6 * Copyright (C) 2003 Greg Kroah-Hartman <greg@kroah.com>
9 * This program is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation version 2 of the License.
13 * This program is distributed in the hope that it will be useful, but
14 * WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * General Public License for more details.
18 * You should have received a copy of the GNU General Public License along
19 * with this program; if not, write to the Free Software Foundation, Inc.,
20 * 675 Mass Ave, Cambridge, MA 02139, USA.
32 #include "udev_version.h"
36 static char *get_action(void)
40 action = getenv("ACTION");
45 static char *get_device(void)
47 static char device[255];
50 temp = getenv("DEVPATH");
53 strcpy(device, SYSFS_ROOT);
60 * Right now the major/minor of a device is stored in a file called
62 * The number is stored as:
66 * The value is in hex.
67 * Yes, this will probably change when we go to a bigger major/minor
68 * range, and will have to be changed at that time.
70 static int get_major_minor (char *dev, int *major, int *minor)
78 /* add the dev file to the directory and see if it's present */
79 strncpy(filename, dev, sizeof(filename));
80 strncat(filename, DEV_FILE, sizeof(filename));
81 fd = open(filename, O_RDONLY);
83 dbg("Can't open %s", filename);
87 /* get the major/minor */
88 retval = read(fd, line, sizeof(line));
90 dbg("read error on %s", dev);
97 *major = (int)strtol(&temp[0], NULL, 16);
102 *minor = (int)strtol(&temp[0], NULL, 16);
104 dbg("found major = %d, minor = %d", *major, *minor);
113 * Here would go a call to the naming deamon, to get the name we want to have
114 * for this device. But for now, let's just default to whatever the kernel is
115 * calling the device as that will keep the "old-style" naming policy
117 static char *get_name(char *dev, int major, int minor)
119 static char name[100];
122 temp = strrchr(dev, '/');
125 strncpy(name, &temp[1], sizeof(name));
127 dbg("name is %s", name);
133 * Again, this will live in the naming deamon
135 static int get_mode(char *name, char *dev, int major, int minor)
137 /* just default everyone to rw for the world! */
142 * We also want to add some permissions here, and possibly some symlinks
144 static int create_node(char *name, char type, int major, int minor, int mode)
147 char mode_string[100];
149 char major_string[20];
150 char minor_string[20];
154 strncpy(filename, UDEV_ROOT, sizeof(filename));
155 strncat(filename, name, sizeof(filename));
157 snprintf(mode_string, sizeof(mode_string), "--mode=%#o", mode);
158 snprintf(type_string, sizeof(type_string), "%c", type);
159 snprintf(major_string, sizeof(major_string), "%d", major);
160 snprintf(minor_string, sizeof(minor_string), "%d", minor);
163 argv[1] = mode_string;
165 argv[3] = type_string;
166 argv[4] = major_string;
167 argv[5] = minor_string;
169 dbg ("executing %s %s %s %s %s %s",
170 argv[0], argv[1], argv[2], argv[3], argv[4], argv[5]);
173 /* we are the child, so lets run the program */
178 dbg ("fork failed.");
188 * We also want to clean up any symlinks that were created in create_node()
190 static int delete_node(char *name)
194 strncpy(filename, UDEV_ROOT, sizeof(filename));
195 strncat(filename, name, sizeof(filename));
197 dbg("unlinking %s", filename);
198 return unlink(filename);
201 static int add_device(char *device, char type)
207 int retval = -EINVAL;
209 retval = get_major_minor(device, &major, &minor);
211 dbg ("get_major_minor failed");
215 name = get_name(device, major, minor);
217 dbg ("get_name failed");
222 mode = get_mode(name, device, major, minor);
224 dbg ("get_mode failed");
229 return create_node(name, type, major, minor, mode);
235 static int remove_device(char *device)
240 name = get_name(device, 0, 0);
242 dbg ("get_name failed");
247 return delete_node(name);
253 int main(int argc, char *argv[])
259 int retval = -EINVAL;
262 dbg ("unknown number of arguments");
268 /* sleep for a second or two to give the kernel a chance to
269 * create the dev file
273 /* for now, the block layer is the only place where block devices are */
275 if (strcmp(subsystem, "block") == 0)
280 action = get_action();
286 device = get_device();
291 dbg("looking at %s", device);
293 if (strcmp(action, "add") == 0)
294 return add_device(device, type);
296 if (strcmp(action, "remove") == 0)
297 return remove_device(device);
299 dbg("Unknown action: %s", action);