libstatgrab: fix sg_get_user_stats() invocation for libstatgrab >= 0.9

In those versions, `sg_get_user_stats()` need to be invoked with an
additional argument. The need for such an argument is detected at
configure-time.

Fixes: #445

diff --git a/configure.ac b/configure.ac
index 35f8946..f1873de 100644 (file)
--- a/configure.ac
+++ b/configure.ac
@@ -4101,6 +4101,22 @@ then
           )
   )
 
+  AC_CACHE_CHECK([if sg_get_user_stats() requires an argument],
+          [c_cv_have_libstatgrab_get_user_stats_arg],
+          AC_LINK_IFELSE([AC_LANG_PROGRAM(
+[[[
+#include <stdio.h>
+#include <statgrab.h>
+]]],
+[[[
+      if (sg_get_user_stats()) return 0;
+]]]
+    )],
+    [c_cv_have_libstatgrab_get_user_stats_arg="no"],
+    [c_cv_have_libstatgrab_get_user_stats_arg="yes"]
+          )
+  )
+
   CFLAGS="$SAVE_CFLAGS"
   LDFLAGS="$SAVE_LDFLAGS"
 fi
@@ -4117,6 +4133,10 @@ then
   then
         AC_DEFINE(HAVE_LIBSTATGRAB_INIT_ARG, 1, [Define to 1 if sg_init does require an argument])
   fi
+  if test "x$c_cv_have_libstatgrab_get_user_stats_arg" = "xyes"
+  then
+        AC_DEFINE(HAVE_LIBSTATGRAB_GET_USER_STATS_ARG, 1, [Define to 1 if sg_get_user_stats does require an argument])
+  fi
 fi
 # }}}
 

diff --git a/src/users.c b/src/users.c
index 781e778..40ffece 100644 (file)
--- a/src/users.c
+++ b/src/users.c
@@ -102,11 +102,21 @@ static int users_read (void)
 #elif HAVE_LIBSTATGRAB
        sg_user_stats *us;
 
+# if HAVE_LIBSTATGRAB_GET_USER_STATS_ARG
+       size_t num_entries;
+       us = sg_get_user_stats (&num_entries);
+# else
        us = sg_get_user_stats ();
+# endif
        if (us == NULL)
                return (-1);   
 
-       users_submit ((gauge_t) us->num_entries);
+       users_submit ((gauge_t)
+# if HAVE_LIBSTATGRAB_GET_USER_STATS_ARG
+                     num_entries);
+# else
+                     us->num_entries);
+# endif
 /* #endif HAVE_LIBSTATGRAB */
 
 #else