[monitoring-plugins] Don't let check_disk hang on hanging filesystems

[Holger Weiss]

    Module: monitoring-plugins
    Branch: check-disk-thread
    Commit: 170feea0b3cf02f9ef90b86babfba86e31af6595
    Author: Gerhard Lausser <lausser at users.sourceforge.net>
 Committer: Holger Weiss <holger at zedat.fu-berlin.de>
      Date: Tue Oct  1 08:57:10 2013 +0200
       URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=170feea

Don't let check_disk hang on hanging filesystems

---

 configure.ac         | 12 ++++++++++++
 plugins/Makefile.am  |  2 +-
 plugins/check_disk.c | 40 ++++++++++++++++++++++++++++++++++++++++
 3 files changed, 53 insertions(+), 1 deletion(-)

diff --git a/configure.ac b/configure.ac
index 59875e5..6dacd4f 100644
--- a/configure.ac
+++ b/configure.ac
@@ -544,6 +544,18 @@ else
 	with_gnutls="no"
 fi
 
+dnl Check for POSIX thread libraries
+AC_CHECK_HEADERS(pthread.h)
+case $host in
+	*sun* | *solaris*)
+		AC_CHECK_LIB(pthread,pthread_create,THRLIBS="-lpthread -lrt")
+	;;
+	*)
+		AC_CHECK_LIB(pthread,pthread_create,THRLIBS="-lpthread")
+	;;
+esac
+AC_SUBST(THRLIBS)
+
 dnl
 dnl Checks for header files.
 dnl
diff --git a/plugins/Makefile.am b/plugins/Makefile.am
index 0ddf9bd..2618394 100644
--- a/plugins/Makefile.am
+++ b/plugins/Makefile.am
@@ -71,7 +71,7 @@ check_apt_LDADD = $(BASEOBJS)
 check_cluster_LDADD = $(BASEOBJS)
 check_dbi_LDADD = $(NETLIBS) $(DBILIBS)
 check_dig_LDADD = $(NETLIBS)
-check_disk_LDADD = $(BASEOBJS)
+check_disk_LDADD = $(BASEOBJS) $(THRLIBS)
 check_dns_LDADD = $(NETLIBS)
 check_dummy_LDADD = $(BASEOBJS)
 check_fping_LDADD = $(NETLIBS)
diff --git a/plugins/check_disk.c b/plugins/check_disk.c
index 0d73a4f..a66aaf0 100644
--- a/plugins/check_disk.c
+++ b/plugins/check_disk.c
@@ -51,6 +51,9 @@ const char *email = "devel at monitoring-plugins.org";
 # include <limits.h>
 #endif
 #include "regex.h"
+#if HAVE_PTHREAD_H
+# include <pthread.h>
+#endif
 
 #ifdef __CYGWIN__
 # include <windows.h>
@@ -130,6 +133,7 @@ void print_help (void);
 void print_usage (void);
 double calculate_percent(uintmax_t, uintmax_t);
 void stat_path (struct parameter_list *p);
+void do_stat_path (struct parameter_list *p);
 void get_stats (struct parameter_list *p, struct fs_usage *fsp);
 void get_path_stats (struct parameter_list *p, struct fs_usage *fsp);
 
@@ -968,6 +972,42 @@ print_usage (void)
 void
 stat_path (struct parameter_list *p)
 {
+#ifdef HAVE_PTHREAD_H
+  pthread_t stat_thread;
+  int status;
+  int statdone = 0;
+  int timer = timeout_interval;
+  struct timespec req, rem;
+  req.tv_sec = 0;
+  pthread_create(&stat_thread, NULL, do_stat_path, p);
+  while (timer-- > 0) {
+    req.tv_nsec = 10000000;
+    nanosleep(&req, &rem);
+    if (pthread_kill(stat_thread, 0)) {
+      statdone = 1;
+      break;
+    } else {
+      req.tv_nsec = 990000000;
+      nanosleep(&req, &rem);
+    }
+  }
+  if (statdone == 1) {
+    pthread_join(stat_thread, (void *)&status);
+  } else {
+    pthread_detach(stat_thread);
+    if (verbose >= 3)
+      printf("stat did not return within %ds on %s\n", timeout_interval, p->name);
+    printf("DISK %s - ", _("CRITICAL"));
+    die (STATE_CRITICAL, _("%s %s: %s\n"), p->name, _("hangs"), _("Timeout"));
+  }
+#else
+  do_stat_path(p);
+#endif
+}
+
+void
+do_stat_path (struct parameter_list *p)
+{
   /* Stat entry to check that dir exists and is accessible */
   if (verbose >= 3)
     printf("calling stat on %s\n", p->name);