, unsigned long long *vals, int i, int k)
+{
+	char temp[64];
+	if (vals[i] > giga)
+		fprintf(fp, "%7lluM ", vals[i]/mega);
+	else if (vals[i] > mega)
+		fprintf(fp, "%7lluK ", vals[i]/kilo);
+	else
+		fprintf(fp, "%8llu ", vals[i]);
+
+	if (vals[k] > giga) {
+		sprintf(temp, "%uM", (unsigned)(vals[k]/mega));
+		fprintf(fp, "%-6s ", temp);
+	} else if (vals[k] > mega) {
+		sprintf(temp, "%uK", (unsigned)(vals[k]/kilo));
+		fprintf(fp, "%-6s ", temp);
+	} else
+		fprintf(fp, "%-6u ", (unsigned)vals[k]);
+}
+
+void print_head(FILE *fp)
+{
+	fprintf(fp, "#%s\n", info_source);
+	fprintf(fp, "%-15s ", "Interface");
+
+	fprintf(fp, "%8s/%-6s ", "RX Pkts", "Rate");
+	fprintf(fp, "%8s/%-6s ", "TX Pkts", "Rate");
+	fprintf(fp, "%8s/%-6s ", "RX Data", "Rate");
+	fprintf(fp, "%8s/%-6s\n","TX Data", "Rate");
+
+	if (!show_errors) {
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "RX Errs", "Drop");
+		fprintf(fp, "%8s/%-6s ", "TX Errs", "Drop");
+		fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
+		fprintf(fp, "%8s/%-6s\n","TX Coll", "Rate");
+	} else {
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "RX Errs", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Drop", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Over", "Rate");
+		fprintf(fp, "%8s/%-6s\n","RX Leng", "Rate");
+
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "RX Crc", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Frm", "Rate");
+		fprintf(fp, "%8s/%-6s ", "RX Fifo", "Rate");
+		fprintf(fp, "%8s/%-6s\n","RX Miss", "Rate");
+
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "TX Errs", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Drop", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Coll", "Rate");
+		fprintf(fp, "%8s/%-6s\n","TX Carr", "Rate");
+
+		fprintf(fp, "%-15s ", "");
+		fprintf(fp, "%8s/%-6s ", "TX Abrt", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Fifo", "Rate");
+		fprintf(fp, "%8s/%-6s ", "TX Hear", "Rate");
+		fprintf(fp, "%8s/%-6s\n","TX Wind", "Rate");
+	}
+}
+
+void print_one_if(FILE *fp, struct ifstat_ent *n, unsigned long long *vals)
+{
+	int i;
+	fprintf(fp, "%-15s ", n->name);
+	for (i=0; i<4; i++)
+		format_rate(fp, vals, n->rate, i);
+	fprintf(fp, "\n");
+
+	if (!show_errors) {
+		fprintf(fp, "%-15s ", "");
+		format_pair(fp, vals, 4, 6);
+		format_pair(fp, vals, 5, 7);
+		format_rate(fp, vals, n->rate, 11);
+		format_rate(fp, vals, n->rate, 9);
+		fprintf(fp, "\n");
+	} else {
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 4);
+		format_rate(fp, vals, n->rate, 6);
+		format_rate(fp, vals, n->rate, 11);
+		format_rate(fp, vals, n->rate, 10);
+		fprintf(fp, "\n");
+
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 12);
+		format_rate(fp, vals, n->rate, 13);
+		format_rate(fp, vals, n->rate, 14);
+		format_rate(fp, vals, n->rate, 15);
+		fprintf(fp, "\n");
+
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 5);
+		format_rate(fp, vals, n->rate, 7);
+		format_rate(fp, vals, n->rate, 9);
