#ifndef lint
static const char rcsid[] =
"$Id: if.c,v 1.7 2006/01/16 04:53:59 lindak Exp $";
#endif
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <sys/time.h>
#include <net/if.h>
#include <net/if_var.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <net/if_mib.h>
#include <net/ethernet.h>
#include <net/route.h>
#include <netinet/in.h>
#include <netinet/in_var.h>
#include <arpa/inet.h>
#include <signal.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <err.h>
#include "netstat.h"
#define YES 1
#define NO 0
#define ROUNDUP(a, size) (((a) & ((size) - 1)) ? (1 + ((a)|(size - 1))) : (a))
#define NEXT_SA(p) (struct sockaddr *) \
((caddr_t)p + (p->sa_len ? ROUNDUP(p->sa_len, sizeof(uint32_t)) : \
sizeof(uint32_t)))
static void sidewaysintpr ();
static void catchalarm (int);
#ifdef INET6
char *netname6 (struct sockaddr_in6 *, struct sockaddr *);
static char ntop_buf[INET6_ADDRSTRLEN];
#endif
static void
show_stat(const char *fmt, int width, u_int64_t value, short showvalue)
{
char newfmt[32];
if (showvalue) {
sprintf(newfmt, "%%%d%s", width, fmt);
printf(newfmt, value);
} else {
sprintf(newfmt, "%%%ds", width);
printf(newfmt, "-");
}
}
size_t
get_rti_info(int addrs, struct sockaddr *sa, struct sockaddr **rti_info)
{
int i;
size_t len = 0;
for (i = 0; i < RTAX_MAX; i++) {
if (addrs & (1 << i)) {
rti_info[i] = sa;
if (sa->sa_len < sizeof(struct sockaddr))
len += sizeof(struct sockaddr);
else
len += sa->sa_len;
sa = NEXT_SA(sa);
} else {
rti_info[i] = NULL;
}
}
return len;
}
static void
multipr(int family, char *buf, char *lim)
{
char *next;
for (next = buf; next < lim; ) {
struct ifma_msghdr2 *ifmam = (struct ifma_msghdr2 *)next;
struct sockaddr *rti_info[RTAX_MAX];
struct sockaddr *sa;
const char *fmt = 0;
next += ifmam->ifmam_msglen;
if (ifmam->ifmam_type == RTM_IFINFO2)
break;
else if (ifmam->ifmam_type != RTM_NEWMADDR2)
continue;
get_rti_info(ifmam->ifmam_addrs, (struct sockaddr*)(ifmam + 1), rti_info);
sa = rti_info[RTAX_IFA];
if (sa->sa_family != family)
continue;
switch (sa->sa_family) {
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
fmt = routename(sin->sin_addr.s_addr);
break;
}
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 sin6;
memcpy(&sin6, sa, sizeof(struct sockaddr_in6));
if (IN6_IS_ADDR_LINKLOCAL(&sin6.sin6_addr) ||
IN6_IS_ADDR_MC_LINKLOCAL(&sin6.sin6_addr)) {
sin6.sin6_scope_id = ntohs(*(u_int16_t *)&sin6.sin6_addr.s6_addr[2]);
sin6.sin6_addr.s6_addr[2] = 0;
sin6.sin6_addr.s6_addr[3] = 0;
}
printf("%23s %-19.19s(refs: %d)\n", "",
inet_ntop(AF_INET6, &sin6.sin6_addr,
ntop_buf, sizeof(ntop_buf)),
ifmam->ifmam_refcount);
break;
}
#endif
case AF_LINK: {
struct sockaddr_dl *sdl = (struct sockaddr_dl *)sa;
switch (sdl->sdl_type) {
case IFT_ETHER:
case IFT_FDDI:
fmt = ether_ntoa((struct ether_addr *)
LLADDR(sdl));
break;
}
break;
}
}
if (fmt)
printf("%23s %s\n", "", fmt);
}
}
void
intpr(void (*pfunc)(char *))
{
u_int64_t opackets = 0;
u_int64_t ipackets = 0;
u_int64_t obytes = 0;
