make: config -- Add test for prlimit call

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

Makefile.config

@@ -9,6 +9,9 @@ $(CONFIG): scripts/utilities.mak scripts/feature-tests.mak
 	$(Q) @echo '#define __CR_CONFIG_H__' >> $@
 ifeq ($(call try-cc,$(TCP_REPAIR_TEST),,),y)
 	$(Q) @echo '#define CONFIG_HAS_TCP_REPAIR' >> $@
+endif
+ifeq ($(call try-cc,$(PRLIMIT_TEST),,),y)
+	$(Q) @echo '#define CONFIG_HAS_PRLIMIT' >> $@
 endif
 	$(Q) @echo '#endif /* __CR_CONFIG_H__ */' >> $@
 

scripts/feature-tests.mak

@@ -11,3 +11,21 @@ int main(void)
 	return opts.opt_val;
 }
 endef
+
+define PRLIMIT_TEST
+
+#include <stdlib.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/resource.h>
+
+int main(void)
+{
+	struct rlimit limit = {
+		.rlim_cur = RLIM_INFINITY,
+		.rlim_max = RLIM_INFINITY,
+	};
+
+	return prlimit(getpid(), RLIMIT_CPU, &limit, NULL);
+}
+endef