2 * udev_lib - generic stuff used by udev
4 * Copyright (C) 2004 Kay Sievers <kay@vrfy.org>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the
8 * Free Software Foundation version 2 of the License.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * You should have received a copy of the GNU General Public License along
16 * with this program; if not, write to the Free Software Foundation, Inc.,
17 * 675 Mass Ave, Cambridge, MA 02139, USA.
38 char *get_action(void)
42 action = getenv("ACTION");
43 if (action != NULL && strlen(action) > ACTION_SIZE)
44 action[ACTION_SIZE-1] = '\0';
49 char *get_devpath(void)
53 devpath = getenv("DEVPATH");
54 if (devpath != NULL && strlen(devpath) > DEVPATH_SIZE)
55 devpath[DEVPATH_SIZE-1] = '\0';
60 char *get_devname(void)
64 devname = getenv("DEVNAME");
65 if (devname != NULL && strlen(devname) > NAME_SIZE)
66 devname[NAME_SIZE-1] = '\0';
71 char *get_seqnum(void)
75 seqnum = getenv("SEQNUM");
80 char *get_subsystem(char *subsystem)
82 if (subsystem != NULL && strlen(subsystem) > SUBSYSTEM_SIZE)
83 subsystem[SUBSYSTEM_SIZE-1] = '\0';
88 #define BLOCK_PATH "/block/"
89 #define CLASS_PATH "/class/"
90 #define NET_PATH "/class/net/"
92 char get_device_type(const char *path, const char *subsystem)
94 if (strcmp(subsystem, "block") == 0)
97 if (strcmp(subsystem, "net") == 0)
100 if (strncmp(path, BLOCK_PATH, strlen(BLOCK_PATH)) == 0 &&
101 strlen(path) > strlen(BLOCK_PATH))
104 if (strncmp(path, NET_PATH, strlen(NET_PATH)) == 0 &&
105 strlen(path) > strlen(NET_PATH))
108 if (strncmp(path, CLASS_PATH, strlen(CLASS_PATH)) == 0 &&
109 strlen(path) > strlen(CLASS_PATH))
115 void udev_set_values(struct udevice *udev, const char* devpath, const char *subsystem)
117 memset(udev, 0x00, sizeof(struct udevice));
118 strfieldcpy(udev->devpath, devpath);
119 strfieldcpy(udev->subsystem, subsystem);
120 udev->type = get_device_type(devpath, subsystem);
123 int file_map(const char *filename, char **buf, size_t *bufsize)
128 fd = open(filename, O_RDONLY);
133 if (fstat(fd, &stats) < 0) {
138 *buf = mmap(NULL, stats.st_size, PROT_READ, MAP_SHARED, fd, 0);
139 if (*buf == MAP_FAILED) {
143 *bufsize = stats.st_size;
150 void file_unmap(char *buf, size_t bufsize)
152 munmap(buf, bufsize);
155 size_t buf_get_line(char *buf, size_t buflen, size_t cur)
159 for (count = cur; count < buflen && buf[count] != '\n'; count++);
164 void leading_slash(char *path)
169 if (len > 0 && path[len-1] != '/') {
175 void no_leading_slash(char *path)
180 if (len > 0 && path[len-1] == '/')
185 struct list_head list;
186 char name[NAME_SIZE];
189 /* sort files in lexical order */
190 static int file_list_insert(char *filename, struct list_head *file_list)
192 struct files *loop_file;
193 struct files *new_file;
195 list_for_each_entry(loop_file, file_list, list) {
196 if (strcmp(loop_file->name, filename) > 0) {
201 new_file = malloc(sizeof(struct files));
202 if (new_file == NULL) {
207 strfieldcpy(new_file->name, filename);
208 list_add_tail(&new_file->list, &loop_file->list);
212 /* calls function for every file found in specified directory */
213 int call_foreach_file(int fnct(char *f) , char *dirname, char *suffix)
218 char file[NAME_SIZE];
219 struct files *loop_file;
220 struct files *tmp_file;
221 LIST_HEAD(file_list);
223 dbg("open directory '%s'", dirname);
224 dir = opendir(dirname);
226 dbg("unable to open '%s'", dirname);
232 if (ent == NULL || ent->d_name[0] == '\0')
235 if ((ent->d_name[0] == '.') || (ent->d_name[0] == COMMENT_CHARACTER))
238 /* look for file with specified suffix */
239 ext = strrchr(ent->d_name, '.');
243 if (strcmp(ext, suffix) != 0)
246 dbg("put file '%s/%s' in list", dirname, ent->d_name);
247 file_list_insert(ent->d_name, &file_list);
250 /* call function for every file in the list */
251 list_for_each_entry_safe(loop_file, tmp_file, &file_list, list) {
252 strfieldcpy(file, dirname);
253 strfieldcat(file, "/");
254 strfieldcat(file, loop_file->name);
258 list_del(&loop_file->list);
266 /* Set the FD_CLOEXEC flag of desc if value is nonzero,
267 or clear the flag if value is 0.
268 Return 0 on success, or -1 on error with errno set. */
270 int set_cloexec_flag (int desc, int value)
272 int oldflags = fcntl (desc, F_GETFD, 0);
273 /* If reading the flags failed, return error indication now. */
276 /* Set just the flag we want to set. */
278 oldflags |= FD_CLOEXEC;
280 oldflags &= ~FD_CLOEXEC;
281 /* Store modified flag word in the descriptor. */
282 return fcntl (desc, F_SETFD, oldflags);