cryptlib.c: allow application to override OPENSSL_isservice.

PR: 2194

diff --git a/crypto/cryptlib.c b/crypto/cryptlib.c
index 62bc495d3dd8318beee1b6dc793e3d3d7b6af466..af1dbfb81d7ecaa091044cda15eeb94363db3e04 100644 (file)
--- a/crypto/cryptlib.c
+++ b/crypto/cryptlib.c
@@ -762,6 +762,18 @@ int OPENSSL_isservice(void)
 { HWINSTA h;
   DWORD len;
   WCHAR *name;
+  static union { void *p; int (*f)(void); } _OPENSSL_isservice = { NULL };
+
+    if (_OPENSSL_isservice.p == NULL) {
+       HANDLE h = GetModuleHandle(NULL);
+       if (h != NULL)
+           _OPENSSL_isservice.p = GetProcAddress(h,"_OPENSSL_isservice");
+       if (_OPENSSL_isservice.p == NULL)
+           _OPENSSL_isservice.p = (void *)-1;
+    }
+
+    if (_OPENSSL_isservice.p != (void *)-1)
+       return (*_OPENSSL_isservice.f)();
 
     (void)GetDesktopWindow(); /* return value is ignored */