+		format_rate(fp, vals, n->rate, 17);
+		fprintf(fp, "\n");
+
+		fprintf(fp, "%-15s ", "");
+		format_rate(fp, vals, n->rate, 16);
+		format_rate(fp, vals, n->rate, 18);
+		format_rate(fp, vals, n->rate, 19);
+		format_rate(fp, vals, n->rate, 20);
+		fprintf(fp, "\n");
+	}
+}
+
+
+void dump_kern_db(FILE *fp)
+{
+	struct ifstat_ent *n, *h;
+	h = hist_db;
+
+	print_head(fp);
+
+	for (n=kern_db; n; n=n->next) {
+		if (!match(n->name))
+			continue;
+		print_one_if(fp, n, n->val);
+	}
+}
+
+
+void dump_incr_db(FILE *fp)
+{
+	struct ifstat_ent *n, *h;
+	h = hist_db;
+
+	print_head(fp);
+
+	for (n=kern_db; n; n=n->next) {
+		int i;
+		unsigned long long vals[MAXS];
+		struct ifstat_ent *h1;
+
+		memcpy(vals, n->val, sizeof(vals));
+
+		for (h1 = h; h1; h1 = h1->next) {
+			if (h1->ifindex == n->ifindex) {
+				for (i = 0; i < MAXS; i++)
+					vals[i] -= h1->val[i];
+				h = h1->next;
+				break;
+			}
+		}
+		if (!match(n->name))
+			continue;
+		print_one_if(fp, n, vals);
+	}
+}
+
+
+static int children;
+
+void sigchild(int signo)
+{
+}
+
+void update_db(int interval)
+{
+	struct ifstat_ent *n, *h;
+
+	n = kern_db;
+	kern_db = NULL;
+
+	load_info();
+
+	h = kern_db;
+	kern_db = n;
+
+	for (n = kern_db; n; n = n->next) {
+		struct ifstat_ent *h1;
+		for (h1 = h; h1; h1 = h1->next) {
+			if (h1->ifindex == n->ifindex) {
+				int i;
+				for (i = 0; i < MAXS; i++) {
+					if ((long)(h1->ival[i] - n->ival[i]) < 0) {
+						memset(n->ival, 0, sizeof(n->ival)); 
+						break;
+					}
+				}
+				for (i = 0; i < MAXS; i++) { 
+					double sample;
+					unsigned long incr = h1->ival[i] - n->ival[i];
+					n->val[i] += incr;
+					n->ival[i] = h1->ival[i];
+					sample = (double)(incr*1000)/interval;
+					if (interval >= scan_interval) {
+						n->rate[i] += W*(sample-n->rate[i]);
+					} else if (interval >= 1000) {
+						if (interval >= time_constant) {
+							n->rate[i] = sample;
+						} else {
+							double w = W*(double)interval/scan_interval;
+							n->rate[i] += w*(sample-n->rate[i]);
+						}
+					}
+				}
+
+				while (h != h1) {
+					struct ifstat_ent *tmp = h;
+					h = h->next;
+					free(tmp->name);
+					free(tmp);
+				};
+				h = h1->next;
+				free(h1->name);
+				free(h1);
+				break;
+			}
+		}
+	}
+}
+
+#define T_DIFF(a,b) (((a).tv_sec-(b).tv_sec)*1000 + ((a).tv_usec-(b).tv_usec)/1000)
+
+
+void server_loop(int fd)
+{
+	struct timeval snaptime;
+	struct pollfd p;
+	p.fd = fd;
+	p.events = p.revents = POLLIN;
+
+	sprintf(info_source, "%d.%lu sampling_interval=%d time_const=%d",
+		getpid(), (unsigned long)random(), scan_interval/1000, time_constant/1000);
+
+	load_info();
+
+	for (;;) {
+		int status;
+		int tdiff;
+		struct timeval now;
+		gettimeofday(&now, NULL);
+		tdiff = T_DIFF(now, snaptime);
+		if (tdiff >= scan_interval) {
+			update_db(tdiff);
+			snaptime = now;
+			tdiff = 0;
+		}
+		if (poll(&p, 1, tdiff + scan_interval) > 0
+		    && (p.revents&POLLIN)) {
+			int clnt = accept(fd, NULL, NULL);
+			if (clnt >= 0) {
+				pid_t pid;
