summaryrefslogtreecommitdiff
path: root/udev_start.c
diff options
context:
space:
mode:
Diffstat (limited to 'udev_start.c')
-rw-r--r--udev_start.c300
1 files changed, 300 insertions, 0 deletions
diff --git a/udev_start.c b/udev_start.c
new file mode 100644
index 0000000000..c1d877fb37
--- /dev/null
+++ b/udev_start.c
@@ -0,0 +1,300 @@
+/*
+ * udevstart.c
+ *
+ * Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
+ *
+ * Quick and dirty way to populate a /dev with udev if your system
+ * does not have access to a shell. Based originally on a patch to udev
+ * from Harald Hoyer <harald@redhat.com>
+ *
+ * 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 <errno.h>
+#include <ctype.h>
+#include <dirent.h>
+#include <sys/wait.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+#include "libsysfs/sysfs/libsysfs.h"
+#include "logging.h"
+#include "udev_lib.h"
+#include "list.h"
+#include "udev.h"
+
+
+#define MAX_PATHLEN 1024
+#define SYSBLOCK "/sys/block"
+#define SYSCLASS "/sys/class"
+
+struct device {
+ struct list_head list;
+ char path[MAX_PATHLEN];
+ char subsys[MAX_PATHLEN];
+};
+
+/* sort files in lexical order */
+static int device_list_insert(char *path, char *subsystem, struct list_head *device_list)
+{
+ struct device *loop_device;
+ struct device *new_device;
+
+ list_for_each_entry(loop_device, device_list, list) {
+ if (strcmp(loop_device->path, path) > 0) {
+ break;
+ }
+ }
+
+ new_device = malloc(sizeof(struct device));
+ if (new_device == NULL) {
+ dbg("error malloc");
+ return -ENOMEM;
+ }
+
+ strfieldcpy(new_device->path, path);
+ strfieldcpy(new_device->subsys, subsystem);
+ list_add_tail(&new_device->list, &loop_device->list);
+ dbg("add '%s' from subsys '%s'", new_device->path, new_device->subsys);
+ return 0;
+}
+
+/* list of devices that we should run last due to any one of a number of reasons */
+static char *last_list[] = {
+ "/block/dm", /* on here because dm wants to have the block devices around before it */
+ NULL,
+};
+
+/* list of devices that we should run first due to any one of a number of reasons */
+static char *first_list[] = {
+ "/class/mem", /* people tend to like their memory devices around first... */
+ NULL,
+};
+
+static int add_device(char *devpath, char *subsystem)
+{
+ struct udevice udev;
+ char path[SYSFS_PATH_MAX];
+ struct sysfs_class_device *class_dev;
+
+ /* set environment for callouts and dev.d/ */
+ setenv("DEVPATH", devpath, 1);
+ setenv("SUBSYSTEM", subsystem, 1);
+
+ snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, devpath);
+ path[SYSFS_PATH_MAX-1] = '\0';
+ class_dev = sysfs_open_class_device_path(path);
+ if (class_dev == NULL) {
+ dbg ("sysfs_open_class_device_path failed");
+ return -ENODEV;
+ }
+
+ udev_set_values(&udev, devpath, subsystem, "add");
+ udev_add_device(&udev, class_dev);
+
+ /* run dev.d/ scripts if we created a node or changed a netif name */
+ if (udev.devname[0] != '\0') {
+ setenv("DEVNAME", udev.devname, 1);
+ dev_d_execute(&udev, DEVD_DIR, DEVD_SUFFIX);
+ }
+
+ sysfs_close_class_device(class_dev);
+
+ return 0;
+}
+
+static void exec_list(struct list_head *device_list)
+{
+ struct device *loop_device;
+ struct device *tmp_device;
+ int i;
+
+ /* handle the "first" type devices first */
+ list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
+ for (i=0; first_list[i] != NULL; i++) {
+ if (strncmp(loop_device->path, first_list[i], strlen(first_list[i])) == 0) {
+ add_device(loop_device->path, loop_device->subsys);
+ list_del(&loop_device->list);
+ free(loop_device);
+ break;
+ }
+ }
+ }
+
+ /* handle the devices we are allowed to, excluding the "last" type devices */
+ list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
+ int found = 0;
+ for (i=0; last_list[i] != NULL; i++) {