u_int64_t ibytes = 0;
u_int64_t oerrors = 0;
u_int64_t ierrors = 0;
u_int64_t collisions = 0;
uint32_t mtu = 0;
short timer = 0;
int drops = 0;
struct sockaddr *sa = NULL;
char name[32];
short network_layer;
short link_layer;
int mib[6];
char *buf = NULL, *lim, *next;
size_t len;
struct if_msghdr *ifm;
struct sockaddr *rti_info[RTAX_MAX];
unsigned int ifindex = 0;
if (interval) {
sidewaysintpr();
return;
}
if (interface != 0)
ifindex = if_nametoindex(interface);
mib[0] = CTL_NET; mib[1] = PF_ROUTE; mib[2] = 0; mib[3] = 0; mib[4] = NET_RT_IFLIST2; mib[5] = 0;
if (sysctl(mib, 6, NULL, &len, NULL, 0) < 0)
return;
if ((buf = malloc(len)) == NULL) {
printf("malloc failed\n");
exit(1);
}
if (sysctl(mib, 6, buf, &len, NULL, 0) < 0) {
if (buf)
free(buf);
return;
}
if (!pfunc) {
printf("%-5.5s %-5.5s %-13.13s %-15.15s %8.8s %5.5s",
"Name", "Mtu", "Network", "Address", "Ipkts", "Ierrs");
if (bflag)
printf(" %10.10s","Ibytes");
printf(" %8.8s %5.5s", "Opkts", "Oerrs");
if (bflag)
printf(" %10.10s","Obytes");
printf(" %5s", "Coll");
if (tflag)
printf(" %s", "Time");
if (dflag)
printf(" %s", "Drop");
putchar('\n');
}
lim = buf + len;
for (next = buf; next < lim; ) {
char *cp;
int n, m;
network_layer = 0;
link_layer = 0;
ifm = (struct if_msghdr *)next;
next += ifm->ifm_msglen;
if (ifm->ifm_type == RTM_IFINFO2) {
struct if_msghdr2 *if2m = (struct if_msghdr2 *)ifm;
struct sockaddr_dl *sdl = (struct sockaddr_dl *)(if2m + 1);
strncpy(name, sdl->sdl_data, sdl->sdl_nlen);
name[sdl->sdl_nlen] = 0;
if (interface != 0 && if2m->ifm_index != ifindex)
continue;
cp = index(name, '\0');
if (pfunc) {
(*pfunc)(name);
continue;
}
if ((if2m->ifm_flags & IFF_UP) == 0)
*cp++ = '*';
*cp = '\0';
opackets = if2m->ifm_data.ifi_opackets;
ipackets = if2m->ifm_data.ifi_ipackets;
obytes = if2m->ifm_data.ifi_obytes;
ibytes = if2m->ifm_data.ifi_ibytes;
oerrors =if2m->ifm_data.ifi_oerrors;
ierrors = if2m->ifm_data.ifi_ierrors;
collisions = if2m->ifm_data.ifi_collisions;
timer = if2m->ifm_timer;
drops = if2m->ifm_snd_drops;
mtu = if2m->ifm_data.ifi_mtu;
get_rti_info(if2m->ifm_addrs, (struct sockaddr*)(if2m + 1), rti_info);
sa = rti_info[RTAX_IFP];
} else if (ifm->ifm_type == RTM_NEWADDR) {
struct ifa_msghdr *ifam = (struct ifa_msghdr *)ifm;
if (interface != 0 && ifam->ifam_index != ifindex)
continue;
get_rti_info(ifam->ifam_addrs, (struct sockaddr*)(ifam + 1), rti_info);
sa = rti_info[RTAX_IFA];
} else {
continue;
}
printf("%-5.5s %-5u ", name, mtu);
if (sa == 0) {
printf("%-13.13s ", "none");
printf("%-15.15s ", "none");
} else {
switch (sa->sa_family) {
case AF_UNSPEC:
printf("%-13.13s ", "none");
printf("%-15.15s ", "none");
break;
case AF_INET: {
struct sockaddr_in *sin = (struct sockaddr_in *)sa;
struct sockaddr_in mask;
mask.sin_addr.s_addr = 0;
memcpy(&mask,
rti_info[RTAX_NETMASK],
((struct sockaddr_in *)rti_info[RTAX_NETMASK])->sin_len);
printf("%-13.13s ",
netname(sin->sin_addr.s_addr & mask.sin_addr.s_addr,
ntohl(mask.sin_addr.s_addr)));
