#include "libsysfs/libsysfs.h"
-static char sysfs_path[SYSFS_PATH_MAX];
-
static char *get_action(void)
{
char *action;
return device;
}
-/*
- * Right now the major/minor of a device is stored in a file called
- * "dev" in sysfs.
- * The number is stored as:
- * MMmm
- * MM is the major
- * mm is the minor
- * The value is in hex.
- * Yes, this will probably change when we go to a bigger major/minor
- * range, and will have to be changed at that time.
- */
-static int get_major_minor(struct sysfs_class_device *class_dev, int *major, int *minor)
-{
- char temp[3];
- int retval = 0;
-
- char *dev;
-
- dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev");
- if (dev == NULL)
- return -ENODEV;
-
- dbg("dev = %s", dev);
-
- temp[0] = dev[0];
- temp[1] = dev[1];
- temp[2] = 0x00;
- *major = (int)strtol(&temp[0], NULL, 16);
-
- temp[0] = dev[2];
- temp[1] = dev[3];
- temp[2] = 0x00;
- *minor = (int)strtol(&temp[0], NULL, 16);
-
- dbg("found major = %d, minor = %d", *major, *minor);
-
- retval = 0;
- return retval;
-}
-
-/*
- * Here would go a call to the naming deamon, to get the name we want to have
- * for this device. But for now, let's just default to whatever the kernel is
- * calling the device as that will keep the "old-style" naming policy
- */
-static char *get_name(char *dev, int major, int minor)
-{
- static char name[100];
- char *temp;
-
- temp = strrchr(dev, '/');
- if (temp == NULL)
- return NULL;
- strncpy(name, &temp[1], sizeof(name));
-
- dbg("name is %s", name);
-
- return &name[0];
-}
-
-/*
- * We also want to add some permissions here, and possibly some symlinks
- */
-static int create_node(char *name, char type, int major, int minor, int mode)
-{
- char *argv[7];
- char mode_string[100];
- char type_string[3];
- char major_string[20];
- char minor_string[20];
- char filename[255];
- int retval = 0;
-
- strncpy(filename, UDEV_ROOT, sizeof(filename));
- strncat(filename, name, sizeof(filename));
-
- snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
- snprintf(type_string, sizeof(type_string), "%c", type);
- snprintf(major_string, sizeof(major_string), "%d", major);
- snprintf(minor_string, sizeof(minor_string), "%d", minor);
-
- argv[0] = MKNOD;
- argv[1] = mode_string;
- argv[2] = filename;
- argv[3] = type_string;
- argv[4] = major_string;
- argv[5] = minor_string;
- argv[6] = NULL;
- dbg ("executing %s %s %s %s %s %s",
- argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
- switch (fork()) {
- case 0:
- /* we are the child, so lets run the program */
- execv (MKNOD, argv);
- exit(0);
- break;
- case (-1):
- dbg ("fork failed.");
- retval = -EFAULT;
- break;
- default:
- break;
- }
- return retval;
-}
-
-/*
- * We also want to clean up any symlinks that were created in create_node()
- */
-static int delete_node(char *name)
-{
- char filename[255];
-
- strncpy(filename, UDEV_ROOT, sizeof(filename));
- strncat(filename, name, sizeof(filename));
-
- dbg("unlinking %s", filename);
- return unlink(filename);
-}
-
-struct sysfs_class_device *get_class_dev(char *device_name)
-{
- char dev_path[SYSFS_PATH_MAX];
- struct sysfs_class_device *class_dev;
-
- strcpy(dev_path, sysfs_path);
- strcat(dev_path, device_name);
-
- dbg("looking at %s", dev_path);
-
- /* open up the sysfs class device for this thing... */
- class_dev = sysfs_open_class_device(dev_path);
- if (class_dev == NULL) {
- dbg ("sysfs_open_class_device failed");
- return NULL;
- }
- dbg("class_dev->name = %s", class_dev->name);
-
- return class_dev;
-}
-
-static int add_device(char *device, char *subsystem)
-{
- struct sysfs_class_device *class_dev;
- struct device_attr attr;
- //char *name;
- int major;
- int minor;
- char type;
- //int mode;
- int retval = -EINVAL;
-
- /* for now, the block layer is the only place where block devices are */
- if (strcmp(subsystem, "block") == 0)
- type = 'b';
- else
- type = 'c';
-
- class_dev = get_class_dev(device);
- if (class_dev == NULL)
- goto exit;
-
- retval = namedev_name_device(class_dev, &attr);
- if (retval)
- return retval;
-
- retval = get_major_minor(class_dev, &major, &minor);
- if (retval) {
- dbg ("get_major_minor failed");
- goto exit;
- }
-
- sysfs_close_class_device(class_dev);
-
- return create_node(attr.name, type, major, minor, attr.mode);
-
-exit:
- return retval;
-}
-
-static int remove_device(char *device)
-{
- char *name;
- int retval = 0;
-
- name = get_name(device, 0, 0);
- if (name == NULL) {
- dbg ("get_name failed");
- retval = -ENODEV;
- goto exit;
- }
-
- return delete_node(name);
-
-exit:
- return retval;
-}
-
-static int udev_init(void)
-{
- int retval;
-
- retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX);
- dbg("sysfs_path = %s", sysfs_path);
- return retval;
-}
-
int main(int argc, char *argv[])
{
char *action;
char *device;
+ char *subsystem;
int retval = -EINVAL;
if (argc != 2) {
goto exit;
}
+ subsystem = argv[1];
+
device = get_device();
if (!device) {
dbg ("no device?");
dbg("not block or class");
goto exit;
}
-
- /* sleep for a second or two to give the kernel a chance to
- * create the dev file
- */
- sleep(1);
- udev_init();
- namedev_init();
+ /* but we don't care about net class devices */
+ if (strcmp(subsystem, "net") == 0) {
+ dbg("don't care about net devices");
+ goto exit;
+ }
action = get_action();
if (!action) {
goto exit;
}
+ /* initialize the naming deamon */
+ namedev_init();
+
if (strcmp(action, "add") == 0)
- return add_device(device, argv[1]);
+ return udev_add_device(device, argv[1]);
if (strcmp(action, "remove") == 0)
- return remove_device(device);
+ return udev_remove_device(device, argv[1]);
dbg("Unknown action: %s", action);
- return -EINVAL;
+ retval = -EINVAL;
- retval = 0;
exit:
return retval;
}
~ianmdlvl / elogind.git / blobdiff