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