check_snmp: add timeout handler befor running snmpget

plugins/check_snmp.c

@@ -33,6 +33,7 @@ const char *copyright = "1999-2007";
 const char *email = "nagiosplug-devel@lists.sourceforge.net";
 
 #include "common.h"
+#include "runcmd.h"
 #include "utils.h"
 #include "utils_cmd.h"
 
@@ -330,9 +331,18 @@ main (int argc, char **argv)
 	if (verbose)
 		printf ("%s\n", cl_hidden_auth);
 
+	/* Set signal handling and alarm */
+	if (signal (SIGALRM, runcmd_timeout_alarm_handler) == SIG_ERR) {
+		usage4 (_("Cannot catch SIGALRM"));
+	}
+	alarm(timeout_interval * retries + 5);
+
 	/* Run the command */
 	return_code = cmd_run_array (command_line, &chld_out, &chld_err, 0);
 
+	/* disable alarm again */
+	alarm(0);
+
 	/* Due to net-snmp sometimes showing stderr messages with poorly formed MIBs,
 	   only return state unknown if return code is non zero or there is no stdout.
 	   Do this way so that if there is stderr, will get added to output, which helps problem diagnosis