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/*
* Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004-2008 Kay Sievers <kay.sievers@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 <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <fcntl.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include <unistd.h>
#include <syslog.h>
#include <grp.h>
#include "udev.h"
#include "udev_rules.h"
static void asmlinkage sig_handler(int signum)
{
switch (signum) {
case SIGALRM:
exit(1);
case SIGINT:
case SIGTERM:
exit(20 + signum);
}
}
int main(int argc, char *argv[])
{
struct udev *udev;
struct sysfs_device *dev;
struct udevice *udevice;
const char *maj, *min;
struct udev_rules rules;
const char *action;
const char *devpath;
const char *subsystem;
struct sigaction act;
int retval = -EINVAL;
udev = udev_new();
if (udev == NULL)
exit(1);
dbg(udev, "version %s\n", VERSION);
selinux_init(udev);
/* set signal handlers */
memset(&act, 0x00, sizeof(act));
act.sa_handler = (void (*)(int)) sig_handler;
sigemptyset (&act.sa_mask);
act.sa_flags = 0;
sigaction(SIGALRM, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
/* trigger timeout to prevent hanging processes */
alarm(UDEV_EVENT_TIMEOUT);
action = getenv("ACTION");
devpath = getenv("DEVPATH");
subsystem = getenv("SUBSYSTEM");
/* older kernels passed the SUBSYSTEM only as argument */
if (subsystem == NULL && argc == 2)
subsystem = argv[1];
if (action == NULL || subsystem == NULL || devpath == NULL) {
err(udev, "action, subsystem or devpath missing\n");
goto exit;
}
/* export log_priority , as called programs may want to do the same as udev */
if (udev_get_log_priority(udev) > 0) {
char priority[32];
sprintf(priority, "%i", udev_get_log_priority(udev));
setenv("UDEV_LOG", priority, 1);
}
sysfs_init();
udev_rules_init(udev, &rules, 0);
dev = sysfs_device_get(udev, devpath);
if (dev == NULL) {
info(udev, "unable to open '%s'\n", devpath);
goto fail;
}
udevice = udev_device_init(udev);
if (udevice == NULL)
goto fail;
/* override built-in sysfs device */
udevice->dev = dev;
util_strlcpy(udevice->action, action, sizeof(udevice->action));
/* get dev_t from environment, which is needed for "remove" to work, "add" works also from sysfs */
maj = getenv("MAJOR");
min = getenv("MINOR");
if (maj != NULL && min != NULL)
udevice->devt = makedev(atoi(maj), atoi(min));
else
udevice->devt = udev_device_get_devt(udevice);
retval = udev_device_event(&rules, udevice);
/* rules may change/disable the timeout */
if (udevice->event_timeout >= 0)
alarm(udevice->event_timeout);
if (retval == 0 && !udevice->ignore_device && udev_get_run(udev))
udev_rules_run(udevice);
udev_device_cleanup(udevice);
fail:
udev_rules_cleanup(&rules);
sysfs_cleanup();
exit:
selinux_exit(udev);
udev_unref(udev);
if (retval != 0)
return 1;
return 0;
}
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