Add binary to test rmmod feature

It doesn't run with `make check' since
	o It's dangerous
	o It needs to be run as root
	o It needs an argument, otherwise it removes the first module
	  with use_count==0

Makefile.am

@@ -45,9 +45,13 @@ pkgconfig_DATA = libkmod/libkmod.pc
 
 TESTS = test/test-init test/test-loaded
 
-check_PROGRAMS = test/test-init test/test-loaded
+check_PROGRAMS = test/test-init test/test-loaded test/test-rmmod
 test_test_init_SOURCES = test/test-init.c
 test_test_init_LDADD = libkmod/libkmod.la
 
 test_test_loaded_SOURCES = test/test-loaded.c
 test_test_loaded_LDADD = libkmod/libkmod.la
+
+noinst_PROGRAMS = test/test-rmmod $(check_PROGRAMS)
+test_test_rmmod_SOURCES = test/test-rmmod.c
+test_test_rmmod_LDADD = libkmod/libkmod.la

test/.gitignore

@@ -1,3 +1,4 @@
 .dirstamp
 test-init
 test-loaded
+test-rmmod

test/test-rmmod.c

@@ -0,0 +1,57 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stddef.h>
+#include <errno.h>
+#include <unistd.h>
+#include <inttypes.h>
+#include <string.h>
+#include <libkmod.h>
+
+
+int main(int argc, char *argv[])
+{
+	const char *modname = NULL;
+	struct kmod_ctx *ctx;
+	struct kmod_loaded *mod;
+	struct kmod_list *list, *itr;
+	int err;
+
+	if (argc == 2)
+		modname = argv[1];
+
+	ctx = kmod_new();
+	if (ctx == NULL)
+		exit(EXIT_FAILURE);
+
+	printf("libkmod version %s\n", VERSION);
+
+	err = kmod_loaded_new(ctx, &mod);
+	if (err < 0)
+		exit(EXIT_FAILURE);
+
+	err = kmod_loaded_get_list(mod, &list);
+	if (err < 0) {
+		fprintf(stderr, "%s\n", strerror(-err));
+		exit(EXIT_FAILURE);
+	}
+
+	kmod_list_foreach(itr, list) {
+		const char *name;
+		int use_count;
+
+		kmod_loaded_get_module_info(itr, &name, NULL, &use_count,
+								NULL, NULL);
+
+		if ((modname && !strcmp(modname, name)) ||
+					(modname == NULL && use_count == 0)) {
+			printf("Trying to remove '%s'\n", name);
+			kmod_loaded_remove_module(mod, itr, 0);
+			break;
+		}
+	}
+
+	kmod_loaded_unref(mod);
+	kmod_unref(ctx);
+
+	return EXIT_SUCCESS;
+}