/* * udev-add.c * * Userspace devfs * * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.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 <string.h> #include <stdio.h> #include <fcntl.h> #include <unistd.h> #include <errno.h> #include "udev.h" #include "udev_version.h" #include "namedev.h" #include "udevdb.h" #include "libsysfs/libsysfs.h" /* * 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) { int retval = -ENODEV; char *dev; dev = sysfs_get_value_from_attributes(class_dev->directory->attributes, "dev"); if (dev == NULL) goto exit; dbg("dev = %s", dev); if (sscanf(dev, "%u:%u", major, minor) != 2) goto exit; dbg("found major = %d, minor = %d", *major, *minor); retval = 0; exit: return retval; } /* * 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 filename[255]; int retval = 0; strncpy(filename, UDEV_ROOT, sizeof(filename)); strncat(filename, name, sizeof(filename)); switch (type) { case 'b': mode |= S_IFBLK; break; case 'c': case 'u': mode |= S_IFCHR; break; case 'p': mode |= S_IFIFO; break; default: dbg("unknown node type %c\n", type); return -EINVAL; } retval = mknod(filename,mode,makedev(major,minor)); if (retval) dbg("mknod(%s, %#o, %u, %u) failed with error '%s'", filename, mode, major, minor, strerror(errno)); return retval; } struct sysfs_class_device *get_class_dev(char *device_name) { char sysfs_path[SYSFS_PATH_MAX]; char dev_path[SYSFS_PATH_MAX]; int retval; struct sysfs_class_device *class_dev = NULL; retval = sysfs_get_mnt_path(sysfs_path, SYSFS_PATH_MAX); dbg("sysfs_path = %s", sysfs_path); if (retval) { dbg("sysfs_get_mnt_path failed"); goto exit; } 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"); goto exit; } dbg("class_dev->name = %s", class_dev->name); exit: return class_dev; } int udev_add_device(char *device, char *subsystem) { struct sysfs_class_device *class_dev; struct device_attr attr; struct udevice dbdev; int major; int minor; char type; 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'; /* sleep for a second or two to give the kernel a chance to * create the dev file */ sleep(1); 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; } memset(&dbdev, 0, sizeof(dbdev)); strncpy(dbdev.name, attr.name, NAME_SIZE); strncpy(dbdev.sysfs_path, class_dev->sysdevice->directory->path, PATH_SIZE); strncpy(dbdev.class_dev_name, class_dev->name, NAME_SIZE); if ((sysfs_get_name_from_path(subsystem, dbdev.class_name, NAME_SIZE)) != 0) strcpy(dbdev.class_name, "unkown"); strncpy(dbdev.bus_id, class_dev->sysdevice->bus_id, ID_SIZE); strcpy(dbdev.bus_name, "unknown"); if (class_dev->driver != NULL) strncpy(dbdev.driver, class_dev->driver->name, NAME_SIZE); else strcpy(dbdev.driver, "unkown"); dbdev.type = type; dbdev.major = major; dbdev.minor = minor; dbdev.mode = attr.mode; sysfs_close_class_device(class_dev); retval = udevdb_add_udevice(&dbdev); if (retval != 0) goto exit; return create_node(attr.name, type, major, minor, attr.mode); exit: return retval; }