1 files changed, 26 insertions, 0 deletions

diff --git a/plugins/common.h b/plugins/common.h
index 01003b3b..0f08e2f6 100644
--- a/plugins/common.h
+++ b/plugins/common.h
@@ -161,12 +161,24 @@
 #  endif
 #endif
 
+/* openssl 1.1 does not set OPENSSL_NO_SSL2 by default but ships without ssl2 */
+#ifdef OPENSSL_VERSION_NUMBER
+#  if OPENSSL_VERSION_NUMBER >= 0x10100000
+#   define OPENSSL_NO_SSL2
+#  endif
+#endif
+
 /*
  *
  * Standard Values
  *
  */
 
+/* MariaDB 10.2 client does not set MYSQL_PORT */
+#ifndef MYSQL_PORT
+#  define MYSQL_PORT 3306
+#endif
+
 enum {
         OK = 0,
         ERROR = -1
@@ -213,4 +225,18 @@ enum {
 # define __attribute__(x) /* do nothing */
 #endif
 
+/* Try sysconf(_SC_OPEN_MAX) first, as it can be higher than OPEN_MAX.
+ * If that fails and the macro isn't defined, we fall back to an educated
+ * guess. There's no guarantee that our guess is adequate and the program
+ * will die with SIGSEGV if it isn't and the upper boundary is breached. */
+#define DEFAULT_MAXFD  256   /* fallback value if no max open files value is set */
+#define MAXFD_LIMIT   8192   /* upper limit of open files */
+#ifdef _SC_OPEN_MAX
+static long maxfd = 0;
+#elif defined(OPEN_MAX)
+# define maxfd OPEN_MAX
+#else   /* sysconf macro unavailable, so guess (may be wildly inaccurate) */
+# define maxfd DEFAULT_MAXFD
+#endif
+
 #endif /* _COMMON_H_ */