C/C++，2个小项目

#include <stdio.h> #include <sys/types.h> #include <net/if.h> #include <netinet/in.h> #include <sys/socket.h> #include <linux/sockios.h> #include <sys/ioctl.h> #include <arpa/inet.h> int main(void) { int s; struct ifconf conf; struct ifreq *ifr; char buff[BUFSIZ]; int num; int i; s = socket(PF_INET, SOCK_DGRAM, 0); conf.ifc_len = BUFSIZ; conf.ifc_buf = buff; ioctl(s, SIOCGIFCONF, &conf); num = conf.ifc_len / sizeof(struct ifreq); ifr = conf.ifc_req; for(i=0;i < num;i++) { struct sockaddr_in *sin = (struct sockaddr_in *)(&ifr->ifr_addr); ioctl(s, SIOCGIFFLAGS, ifr); if(((ifr->ifr_flags & IFF_LOOPBACK) == 0) && (ifr->ifr_flags & IFF_UP)) { printf("%s (%s)\n", ifr->ifr_name, inet_ntoa(sin->sin_addr)); } ifr++; } }