printf("%-15.15s ",
routename(sin->sin_addr.s_addr));
network_layer = 1;
break;
}
#ifdef INET6
case AF_INET6: {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
struct sockaddr *mask = (struct sockaddr *)rti_info[RTAX_NETMASK];
printf("%-11.11s ",
netname6(sin6,
mask));
printf("%-17.17s ",
(char *)inet_ntop(AF_INET6,
&sin6->sin6_addr,
ntop_buf, sizeof(ntop_buf)));
network_layer = 1;
break;
}
#endif
case AF_LINK: {
struct sockaddr_dl *sdl =
(struct sockaddr_dl *)sa;
char linknum[10];
cp = (char *)LLADDR(sdl);
n = sdl->sdl_alen;
sprintf(linknum, "<Link#%d>", sdl->sdl_index);
m = printf("%-11.11s ", linknum);
goto hexprint;
}
default:
m = printf("(%d)", sa->sa_family);
for (cp = sa->sa_len + (char *)sa;
--cp > sa->sa_data && (*cp == 0);) {}
n = cp - sa->sa_data + 1;
cp = sa->sa_data;
hexprint:
while (--n >= 0)
m += printf("%02x%c", *cp++ & 0xff,
n > 0 ? ':' : ' ');
m = 30 - m;
while (m-- > 0)
putchar(' ');
link_layer = 1;
break;
}
}
show_stat("llu", 8, ipackets, link_layer|network_layer);
printf(" ");
show_stat("llu", 5, ierrors, link_layer);
printf(" ");
if (bflag) {
show_stat("llu", 10, ibytes, link_layer|network_layer);
printf(" ");
}
show_stat("llu", 8, opackets, link_layer|network_layer);
printf(" ");
show_stat("llu", 5, oerrors, link_layer);
printf(" ");
if (bflag) {
show_stat("llu", 10, obytes, link_layer|network_layer);
printf(" ");
}
show_stat("llu", 5, collisions, link_layer);
if (tflag) {
printf(" ");
show_stat("ll", 3, timer, link_layer);
}
if (dflag) {
printf(" ");
show_stat("ll", 3, drops, link_layer);
}
putchar('\n');
if (aflag)
multipr(sa->sa_family, next, lim);
}
}
struct iftot {
SLIST_ENTRY(iftot) chain;
char ift_name[16];
u_int64_t ift_ip;
u_int64_t ift_ie;
u_int64_t ift_op;
u_int64_t ift_oe;
u_int64_t ift_co;
u_int64_t ift_dr;
u_int64_t ift_ib;
u_int64_t ift_ob;
u_int64_t ift_itcp;
u_int64_t ift_itcb;
u_int64_t ift_otcp;
u_int64_t ift_otcb;
};
u_char signalled;
static void
sidewaysintpr()
{
struct iftot *total, *sum, *interesting;
register int line;
int first;
int name[6];
size_t len;
unsigned int ifcount, i;
struct ifmibdata *ifmdall = 0;
int interesting_row;
sigset_t sigset, oldsigset;
struct itimerval timer_interval;
name[0] = CTL_NET;
name[1] = PF_LINK;
name[2] = NETLINK_GENERIC;
len = sizeof(int);
name[3] = IFMIB_SYSTEM;
name[4] = IFMIB_IFCOUNT;
if (sysctl(name, 5, &ifcount, &len, 0, 0) == 1)
err(1, "sysctl IFMIB_IFCOUNT");
len = ifcount * sizeof(struct ifmibdata);
ifmdall = malloc(len);
if (ifmdall == 0)
err(1, "malloc failed");
name[3] = IFMIB_IFALLDATA;
name[4] = 0;
name[5] = IFDATA_GENERAL;
if (sysctl(name, 6, ifmdall, &len, (void *)0, 0) == -1)
err(1, "sysctl IFMIB_IFALLDATA");
interesting = NULL;
interesting_row = 0;
for (i = 0; i < ifcount; i++) {
struct ifmibdata *ifmd = ifmdall + i;
if (interface && strcmp(ifmd->ifmd_name, interface) == 0) {
if ((interesting = calloc(ifcount, sizeof(struct iftot))) == NULL)
err(1, "malloc failed");
interesting_row = i + 1;
