plan9port/src/libip/myetheraddr.c
2003-11-23 18:23:20 +00:00

41 lines
622 B
C

#include <u.h>
#include <libc.h>
#include <ip.h>
int
myetheraddr(uchar *to, char *dev)
{
int n, fd;
char buf[256], *ptr;
/* Make one exist */
if(*dev == '/')
sprint(buf, "%s/clone", dev);
else
sprint(buf, "/net/%s/clone", dev);
fd = open(buf, ORDWR);
if(fd >= 0)
close(fd);
if(*dev == '/')
sprint(buf, "%s/0/stats", dev);
else
sprint(buf, "/net/%s/0/stats", dev);
fd = open(buf, OREAD);
if(fd < 0)
return -1;
n = read(fd, buf, sizeof(buf)-1);
close(fd);
if(n <= 0)
return -1;
buf[n] = 0;
ptr = strstr(buf, "addr: ");
if(!ptr)
return -1;
ptr += 6;
parseether(to, ptr);
return 0;
}