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 dbg(udev, "stat '%s'\n", p);
45 if (stat(p, &stats) == 0) {
46 if ((stats.st_mode & S_IFMT) == S_IFDIR)
52 err = util_create_path(udev, p);
56 dbg(udev, "mkdir '%s'\n", p);
58 udev_selinux_setfscreatecon(udev, p, S_IFDIR|0755);
62 if (err == -EEXIST && stat(p, &stats) == 0) {
63 if ((stats.st_mode & S_IFMT) == S_IFDIR)
70 udev_selinux_resetfscreatecon(udev);
74 int util_create_path(struct udev *udev, const char *path)
76 return create_path(udev, path, false);
79 int util_create_path_selinux(struct udev *udev, const char *path)
81 return create_path(udev, path, true);
84 int util_delete_path(struct udev *udev, const char *path)
86 char p[UTIL_PATH_SIZE];
93 util_strscpy(p, sizeof(p), path);
94 pos = strrchr(p, '/');
95 if (pos == p || pos == NULL)
100 pos = strrchr(p, '/');
102 /* don't remove the last one */
103 if ((pos == p) || (pos == NULL))
116 uid_t util_lookup_user(struct udev *udev, const char *user)
119 size_t buflen = sysconf(_SC_GETPW_R_SIZE_MAX);
125 if (strcmp(user, "root") == 0)
127 uid = strtoul(user, &endptr, 10);
128 if (endptr[0] == '\0')
131 errno = getpwnam_r(user, &pwbuf, buf, buflen, &pw);
134 if (errno == 0 || errno == ENOENT || errno == ESRCH)
135 err(udev, "specified user '%s' unknown\n", user);
137 err(udev, "error resolving user '%s': %m\n", user);
141 gid_t util_lookup_group(struct udev *udev, const char *group)
144 size_t buflen = sysconf(_SC_GETGR_R_SIZE_MAX);
150 if (strcmp(group, "root") == 0)
152 gid = strtoul(group, &endptr, 10);
153 if (endptr[0] == '\0')
160 newbuf = realloc(buf, buflen);
164 errno = getgrnam_r(group, &grbuf, buf, buflen, &gr);
167 } else if (errno == ERANGE) {
170 } else if (errno == 0 || errno == ENOENT || errno == ESRCH) {
171 err(udev, "specified group '%s' unknown\n", group);
173 err(udev, "error resolving group '%s': %m\n", group);
181 /* handle "[<SUBSYSTEM>/<KERNEL>]<attribute>" format */
182 int util_resolve_subsys_kernel(struct udev *udev, const char *string,
183 char *result, size_t maxsize, int read_value)
185 char temp[UTIL_PATH_SIZE];
188 struct udev_device *dev;
191 if (string[0] != '[')
194 util_strscpy(temp, sizeof(temp), string);
198 sysname = strchr(subsys, '/');
202 sysname = &sysname[1];
204 attr = strchr(sysname, ']');
214 if (read_value && attr == NULL)
217 dev = udev_device_new_from_subsystem_sysname(udev, subsys, sysname);
224 val = udev_device_get_sysattr_value(dev, attr);
226 util_strscpy(result, maxsize, val);
229 info(udev, "value '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
235 l = util_strpcpyl(&s, maxsize, udev_device_get_syspath(dev), NULL);
237 util_strpcpyl(&s, l, "/", attr, NULL);
238 info(udev, "path '[%s/%s]%s' is '%s'\n", subsys, sysname, attr, result);
240 udev_device_unref(dev);