tools: add basic versions of insert and remove

1 files changed, 150 insertions, 0 deletions

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",
+};