Linux下检测网络状态是否正常

// Linux下检测网络状态是否正常#include <sys/types.h>#include <string.h>#include <stdlib.h>#include <sys/ioctl.h>#include <stdio.h>#include <errno.h>#include <net/if.h>struct ethtool_value { __uint32_t cmd; __uint32_t data;};int main(int argc, char* argv[]){ struct ethtool_value edata; int fd = -1, err = 0; struct ifreq ifr; memset(&ifr, 0, sizeof(ifr)); strcpy(ifr.ifr_name, “eth0”); fd = socket(AF_INET, SOCK_DGRAM, 0); if (fd < 0) { perror(“Cannot get control socket”); return 70; } edata.cmd = 0x0000000a; ifr.ifr_data = (caddr_t)&edata; err = ioctl(fd, 0x8946, &ifr); if (err == 0) { fprintf(stdout, “Link detected: %s/n”, edata.data ? “yes”:”no”); } else if (errno != EOPNOTSUPP) { perror(“Cannot get link status”); } return 0;}

环境不会改变，解决之道在于改变自己。