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/*
* udev.c
*
* Copyright (C) 2003-2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004-2005 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 version 2 of the License.
*
* 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, write to the Free Software Foundation, Inc.,
* 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
#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 "udev.h"
#include "udev_rules.h"
#ifdef USE_LOG
void log_message(int priority, const char *format, ...)
{
va_list args;
if (priority > udev_log_priority)
return;
va_start(args, format);
vsyslog(priority, format, args);
va_end(args);
}
#endif
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[], char *envp[])
{
struct sysfs_device *dev;
struct udevice *udev;
const char *maj, *min;
struct udev_rules rules;
const char *action;
const char *devpath;
const char *subsystem;
struct sigaction act;
int devnull;
int retval = -EINVAL;
if (argc == 2 && strcmp(argv[1], "-V") == 0) {
printf("%s\n", UDEV_VERSION);
exit(0);
}
/* set std fd's to /dev/null, if the kernel forks us, we don't have them at all */
devnull = open("/dev/null", O_RDWR);
if (devnull >= 0) {
if (devnull != STDIN_FILENO)
dup2(devnull, STDIN_FILENO);
if (devnull != STDOUT_FILENO)
dup2(devnull, STDOUT_FILENO);
if (devnull != STDERR_FILENO)
dup2(devnull, STDERR_FILENO);
if (devnull > STDERR_FILENO)
close(devnull);
}
logging_init("udev");
if (devnull < 0)
err("fatal, could not open /dev/null: %s", strerror(errno));
udev_config_init();
dbg("version %s", UDEV_VERSION);
/* 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_ALARM_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("action, subsystem or devpath missing");
goto exit;
}
/* export log_priority , as called programs may want to do the same as udev */
if (udev_log_priority) {
char priority[32];
sprintf(priority, "%i", udev_log_priority);
setenv("UDEV_LOG", priority, 1);
}
sysfs_init();
udev_rules_init(&rules, 0);
dev = sysfs_device_get(devpath);
if (dev == NULL) {
info("unable to open '%s'", devpath);
goto fail;
}
udev = udev_device_init();
if (udev == NULL)
goto fail;
/* override built-in sysfs device */
udev->dev = dev;
strlcpy(udev->action, action, sizeof(udev->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)
udev->devt = makedev(atoi(maj), atoi(min));
else
udev->devt = udev_device_get_devt(udev);
retval = udev_device_event(&rules, udev);
if (!retval && udev_run && !list_empty(&udev->run_list)) {
struct name_entry *name_loop;
dbg("executing run list");
list_for_each_entry(name_loop, &udev->run_list, node) {
if (strncmp(name_loop->name, "socket:", strlen("socket:")) == 0)
pass_env_to_socket(&name_loop->name[strlen("socket:")], devpath, action);
else {
char program[PATH_SIZE];
strlcpy(program, name_loop->name, sizeof(program));
apply_format(udev, program, sizeof(program));
run_program(program, udev->dev->subsystem, NULL, 0, NULL, (udev_log_priority >= LOG_INFO));
}
}
}
udev_device_cleanup(udev);
fail:
udev_rules_cleanup(&rules);
sysfs_cleanup();
exit:
logging_close();
return retval;
}
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