about memory leak when I call gethostbyname at platform Redhat Linux 7.2

[Gu Jian]

emergence problem! I need your help! Platfrom Rredhat Linux 7.2, I called the system function gethostbyname, then I used memory leak tools(mtrace and valgrind) to trace memory leak, I found the gethostbyname having a memory leak. I can use command "man freehostent", but I can not use, the gcc compiler told me the function "freehostent" not found. What can I do? My example source as follow : #include <stdlib.h> #include <stdio.h> #include <string.h> #include <mcheck.h> #include <arpa/inet.h> #include <sys/types.h> #include <sys/socket.h> typedef unsigned int u_int32; char serv[2][256]={{"192.168.1.168"},{"ntp.psh.com.cn"}}; int main(int argc, char *argv[]) {  mtrace();  u_int32 num;  //unsigned int32;  struct hostent *hp;  if ((hp = gethostbyname(serv[1]) ) != 0) {   memmove((char *)&num, hp->h_addr, sizeof(u_int32));   printf("OK\n");  }  //freehostent(hp);  return 1; }   best regards! Firmstone Zhang