snprintf(interesting->ift_name, 16, "(%s)", ifmd->ifmd_name);;
}
}
if ((total = calloc(1, sizeof(struct iftot))) == NULL)
err(1, "malloc failed");
if ((sum = calloc(1, sizeof(struct iftot))) == NULL)
err(1, "malloc failed");
timer_interval.it_value.tv_sec = interval;
timer_interval.it_value.tv_usec = 0;
timer_interval.it_interval.tv_sec = interval;
timer_interval.it_interval.tv_usec = 0;
(void)signal(SIGALRM, catchalarm);
signalled = NO;
(void)setitimer(ITIMER_REAL, &timer_interval, NULL);
first = 1;
banner:
if (prioflag)
printf("%37s %14s %16s", "input",
interesting ? interesting->ift_name : "(Total)", "output");
else
printf("%17s %14s %16s", "input",
interesting ? interesting->ift_name : "(Total)", "output");
putchar('\n');
printf("%10s %5s %10s ",
"packets", "errs", "bytes");
if (prioflag)
printf(" %10s %10s", "tcpkts", "tcbytes");
printf("%10s %5s %10s %5s",
"packets", "errs", "bytes", "colls");
if (dflag)
printf(" %5.5s", "drops");
if (prioflag)
printf(" %10s %10s", "tcpkts", "tcbytes");
putchar('\n');
fflush(stdout);
line = 0;
loop:
if (interesting != NULL) {
struct ifmibdata ifmd;
struct ifmibdata_supplemental ifmsupp;
len = sizeof(struct ifmibdata);
name[3] = IFMIB_IFDATA;
name[4] = interesting_row;
name[5] = IFDATA_GENERAL;
if (sysctl(name, 6, &ifmd, &len, (void *)0, 0) == -1)
err(1, "sysctl IFDATA_GENERAL %d", interesting_row);
if (prioflag) {
len = sizeof(struct ifmibdata_supplemental);
name[3] = IFMIB_IFDATA;
name[4] = interesting_row;
name[5] = IFDATA_SUPPLEMENTAL;
if (sysctl(name, 6, &ifmsupp, &len, (void *)0, 0) == -1)
err(1, "sysctl IFDATA_SUPPLEMENTAL %d", interesting_row);
}
if (!first) {
printf("%10llu %5llu %10llu ",
ifmd.ifmd_data.ifi_ipackets - interesting->ift_ip,
ifmd.ifmd_data.ifi_ierrors - interesting->ift_ie,
ifmd.ifmd_data.ifi_ibytes - interesting->ift_ib);
switch (prioflag) {
case SO_TC_BK:
printf("%10llu %10llu ",
ifmsupp.ifmd_traffic_class.ifi_ibkpackets - interesting->ift_itcp,
ifmsupp.ifmd_traffic_class.ifi_ibkbytes - interesting->ift_itcb);
break;
case SO_TC_VI:
printf("%10llu %10llu ",
ifmsupp.ifmd_traffic_class.ifi_ivipackets - interesting->ift_itcp,
ifmsupp.ifmd_traffic_class.ifi_ivibytes - interesting->ift_itcb);
break;
case SO_TC_VO:
printf("%10llu %10llu ",
ifmsupp.ifmd_traffic_class.ifi_ivopackets - interesting->ift_itcp,
ifmsupp.ifmd_traffic_class.ifi_ivobytes - interesting->ift_itcb);
break;
default:
break;
}
printf("%10llu %5llu %10llu %5llu",
ifmd.ifmd_data.ifi_opackets - interesting->ift_op,
ifmd.ifmd_data.ifi_oerrors - interesting->ift_oe,
ifmd.ifmd_data.ifi_obytes - interesting->ift_ob,
ifmd.ifmd_data.ifi_collisions - interesting->ift_co);
if (dflag)
printf(" %5llu", ifmd.ifmd_snd_drops - interesting->ift_dr);
switch (prioflag) {
case SO_TC_BK:
printf(" %10llu %10llu",
ifmsupp.ifmd_traffic_class.ifi_obkpackets - interesting->ift_otcp,
ifmsupp.ifmd_traffic_class.ifi_obkbytes - interesting->ift_otcb);
break;
case SO_TC_VI:
printf(" %10llu %10llu",
