QNX RTOS v4 Knowledge Base
QNX RTOS v4 Knowledge Base
| Title |
Getting MAC address from a C program |
| Ref. No. |
QNX.000009830 |
| Category(ies) |
Network, Development |
| Issue |
Is there a way to obtain the Ethernet address of a NIC card programatically from within a C program? If so, how?
|
| Solution |
Use the following source code:
/* find my mac address */
#include <stdio.h>
#include <malloc.h>
#include <sys/kernel.h>
#include <sys/net_nq.h>
#include <sys/net41msg.h>
#include <sys/net_drvr.h>
#include <errno.h>
void main()
{
int ctr;
int pid;
struct _net_rnodemap rnodemap;
char data[1024];
struct _net_rnodemap_reply *rnodemap_reply;
int nids[20];
if ((pid=qnx_vc_name_attach(0, 64, "qnx/net"))==-1 {
printf ("Could not attach to Net (%d)n", errno);
exit(0);
}
memset (&rnodemap, 0, sizeof(rnodemap));
rnodemap.type=_NET_RNODEMAP;
rnodemap.log_nid=getnid();
rnodemap_reply=(struct _net_rnodemap_reply *) data;
if ((Send(pid, &rnodemap, rnodemap_reply, sizeof(rnodemap), 1000))==-1) {
printf ("Send errorn");
exit(0);
}
printf ("MAC: "); // if you have multiple cards you will need a loop here
for (ctr=0; ctr<6; ctr++)
printf ("%02x", rnodemap_reply->card[0].phys_addr[ctr]);
printf ("n");
}
The sys/net_nq.h, sys/net41msg.h, and sys/net_drvr.h include files can be found in the /qnx/os/net/netraw.v4.tgz in our free software section.
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