+				if (children >= 5) {
+					close(clnt);
+				} else if ((pid = fork()) != 0) {
+					if (pid>0)
+						children++;
+					close(clnt);
+				} else {
+					FILE *fp = fdopen(clnt, "w");
+					if (fp) {
+						if (tdiff > 0)
+							update_db(tdiff);
+						dump_raw_db(fp, 0);
+					}
+					exit(0);
+				}
+			}
+		}
+		while (children && waitpid(-1, &status, WNOHANG) > 0)
+			children--;
+	}
+}
+
+int verify_forging(int fd)
+{
+	struct ucred cred;
+	int olen = sizeof(cred);
+	if (getsockopt(fd, SOL_SOCKET, SO_PEERCRED, (void*)&cred, &olen) ||
+	    olen < sizeof(cred))
+		return -1;
+	if (cred.uid == getuid() || cred.uid == 0)
+		return 0;
+	return -1;
+}
+
+static void usage(void) __attribute__((noreturn));
+
+static void usage(void)
+{
+	fprintf(stderr,
+"Usage: ifstat [OPTION] [ PATTERN [ PATTERN ] ]\n"
+"   -h, --help		this message\n"
+"   -a, --ignore	ignore history\n"
+"   -d, --scan=SECS	sample every statistics every SECS\n"
+"   -e, --errors	show errors\n"
+"   -n, --nooutput	do history only\n"
+"   -r, --reset		reset history\n"
+"   -s, --noupdate	don;t update history\n"
+"   -t, --interval=SECS	report average over the last SECS\n"
+"   -V, --version	output version information\n"
+"   -z, --zeros		show entries with zero activity\n"
+"   -e, --errors	show errors\n"
+"   -z, --zeros		show entries with zero activity\n");
+
+	exit(-1);
+}
+
+static const struct option longopts[] = {
+	{ "help", 0, 0, 'h' },
+	{ "ignore",  0,  0, 'a' },
+	{ "scan", 1, 0, 'd'},
+	{ "errors", 0, 0, 'e' },
+	{ "nooutput", 0, 0, 'n' },
+	{ "reset", 0, 0, 'r' },
+	{ "noupdate", 0, 0, 's' },
+	{ "interval", 1, 0, 't' },
+	{ "version", 0, 0, 'V' },
+	{ "zeros", 0, 0, 'z' },
+	{ "errors", 0, 0, 'e' },
+	{ "zeros", 0, 0, 'z' },
+	{ 0 }
+};
+
+int main(int argc, char *argv[])
+{
+	char hist_name[128];
+	struct sockaddr_un sun;
+	FILE *hist_fp = NULL;
+	int ch;
+	int fd;
+
+	while ((ch = getopt_long(argc, argv, "hvVzrnasd:t:eK",
+			longopts, NULL)) != EOF) {
+		switch(ch) {
+		case 'z':
+			dump_zeros = 1;
+			break;
+		case 'r':
+			reset_history = 1;
+			break;
+		case 'a':
+			ignore_history = 1;
+			break;
+		case 's':
+			no_update = 1;
+			break;
+		case 'n':
+			no_output = 1;
+			break;
+		case 'e':
+			show_errors = 1;
+			break;
+		case 'd':
+			scan_interval = atoi(optarg) * 1000;
+			if (scan_interval <= 0) {
+				fprintf(stderr, "ifstat: invalid scan interval\n");
+				exit(-1);
+			}
+			break;
+		case 't':
+			time_constant = atoi(optarg);
+			if (time_constant <= 0) {
+				fprintf(stderr, "ifstat: invalid time constant divisor\n");
+				exit(-1);
+			}
+			break;
+		case 'v':
+		case 'V':
+			printf("ifstat utility, iproute2-ss%s\n", SNAPSHOT);
+			exit(0);
+		case 'h':
+		case '?':
+		default:
+			usage();
+		}
+	}
+
+	argc -= optind;
+	argv += optind;
+
+	sun.sun_family = AF_UNIX;
+	sun.sun_path[0] = 0;
+	sprintf(sun.sun_path+1, "ifstat%d", getuid());
+
+	if (scan_interval > 0) {
+		if (time_constant == 0)
+			time_constant = 60;
+		time_constant *= 1000;
