Linux环境下通过c代码获取本机IP

//接下来一个一个的获取IP地址
ifreq = (struct ifreq*)buf;
for(i=(ifconf.ifc_len/sizeof(struct ifreq)); i>0; i–)
{
ip = inet_ntoa(((struct sockaddr_in*)&(ifreq->ifr_addr))->sin_addr);
if(strcmp(ip，”127.0.0.1″)==0)  //排除127.0.0.1，继续下一个
{
ifreq++;
continue;
}
strcpy(outip，ip);
return 0;
}
return -1;
}
#include <stdio.h>
#include <unistd.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <linux/if.h>
long getlocalhostip ()
{
int MAXINTERFACES = 16;
long ip;
int fd， intrface， retn = 0;
struct ifreq buf[MAXINTERFACES];
struct ifconf ifc;
ip = -1;
if ((fd = socket (AF_INET， SOCK_DGRAM， 0)) >= 0) {
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = (caddr_t) buf;
if (!ioctl (fd， SIOCGIFCONF， (char *) &ifc)) {
intrface = ifc.ifc_len / sizeof (struct ifreq);
while (intrface-- > 0) {
if (!(ioctl (fd， SIOCGIFADDR， (char *) &buf[intrface]))) {
ip = inet_addr (inet_ntoa (((struct sockaddr_in *) (&buf[intrface].ifr_addr))->sin_addr));
break;
}
}
}
close (fd);
}
return ip;
}
union ipu
{
long ip;
unsigned char ipchar[4];
};
int main (int argc， char **argv)
{
union ipu localip;
localip.ip = getlocalhostip ();
printf ("local ip:%x :%u.%u.%u.%u "， localip.ip， localip.ipchar[0]， localip.ipchar[1]， localip.ipchar[2]， localip.ipchar[3]);
return 0;
}