check_procs: filter out self by /proc/pid/exe

Make check_procs filter out itself in the process list by comparing the
file pointed to by /proc/pid/exe. On platforms where this is not
available or when check_procs is passed the -T flag, the old behaviour
(check whether PID equals getpid()) is retained.

This fixes some false alarms when e.g. Nagios has, for whatever reasons,
some backlog of checks to run and check_procs with -a is called more
than once in a short time, matching its sister process.

1 files changed, 6 insertions, 0 deletions

diff --git a/configure.in b/configure.in
index 43fe4ade..7efcb0f9 100644
--- a/configure.in
+++ b/configure.in
@@ -1632,6 +1632,12 @@ if test -n "$ac_cv_proc_meminfo"; then
         EXTRAS="$EXTRAS check_swap"
 fi
 
+AC_MSG_CHECKING([for /proc/pid/exe])
+if [readlink /proc/$$/exe > /dev/null 2>&1]; then
+    AC_MSG_RESULT([found])
+    AC_DEFINE(HAVE_PROC_PID_EXE,1,[Define if we have /proc/pid/exe])
+fi
+
 AC_PATH_PROG(PATH_TO_DIG,dig)
 AC_ARG_WITH(dig_command,
             ACX_HELP_STRING([--with-dig-command=PATH],