ifmsupp.ifmd_traffic_class.ifi_ovipackets - interesting->ift_otcp,
ifmsupp.ifmd_traffic_class.ifi_ovibytes - interesting->ift_otcb);
break;
case SO_TC_VO:
printf(" %10llu %10llu",
ifmsupp.ifmd_traffic_class.ifi_ovopackets - interesting->ift_otcp,
ifmsupp.ifmd_traffic_class.ifi_ovobytes - interesting->ift_otcb);
break;
default:
break;
}
}
interesting->ift_ip = ifmd.ifmd_data.ifi_ipackets;
interesting->ift_ie = ifmd.ifmd_data.ifi_ierrors;
interesting->ift_ib = ifmd.ifmd_data.ifi_ibytes;
interesting->ift_op = ifmd.ifmd_data.ifi_opackets;
interesting->ift_oe = ifmd.ifmd_data.ifi_oerrors;
interesting->ift_ob = ifmd.ifmd_data.ifi_obytes;
interesting->ift_co = ifmd.ifmd_data.ifi_collisions;
interesting->ift_dr = ifmd.ifmd_snd_drops;
switch (prioflag) {
case SO_TC_BK:
interesting->ift_itcp = ifmsupp.ifmd_traffic_class.ifi_ibkpackets;
interesting->ift_itcb = ifmsupp.ifmd_traffic_class.ifi_ibkbytes;
interesting->ift_otcp = ifmsupp.ifmd_traffic_class.ifi_obkpackets;
interesting->ift_otcb = ifmsupp.ifmd_traffic_class.ifi_obkbytes;
break;
case SO_TC_VI:
interesting->ift_itcp = ifmsupp.ifmd_traffic_class.ifi_ivipackets;
interesting->ift_itcb = ifmsupp.ifmd_traffic_class.ifi_ivibytes;
interesting->ift_otcp = ifmsupp.ifmd_traffic_class.ifi_ovipackets;
interesting->ift_otcb = ifmsupp.ifmd_traffic_class.ifi_ovibytes;
break;
case SO_TC_VO:
interesting->ift_itcp = ifmsupp.ifmd_traffic_class.ifi_ivopackets;
interesting->ift_itcb = ifmsupp.ifmd_traffic_class.ifi_ivobytes;
interesting->ift_otcp = ifmsupp.ifmd_traffic_class.ifi_ovopackets;
interesting->ift_otcb = ifmsupp.ifmd_traffic_class.ifi_ovobytes;
break;
default:
break;
}
} else {
unsigned int latest_ifcount;
struct ifmibdata_supplemental *ifmsuppall = NULL;
len = sizeof(int);
name[3] = IFMIB_SYSTEM;
name[4] = IFMIB_IFCOUNT;
if (sysctl(name, 5, &latest_ifcount, &len, 0, 0) == 1)
err(1, "sysctl IFMIB_IFCOUNT");
if (latest_ifcount > ifcount) {
ifcount = latest_ifcount;
len = ifcount * sizeof(struct ifmibdata);
free(ifmdall);
ifmdall = malloc(len);
if (ifmdall == 0)
err(1, "malloc ifmdall failed");
} else if (latest_ifcount > ifcount) {
ifcount = latest_ifcount;
len = ifcount * sizeof(struct ifmibdata);
}
len = ifcount * sizeof(struct ifmibdata);
name[3] = IFMIB_IFALLDATA;
name[4] = 0;
name[5] = IFDATA_GENERAL;
if (sysctl(name, 6, ifmdall, &len, (void *)0, 0) == -1)
err(1, "sysctl IFMIB_IFALLDATA");
if (prioflag) {
len = ifcount * sizeof(struct ifmibdata_supplemental);
ifmsuppall = malloc(len);
if (ifmsuppall == NULL)
err(1, "malloc ifmsuppall failed");
name[3] = IFMIB_IFALLDATA;
name[4] = 0;
name[5] = IFDATA_SUPPLEMENTAL;
if (sysctl(name, 6, ifmsuppall, &len, (void *)0, 0) == -1)
err(1, "sysctl IFMIB_IFALLDATA SUPPLEMENTAL");
}
sum->ift_ip = 0;
sum->ift_ie = 0;
sum->ift_ib = 0;
sum->ift_op = 0;
sum->ift_oe = 0;
sum->ift_ob = 0;
sum->ift_co = 0;
sum->ift_dr = 0;
sum->ift_itcp = 0;
sum->ift_itcb = 0;
sum->ift_otcp = 0;
sum->ift_otcb = 0;
for (i = 0; i < ifcount; i++) {
