prior to commit
e68c51ac46a9f273927aef8dcebc89912ab19ece, h_errno was
actually an external data object not a macro. bring back the symbol,
and use it as the storage for the main thread's h_errno.
technically this still doesn't provide full compatibility if the
application was multithreaded, but at the time there were no res_*
functions (and they did not set h_errno anyway), so any use of h_errno
would have been via thread-unsafe functions. thus a solution that just
fixes single-threaded applications seems acceptable.
#include <netdb.h>
#include "pthread_impl.h"
+#undef h_errno
+int h_errno;
+
int *__h_errno_location(void)
{
+ if (!__pthread_self()->stack) return &h_errno;
return &__pthread_self()->h_errno_val;
}