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/*
* udev.c
*
* Userspace devfs
*
* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
* Copyright (C) 2004 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 "libsysfs/sysfs/libsysfs.h"
#include "udev_libc_wrapper.h"
#include "udev.h"
#include "udev_utils.h"
#include "udev_sysfs.h"
#include "udev_version.h"
#include "udev_rules.h"
#include "logging.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 udevice udev;
struct udev_rules rules;
char path[PATH_SIZE];
const char *error;
const char *action;
const char *devpath;
const char *subsystem;
struct sigaction act;
int retval = -EINVAL;
if (argc == 2 && strcmp(argv[1], "-V") == 0) {
printf("%s\n", UDEV_VERSION);
exit(0);
}
logging_init("udev");
udev_init_config();
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(ALARM_TIMEOUT);
action = getenv("ACTION");
devpath = getenv("DEVPATH");
subsystem = getenv("SUBSYSTEM");
/* older kernels passed the SUBSYSTEM only as argument */
if (!subsystem && argc == 2)
subsystem = argv[1];
if (!action || !subsystem || !devpath) {
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);
}
udev_init_device(&udev, devpath, subsystem, action);
udev_rules_init(&rules, 0);
if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS || udev.type == DEV_NET) {
/* handle device node */
if (strcmp(action, "add") == 0) {
struct sysfs_class_device *class_dev;
/* wait for sysfs of /sys/class /sys/block */
dbg("node add");
snprintf(path, sizeof(path), "%s%s", sysfs_path, udev.devpath);
path[sizeof(path)-1] = '\0';
class_dev = wait_class_device_open(path);
if (class_dev == NULL) {
dbg("open class device failed");
goto run;
}
dbg("opened class_dev->name='%s'", class_dev->name);
wait_for_class_device(class_dev, &error);
/* get major/minor */
if (udev.type == DEV_BLOCK || udev.type == DEV_CLASS)
udev.devt = get_devt(class_dev);
if (udev.type == DEV_NET || udev.devt) {
/* name device */
udev_rules_get_name(&rules, &udev, class_dev);
if (udev.ignore_device) {
info("device event will be ignored");
goto cleanup;
}
if (udev.name[0] == '\0') {
info("device node creation supressed");
goto cleanup;
}
/* create node, store in db */
retval = udev_add_device(&udev, class_dev);
} else {
dbg("no dev-file found");
udev_rules_get_run(&rules, &udev, NULL);
if (udev.ignore_device) {
info("device event will be ignored");
goto cleanup;
}
}
sysfs_close_class_device(class_dev);
} else if (strcmp(action, "remove") == 0) {
dbg("node remove");
udev_rules_get_run(&rules, &udev, NULL);
if (udev.ignore_device) {
dbg("device event will be ignored");
goto cleanup;
}
/* get name from db, remove db-entry, delete node */
retval = udev_remove_device(&udev);
}
/* export name of device node or netif */
if (udev.devname[0] != '\0')
setenv("DEVNAME", udev.devname, 1);
} else if (udev.type == DEV_DEVICE && strcmp(action, "add") == 0) {
struct sysfs_device *devices_dev;
/* wait for sysfs of /sys/devices/ */
dbg("devices add");
snprintf(path, sizeof(path), "%s%s", sysfs_path, devpath);
path[sizeof(path)-1] = '\0';
devices_dev = wait_devices_device_open(path);
if (!devices_dev) {
dbg("devices device unavailable (probably remove has beaten us)");
goto run;
}
dbg("devices device opened '%s'", path);
wait_for_devices_device(devices_dev, &error);
udev_rules_get_run(&rules, &udev, devices_dev);
sysfs_close_device(devices_dev);
if (udev.ignore_device) {
info("device event will be ignored");
goto cleanup;
}
} else {
dbg("default handling");
udev_rules_get_run(&rules, &udev, NULL);
if (udev.ignore_device) {
info("device event will be ignored");
goto cleanup;
}
}
run:
if (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)
execute_program(name_loop->name, udev.subsystem, NULL, 0, NULL);
}
cleanup:
udev_cleanup_device(&udev);
exit:
logging_close();
return retval;
}
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