diff options
Diffstat (limited to 'libudev/libudev-device-private.c')
| -rw-r--r-- | libudev/libudev-device-private.c | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/libudev/libudev-device-private.c b/libudev/libudev-device-private.c new file mode 100644 index 0000000000..68dc0a5b98 --- /dev/null +++ b/libudev/libudev-device-private.c @@ -0,0 +1,139 @@ +/* + * libudev - interface to udev device information + * + * Copyright (C) 2008 Kay Sievers <kay.sievers@vrfy.org> + * + * This library is free software; you can redistribute it and/or + * modify it under the terms of the GNU Lesser General Public + * License as published by the Free Software Foundation; either + * version 2.1 of the License, or (at your option) any later version. + */ + +#include <stdlib.h> +#include <stdio.h> +#include <string.h> +#include <stddef.h> +#include <unistd.h> +#include <fcntl.h> +#include <string.h> +#include <sys/stat.h> + +#include "libudev.h" +#include "libudev-private.h" + +static size_t devpath_to_db_path(struct udev *udev, const char *devpath, char *filename, size_t len) +{ + char *s; + size_t l; + + s = filename; + l = util_strpcpyl(&s, len, udev_get_dev_path(udev), "/.udev/db/", NULL); + return util_path_encode(devpath, s, l); +} + +int udev_device_update_db(struct udev_device *udev_device) +{ + struct udev *udev = udev_device_get_udev(udev_device); + char filename[UTIL_PATH_SIZE]; + FILE *f; + char target[232]; /* on 64bit, tmpfs inlines up to 239 bytes */ + size_t devlen = strlen(udev_get_dev_path(udev))+1; + char *s; + size_t l; + struct udev_list_entry *list_entry; + int ret; + + devpath_to_db_path(udev, udev_device_get_devpath(udev_device), filename, sizeof(filename)); + util_create_path(udev, filename); + unlink(filename); + + udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) + if (udev_list_entry_get_flag(list_entry)) + goto file; + if (udev_device_get_num_fake_partitions(udev_device) != 0) + goto file; + if (udev_device_get_ignore_remove(udev_device)) + goto file; + if (udev_device_get_devlink_priority(udev_device) != 0) + goto file; + if (udev_device_get_event_timeout(udev_device) >= 0) + goto file; + if (udev_device_get_watch_handle(udev_device) >= 0) + goto file; + if (udev_device_get_devnode(udev_device) == NULL) + goto out; + + /* + * if we have only the node and symlinks to store, try not to waste + * tmpfs memory -- store values, if they fit, in a symlink target + */ + s = target; + l = util_strpcpy(&s, sizeof(target), &udev_device_get_devnode(udev_device)[devlen]); + udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) { + l = util_strpcpyl(&s, l, " ", &udev_list_entry_get_name(list_entry)[devlen], NULL); + if (l == 0) { + info(udev, "size of links too large, create file\n"); + goto file; + } + } + info(udev, "create db link (%s)\n", target); + udev_selinux_setfscreatecon(udev, filename, S_IFLNK); + ret = symlink(target, filename); + udev_selinux_resetfscreatecon(udev); + if (ret == 0) + goto out; +file: + f = fopen(filename, "w"); + if (f == NULL) { + err(udev, "unable to create db file '%s': %m\n", filename); + return -1; + } + info(udev, "created db file for '%s' in '%s'\n", udev_device_get_devpath(udev_device), filename); + + if (udev_device_get_devnode(udev_device) != NULL) { + fprintf(f, "N:%s\n", &udev_device_get_devnode(udev_device)[devlen]); + udev_list_entry_foreach(list_entry, udev_device_get_devlinks_list_entry(udev_device)) + fprintf(f, "S:%s\n", &udev_list_entry_get_name(list_entry)[devlen]); + } + if (udev_device_get_devlink_priority(udev_device) != 0) + fprintf(f, "L:%u\n", udev_device_get_devlink_priority(udev_device)); + if (udev_device_get_event_timeout(udev_device) >= 0) + fprintf(f, "T:%u\n", udev_device_get_event_timeout(udev_device)); + if (udev_device_get_num_fake_partitions(udev_device) != 0) + fprintf(f, "A:%u\n", udev_device_get_num_fake_partitions(udev_device)); + if (udev_device_get_ignore_remove(udev_device)) + fprintf(f, "R:%u\n", udev_device_get_ignore_remove(udev_device)); + if (udev_device_get_watch_handle(udev_device) >= 0) + fprintf(f, "W:%u\n", udev_device_get_watch_handle(udev_device)); + udev_list_entry_foreach(list_entry, udev_device_get_properties_list_entry(udev_device)) { + if (!udev_list_entry_get_flag(list_entry)) + continue; + fprintf(f, "E:%s=%s\n", + udev_list_entry_get_name(list_entry), + udev_list_entry_get_value(list_entry)); + } + fclose(f); +out: + return 0; +} + +int udev_device_delete_db(struct udev_device *udev_device) +{ + struct udev *udev = udev_device_get_udev(udev_device); + char filename[UTIL_PATH_SIZE]; + + devpath_to_db_path(udev, udev_device_get_devpath(udev_device), filename, sizeof(filename)); + unlink(filename); + return 0; +} + +int udev_device_rename_db(struct udev_device *udev_device, const char *devpath_old) +{ + struct udev *udev = udev_device_get_udev(udev_device); + char filename_old[UTIL_PATH_SIZE]; + char filename[UTIL_PATH_SIZE]; + + devpath_to_db_path(udev, devpath_old, filename_old, sizeof(filename_old)); + devpath_to_db_path(udev, udev_device_get_devpath(udev_device), filename, sizeof(filename)); + return rename(filename_old, filename); +} |