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o Try hard to guess a buffer size for a fast growing routing table.

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An approach taken from killall/killall.c.

PR:		bin/76075
Submitted by:	Dmitrij Tejblum
MFC after:	3 weeks
This commit is contained in:
maxim 2005-01-24 13:27:24 +00:00
parent d5c135375c
commit 85237d203b
1 changed files with 15 additions and 5 deletions
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20
usr.sbin/arp/arp.c
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@ -456,12 +456,12 @@ search(u_long addr, action_fn *action)
{
int mib[6];
size_t needed;
char *lim, *buf, *next;
char *lim, *buf, *newbuf, *next;
struct rt_msghdr *rtm;
struct sockaddr_inarp *sin2;
struct sockaddr_dl *sdl;
char ifname[IF_NAMESIZE];
int found_entry = 0;
int st, found_entry = 0;
mib[0] = CTL_NET;
mib[1] = PF_ROUTE;
@ -473,9 +473,19 @@ search(u_long addr, action_fn *action)
err(1, "route-sysctl-estimate");
if (needed == 0) /* empty table */
return 0;
if ((buf = malloc(needed)) == NULL)
err(1, "malloc");
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0)
buf = NULL;
do {
needed += needed / 2;
newbuf = realloc(buf, needed);
if (newbuf == NULL) {
if (buf != NULL)
free(buf);
errx(1, "could not reallocate memory");
}
buf = newbuf;
st = sysctl(mib, 6, buf, &needed, NULL, 0);
} while (st == -1 && errno == ENOMEM);
if (st == -1)
err(1, "actual retrieval of routing table");
lim = buf + needed;
for (next = buf; next < lim; next += rtm->rtm_msglen) {