Fix bugs with DNS library on Windows

libc/calls/gethoststxtpath.c

@@ -23,6 +23,6 @@ const char *GetHostsTxtPath(char *path, size_t size) {
   if (!IsWindows()) {
     return "/etc/hosts";
   } else {
-    return GetSystemDirectoryPath(path, "drivers\\etc\\hosts", size);
+    return GetSystemDirectoryPath(path, "\\drivers\\etc\\hosts", size);
   }
 }

libc/calls/getprotocolstxtpath.c

@@ -23,6 +23,6 @@ const char *GetProtocolsTxtPath(char *buf, size_t size) {
   if (!IsWindows()) {
     return "/etc/protocols";
   } else {
-    return GetSystemDirectoryPath(buf, "drivers\\etc\\protocol", size);
+    return GetSystemDirectoryPath(buf, "\\drivers\\etc\\protocol", size);
   }
 }

libc/calls/getservicestxtpath.c

@@ -23,6 +23,6 @@ const char *GetServicesTxtPath(char *path, size_t size) {
   if (!IsWindows()) {
     return "/etc/services";
   } else {
-    return GetSystemDirectoryPath(path, "drivers\\etc\\services", size);
+    return GetSystemDirectoryPath(path, "\\drivers\\etc\\services", size);
   }
 }

libc/calls/sig.c

@@ -33,6 +33,7 @@
 #include "libc/intrin/describebacktrace.internal.h"
 #include "libc/intrin/dll.h"
 #include "libc/intrin/strace.internal.h"
+#include "libc/intrin/weaken.h"
 #include "libc/nt/console.h"
 #include "libc/nt/enum/context.h"
 #include "libc/nt/enum/exceptionhandleractions.h"
@@ -43,6 +44,7 @@
 #include "libc/nt/struct/ntexceptionpointers.h"
 #include "libc/nt/synchronization.h"
 #include "libc/nt/thread.h"
+#include "libc/runtime/symbols.internal.h"
 #include "libc/str/str.h"
 #include "libc/sysv/consts/sa.h"
 #include "libc/sysv/consts/sicode.h"
@@ -525,7 +527,9 @@ static void __sig_unmaskable(struct NtExceptionPointers *ep, int code, int sig,
   // otherwise it'll print a warning message about the lack of stack mem
   STRACE("win32 vectored exception 0x%08Xu raising %G "
          "cosmoaddr2line %s %lx %s",
-         ep->ExceptionRecord->ExceptionCode, sig, program_invocation_name,
+         ep->ExceptionRecord->ExceptionCode, sig,
+         _weaken(FindDebugBinary) ? _weaken(FindDebugBinary)()
+                                  : program_invocation_name,
          ep->ContextRecord->Rip,
          DescribeBacktrace((struct StackFrame *)ep->ContextRecord->Rbp));
 

libc/stdio/printargs.c

@@ -445,6 +445,9 @@ textstartup void __printargs(const char *prologue) {
   PRINT(" ☼ %s = %#s", "kNtWindowsDirectory", kNtWindowsDirectory);
 #endif
   PRINT(" ☼ %s = %#s", "__argv[0]", __argv[0]);
+  PRINT(" ☼ %s = %#s", "program_invocation_name", program_invocation_name);
+  PRINT(" ☼ %s = %#s", "program_invocation_short_name",
+        program_invocation_short_name);
   PRINT(" ☼ %s = %#s", "getenv(\"_\")", getenv("_"));
   PRINT(" ☼ %s = %#s", "getauxval(AT_EXECFN)", getauxval(AT_EXECFN));
   PRINT(" ☼ %s = %#s", "GetProgramExecutableName", GetProgramExecutableName());

third_party/musl/resolvconf.c

@@ -63,6 +63,7 @@ static dontinline textwindows int __get_resolv_conf_nt(struct resolvconf *conf)
 		return __winerr();
 	}
 
+	conf->nns = 0;
 	for (i = 0; i < keycount; ++i) {
 		char value8[128];
 		uint32_t valuebytes, uuidlen;