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#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <netinet/in.h>
/*
* open a socket, get the process group information of the socket, and use the
* socket to get the network interface configuration list
*/
main()
{
int sock;
int ioctl_result;
/* get a socket */
sock = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP);
if (sock < 0)
{
perror("Cannot create socket");
exit(1);
}
/* use ioctl() to get the process group information */
{
int get_process_group;
ioctl_result = ioctl(sock, SIOCGPGRP, (char *) &get_process_group);
if (ioctl_result < 0)
{
int my_errno = errno;
fprintf(stderr, "errno %d ", my_errno);
perror("ioctl(get process group)");
}
}
/* use ioctl() to get the interface configuration list */
{
static struct ifconf ifc; /* init to 0 */
ioctl_result = ioctl(sock, SIOCGIFCONF, (char *) &ifc);
if (ioctl_result < 0)
{
int my_errno = errno;
fprintf(stderr, "errno %d ", my_errno);
perror("ioctl(get interface configuration list)");
}
}
}
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