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Diffstat (limited to 'udev/lib/libudev-enumerate.c')
| -rw-r--r-- | udev/lib/libudev-enumerate.c | 190 |
1 files changed, 190 insertions, 0 deletions
diff --git a/udev/lib/libudev-enumerate.c b/udev/lib/libudev-enumerate.c new file mode 100644 index 0000000000..e3198665fc --- /dev/null +++ b/udev/lib/libudev-enumerate.c @@ -0,0 +1,190 @@ +/* + * libudev - interface to udev device information + * + * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org> + * + * 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, either version 2 of the License, or + * (at your option) any later version. + * + * 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, see <http://www.gnu.org/licenses/>. + */ + +#include "config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <unistd.h> +#include <errno.h> +#include <string.h> +#include <dirent.h> +#include <sys/stat.h> + +#include "libudev.h" +#include "libudev-private.h" +#include "../udev.h" + +static int devices_scan_subsystem(struct udev *udev, + const char *basedir, const char *subsystem, const char *subdir, + struct list_head *device_list) +{ + char path[PATH_SIZE]; + DIR *dir; + struct dirent *dent; + size_t len; + + len = strlcpy(path, udev_get_sys_path(udev), sizeof(path)); + strlcat(path, basedir, sizeof(path)); + strlcat(path, "/", sizeof(path)); + strlcat(path, subsystem, sizeof(path)); + if (subdir != NULL) + strlcat(path, subdir, sizeof(path)); + dir = opendir(path); + if (dir == NULL) + return -1; + for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { + char devpath[PATH_SIZE]; + + if (dent->d_name[0] == '.') + continue; + strlcpy(devpath, &path[len], sizeof(devpath)); + strlcat(devpath, "/", sizeof(devpath)); + strlcat(devpath, dent->d_name, sizeof(devpath)); + sysfs_resolve_link(devpath, sizeof(devpath)); + name_list_add(device_list, devpath, 1); + } + closedir(dir); + return 0; +} + +static int devices_scan_subsystems(struct udev *udev, + const char *basedir, const char *subsystem, const char *subdir, + struct list_head *device_list) +{ + char path[PATH_SIZE]; + DIR *dir; + struct dirent *dent; + + if (subsystem != NULL) + return devices_scan_subsystem(udev, basedir, subsystem, subdir, device_list); + + strlcpy(path, udev_get_sys_path(udev), sizeof(path)); + strlcat(path, basedir, sizeof(path)); + dir = opendir(path); + if (dir == NULL) + return -1; + for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) { + if (dent->d_name[0] == '.') + continue; + devices_scan_subsystem(udev, basedir, dent->d_name, subdir, device_list); + } + closedir(dir); + return 0; +} + +static int devices_delay(struct udev *udev, const char *devpath) +{ + static const char *delay_device_list[] = { + "/block/md", + "/block/dm-", + NULL + }; + int i; + + for (i = 0; delay_device_list[i] != NULL; i++) { + if (strstr(devpath, delay_device_list[i]) != NULL) { + log_info(udev, "delaying: %s\n", devpath); + return 1; + } + } + return 0; +} + +static int devices_call(struct udev *udev, const char *devpath, + int (*cb)(struct udev *udev, + const char *devpath, const char *subsystem, const char *name, + void *data), + void *data, + int *cb_rc) +{ + char subsystem[NAME_SIZE]; + const char *name; + + name = strrchr(devpath, '/'); + if (name == NULL) + return -1; + name++; + + if (util_get_sys_subsystem(udev, devpath, subsystem, sizeof(subsystem)) < 2) + return -1; + *cb_rc = cb(udev, devpath, subsystem, name, data); + return 0; +} + +/** + * udev_devices_enumerate: + * @udev_device: udev device + * @cb: function to be called for every property found + * @data: data to be passed to the function + * + * Retrieve the property key/value pairs belonging to the + * udev device. For every key/value pair, the passed function will be + * called. If the function returns 1, remaning properties will be + * ignored. + * + * Returns: the number of properties passed to the caller, or a negative value on error + **/ +int udev_devices_enumerate(struct udev *udev, const char *subsystem, + int (*cb)(struct udev *udev, + const char *devpath, const char *subsystem, const char *name, void *data), + void *data) +{ + char base[PATH_SIZE]; + struct stat statbuf; + struct list_head device_list; + struct name_entry *loop_device; + struct name_entry *tmp_device; + int cb_rc = 0; + int count = 0; + + INIT_LIST_HEAD(&device_list); + + /* if we have /sys/subsystem/, forget all the old stuff */ + strlcpy(base, sysfs_path, sizeof(base)); + strlcat(base, "/subsystem", sizeof(base)); + if (stat(base, &statbuf) == 0) { + devices_scan_subsystems(udev, "/subsystem", subsystem, "/devices", &device_list); + } else { + devices_scan_subsystems(udev, "/bus", subsystem, "/devices", &device_list); + devices_scan_subsystems(udev, "/class", subsystem, NULL, &device_list); + } + + list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) { + if (devices_delay(udev, loop_device->name)) + continue; + if (cb_rc == 0) + if (devices_call(udev, loop_device->name, cb, data, &cb_rc) == 0) + count++; + list_del(&loop_device->node); + free(loop_device); + } + + /* handle remaining delayed devices */ + list_for_each_entry_safe(loop_device, tmp_device, &device_list, node) { + if (cb_rc == 0) + if (devices_call(udev, loop_device->name, cb, data, &cb_rc) == 0) + count++; + list_del(&loop_device->node); + free(loop_device); + } + + return count; +} |