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Use the new SIOCGIFINDEX ioctl to efficiently map a name to an index.

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If the syscall fails, fall back on the old method as a compatability
measure.
This commit is contained in:
Jonathan Lemon 2001-10-17 20:08:15 +00:00
parent de5934508a
commit c479a8493c
1 changed files with 22 additions and 2 deletions
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24
lib/libc/net/ifname.c
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@ -35,6 +35,7 @@
#include <sys/param.h>
#include <sys/socket.h>
#include <sys/sockio.h>
#include <sys/sysctl.h>
#include <net/if.h>
#include <net/route.h>
@ -48,8 +49,8 @@
((a) > 0 ? (1 + (((a) - 1) | (sizeof(long) - 1))) : sizeof(long))
#define ADVANCE(x, n) (x += ROUNDUP((n)->sa_len))
unsigned int
if_nametoindex(ifname)
static unsigned int
if_onametoindex(ifname)
const char *ifname;
{
struct if_nameindex *iff = if_nameindex(), *ifx;
@ -69,6 +70,25 @@ if_nametoindex(ifname)
errno = ENXIO;
return 0;
}
unsigned int
if_nametoindex(ifname)
const char *ifname;
{
int s;
struct ifreq ifr;
s = socket(AF_INET, SOCK_DGRAM, 0);
if (s == -1)
return (0);
strlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
if (ioctl(s, SIOCGIFINDEX, &ifr) == -1) {
close (s);
return (if_onametoindex(ifname));
}
close(s);
return (ifr.ifr_index);
}
char *
if_indextoname(ifindex, ifname)