linux获取hostname和获取ip

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1.获取hostname

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

2.获取ip

#include <stdio.h>      #include <sys/types.h>#include <ifaddrs.h>#include <netinet/in.h> #include <string.h> #include <arpa/inet.h>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;}

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