Hi, a while ago I asked in this forum how to get ethernet speed without any external program.
Well, nobody hepled me, so a I've been parsing ethtool answers ( ethtool eth0 | grep Speed) for a while.
But.. Today I just had to do it,and I went into ethtool sources.
Here is a program,that goes to ethtool driver and gets the information. Based on this, you could get other relevant information too.
Enjoy.
Pavel K.
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#include <string.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <net/if.h>

#include <linux/sockios.h>

/* struct for ethtool driver */
struct ethtool_cmd {
unsigned int cmd;
unsigned int supported; /* Features this interface supports */
unsigned int advertising; /* Features this interface advertises */
unsigned short speed; /* The forced speed, 10Mb, 100Mb, gigabit */
unsigned char duplex; /* Duplex, half or full */
unsigned char port; /* Which connector port */
unsigned char phy_address;
unsigned char transceiver; /* Which tranceiver to use */
unsigned char autoneg; /* Enable or disable autonegotiation */
unsigned int maxtxpkt; /* Tx pkts before generating tx int */
unsigned int maxrxpkt; /* Rx pkts before generating rx int */
unsigned int reserved[4];
};


#define SPEED_10 10
#define SPEED_100 100
#define SPEED_1000 1000
#define SPEED_10000 10000

/* Duplex, half or full. */
#define DUPLEX_HALF 0x00
#define DUPLEX_FULL 0x01

#define ETHTOOL_GSET 0x00000001 /* Get settings command for ethtool */


int GetEthSpeed(unsigned char *ethname)
{
int returnValue;
int fd;
struct ifreq ifr;
struct ethtool_cmd ecmd;

/* this entire function is almost copied from ethtool source code */
memset(&ifr, 0, sizeof(ifr));
strcpy(ifr.ifr_name, ethname); //eth0

/* Open control socket. */
fd = socket(AF_INET, SOCK_DGRAM, 0);
if (fd < 0)
{
fprintf(stdout,"Cannot get control socket");
return -1;
}
/* Pass the "get info" command to eth tool driver */
ecmd.cmd = ETHTOOL_GSET;
ifr.ifr_data = (caddr_t)&ecmd;
returnValue = ioctl(fd, SIOCETHTOOL, &ifr);

/* ioctl failed: */
if (returnValue != 0)
{
fprintf(stdout,"Cannot get device settings");
return -1;
}

/* and a bit of nifty printf-s for the human eye :-) */
switch (ecmd.speed)
{
case SPEED_10:
{
fprintf(stdout,"Speed: 10Mbp/s ");
break;
}
case SPEED_100:
{
fprintf(stdout,"Speed: 100Mbp/s ");
break;
}
case SPEED_1000:
{
fprintf(stdout,"Speed: 1Gbp/s ");
break;
}
case SPEED_10000:
{
fprintf(stdout,"Speed: 10Gbp/s ");
break;
}
default:
{
fprintf(stdout,"Speed reading faulty ");
break;
}
}


switch (ecmd.duplex)
{
case DUPLEX_FULL:
{
fprintf(stdout," Full Duplex\n");
break;
}
case DUPLEX_HALF:
{
fprintf(stdout," Half Duplex\n");
break;
}
default:
{
fprintf(stdout," Duplex reading faulty\n");
break;
}
}

return 0;

}

int main(void)
{
GetEthSpeed("eth0");
}