I encountered the following code snapshot:
struct hostent *hp; hp = my_gethostbyname(localhost); if (hp == NULL) { ls_syslog(LOG_ERR, I18N_FUNC_FAIL, fname, "my_gethostbyname()"); return -1; } strcpy(localhost, hp->h_name); memcpy(&addr, hp->h_addr, hp->h_length);
I am rather confused by the last statement, the declaration of struct hostent is like this:
struct hostent { char *h_name; /* official name of host */ char **h_aliases; /* alias list */ int h_addrtype; /* host address type */ int h_length; /* length of address */ char **h_addr_list; /* list of addresses */ };
It doesn’t have a field named “h_addr”, but the code did can compile, can anyone tell me why? thanks.
Advertisement
Answer
You missed this bit right under it:
#define h_addr h_addr_list[0] /* for backward compatibility */
So no, there is no problem.