fix maxfd being zero

If _SC_OPEN_MAX is available then maxfd was zero initialized and never set to the value from sysconf.
This leads to segfaults with free(): invalid size introduced by commit 7cafb0e84550035fe671662c293122be975065ca.

Signed-off-by: Sven Nierlein <sven@nierlein.de>

1 files changed, 16 insertions, 0 deletions

diff --git a/plugins/utils.c b/plugins/utils.c
index ee620133..348ec022 100644
--- a/plugins/utils.c
+++ b/plugins/utils.c
@@ -678,3 +678,19 @@ char *sperfdata_int (const char *label,
 
         return data;
 }
+
+int
+open_max (void)
+{
+        errno = 0;
+        if (maxfd > 0)
+                return(maxfd);
+
+        if ((maxfd = sysconf (_SC_OPEN_MAX)) < 0) {
+                if (errno == 0)
+                        maxfd = DEFAULT_MAXFD;   /* it's indeterminate */
+        else
+                die (STATE_UNKNOWN, _("sysconf error for _SC_OPEN_MAX\n"));
+        }
+        return(maxfd);
+}