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-rw-r--r--udevtrigger.c354
1 files changed, 354 insertions, 0 deletions
diff --git a/udevtrigger.c b/udevtrigger.c
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--- /dev/null
+++ b/udevtrigger.c
@@ -0,0 +1,354 @@
+/*
+ * udevtrigger.c
+ *
+ * Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
+ * Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
+ *
+ * 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 version 2 of the License.
+ *
+ * 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, write to the Free Software Foundation, Inc.,
+ * 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdlib.h>
+#include <stddef.h>
+#include <string.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <dirent.h>
+#include <fcntl.h>
+#include <syslog.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+
+#include "udev.h"
+
+static const char *udev_log_str;
+static int verbose;
+static int dry_run;
+
+#ifdef USE_LOG
+void log_message(int priority, const char *format, ...)
+{
+ va_list args;
+
+ if (priority > udev_log_priority)
+ return;
+
+ va_start(args, format);
+ vsyslog(priority, format, args);
+ va_end(args);
+}
+#endif
+
+/* list of devices that we should run last due to any one of a number of reasons */
+static char *last_list[] = {
+ "/class/block/md",
+ "/class/block/dm-",
+ "/block/md",
+ "/block/dm-",
+ NULL
+};
+
+/* list of devices that we should run first due to any one of a number of reasons */
+static char *first_list[] = {
+ "/class/mem",
+ "/class/tty",
+ NULL
+};
+
+LIST_HEAD(device_first_list);
+LIST_HEAD(device_default_list);
+LIST_HEAD(device_last_list);
+
+static int device_list_insert(const char *path)
+{
+ struct list_head *device_list = &device_default_list;
+ int i;
+
+ for (i = 0; first_list[i] != NULL; i++) {
+ if (strncmp(path, first_list[i], strlen(first_list[i])) == 0) {
+ device_list = &device_first_list;
+ break;
+ }
+ }
+ for (i = 0; last_list[i] != NULL; i++) {
+ if (strncmp(path, last_list[i], strlen(last_list[i])) == 0) {
+ device_list = &device_last_list;
+ break;
+ }
+ }
+
+ dbg("add '%s'" , path);
+ /* double entries will be ignored */
+ name_list_add(device_list, path, 0);
+ return 0;
+}
+
+static void trigger_uevent(const char *path)
+{
+ char filename[PATH_SIZE];
+ int fd;
+
+ strlcpy(filename, path, sizeof(filename));
+ strlcat(filename, "/uevent", sizeof(filename));
+
+ if (verbose)
+ printf("%s\n", path);
+
+ if (dry_run)
+ return;
+
+ fd = open(filename, O_WRONLY);
+ if (fd < 0) {
+ dbg("error on opening %s: %s\n", filename, strerror(errno));
+ return;
+ }
+
+ if (write(fd, "add", 3) < 0)
+ info("error on triggering %s: %s\n", filename, strerror(errno));
+
+ close(fd);
+}
+
+static void exec_lists(void)
+{
+ struct name_entry *loop_device;
+ struct name_entry *tmp_device;
+
+ /* handle the devices on the "first" list first */
+ list_for_each_entry_safe(loop_device, tmp_device, &device_first_list, node) {
+ trigger_uevent(loop_device->name);
+ list_del(&loop_device->node);
+ free(loop_device);
+ }
+
+ /* handle the devices on the "default" list next */
+ list_for_each_entry_safe(loop_device, tmp_device, &device_default_list, node) {
+ trigger_uevent(loop_device->name);
+ list_del(&loop_device->node);
+ free(loop_device);
+ }
+
+ /* handle devices on the "last" list, if any */
+ list_for_each_entry_safe(loop_device, tmp_device, &device_last_list, node) {
+ trigger_uevent(loop_device->name);
+ list_del(&loop_device->node);
+ free(loop_device);
+ }
+}
+
+static int is_device(const char *path)
+{
+ char filename[PATH_SIZE];
+ struct stat statbuf;
+
+ /* look for the uevent file of the kobject */
+ strlcpy(filename, path, sizeof(filename));
+ strlcat(filename, "/uevent", sizeof(filename));
+ if (stat(filename, &statbuf) < 0)
+ return 0;
+
+ if (!(statbuf.st_mode & S_IWUSR))
+ return 0;
+
+ return 1;
+}
+
+static void udev_scan_bus(void)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+
+ strlcpy(base, sysfs_path, sizeof(base));
+ strlcat(base, "/bus", sizeof(base));
+
+ dir = opendir(base);
+ if (dir != NULL) {
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ char dirname[PATH_SIZE];
+ DIR *dir2;
+ struct dirent *dent2;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ strlcpy(dirname, base, sizeof(dirname));
+ strlcat(dirname, "/", sizeof(dirname));
+ strlcat(dirname, dent->d_name, sizeof(dirname));
+ strlcat(dirname, "/devices", sizeof(dirname));
+
+ /* look for devices */
+ dir2 = opendir(dirname);
+ if (dir2 != NULL) {
+ for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+ char dirname2[PATH_SIZE];
+
+ if (dent2->d_name[0] == '.')
