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hotplug2: replace udevtrigger from the udev-106 source with a much smaller self-contained, stripped-down version
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@25920 3c298f89-4303-0410-b956-a3cf2f4a3e73
This commit is contained in:
nbd
345
package/hotplug2/src/udevtrigger.c
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345
package/hotplug2/src/udevtrigger.c
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/*
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* Copyright (C) 2004-2006 Kay Sievers <kay@vrfy.org>
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* Copyright (C) 2006 Hannes Reinecke <hare@suse.de>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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*/
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#include <stdlib.h>
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#include <stddef.h>
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#include <stdarg.h>
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#include <string.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <getopt.h>
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#include <errno.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <syslog.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#define PATH_SIZE 512
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static int verbose;
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static int dry_run;
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void log_message(int priority, const char *format, ...)
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{
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va_list args;
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va_start(args, format);
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vsyslog(priority, format, args);
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va_end(args);
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}
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#undef err
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#define err(format, arg...) \
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do { \
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log_message(LOG_ERR ,"%s: " format ,__FUNCTION__ ,## arg); \
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} while (0)
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#undef info
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#define info(format, arg...) \
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do { \
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log_message(LOG_INFO ,"%s: " format ,__FUNCTION__ ,## arg); \
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} while (0)
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#ifdef DEBUG
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#undef dbg
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#define dbg(format, arg...) \
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do { \
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log_message(LOG_DEBUG ,"%s: " format ,__FUNCTION__ ,## arg); \
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} while (0)
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#else
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#define dbg(...) do {} while(0)
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#endif
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static void trigger_uevent(const char *devpath)
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{
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char filename[PATH_SIZE];
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int fd;
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strlcpy(filename, "/sys", sizeof(filename));
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strlcat(filename, devpath, sizeof(filename));
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strlcat(filename, "/uevent", sizeof(filename));
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if (verbose)
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printf("%s\n", devpath);
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if (dry_run)
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return;
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fd = open(filename, O_WRONLY);
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if (fd < 0) {
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dbg("error on opening %s: %s\n", filename, strerror(errno));
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return;
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}
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if (write(fd, "add", 3) < 0)
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info("error on triggering %s: %s\n", filename, strerror(errno));
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close(fd);
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}
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static int sysfs_resolve_link(char *devpath, size_t size)
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{
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char link_path[PATH_SIZE];
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char link_target[PATH_SIZE];
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int len;
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int i;
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int back;
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strlcpy(link_path, "/sys", sizeof(link_path));
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strlcat(link_path, devpath, sizeof(link_path));
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len = readlink(link_path, link_target, sizeof(link_target));
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if (len <= 0)
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return -1;
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link_target[len] = '\0';
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dbg("path link '%s' points to '%s'", devpath, link_target);
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for (back = 0; strncmp(&link_target[back * 3], "../", 3) == 0; back++)
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;
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dbg("base '%s', tail '%s', back %i", devpath, &link_target[back * 3], back);
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for (i = 0; i <= back; i++) {
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char *pos = strrchr(devpath, '/');
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if (pos == NULL)
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return -1;
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pos[0] = '\0';
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}
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dbg("after moving back '%s'", devpath);
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strlcat(devpath, "/", size);
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strlcat(devpath, &link_target[back * 3], size);
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return 0;
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}
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static int device_list_insert(const char *path)
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{
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char filename[PATH_SIZE];
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char devpath[PATH_SIZE];
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struct stat statbuf;
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dbg("add '%s'" , path);
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/* we only have a device, if we have an uevent file */
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strlcpy(filename, path, sizeof(filename));
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strlcat(filename, "/uevent", sizeof(filename));
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if (stat(filename, &statbuf) < 0)
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return -1;
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if (!(statbuf.st_mode & S_IWUSR))
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return -1;
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strlcpy(devpath, &path[4], sizeof(devpath));
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/* resolve possible link to real target */
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if (lstat(path, &statbuf) < 0)
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return -1;
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if (S_ISLNK(statbuf.st_mode))
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if (sysfs_resolve_link(devpath, sizeof(devpath)) != 0)
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return -1;
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trigger_uevent(devpath);
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return 0;
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}
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static void scan_subsystem(const char *subsys)
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{
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char base[PATH_SIZE];
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DIR *dir;
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struct dirent *dent;
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strlcpy(base, "/sys/", sizeof(base));
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strlcat(base, subsys, sizeof(base));
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dir = opendir(base);
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if (dir != NULL) {
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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char dirname[PATH_SIZE];
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DIR *dir2;
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struct dirent *dent2;
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if (dent->d_name[0] == '.')
