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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.
*
*/
#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"
/* global variables */
char **main_argv;
char **main_envp;
/* local variables */
static int is_udevstart;
#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
asmlinkage static void sig_handler(int signum)
{
switch (signum) {
case SIGINT:
case SIGTERM:
udevdb_exit();
exit(20 + signum);
default:
dbg("unhandled signal %d", signum);
}
}
static char *subsystem_blacklist[] = {
"scsi_host",
"scsi_device",
"usb_host",
"pci_bus",
"pcmcia_socket",
""
};
int __udev_hotplug(char *action, const char *devpath, const char *subsystem)
{
int retval = -EINVAL;
int i;
struct sigaction act;
const int nofake = 0;
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;
}
i = 0;
while (subsystem_blacklist[i][0] != '\0') {
if (strcmp(subsystem, subsystem_blacklist[i]) == 0) {
dbg("don't care about '%s' devices", subsystem);
goto exit;
}
i++;
}
/* initialize udev database */
retval = udevdb_init(UDEVDB_DEFAULT);
if (retval != 0) {
dbg("unable to initialize database");
goto exit;
}
/* set signal handlers */
act.sa_handler = sig_handler;
sigemptyset (&act.sa_mask);
act.sa_flags = SA_RESTART;
sigaction(SIGINT, &act, NULL);
sigaction(SIGTERM, &act, NULL);
if (strcmp(action, "add") == 0) {
/* Already done. */
if (!is_udevstart)
namedev_init();
retval = udev_add_device(devpath, subsystem, nofake);
goto action_done;
}
if (strcmp(action, "remove") == 0) {
retval = udev_remove_device(devpath, subsystem);
goto action_done;
}
dbg("unknown action '%s'", action);
retval = -EINVAL;
action_done:
udevdb_exit();
exit:
return retval;
}
static int udev_hotplug(void)
{
char *action;
char *devpath;
char *subsystem;
action = get_action();
if (!action) {
dbg("no action?");
return -EINVAL;
}
devpath = get_devpath();
if (!devpath) {
dbg("no devpath?");
return -EINVAL;
}
/* skip blacklisted subsystems */
subsystem = get_subsystem(main_argv[1]);
if (!subsystem) {
dbg("no subsystem?");
return -EINVAL;
}
return __udev_hotplug(action, devpath, subsystem);
}
int main(int argc, char *argv[], char *envp[])
{
main_argv = argv;
main_envp = envp;
if (strstr(argv[0], "udevstart")) {
/* Setup env variables. */
setenv("UDEV_NO_SLEEP", "1", 1);
is_udevstart = 1;
}
/* initialize our configuration */
udev_init_config();
dbg("version %s", UDEV_VERSION);
if (is_udevstart) {
namedev_init();
return udev_start();
} else
return udev_hotplug();
}
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