1 files changed, 14 insertions, 0 deletions

diff --git a/plugins/common.h b/plugins/common.h
index 6bf4fca..0f08e2f 100644
--- a/plugins/common.h
+++ b/plugins/common.h
@@ -225,4 +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_ */