tools: add basic versions of insert and remove
diff --git a/tools/remove.c b/tools/remove.c
new file mode 100644
index 0000000..07e2cc0
--- /dev/null
+++ b/tools/remove.c
@@ -0,0 +1,150 @@
+/*
+ * kmod-remove - remove modules from the kernel.
+ *
+ * Copyright (C) 2015 Intel Corporation. All rights reserved.
+ * Copyright (C) 2011-2013 ProFUSION embedded systems
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <errno.h>
+#include <getopt.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libkmod/libkmod.h>
+
+#include "kmod.h"
+
+static const char cmdopts_s[] = "h";
+static const struct option cmdopts[] = {
+ {"help", no_argument, 0, 'h'},
+ { }
+};
+
+static void help(void)
+{
+ printf("Usage:\n"
+ "\t%s remove [options] module\n"
+ "Options:\n"
+ "\t-h, --help show this help\n",
+ program_invocation_short_name);
+}
+
+static int check_module_inuse(struct kmod_module *mod) {
+ struct kmod_list *holders;
+ int state;
+
+ state = kmod_module_get_initstate(mod);
+
+ if (state == KMOD_MODULE_BUILTIN) {
+ ERR("Module %s is builtin.\n", kmod_module_get_name(mod));
+ return -ENOENT;
+ } else if (state < 0) {
+ ERR("Module %s is not currently loaded\n",
+ kmod_module_get_name(mod));
+ return -ENOENT;
+ }
+
+ holders = kmod_module_get_holders(mod);
+ if (holders != NULL) {
+ struct kmod_list *itr;
+
+ ERR("Module %s is in use by:", kmod_module_get_name(mod));
+
+ kmod_list_foreach(itr, holders) {
+ struct kmod_module *hm = kmod_module_get_module(itr);
+ fprintf(stderr, " %s", kmod_module_get_name(hm));
+ kmod_module_unref(hm);
+ }
+ fputc('\n', stderr);
+
+ kmod_module_unref_list(holders);
+ return -EBUSY;
+ }
+
+ if (kmod_module_get_refcnt(mod) != 0) {
+ ERR("Module %s is in use\n", kmod_module_get_name(mod));
+ return -EBUSY;
+ }
+
+ return 0;
+}
+
+static int do_remove(int argc, char *argv[])
+{
+ struct kmod_ctx *ctx;
+ struct kmod_module *mod;
+ const char *name;
+ int err, r = EXIT_SUCCESS;
+
+ for (;;) {
+ int c, idx =0;
+ c = getopt_long(argc, argv, cmdopts_s, cmdopts, &idx);
+ if (c == -1)
+ break;
+ switch (c) {
+ case 'h':
+ help();
+ return EXIT_SUCCESS;
+
+ default:
+ ERR("Unexpected getopt_long() value '%c'.\n", c);
+ return EXIT_FAILURE;
+ }
+ }
+
+ if (optind >= argc) {
+ ERR("Missing module name\n");
+ return EXIT_FAILURE;
+ }
+
+ ctx = kmod_new(NULL, NULL);
+ if (!ctx) {
+ ERR("kmod_new() failed!\n");
+ return EXIT_FAILURE;
+ }
+
+ name = argv[optind];
+ err = kmod_module_new_from_name(ctx, name, &mod);
+ if (err < 0) {
+ ERR("Could not remove module %s: %s\n", name, strerror(-err));
+ goto end;
+ }
+
+ err = check_module_inuse(mod);
+ if (err < 0)
+ goto unref;
+
+ err = kmod_module_remove_module(mod, 0);
+ if (err < 0)
+ goto unref;
+
+unref:
+ kmod_module_unref(mod);
+
+end:
+ kmod_unref(ctx);
+ if (err < 0) {
+ r = EXIT_FAILURE;
+ ERR("Could not remove module %s: %s\n", name, strerror(-err));
+ }
+ return r;
+}
+
+const struct kmod_cmd kmod_cmd_remove = {
+ .name = "remove",
+ .cmd = do_remove,
+ .help = "remove module from kernel",
+};