How do I find the current machine's full hostname in C (hostname and domain information)?

Question

In a C project (POSIX), how do I get the fully qualified name for the current system?

For example, I can get just the hostname of my machine by doing gethostna

Answer 1

My solution:

#ifdef WIN32
    #include 
    #include 
#else
    #include 
#endif

void GetMachineName(char machineName[150])
{
    char Name[150];
    int i=0;

    #ifdef WIN32
        TCHAR infoBuf[150];
        DWORD bufCharCount = 150;
        memset(Name, 0, 150);
        if( GetComputerName( infoBuf, &bufCharCount ) )
        {
            for(i=0; i<150; i++)
            {
                Name[i] = infoBuf[i];
            }
        }
        else
        {
            strcpy(Name, "Unknown_Host_Name");
        }
    #else
        memset(Name, 0, 150);
        gethostname(Name, 150);
    #endif
    strncpy(machineName,Name, 150);
}