#include <stdio.h>
#include <string.h> /* for strncpy */
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/ioctl.h>
#include <netinet/in.h>
#include <net/if.h>
int
main()
{
int fd;
struct ifreq ifr;
fd = socket(AF_INET, SOCK_DGRAM, 0);
/* I want to get an IPv4 IP address */
ifr.ifr_addr.sa_family = AF_INET;
/* I want IP address attached to "eth0" */
strncpy(ifr.ifr_name, "eth0", IFNAMSIZ-1);
ioctl(fd, SIOCGIFADDR, &ifr);
close(fd);
/* display result */
char* ipaddr;
ipaddr = inet_ntoa(((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr);
printf("%s\n", ipaddr);
return 0;
}
这条线分段错误:为INET_NTOA
ipaddr = inet_ntoa(((struct sockaddr_in *)&(ifr.ifr_addr))->sin_addr);
我得到
iptry.c: In function ‘main’:
iptry.c:31:9: warning: assignment makes pointer from integer without a cast [enabled by default]
和
printf("%s\n", ipaddr);
我得到段错误。
有什么不对呢?
,'inet_ntoa'在头''定义,也许你需要'#include'那? –
Petesh
2013-03-26 11:26:32
你还得到一个_implicit函数declaration_ warning吗? – hmjd 2013-03-26 11:26:44
隐式函数声明是什么意思? – user138126 2013-03-26 12:04:43