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/*
* udev.c
*
* Userspace devfs
*
* Copyright (C) 2003,2004 Greg Kroah-Hartman <greg@kroah.com>
*
* 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.
*
*/
#define _KLIBC_HAS_ARCH_SIG_ATOMIC_T
#include <stdio.h>
#include <stddef.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <errno.h>
#include <signal.h>
#include "libsysfs/sysfs/libsysfs.h"
#include "udev.h"
#include "udev_lib.h"
#include "udev_version.h"
#include "logging.h"
#include "namedev.h"
#include "udevdb.h"
/* timeout flag for udevdb */
extern sig_atomic_t gotalarm;
/* global variables */
char **main_argv;
char **main_envp;
#ifdef LOG
unsigned char logname[LOGNAME_SIZE];
void log_message(int level, const char *format, ...)
{
va_list args;
if (!udev_log)
return;
va_start(args, format);
vsyslog(level, format, args);
va_end(args);
}
#endif
static void asmlinkage sig_handler(int signum)
{
switch (signum) {
case SIGALRM:
gotalarm = 1;
info("error: timeout reached, event probably not handled correctly");
break;
case SIGINT:
case SIGTERM:
udevdb_exit();
exit(20 + signum);
default:
dbg("unhandled signal %d", signum);
}
}
/* list of subsystems we don't care about. not listing such systems here
* is not critical, but it makes it faster as we don't look for the "dev" file
*/
static int subsystem_without_dev(const char *subsystem)
{
char *subsystem_blacklist[] = {
"scsi_host",
"scsi_device",
"usb_host",
"pci_bus",
"pcmcia_socket",
"bluetooth",
"i2c-adapter",
"pci_bus",
"ieee1394",
"ieee1394_host",
"ieee1394_node",
NULL
};
char **subsys;
for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) {
if (strcmp(subsystem, *subsys) == 0)
return 1;
}
return 0;
}
int main(int argc, char *argv[], char *envp[])
{
struct sigaction act;
char *action;
char *devpath = "";
char *subsystem = "";
int retval = -EINVAL;
enum {
ADD,
REMOVE,
UDEVSTART,
} act_type;
dbg("version %s", UDEV_VERSION);
main_argv = argv;
main_envp = envp;
init_logging("udev");
udev_init_config();
if (strstr(argv[0], "udevstart")) {
act_type = UDEVSTART;
} else {
action = get_action();
if (!action) {
dbg("no action?");
goto exit;
}
if (strcmp(action, "add") == 0) {
act_type = ADD;
} else if (strcmp(action, "remove") == 0) {
act_type = REMOVE;
} else {
dbg("unknown action '%s'", action);
goto exit;
}
devpath = get_devpath();
if (!devpath) {
dbg("no devpath?");
goto exit;
}
dbg("looking at '%s'", devpath);
/* we only care about class devices and block stuff */
if (!strstr(devpath, "class") && !strstr(devpath, "block")) {
dbg("not a block or class device");
goto exit;
}
subsystem = get_subsystem(main_argv[1]);
if (!subsystem) {
dbg("no subsystem?");
goto exit;
}
/* skip blacklisted subsystems */
if (subsystem_without_dev(subsystem)) {
dbg("don't care about '%s' devices", subsystem);
exit(0);
};
}
/* set signal handlers */
act.sa_handler = (void (*) (int))sig_handler;
sigemptyset (&act.sa_mask);
/* alarm must not restart syscalls*/
sigaction(SIGALRM, &act, NULL);
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
/* trigger timout to interrupt blocking syscalls */
alarm(ALARM_TIMEOUT);
/* initialize udev database */
if (udevdb_init(UDEVDB_DEFAULT) != 0)
info("error: unable to initialize database, continuing without database");
switch(act_type) {
case UDEVSTART:
dbg("udevstart");
namedev_init();
retval = udev_start();
break;
case ADD:
dbg("udev add");
namedev_init();
retval = udev_add_device(devpath, subsystem, NOFAKE);
break;
case REMOVE:
dbg("udev remove");
retval = udev_remove_device(devpath, subsystem);
}
udevdb_exit();
exit:
return retval;
}
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