/* * 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 <sys/stat.h> #include <sys/types.h> #include <grp.h> #ifndef __KLIBC__ #include <pwd.h> #endif #include "udev.h" #include "udev_version.h" #include "namedev.h" #include "udevdb.h" #include "libsysfs/libsysfs.h" #include "klibc_fixups.h" /* * Right now the major/minor of a device is stored in a file called * "dev" in sysfs. * The number is stored as: * MM:mm * MM is the major * mm is the minor * The value is in decimal. */ static int get_major_minor(struct sysfs_class_device *class_dev, struct udevice *udev) { 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", &udev->major, &udev->minor) != 2) goto exit; dbg("found major=%d, minor=%d", udev->major, udev->minor); retval = 0; exit: return retval; } /* * we possibly want to add some symlinks here * only numeric owner/group id's are supported */ static int create_node(struct udevice *dev) { char filename[255]; int retval = 0; uid_t uid = 0; gid_t gid = 0; dev_t res; strncpy(filename, udev_root, sizeof(filename)); strncat(filename, dev->name, sizeof(filename)); #ifdef __KLIBC__ res = (dev->major << 8) | (dev->minor); #else res = makedev(dev->major, dev->minor); #endif switch (dev->type) { case 'b': dev->mode |= S_IFBLK; break; case 'c': case 'u': dev->mode |= S_IFCHR; break; case 'p': dev->mode |= S_IFIFO; break; default: dbg("unknown node type %c\n", dev->type); return -EINVAL; } /* create subdirectories if requested */ if (strchr(dev->name, '/')) { char path[255]; char *pos; struct stat stats; strncpy(path, filename, sizeof(path)); pos = strchr(path+1, '/'); while (1) { pos = strchr(pos+1, '/'); if (pos == NULL) break; *pos = 0x00; if (stat(path, &stats)) { retval = mkdir(path, 0755); if (retval) { dbg("mkdir(%s) failed with error '%s'", path, strerror(errno)); return retval; } dbg("created '%s'", path); } *pos = '/'; } } dbg("mknod(%s, %#o, %u, %u)", filename, dev->mode, dev->major, dev->minor); retval = mknod(filename, dev->mode, res); if (retval) dbg("mknod(%s, %#o, %u, %u) failed with error '%s'", filename, dev->mode, dev->major, dev->minor, strerror(errno)); dbg("chmod(%s, %#o)", filename, dev->mode); retval = chmod(filename, dev->mode); if (retval) dbg("chmod(%s, %#o) failed with error '%s'", filename, dev->mode, strerror(errno)); if (*dev->owner) { char *endptr; unsigned long id = strtoul(dev->owner, &endptr, 10); if (*endptr == 0x00) uid = (uid_t) id; else { struct passwd *pw = getpwnam(dev->owner); if (!pw) dbg("user unknown '%s'", dev->owner); else uid = pw->pw_uid; } } if (*dev->group) { char *endptr; unsigned long id = strtoul(dev->group, &endptr, 10); if (*endptr == 0x00) gid = (gid_t) id; else { struct group *gr = getgrnam(dev->group); if (!gr) dbg("group unknown '%s'", dev->group); else gid = gr->gr_gid; } } if (uid || gid) { dbg("chown(%s, %u, %u)", filename, uid, gid); retval = chown(filename, uid, gid); if (retval) dbg("chown(%s, %u, %u) failed with error '%s'", filename, uid, gid, strerror(errno)); } return retval; } static struct sysfs_class_device *get_class_dev(char *device_name) { char dev_path[SYSFS_PATH_MAX]; struct sysfs_class_device *class_dev = NULL; 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; } /* wait for the "dev" file to show up in the directory in sysfs. * If it doesn't happen in about 10 seconds, give up. */ #define SECONDS_TO_WAIT_FOR_DEV 10 static int sleep_for_dev(char *path) { char filename[SYSFS_PATH_MAX + 6]; int loop = SECONDS_TO_WAIT_FOR_DEV; int retval; strcpy(filename, sysfs_path); strcat(filename, path); strcat(filename, "/dev"); while (loop--) { struct stat buf; dbg("looking for '%s'", filename); retval = stat(filename, &buf); if (!retval) goto exit; /* sleep to give the kernel a chance to create the dev file */ sleep(1); } retval = -ENODEV; exit: return retval; } int udev_add_device(char *path, char *subsystem) { struct sysfs_class_device *class_dev = NULL; struct udevice dev; int retval = -EINVAL; memset(&dev, 0x00, sizeof(dev)); /* for now, the block layer is the only place where block devices are */ if (strcmp(subsystem, "block") == 0) dev.type = 'b'; else dev.type = 'c'; retval = sleep_for_dev(path); if (retval) goto exit; class_dev = get_class_dev(path); if (class_dev == NULL) goto exit; retval = get_major_minor(class_dev, &dev); if (retval) { dbg("get_major_minor failed"); goto exit; } retval = namedev_name_device(class_dev, &dev); if (retval) goto exit; retval = udevdb_add_dev(path, &dev); if (retval != 0) dbg("udevdb_add_dev failed, but we are going to try to create the node anyway. " "But remove might not work properly for this device."); dbg("name='%s'", dev.name); retval = create_node(&dev); exit: if (class_dev) sysfs_close_class_device(class_dev); return retval; }