Ubuntu 16.04下，可編譯通過：
1 #include <stdio.h>
2 #include <ifaddrs.h>
3 #include <arpa/inet.h>
4 #include <cstring>
5
6 #define MAX_LENGTH 254
7
8 int main(void) 9 { 10 char ipAddr[MAX_LENGTH]; 11
12 ipAddr[0] = '\0'; 13
14 struct ifaddrs * ifAddrStruct = NULL; 15 void * tmpAddrPtr = NULL; 16
17 if (getifaddrs(&ifAddrStruct) != 0) 18 { 19 //if wrong, go out!
20 printf("Somting is Wrong!\n"); 21 return -1; 22 } 23
24 struct ifaddrs * iter = ifAddrStruct; 25
26 while (iter != NULL) { 27 if (iter->ifa_addr->sa_family == AF_INET) { //if ip4 28 // is a valid IP4 Address
29 tmpAddrPtr = &((struct sockaddr_in *)iter->ifa_addr)->sin_addr; 30 char addressBuffer[INET_ADDRSTRLEN]; 31 inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN); 32 if (strlen(ipAddr) + strlen(addressBuffer) < MAX_LENGTH - 1) 33 { 34 if (strlen(ipAddr) > 0) 35 { 36 strcat(ipAddr, ";"); 37 } 38 strcat(ipAddr, addressBuffer); 39 } 40 else
41 { 42 printf("Too many ips!\n"); 43 break; 44 } 45 } 46 //else if (ifaddrstruct->ifa_addr->sa_family == af_inet6) { // check it is ip6
47
48 /* deal ip6 addr */
49 // tmpaddrptr = &((struct sockaddr_in *)ifaddrstruct->ifa_addr)->sin_addr; 50 // char addressbuffer[inet6_addrstrlen]; 51 // inet_ntop(af_inet6, tmpaddrptr, addressbuffer, inet6_addrstrlen); 52
53 //}
54 iter = iter->ifa_next; 55 } 56 //releas the struct
57 freeifaddrs(ifAddrStruct); 58
59 printf("The ips: %s\n", ipAddr); 60
61 return 0; 62 }
效果：
