一、参考网址
1、c语言获取本机IP
二、源码
1 #include <stdio.h>
2 #include <stdint.h>
3 #include <stdlib.h>
4 #include <stdarg.h>
5 #include <time.h>
6 #include <sys/time.h>
7 #include <pthread.h>
8 #include <netinet/in.h>
9 #include <arpa/inet.h>
10 #include <sys/socket.h>
11 #include <netdb.h>
12 #include <signal.h>
13 #include <sys/types.h>
14 #include <unistd.h>
15 #include <ctype.h>
16 #include <ifaddrs.h>
17 #include <string.h>
18 #include <assert.h>
19 #include <poll.h>
20 #include <errno.h>
21
22 static char *getip()
23 {
24 struct ifaddrs *ifaddr, *ifa;
25 int family, s;
26 char *host = NULL;
27
28 if (getifaddrs(&ifaddr) == -1) {
29 perror("getifaddrs");
30 return NULL;
31 }
32
33 for (ifa = ifaddr; ifa != NULL; ifa = ifa->ifa_next) {
34 if (ifa->ifa_addr == NULL)
35 continue;
36
37 family = ifa->ifa_addr->sa_family;
38
39 if (!strcmp(ifa->ifa_name, "lo"))
40 continue;
41 if (family == AF_INET) {
42 if ((host = malloc(NI_MAXHOST)) == NULL)
43 return NULL;
44 s = getnameinfo(ifa->ifa_addr,
45 (family == AF_INET) ? sizeof(struct sockaddr_in) :
46 sizeof(struct sockaddr_in6),
47 host, NI_MAXHOST, NULL, 0, NI_NUMERICHOST);
48 if (s != 0) {
49 return NULL;
50 }
51 freeifaddrs(ifaddr);
52 return host;
53 }
54 }
55 return NULL;
56 }
