/* * udev_event.c - udev event process * * Copyright (C) 2004, 2005 Kay Sievers * * 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 #include #include #include #include #include #include #include #include #include #include "libsysfs/sysfs/libsysfs.h" #include "udev_libc_wrapper.h" #include "udev.h" #include "logging.h" #include "udev_rules.h" #include "udev_utils.h" #include "list.h" dev_t get_devt(struct sysfs_class_device *class_dev) { struct sysfs_attribute *attr = NULL; unsigned int major, minor; char *maj, *min; maj = getenv("MAJOR"); min = getenv("MINOR"); if (maj && min) { major = atoi(maj); minor = atoi(min); } else { attr = sysfs_get_classdev_attr(class_dev, "dev"); if (attr == NULL) return 0; dbg("dev='%s'", attr->value); if (sscanf(attr->value, "%u:%u", &major, &minor) != 2) return 0; } dbg("found major=%d, minor=%d", major, minor); return makedev(major, minor); } int udev_process_event(struct udev_rules *rules, struct udevice *udev) { int retval; char path[PATH_SIZE]; if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS || udev->type == DEV_NET) { /* handle device node */ if (strcmp(udev->action, "add") == 0) { struct sysfs_class_device *class_dev; dbg("node add"); snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath); path[sizeof(path)-1] = '\0'; class_dev = sysfs_open_class_device_path(path); if (class_dev == NULL) { dbg("open class device failed"); return 0; } dbg("opened class_dev->name='%s'", class_dev->name); /* get major/minor */ if (udev->type == DEV_BLOCK || udev->type == DEV_CLASS) udev->devt = get_devt(class_dev); if (udev->type == DEV_NET || udev->devt) { /* name device */ udev_rules_get_name(rules, udev, class_dev); if (udev->ignore_device) { info("device event will be ignored"); sysfs_close_class_device(class_dev); return -1; } if (udev->name[0] != '\0') { /* create node, store in db */ retval = udev_add_device(udev, class_dev); } else { info("device node creation supressed"); } } else { dbg("no dev-file found"); udev_rules_get_run(rules, udev, class_dev, NULL); if (udev->ignore_device) { info("device event will be ignored"); sysfs_close_class_device(class_dev); return -1; } } sysfs_close_class_device(class_dev); } else if (strcmp(udev->action, "remove") == 0) { struct name_entry *name_loop; /* get data from db, remove db-entry, delete node */ dbg("node remove"); retval = udev_remove_device(udev); /* restore stored persistent data */ list_for_each_entry(name_loop, &udev->env_list, node) putenv(name_loop->name); udev_rules_get_run(rules, udev, NULL, NULL); if (udev->ignore_device) { dbg("device event will be ignored"); return -1; } } /* export name of device node or netif */ if (udev->devname[0] != '\0') setenv("DEVNAME", udev->devname, 1); } else if (udev->type == DEV_DEVICE && strcmp(udev->action, "add") == 0) { struct sysfs_device *devices_dev; dbg("devices add"); snprintf(path, sizeof(path), "%s%s", sysfs_path, udev->devpath); path[sizeof(path)-1] = '\0'; devices_dev = sysfs_open_device_path(path); if (!devices_dev) { dbg("devices device unavailable (probably remove has beaten us)"); return 0; } dbg("devices device opened '%s'", path); udev_rules_get_run(rules, udev, NULL, devices_dev); sysfs_close_device(devices_dev); if (udev->ignore_device) { info("device event will be ignored"); return -1; } } else { dbg("default handling"); udev_rules_get_run(rules, udev, NULL, NULL); if (udev->ignore_device) { info("device event will be ignored"); return -1; } } return 0; }