linux获取hostname和获取ip

1.获取hostname

char host[MAX_HOST_NAME];
gethostname(host, MAX_HOST_NAME - 1); //Get host name
string hostName(host);

2.获取ip

#include       
#include 
#include 
#include  
#include  
#include 

int main (int argc, const char * argv[]) {
    struct ifaddrs * ifAddrStruct=NULL;
    void * tmpAddrPtr=NULL;

    getifaddrs(&ifAddrStruct);

    while (ifAddrStruct!=NULL) {
        if (ifAddrStruct->ifa_addr->sa_family==AF_INET) { // check it is IP4
            // is a valid IP4 Address
            tmpAddrPtr=&((struct sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr;
            char addressBuffer[INET_ADDRSTRLEN];
            inet_ntop(AF_INET, tmpAddrPtr, addressBuffer, INET_ADDRSTRLEN);
            printf("%s IP Address %s\n", ifAddrStruct->ifa_name, addressBuffer); 
        } 
	else if (ifAddrStruct->ifa_addr->sa_family==AF_INET6) { // check it is IP6
            // is a valid IP6 Address
            tmpAddrPtr=&((struct sockaddr_in *)ifAddrStruct->ifa_addr)->sin_addr;
            char addressBuffer[INET6_ADDRSTRLEN];
            inet_ntop(AF_INET6, tmpAddrPtr, addressBuffer, INET6_ADDRSTRLEN);
            printf("%s IP Address %s\n", ifAddrStruct->ifa_name, addressBuffer); 
        } 

        ifAddrStruct=ifAddrStruct->ifa_next;
    }
    return 0;
}