+ continue;
+
+ strlcpy(dirname2, dirname, sizeof(dirname2));
+ strlcat(dirname2, "/", sizeof(dirname2));
+ strlcat(dirname2, dent2->d_name, sizeof(dirname2));
+
+ if (is_device(dirname2))
+ device_list_insert(dirname2);
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+}
+
+static void udev_scan_block(void)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+ struct stat statbuf;
+
+ /* skip if "block" is already a "class" */
+ strlcpy(base, sysfs_path, sizeof(base));
+ strlcat(base, "/class/block", sizeof(base));
+ if (stat(base, &statbuf) == 0)
+ return;
+
+ strlcpy(base, sysfs_path, sizeof(base));
+ strlcat(base, "/block", sizeof(base));
+
+ dir = opendir(base);
+ if (dir != NULL) {
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ char dirname[PATH_SIZE];
+ DIR *dir2;
+ struct dirent *dent2;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ strlcpy(dirname, base, sizeof(dirname));
+ strlcat(dirname, "/", sizeof(dirname));
+ strlcat(dirname, dent->d_name, sizeof(dirname));
+ if (is_device(dirname))
+ device_list_insert(dirname);
+ else
+ continue;
+
+ /* look for partitions */
+ dir2 = opendir(dirname);
+ if (dir2 != NULL) {
+ for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+ char dirname2[PATH_SIZE];
+
+ if (dent2->d_name[0] == '.')
+ continue;
+
+ if (!strcmp(dent2->d_name,"device"))
+ continue;
+
+ strlcpy(dirname2, dirname, sizeof(dirname2));
+ strlcat(dirname2, "/", sizeof(dirname2));
+ strlcat(dirname2, dent2->d_name, sizeof(dirname2));
+ if (is_device(dirname2))
+ device_list_insert(dirname2);
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+}
+
+static void udev_scan_class(void)
+{
+ char base[PATH_SIZE];
+ DIR *dir;
+ struct dirent *dent;
+
+ strlcpy(base, sysfs_path, sizeof(base));
+ strlcat(base, "/class", sizeof(base));
+
+ dir = opendir(base);
+ if (dir != NULL) {
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ char dirname[PATH_SIZE];
+ DIR *dir2;
+ struct dirent *dent2;
+
+ if (dent->d_name[0] == '.')
+ continue;
+
+ strlcpy(dirname, base, sizeof(dirname));
+ strlcat(dirname, "/", sizeof(dirname));
+ strlcat(dirname, dent->d_name, sizeof(dirname));
+ dir2 = opendir(dirname);
+ if (dir2 != NULL) {
+ for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+ char dirname2[PATH_SIZE];
+
+ if (dent2->d_name[0] == '.')
+ continue;
+
+ if (!strcmp(dent2->d_name, "device"))
+ continue;
+
+ strlcpy(dirname2, dirname, sizeof(dirname2));
+ strlcat(dirname2, "/", sizeof(dirname2));
+ strlcat(dirname2, dent2->d_name, sizeof(dirname2));
+ if (is_device(dirname2))
+ device_list_insert(dirname2);
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+}
+
+int main(int argc, char *argv[], char *envp[])
+{
+ int i;
+
+ logging_init("udevtrigger");
+ udev_config_init();
+ dbg("version %s", UDEV_VERSION);
+
+ udev_log_str = getenv("UDEV_LOG");
+
+ for (i = 1 ; i < argc; i++) {
+ char *arg = argv[i];
+
+ if (strcmp(arg, "--verbose") == 0 || strcmp(arg, "-v") == 0)
+ verbose = 1;
+ else if (strcmp(arg, "--dry-run") == 0 || strcmp(arg, "-n") == 0)
+ dry_run = 1;
+ else {
+ fprintf(stderr, "Usage: udevtrigger [--verbose] [--dry-run]\n");
+ goto exit;
+ }
+ }
+
+ sysfs_init();
+
+ udev_scan_bus();
+ udev_scan_class();
+ udev_scan_block();
+ exec_lists();
+
+ sysfs_cleanup();
+exit:
+ logging_close();
+ return 0;
+}
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