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continue;
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strlcpy(dirname, base, sizeof(dirname));
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strlcat(dirname, "/", sizeof(dirname));
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strlcat(dirname, dent->d_name, sizeof(dirname));
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strlcat(dirname, "/devices", sizeof(dirname));
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/* look for devices */
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dir2 = opendir(dirname);
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if (dir2 != NULL) {
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for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
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char dirname2[PATH_SIZE];
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if (dent2->d_name[0] == '.')
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continue;
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strlcpy(dirname2, dirname, sizeof(dirname2));
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strlcat(dirname2, "/", sizeof(dirname2));
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strlcat(dirname2, dent2->d_name, sizeof(dirname2));
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device_list_insert(dirname2);
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}
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closedir(dir2);
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}
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}
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closedir(dir);
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}
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}
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static void scan_block(void)
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{
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char base[PATH_SIZE];
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DIR *dir;
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struct dirent *dent;
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strlcpy(base, "/sys/block", sizeof(base));
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dir = opendir(base);
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if (dir != NULL) {
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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char dirname[PATH_SIZE];
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DIR *dir2;
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struct dirent *dent2;
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if (dent->d_name[0] == '.')
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continue;
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strlcpy(dirname, base, sizeof(dirname));
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strlcat(dirname, "/", sizeof(dirname));
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strlcat(dirname, dent->d_name, sizeof(dirname));
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if (device_list_insert(dirname) != 0)
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continue;
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/* look for partitions */
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dir2 = opendir(dirname);
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if (dir2 != NULL) {
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for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
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char dirname2[PATH_SIZE];
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if (dent2->d_name[0] == '.')
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continue;
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if (!strcmp(dent2->d_name,"device"))
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continue;
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strlcpy(dirname2, dirname, sizeof(dirname2));
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strlcat(dirname2, "/", sizeof(dirname2));
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strlcat(dirname2, dent2->d_name, sizeof(dirname2));
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device_list_insert(dirname2);
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}
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closedir(dir2);
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}
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}
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closedir(dir);
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}
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}
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static void scan_class(void)
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{
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char base[PATH_SIZE];
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DIR *dir;
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struct dirent *dent;
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strlcpy(base, "/sys/class", sizeof(base));
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dir = opendir(base);
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if (dir != NULL) {
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for (dent = readdir(dir); dent != NULL; dent = readdir(dir)) {
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char dirname[PATH_SIZE];
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DIR *dir2;
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struct dirent *dent2;
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if (dent->d_name[0] == '.')
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continue;
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strlcpy(dirname, base, sizeof(dirname));
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strlcat(dirname, "/", sizeof(dirname));
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strlcat(dirname, dent->d_name, sizeof(dirname));
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dir2 = opendir(dirname);
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if (dir2 != NULL) {
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for (dent2 = readdir(dir2); dent2 != NULL; dent2 = readdir(dir2)) {
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char dirname2[PATH_SIZE];
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if (dent2->d_name[0] == '.')
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continue;
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if (!strcmp(dent2->d_name, "device"))
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continue;
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strlcpy(dirname2, dirname, sizeof(dirname2));
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strlcat(dirname2, "/", sizeof(dirname2));
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strlcat(dirname2, dent2->d_name, sizeof(dirname2));
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device_list_insert(dirname2);
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}
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closedir(dir2);
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}
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}
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closedir(dir);
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}
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}
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int main(int argc, char *argv[], char *envp[])
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{
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char base[PATH_SIZE];
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struct stat statbuf;
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int failed = 0;
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int option;
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openlog("udevtrigger", LOG_PID | LOG_CONS, LOG_DAEMON);
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while (1) {
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option = getopt(argc, argv, "vnh");
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if (option == -1)
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break;
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switch (option) {
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case 'v':
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verbose = 1;
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break;
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case 'n':
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dry_run = 1;
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break;
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case 'h':
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printf("Usage: udevtrigger OPTIONS\n"
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" -v print the list of devices while running\n"
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" -n do not actually trigger the events\n"
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" -h print this text\n"
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"\n");
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goto exit;
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default:
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goto exit;
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}
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}
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/* if we have /sys/subsystem, forget all the old stuff */
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scan_subsystem("bus");
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scan_class();
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/* scan "block" if it isn't a "class" */
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strlcpy(base, "/sys/class/block", sizeof(base));
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if (stat(base, &statbuf) != 0)
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scan_block();
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exit:
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closelog();
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return 0;
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}
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