Module: monitoring-plugins
Branch: master
Commit: 0162cb2d4f7040e3b2d48095182f87ce565866a5
Author: RincewindsHat <12514511+rincewinds...@users.noreply.github.com>
Committer: Lorenz Kästle <lorenz.kaes...@netways.de>
Date: Sun Mar 5 16:03:37 2023 +0100
URL:
https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=0162cb2
fixup! Rework maxfd/open_max to avoid unused variables
---
lib/maxfd.c | 26 ++++++++++++++++++++++++++
lib/maxfd.h | 9 +++++++++
2 files changed, 35 insertions(+)
diff --git a/lib/maxfd.c b/lib/maxfd.c
new file mode 100644
index 0000000..dcd4d3d
--- /dev/null
+++ b/lib/maxfd.c
@@ -0,0 +1,26 @@
+#include "./maxfd.h"
+#include <errno.h>
+
+long open_max (void) {
+ long maxfd = 0L;
+ /* 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. */
+
+#ifdef _SC_OPEN_MAX
+ errno = 0;
+ 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"));
+ }
+#elif defined(OPEN_MAX)
+ return OPEN_MAX
+#else /* sysconf macro unavailable, so guess (may be wildly inaccurate) */
+ return DEFAULT_MAXFD;
+#endif
+
+ return(maxfd);
+}
diff --git a/lib/maxfd.h b/lib/maxfd.h
new file mode 100644
index 0000000..0d734c5
--- /dev/null
+++ b/lib/maxfd.h
@@ -0,0 +1,9 @@
+#ifndef _MAXFD_
+#define _MAXFD_
+
+#define DEFAULT_MAXFD 256 /* fallback value if no max open files value is
set */
+#define MAXFD_LIMIT 8192 /* upper limit of open files */
+
+long open_max (void);
+
+#endif // _MAXFD_
