udevadm-trigger.c revision 4dd1de72e8e7ece77e8831e77eea650de404af75
/*
* Copyright (C) 2008-2009 Kay Sievers <kay@vrfy.org>
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdlib.h>
#include <stddef.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <getopt.h>
#include <errno.h>
#include <dirent.h>
#include <fcntl.h>
#include <syslog.h>
#include <fnmatch.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include "udev.h"
static int verbose;
static int dry_run;
static void exec_list(struct udev_enumerate *udev_enumerate, const char *action)
{
struct udev_list_entry *entry;
udev_list_entry_foreach(entry, udev_enumerate_get_list_entry(udev_enumerate)) {
char filename[UTIL_PATH_SIZE];
int fd;
if (verbose)
printf("%s\n", udev_list_entry_get_name(entry));
if (dry_run)
continue;
strscpyl(filename, sizeof(filename), udev_list_entry_get_name(entry), "/uevent", NULL);
fd = open(filename, O_WRONLY);
if (fd < 0)
continue;
if (write(fd, action, strlen(action)) < 0)
log_debug("error writing '%s' to '%s': %m\n", action, filename);
close(fd);
}
}
static const char *keyval(const char *str, const char **val, char *buf, size_t size)
{
char *pos;
strscpy(buf, size,str);
pos = strchr(buf, '=');
if (pos != NULL) {
pos[0] = 0;
pos++;
}
*val = pos;
return buf;
}
static int adm_trigger(struct udev *udev, int argc, char *argv[])
{
static const struct option options[] = {
{ "verbose", no_argument, NULL, 'v' },
{ "dry-run", no_argument, NULL, 'n' },
{ "type", required_argument, NULL, 't' },
{ "action", required_argument, NULL, 'c' },
{ "subsystem-match", required_argument, NULL, 's' },
{ "subsystem-nomatch", required_argument, NULL, 'S' },
{ "attr-match", required_argument, NULL, 'a' },
{ "attr-nomatch", required_argument, NULL, 'A' },
{ "property-match", required_argument, NULL, 'p' },
{ "tag-match", required_argument, NULL, 'g' },
{ "sysname-match", required_argument, NULL, 'y' },
{ "parent-match", required_argument, NULL, 'b' },
{ "help", no_argument, NULL, 'h' },
{}
};
enum {
TYPE_DEVICES,
TYPE_SUBSYSTEMS,
} device_type = TYPE_DEVICES;
const char *action = "change";
struct udev_enumerate *udev_enumerate;
int rc = 0;
udev_enumerate = udev_enumerate_new(udev);
if (udev_enumerate == NULL) {
rc = 1;
goto exit;
}
for (;;) {
int option;
const char *key;
const char *val;
char buf[UTIL_PATH_SIZE];
option = getopt_long(argc, argv, "vng:o:t:hc:p:s:S:a:A:y:b:", options, NULL);
if (option == -1)
break;
switch (option) {
case 'v':
verbose = 1;
break;
case 'n':
dry_run = 1;
break;
case 't':
if (streq(optarg, "devices")) {
device_type = TYPE_DEVICES;
} else if (streq(optarg, "subsystems")) {
device_type = TYPE_SUBSYSTEMS;
} else {
log_error("unknown type --type=%s\n", optarg);
rc = 2;
goto exit;
}
break;
case 'c':
action = optarg;
break;
case 's':
udev_enumerate_add_match_subsystem(udev_enumerate, optarg);
break;
case 'S':
udev_enumerate_add_nomatch_subsystem(udev_enumerate, optarg);
break;
case 'a':
key = keyval(optarg, &val, buf, sizeof(buf));
udev_enumerate_add_match_sysattr(udev_enumerate, key, val);
break;
case 'A':
key = keyval(optarg, &val, buf, sizeof(buf));
udev_enumerate_add_nomatch_sysattr(udev_enumerate, key, val);
break;
case 'p':
key = keyval(optarg, &val, buf, sizeof(buf));
udev_enumerate_add_match_property(udev_enumerate, key, val);
break;
case 'g':
udev_enumerate_add_match_tag(udev_enumerate, optarg);
break;
case 'y':
udev_enumerate_add_match_sysname(udev_enumerate, optarg);
break;
case 'b': {
char path[UTIL_PATH_SIZE];
struct udev_device *dev;
/* add sys dir if needed */
if (!startswith(optarg, "/sys"))
strscpyl(path, sizeof(path), "/sys", optarg, NULL);
else
strscpy(path, sizeof(path), optarg);
util_remove_trailing_chars(path, '/');
dev = udev_device_new_from_syspath(udev, path);
if (dev == NULL) {
log_error("unable to open the device '%s'\n", optarg);
rc = 2;
goto exit;
}
udev_enumerate_add_match_parent(udev_enumerate, dev);
/* drop reference immediately, enumerate pins the device as long as needed */
udev_device_unref(dev);
break;
}
case 'h':
printf("Usage: udevadm trigger OPTIONS\n"
" --verbose print the list of devices while running\n"
" --dry-run do not actually trigger the events\n"
" --type= type of events to trigger\n"
" devices sys devices (default)\n"
" subsystems sys subsystems and drivers\n"
" --action=<action> event action value, default is \"change\"\n"
" --subsystem-match=<subsystem> trigger devices from a matching subsystem\n"
" --subsystem-nomatch=<subsystem> exclude devices from a matching subsystem\n"
" --attr-match=<file[=<value>]> trigger devices with a matching attribute\n"
" --attr-nomatch=<file[=<value>]> exclude devices with a matching attribute\n"
" --property-match=<key>=<value> trigger devices with a matching property\n"
" --tag-match=<key>=<value> trigger devices with a matching property\n"
" --sysname-match=<name> trigger devices with a matching name\n"
" --parent-match=<name> trigger devices with that parent device\n"
" --help\n\n");
goto exit;
default:
rc = 1;
goto exit;
}
}
switch (device_type) {
case TYPE_SUBSYSTEMS:
udev_enumerate_scan_subsystems(udev_enumerate);
exec_list(udev_enumerate, action);
goto exit;
case TYPE_DEVICES:
udev_enumerate_scan_devices(udev_enumerate);
exec_list(udev_enumerate, action);
goto exit;
default:
assert_not_reached("device_type");
}
exit:
udev_enumerate_unref(udev_enumerate);
return rc;
}
const struct udevadm_cmd udevadm_trigger = {
.name = "trigger",
.cmd = adm_trigger,
.help = "request events from the kernel",
};