struct ifmibdata *ifmd = ifmdall + i;
sum->ift_ip += ifmd->ifmd_data.ifi_ipackets;
sum->ift_ie += ifmd->ifmd_data.ifi_ierrors;
sum->ift_ib += ifmd->ifmd_data.ifi_ibytes;
sum->ift_op += ifmd->ifmd_data.ifi_opackets;
sum->ift_oe += ifmd->ifmd_data.ifi_oerrors;
sum->ift_ob += ifmd->ifmd_data.ifi_obytes;
sum->ift_co += ifmd->ifmd_data.ifi_collisions;
sum->ift_dr += ifmd->ifmd_snd_drops;
if (prioflag) {
struct ifmibdata_supplemental *ifmsupp = ifmsuppall + i;
switch (prioflag) {
case SO_TC_BK:
sum->ift_itcp += ifmsupp->ifmd_traffic_class.ifi_ibkpackets;
sum->ift_itcb += ifmsupp->ifmd_traffic_class.ifi_ibkbytes;
sum->ift_otcp += ifmsupp->ifmd_traffic_class.ifi_obkpackets;
sum->ift_otcb += ifmsupp->ifmd_traffic_class.ifi_obkbytes;
break;
case SO_TC_VI:
sum->ift_itcp += ifmsupp->ifmd_traffic_class.ifi_ivipackets;
sum->ift_itcb += ifmsupp->ifmd_traffic_class.ifi_ivibytes;
sum->ift_otcp += ifmsupp->ifmd_traffic_class.ifi_ovipackets;
sum->ift_otcb += ifmsupp->ifmd_traffic_class.ifi_ovibytes;
break;
case SO_TC_VO:
sum->ift_itcp += ifmsupp->ifmd_traffic_class.ifi_ivopackets;
sum->ift_itcb += ifmsupp->ifmd_traffic_class.ifi_ivobytes;
sum->ift_otcp += ifmsupp->ifmd_traffic_class.ifi_ovopackets;
sum->ift_otcb += ifmsupp->ifmd_traffic_class.ifi_ovobytes;
break;
default:
break;
}
}
}
if (!first) {
printf("%10llu %5llu %10llu ",
sum->ift_ip - total->ift_ip,
sum->ift_ie - total->ift_ie,
sum->ift_ib - total->ift_ib);
if (prioflag)
printf(" %10llu %10llu",
sum->ift_itcp - total->ift_itcp,
sum->ift_itcb - total->ift_itcb);
printf("%10llu %5llu %10llu %5llu",
sum->ift_op - total->ift_op,
sum->ift_oe - total->ift_oe,
sum->ift_ob - total->ift_ob,
sum->ift_co - total->ift_co);
if (dflag)
printf(" %5llu", sum->ift_dr - total->ift_dr);
if (prioflag)
printf(" %10llu %10llu",
sum->ift_otcp - total->ift_otcp,
sum->ift_otcb - total->ift_otcb);
}
*total = *sum;
}
if (!first)
putchar('\n');
fflush(stdout);
sigemptyset(&sigset);
sigaddset(&sigset, SIGALRM);
(void)sigprocmask(SIG_BLOCK, &sigset, &oldsigset);
if (!signalled) {
sigemptyset(&sigset);
sigsuspend(&sigset);
}
(void)sigprocmask(SIG_SETMASK, &oldsigset, NULL);
signalled = NO;
line++;
first = 0;
if (line == 21)
goto banner;
else
goto loop;
}
void
intervalpr(void (*pr)(uint32_t, char *, int), uint32_t off, char *name , int af)
{
struct itimerval timer_interval;
sigset_t sigset, oldsigset;
timer_interval.it_value.tv_sec = interval;
timer_interval.it_value.tv_usec = 0;
timer_interval.it_interval.tv_sec = interval;
timer_interval.it_interval.tv_usec = 0;
(void) signal(SIGALRM, catchalarm);
signalled = NO;
(void) setitimer(ITIMER_REAL, &timer_interval, NULL);
for (;;) {
pr(off, name, af);
fflush(stdout);
sigemptyset(&sigset);
sigaddset(&sigset, SIGALRM);
(void) sigprocmask(SIG_BLOCK, &sigset, &oldsigset);
if (!signalled) {
sigemptyset(&sigset);
sigsuspend(&sigset);
}
(void) sigprocmask(SIG_SETMASK, &oldsigset, NULL);
signalled = NO;
}
}
static void
catchalarm(int signo )
{
signalled = YES;
}