+ if (strncmp(loop_device->path, last_list[i], strlen(last_list[i])) == 0) {
+ found = 1;
+ break;
+ }
+ }
+ if (found)
+ continue;
+
+ add_device(loop_device->path, loop_device->subsys);
+ list_del(&loop_device->list);
+ free(loop_device);
+ }
+
+ /* handle the rest of the devices left over, if any */
+ list_for_each_entry_safe(loop_device, tmp_device, device_list, list) {
+ add_device(loop_device->path, loop_device->subsys);
+ list_del(&loop_device->list);
+ free(loop_device);
+ }
+}
+
+static void udev_scan_block(void)
+{
+ DIR *dir;
+ struct dirent *dent;
+ LIST_HEAD(device_list);
+
+ dir = opendir(SYSBLOCK);
+ if (dir != NULL) {
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ char dirname[MAX_PATHLEN];
+ DIR *dir2;
+ struct dirent *dent2;
+
+ if ((strcmp(dent->d_name, ".") == 0) ||
+ (strcmp(dent->d_name, "..") == 0))
+ continue;
+
+ snprintf(dirname, MAX_PATHLEN, "/block/%s", dent->d_name);
+ dirname[MAX_PATHLEN-1] = '\0';
+ device_list_insert(dirname, "block", &device_list);
+
+ snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSBLOCK, dent->d_name);
+ dir2 = opendir(dirname);
+ if (dir2 != NULL) {
+ for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+ char dirname2[MAX_PATHLEN];
+ DIR *dir3;
+ struct dirent *dent3;
+
+ if ((strcmp(dent2->d_name, ".") == 0) ||
+ (strcmp(dent2->d_name, "..") == 0))
+ continue;
+
+ snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
+ dirname2[MAX_PATHLEN-1] = '\0';
+
+ dir3 = opendir(dirname2);
+ if (dir3 != NULL) {
+ for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
+ char filename[MAX_PATHLEN];
+
+ if (strcmp(dent3->d_name, "dev") == 0) {
+ snprintf(filename, MAX_PATHLEN, "/block/%s/%s",
+ dent->d_name, dent2->d_name);
+ filename[MAX_PATHLEN-1] = '\0';
+ device_list_insert(filename, "block", &device_list);
+ }
+ }
+ closedir(dir3);
+ }
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+
+ exec_list(&device_list);
+}
+
+static void udev_scan_class(void)
+{
+ DIR *dir;
+ struct dirent *dent;
+ LIST_HEAD(device_list);
+
+ dir = opendir(SYSCLASS);
+ if (dir != NULL) {
+ for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
+ char dirname[MAX_PATHLEN];
+ DIR *dir2;
+ struct dirent *dent2;
+
+ if ((strcmp(dent->d_name, ".") == 0) ||
+ (strcmp(dent->d_name, "..") == 0))
+ continue;
+
+ snprintf(dirname, MAX_PATHLEN, "%s/%s", SYSCLASS, dent->d_name);
+ dirname[MAX_PATHLEN-1] = '\0';
+ dir2 = opendir(dirname);
+ if (dir2 != NULL) {
+ for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
+ char dirname2[MAX_PATHLEN];
+ DIR *dir3;
+ struct dirent *dent3;
+
+ if ((strcmp(dent2->d_name, ".") == 0) ||
+ (strcmp(dent2->d_name, "..") == 0))
+ continue;
+
+ /* pass the net class as it is */
+ if (strcmp(dent->d_name, "net") == 0) {
+ snprintf(dirname2, MAX_PATHLEN, "/class/net/%s", dent2->d_name);
+ device_list_insert(dirname2, "net", &device_list);
+ continue;
+ }
+
+ snprintf(dirname2, MAX_PATHLEN, "%s/%s", dirname, dent2->d_name);
+ dirname2[MAX_PATHLEN-1] = '\0';
+ dir3 = opendir(dirname2);
+ if (dir3 != NULL) {
+ for (dent3 = readdir(dir3); dent3 != NULL; dent3 = readdir(dir3)) {
+ char filename[MAX_PATHLEN];
+
+ /* pass devices with a "dev" file */
+ if (strcmp(dent3->d_name, "dev") == 0) {
+ snprintf(filename, MAX_PATHLEN, "/class/%s/%s",
+ dent->d_name, dent2->d_name);
+ filename[MAX_PATHLEN-1] = '\0';
+ device_list_insert(filename, dent->d_name, &device_list);
+ break;
+ }
+ }
+ closedir(dir3);
+ }
+ }
+ closedir(dir2);
+ }
+ }
+ closedir(dir);
+ }
+
+ exec_list(&device_list);
+}
+
+int udev_start(void)
+{
+ /* set environment for callouts and dev.d/ */
+ setenv("ACTION", "add", 1);
+ setenv("UDEVSTART", "1", 1);
+
+ udev_scan_class();
+ udev_scan_block();
+
+ return 0;
+}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-24 05:24:01 +0000