+		W = 1 - 1/exp(log(10)*(double)scan_interval/time_constant);
+		if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) < 0) {
+			perror("ifstat: socket");
+			exit(-1);
+		}
+		if (bind(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) < 0) {
+			perror("ifstat: bind");
+			exit(-1);
+		}
+		if (listen(fd, 5) < 0) {
+			perror("ifstat: listen");
+			exit(-1);
+		}
+		if (fork())
+			exit(0);
+		chdir("/");
+		close(0); close(1); close(2); setsid();
+		signal(SIGPIPE, SIG_IGN);
+		signal(SIGCHLD, sigchild);
+		server_loop(fd);
+		exit(0);
+	}
+
+	patterns = argv;
+	npatterns = argc;
+
+	if (getenv("IFSTAT_HISTORY"))
+		snprintf(hist_name, sizeof(hist_name), getenv("IFSTAT_HISTORY"));
+	else
+		sprintf(hist_name, "%s/.ifstat.u%d", P_tmpdir, getuid());
+
+	if (reset_history)
+		unlink(hist_name);
+
+	if (!ignore_history || !no_update) {
+		struct stat stb;
+
+		fd = open(hist_name, O_RDWR|O_CREAT|O_NOFOLLOW, 0600);
+		if (fd < 0) {
+			perror("ifstat: open history file");
+			exit(-1);
+		}
+		if ((hist_fp = fdopen(fd, "r+")) == NULL) {
+			perror("ifstat: fdopen history file");
+			exit(-1);
+		}
+		if (flock(fileno(hist_fp), LOCK_EX)) {
+			perror("ifstat: flock history file");
+			exit(-1);
+		}
+		if (fstat(fileno(hist_fp), &stb) != 0) {
+			perror("ifstat: fstat history file");
+			exit(-1);
+		}
+		if (stb.st_nlink != 1 || stb.st_uid != getuid()) {
+			fprintf(stderr, "ifstat: something is so wrong with history file, that I prefer not to proceed.\n");
+			exit(-1);
+		}
+		if (!ignore_history) {
+			FILE *tfp;
+			long uptime;
+			if ((tfp = fopen("/proc/uptime", "r")) != NULL) {
+				if (fscanf(tfp, "%ld", &uptime) != 1)
+					uptime = -1;
+				fclose(tfp);
+			}
+			if (uptime >= 0 && time(NULL) >= stb.st_mtime+uptime) {
+				fprintf(stderr, "ifstat: history is aged out, resetting\n");
+				ftruncate(fileno(hist_fp), 0);
+			}
+		}
+
+		load_raw_table(hist_fp);
+
+		hist_db = kern_db;
+		kern_db = NULL;
+	}
+
+	if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) >= 0 &&
+	    (connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0
+	     || (strcpy(sun.sun_path+1, "ifstat0"),
+		 connect(fd, (struct sockaddr*)&sun, 2+1+strlen(sun.sun_path+1)) == 0))
+	    && verify_forging(fd) == 0) {
+		FILE *sfp = fdopen(fd, "r");
+		load_raw_table(sfp);
+		if (hist_db && source_mismatch) {
+			fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
+			hist_db = NULL;
+		}
+		fclose(sfp);
+	} else {
+		if (fd >= 0)
+			close(fd);
+		if (hist_db && info_source[0] && strcmp(info_source, "kernel")) {
+			fprintf(stderr, "ifstat: history is stale, ignoring it.\n");
+			hist_db = NULL;
+			info_source[0] = 0;
+		}
+		load_info();
+		if (info_source[0] == 0)
+			strcpy(info_source, "kernel");
+	}
+
+	if (!no_output) {
+		if (ignore_history || hist_db == NULL)
+			dump_kern_db(stdout);
+		else
+			dump_incr_db(stdout);
+	}
+	if (!no_update) {
+		ftruncate(fileno(hist_fp), 0);
+		rewind(hist_fp);
+		dump_raw_db(hist_fp, 1);
+		fflush(hist_fp);
+	}
+	exit(0);
+}