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/*
* linkdetect.c - simple link detection
*
* heavily based on mii-tool.c from net-tools, just cut down to what we need
* for anaconda
*
* Copyright 2002 Red Hat, Inc.
* Copyright 2000 David A. Hinds -- dhinds@pcmcia.sourceforge.org
*
* Jeremy Katz <katzj@redhat.com>
*
* This software may be freely redistributed under the terms of the GNU
* general public license.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <errno.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <net/if.h>
#include "mii.h"
static struct ifreq ifr;
static int mdio_read(int skfd, int location)
{
struct mii_data *mii = (struct mii_data *)&ifr.ifr_data;
mii->reg_num = location;
if (ioctl(skfd, SIOCGMIIREG, &ifr) < 0) {
fprintf(stderr, "SIOCGMIIREG on %s failed: %s\n", ifr.ifr_name,
strerror(errno));
return -1;
}
return mii->val_out;
}
/* we don't need writing right now */
#if 0
static void mdio_write(int skfd, int location, int value)
{
struct mii_data *mii = (struct mii_data *)&ifr.ifr_data;
mii->reg_num = location;
mii->val_in = value;
if (ioctl(skfd, SIOCSMIIREG, &ifr) < 0) {
fprintf(stderr, "SIOCSMIIREG on %s failed: %s\n", ifr.ifr_name,
strerror(errno));
}
}
#endif
int get_link_status(char *ifname) {
struct mii_data *mii = (struct mii_data *)&ifr.ifr_data;
int sock, i, mii_val[32];
if ((sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
fprintf(stderr, "Error creating socket: %s\n", strerror(errno));
return -1;
}
/* Get the vitals from the interface. */
strncpy(ifr.ifr_name, ifname, IFNAMSIZ);
if (ioctl(sock, SIOCGMIIPHY, &ifr) < 0) {
if (errno != ENODEV)
fprintf(stderr, "SIOCGMIIPHY on '%s' failed: %s\n",
ifname, strerror(errno));
return -1;
}
/* Some bits in the BMSR are latched, but we can't rely on being
the only reader, so only the current values are meaningful */
mdio_read(sock, MII_BMSR);
for (i = 0; i < 8; i++)
mii_val[i] = mdio_read(sock, i);
if (mii_val[MII_BMCR] == 0xffff) {
fprintf(stderr, " No MII transceiver present!.\n");
return -1;
}
if (mii_val[MII_BMSR] & MII_BMSR_LINK_VALID)
return 1;
else
return 0;
}
#ifdef STANDALONE
/* hooray for stupid test programs! */
int main(int argc, char **argv) {
printf("link status of eth0 is %d\n", get_link_status("eth0"));
}
#endif
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