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Be a bit more persistent when the NET_RT_IFLIST sysctl returns ENOMEM

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rather than dropping out immediately.
This commit is contained in:
Brian Somers 2001-04-03 08:21:28 +00:00
parent 0fea4ed0d0
commit 152a439010
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=75121
1 changed files with 27 additions and 18 deletions
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45
usr.sbin/ppp/iface.c
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@ -94,7 +94,7 @@ bitsinmask(struct in_addr mask)
struct iface *
iface_Create(const char *name)
{
int mib[6], s;
int mib[6], s, maxtries, err;
size_t needed, namelen;
char *buf, *ptr, *end;
struct if_msghdr *ifm;
@ -117,25 +117,34 @@ iface_Create(const char *name)
mib[4] = NET_RT_IFLIST;
mib[5] = 0;
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
fprintf(stderr, "iface_Create: sysctl: estimate: %s\n",
strerror(errno));
close(s);
return NULL;
}
maxtries = 20;
err = 0;
do {
if (maxtries-- == 0 || (err && err != ENOMEM)) {
fprintf(stderr, "iface_Create: sysctl: %s\n", strerror(err));
close(s);
return NULL;
}
if ((buf = (char *)malloc(needed)) == NULL) {
fprintf(stderr, "iface_Create: malloc failed: %s\n", strerror(errno));
close(s);
return NULL;
}
if (sysctl(mib, 6, NULL, &needed, NULL, 0) < 0) {
fprintf(stderr, "iface_Create: sysctl: estimate: %s\n",
strerror(errno));
close(s);
return NULL;
}
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
fprintf(stderr, "iface_Create: sysctl: %s\n", strerror(errno));
free(buf);
close(s);
return NULL;
}
if ((buf = (char *)malloc(needed)) == NULL) {
fprintf(stderr, "iface_Create: malloc failed: %s\n", strerror(errno));
close(s);
return NULL;
}
if (sysctl(mib, 6, buf, &needed, NULL, 0) < 0) {
err = errno;
free(buf);
buf = NULL;
}
} while (buf == NULL);
ptr = buf;
end = buf + needed;