2 * libudev - interface to udev device information
4 * Copyright (C) 2003-2009 Kay Sievers <kay.sievers@vrfy.org>
6 * This library is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
22 #include <sys/param.h>
25 #include "libudev-private.h"
27 static int create_path(struct udev *udev, const char *path, bool selinux)
29 char p[UTIL_PATH_SIZE];
34 util_strscpy(p, sizeof(p), path);
35 pos = strrchr(p, '/');
38 while (pos != p && pos[-1] == '/')
44 if (stat(p, &stats) == 0) {
45 if ((stats.st_mode & S_IFMT) == S_IFDIR)
51 err = util_create_path(udev, p);
56 udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
60 if (err == -EEXIST && stat(p, &stats) == 0) {
61 if ((stats.st_mode & S_IFMT) == S_IFDIR)
68 udev_selinux_resetfscreatecon(udev);
72 int util_create_path(struct udev *udev, const char *path)
74 return create_path(udev, path, false);
77 int util_create_path_selinux(struct udev *udev, const char *path)
79 return create_path(udev, path, true);
82 int util_delete_path(struct udev *udev, const char *path)
84 char p[UTIL_PATH_SIZE];
91 util_strscpy(p, sizeof(p), path);
92 pos = strrchr(p, '/');
93 if (pos == p || pos == NULL)
98 pos = strrchr(p, '/');
100 /* don't remove the last one */
101 if ((pos == p) || (pos == NULL))
114 uid_t util_lookup_user(struct udev *udev, const char *user)
120 size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
121 char *buf = alloca(buflen);
123 if (strcmp(user, "root") == 0)
125 uid = strtoul(user, &endptr, 10);
126 if (endptr[0] == '\0')
129 errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw);
132 if (errno == 0 || errno == ENOENT || errno == ESRCH)
133 err(udev, "specified user '%s' unknown\n", user);
135 err(udev, "error resolving user '%s': %m\n", user);
139 gid_t util_lookup_group(struct udev *udev, const char *group)
145 size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
148 if (strcmp(group, "root") == 0)
150 gid = strtoul(group, &endptr, 10);
151 if (endptr[0] == '\0')
157 newbuf = realloc(buf, buflen);
161 errno = getgrnam_r(group, &grbuf, buf, buflen, &gr);
164 } else if (errno == ERANGE) {
167 } else if (errno == 0 || errno == ENOENT || errno == ESRCH) {
168 err(udev, "specified group '%s' unknown\n", group);
170 err(udev, "error resolving group '%s': %m\n", group);
178 /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
179 int util_resolve_subsys_kernel(struct udev *udev, const char *string,
180 char *result, size_t maxsize, int read_value)
182 char temp[UTIL_PATH_SIZE];
185 struct udev_device *dev;
188 if (string[0] != '[')
191 util_strscpy(temp, sizeof(temp), string);
195 sysname = strchr(subsys, '/');
199 sysname = &sysname[1];
201 attr = strchr(sysname, ']');
211 if (read_value && attr == NULL)
214 dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
221 val = udev_device_get_sysattr_value(dev, attr);
223 util_strscpy(result, maxsize, val);
226 dbg(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
232 l = util_strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
234 util_strpcpyl(&s, l, "/", attr, NULL);
235 dbg(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
237 udev_device_unref(dev);