C语言获取本机ip

一、参考网址

　　1、c语言获取本机IP

二、源码

 #include <stdio.h>
 #include <stdint.h>
 #include <stdlib.h>
 #include <stdarg.h>
 #include <time.h>
 #include <sys/time.h>
 #include <pthread.h>
 #include <netinet/in.h>
 #include <arpa/inet.h>
 #include <sys/socket.h>
 #include <netdb.h>
 #include <signal.h>
 #include <sys/types.h>
 #include <unistd.h>
 #include <ctype.h>
 #include <ifaddrs.h>
 #include <string.h>
 #include <assert.h>
 #include <poll.h>
 #include <errno.h>

 static char *getip()
 {
     struct ifaddrs *ifaddr, *ifa;
     int family, s;
     char *host = NULL;

     if (getifaddrs(&ifaddr) == -) {
         perror("getifaddrs");
         return NULL;
     }

     for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
         if (ifa->ifa_addr == NULL)
             continue;

         family = ifa->ifa_addr->sa_family;

         if (!strcmp(ifa->ifa_name, "lo"))
             continue;
         if (family == AF_INET) {
             if ((host = malloc(NI_MAXHOST)) == NULL)
                 return NULL;
             s = getnameinfo(ifa->ifa_addr,
                     (family == AF_INET) ? sizeof(struct sockaddr_in) :
                     sizeof(struct sockaddr_in6),
                     host, NI_MAXHOST, NULL, , NI_NUMERICHOST);
             if (s != ) {
                 return NULL;
             }
             freeifaddrs(ifaddr);
             return host;
         }
     }
     return NULL;
 }