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linux获取主机名后用gethostbyname() 不能获取主机ip
来源: 互联网 发布时间:2017-03-20
本文导语: 我在虚拟机上用以下函数能获取主机ip的ip char hostname[256]; if (gethostname(hostname, 256) == 0) { printf("localhost name:%sn",hostname); struct hostent* hostinfo = gethostbyname(hostname); client_value->localip =(uint32_t)((struct in_addr*)hostin...
我在虚拟机上用以下函数能获取主机ip的ip
char hostname[256];
if (gethostname(hostname, 256) == 0)
{
printf("localhost name:%sn",hostname);
struct hostent* hostinfo = gethostbyname(hostname);
client_value->localip =(uint32_t)((struct in_addr*)hostinfo->h_addr_list[0])->s_addr;
printf("client_value->localip=%dn",client_value->localip);
}
但是用交叉编译器编译后放到我arm板上就不行能获取主机名但是不是获取ip,提示段错误;
我在arm板的操作终端输入命令hostname -s会显示主机名 +unknown server error ,在虚拟机下输入该命令就只显示主机名
哪位高手帮忙指导指导arm板应该怎么设置啊
char hostname[256];
if (gethostname(hostname, 256) == 0)
{
printf("localhost name:%sn",hostname);
struct hostent* hostinfo = gethostbyname(hostname);
client_value->localip =(uint32_t)((struct in_addr*)hostinfo->h_addr_list[0])->s_addr;
printf("client_value->localip=%dn",client_value->localip);
}
但是用交叉编译器编译后放到我arm板上就不行能获取主机名但是不是获取ip,提示段错误;
我在arm板的操作终端输入命令hostname -s会显示主机名 +unknown server error ,在虚拟机下输入该命令就只显示主机名
哪位高手帮忙指导指导arm板应该怎么设置啊
|
获取本机IP,你可以用:
gethostname() gethostbyname()在Linux不好用!
char* getlocalhostip ()
{
int MAXINTERFACES=16;
char *ip=NULL;
int fd, intrface, retn = 0;
struct ifreq buf[MAXINTERFACES]; ///if.h
struct ifconf ifc; ///if.h
if ((fd = socket (AF_INET, SOCK_DGRAM, 0)) >= 0) //socket.h
{
ifc.ifc_len = sizeof buf;
ifc.ifc_buf = (caddr_t) buf;
if (!ioctl (fd, SIOCGIFCONF, (char *) &ifc)) //ioctl.h
{
intrface = ifc.ifc_len / sizeof (struct ifreq);
while (intrface-->0)
{
if (!(ioctl (fd, SIOCGIFADDR, (char *) &buf[intrface])))
{
ip=(inet_ntoa(((struct sockaddr_in*)(&buf[intrface].ifr_addr))->sin_addr));//types
break;
}
}
}
close (fd);
}
return ip;
}
gethostname() gethostbyname()在Linux不好用!