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authorRichard Yao <ryao@gentoo.org>2012-11-19 15:09:40 -0500
committerRichard Yao <ryao@cs.stonybrook.edu>2012-11-23 01:55:23 -0500
commit135d61df6f66d0c0e67aec62f76ee7f2a409a3ce (patch)
tree4106807f267d3116b81c1508868f36d2f51f7443 /src/udev/udev-builtin-kmod.c
parent9b996818cb6eacaaecaaa9bae8d0377fa1fdb803 (diff)
Reintroduce blkid-kmod
This opens the door to using disabling the use of kmod from autotools. Signed-off-by: Richard Yao <ryao@gentoo.org>
Diffstat (limited to 'src/udev/udev-builtin-kmod.c')
-rw-r--r--src/udev/udev-builtin-kmod.c134
1 files changed, 134 insertions, 0 deletions
diff --git a/src/udev/udev-builtin-kmod.c b/src/udev/udev-builtin-kmod.c
new file mode 100644
index 0000000000..17aca2944d
--- /dev/null
+++ b/src/udev/udev-builtin-kmod.c
@@ -0,0 +1,134 @@
+/*
+ * load kernel modules
+ *
+ * Copyright (C) 2011-2012 Kay Sievers <kay@vrfy.org>
+ * Copyright (C) 2011 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 <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <string.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/wait.h>
+#include <libkmod.h>
+
+#include "udev.h"
+
+static struct kmod_ctx *ctx;
+
+static int load_module(struct udev *udev, const char *alias)
+{
+ struct kmod_list *list = NULL;
+ struct kmod_list *l;
+ int err;
+
+ err = kmod_module_new_from_lookup(ctx, alias, &list);
+ if (err < 0)
+ return err;
+
+ if (list == NULL)
+ log_debug("no module matches '%s'\n", alias);
+
+ kmod_list_foreach(l, list) {
+ struct kmod_module *mod = kmod_module_get_module(l);
+
+ err = kmod_module_probe_insert_module(mod, KMOD_PROBE_APPLY_BLACKLIST, NULL, NULL, NULL, NULL);
+ if (err == KMOD_PROBE_APPLY_BLACKLIST)
+ log_debug("module '%s' is blacklisted\n", kmod_module_get_name(mod));
+ else if (err == 0)
+ log_debug("inserted '%s'\n", kmod_module_get_name(mod));
+ else
+ log_debug("failed to insert '%s'\n", kmod_module_get_name(mod));
+
+ kmod_module_unref(mod);
+ }
+
+ kmod_module_unref_list(list);
+ return err;
+}
+
+static void udev_kmod_log(void *data, int priority, const char *file, int line,
+ const char *fn, const char *format, va_list args)
+{
+ udev_main_log(data, priority, file, line, fn, format, args);
+}
+
+static int builtin_kmod(struct udev_device *dev, int argc, char *argv[], bool test)
+{
+ struct udev *udev = udev_device_get_udev(dev);
+ int i;
+
+ if (!ctx)
+ return 0;
+
+ if (argc < 3 || strcmp(argv[1], "load")) {
+ log_error("expect: %s load <module>\n", argv[0]);
+ return EXIT_FAILURE;
+ }
+
+ for (i = 2; argv[i]; i++) {
+ log_debug("execute '%s' '%s'\n", argv[1], argv[i]);
+ load_module(udev, argv[i]);
+ }
+
+ return EXIT_SUCCESS;
+}
+
+/* called at udev startup and reload */
+static int builtin_kmod_init(struct udev *udev)
+{
+ if (ctx)
+ return 0;
+
+ ctx = kmod_new(NULL, NULL);
+ if (!ctx)
+ return -ENOMEM;
+
+ log_debug("load module index\n");
+ kmod_set_log_fn(ctx, udev_kmod_log, udev);
+ kmod_load_resources(ctx);
+ return 0;
+}
+
+/* called on udev shutdown and reload request */
+static void builtin_kmod_exit(struct udev *udev)
+{
+ log_debug("unload module index\n");
+ ctx = kmod_unref(ctx);
+}
+
+/* called every couple of seconds during event activity; 'true' if config has changed */
+static bool builtin_kmod_validate(struct udev *udev)
+{
+ log_debug("validate module index\n");
+ if (!ctx)
+ return false;
+ return (kmod_validate_resources(ctx) != KMOD_RESOURCES_OK);
+}
+
+const struct udev_builtin udev_builtin_kmod = {
+ .name = "kmod",
+ .cmd = builtin_kmod,
+ .init = builtin_kmod_init,
+ .exit = builtin_kmod_exit,
+ .validate = builtin_kmod_validate,
+ .help = "kernel module loader",
+ .run_once = false,
+};