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/*
* udev . c
*
* Userspace devfs
*
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* Copyright ( C ) 2003 , 2004 Greg Kroah - Hartman < greg @ kroah . com >
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*
* 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 0213 9 , USA .
*
*/
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# include <stdio.h>
# include <stddef.h>
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# include <stdlib.h>
# include <string.h>
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# include <ctype.h>
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# include <errno.h>
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# include <signal.h>
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# include "libsysfs/sysfs/libsysfs.h"
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# include "udev.h"
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# include "udev_lib.h"
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# include "udev_version.h"
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# include "udev_dbus.h"
[PATCH] add udev logging to info log
On Thu, Jan 15, 2004 at 05:14:16AM +0100, Kay Sievers wrote:
> On Wed, Jan 14, 2004 at 01:10:43PM -0800, Greg KH wrote:
> > On Wed, Jan 14, 2004 at 02:34:26PM -0600, Clay Haapala wrote:
> > > On Wed, 14 Jan 2004, Chris Friesen spake thusly:
> > > >
> > > > Maybe for ones with a matching rule, you could print something like:
> > > >
> > > >
> > > Is the act of printing/syslogging a rule in an of itself?
> >
> > No, as currently the only way stuff ends up in the syslog is if
> > DEBUG=true is used on the build line.
> >
> > But it's sounding like we might want to change that... :)
>
> How about this in the syslog after connect/disconnect?
>
> Jan 15 05:07:45 pim udev[28007]: configured rule in '/etc/udev/udev.rules' at line 17 applied, 'video*' becomes 'video/webcam%n'
> Jan 15 05:07:45 pim udev[28007]: creating device node '/udev/video/webcam0'
> Jan 15 05:07:47 pim udev[28015]: removing device node '/udev/video/webcam0'
Here is a slightly better version. I've created a logging.h file and
moved the debug macros from udev.h in there.
If you type:
'make' - you will get a binary that prints one or two lines to syslog
if a device node is created or deleted
'make LOG=false' - you get a binary that prints asolutely nothing
'make DEBUG=true' - the same as today, it will print all debug lines
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# include "logging.h"
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# include "namedev.h"
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# include "udevdb.h"
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/* global variables */
char * * main_argv ;
char * * main_envp ;
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# ifdef LOG
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unsigned char logname [ LOGNAME_SIZE ] ;
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void log_message ( int level , const char * format , . . . )
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{
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va_list args ;
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if ( ! udev_log )
return ;
va_start ( args , format ) ;
vsyslog ( level , format , args ) ;
va_end ( args ) ;
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}
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# endif
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static void sig_handler ( int signum )
{
switch ( signum ) {
case SIGINT :
case SIGTERM :
sysbus_disconnect ( ) ;
udevdb_exit ( ) ;
exit ( 20 + signum ) ;
default :
dbg ( " unhandled signal " ) ;
}
}
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static char * subsystem_blacklist [ ] = {
" net " ,
" scsi_host " ,
" scsi_device " ,
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" usb_host " ,
" pci_bus " ,
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" pcmcia_socket " ,
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" "
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} ;
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static int udev_hotplug ( void )
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{
char * action ;
char * devpath ;
char * subsystem ;
int retval = - EINVAL ;
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int i ;
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struct sigaction act ;
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action = get_action ( ) ;
if ( ! action ) {
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dbg ( " no action? " ) ;
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goto exit ;
}
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devpath = get_devpath ( ) ;
if ( ! devpath ) {
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dbg ( " no devpath? " ) ;
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goto exit ;
}
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dbg ( " looking at '%s' " , devpath ) ;
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/* we only care about class devices and block stuff */
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if ( ! strstr ( devpath , " class " ) & &
! strstr ( devpath , " block " ) ) {
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dbg ( " not a block or class device " ) ;
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goto exit ;
}
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/* skip blacklisted subsystems */
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subsystem = get_subsystem ( main_argv [ 1 ] ) ;
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if ( ! subsystem ) {
dbg ( " no subsystem? " ) ;
goto exit ;
}
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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 + + ;
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}
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/* connect to the system message bus */
sysbus_connect ( ) ;
[PATCH] D-BUS patch for udev-008
Attached is a patch against udev-008 to send out a D-BUS message when a
device node is added or removed.
Using D-BUS lingo, udev acquires the org.kernel.udev service and sends
out a NodeCreated or NodeDeleted signal on the
org.kernel.udev.NodeMonitor interface. Each signal carries two
parameters: the node in question and the corresponding sysfs path.
[Note: the D-BUS concepts of service, interface, object can be a bit
confusing at first glance]
An example program listening for these messages looks like this
#!/usr/bin/python
import dbus
import gtk
def udev_signal_received(dbus_iface, member, service, object_path, message):
[filename, sysfs_path] = message.get_args_list()
if member=='NodeCreated':
print 'Node %s created for %s'%(filename, sysfs_path)
elif member=='NodeDeleted':
print 'Node %s deleted for %s'%(filename, sysfs_path)
def main():
bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
bus.add_signal_receiver(udev_signal_received,
'org.kernel.udev.NodeMonitor', # interface
'org.kernel.udev', # service
'/org/kernel/udev/NodeMonitor') # object
gtk.mainloop()
if __name__ == '__main__':
main()
and this is the output when hot-plugging some usb-storage.
[david@laptop udev-008]$ ~/node_monitor.py
Node /udev/sda created for /block/sda
Node /udev/sda1 created for /block/sda/sda1
Node /udev/sda1 deleted for /block/sda/sda1
Node /udev/sda deleted for /block/sda
The patch requires D-BUS 0.20 or later while the python example program
requires D-BUS from CVS as I only recently applied a patch against the
python bindings.
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/* initialize udev database */
retval = udevdb_init ( UDEVDB_DEFAULT ) ;
if ( retval ! = 0 ) {
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dbg ( " unable to initialize database " ) ;
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goto exit_sysbus ;
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}
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/* set up a default signal handler for now */
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act . sa_handler = sig_handler ;
sigemptyset ( & act . sa_mask ) ;
act . sa_flags = SA_RESTART ;
sigaction ( SIGINT , & act , NULL ) ;
sigaction ( SIGTERM , & act , NULL ) ;
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/* initialize the naming deamon */
namedev_init ( ) ;
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if ( strcmp ( action , " add " ) = = 0 )
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retval = udev_add_device ( devpath , subsystem , 0 ) ;
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else if ( strcmp ( action , " remove " ) = = 0 )
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retval = udev_remove_device ( devpath , subsystem ) ;
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else {
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dbg ( " unknown action '%s' " , action ) ;
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retval = - EINVAL ;
}
udevdb_exit ( ) ;
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exit_sysbus :
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/* disconnect from the system message bus */
sysbus_disconnect ( ) ;
[PATCH] D-BUS patch for udev-008
Attached is a patch against udev-008 to send out a D-BUS message when a
device node is added or removed.
Using D-BUS lingo, udev acquires the org.kernel.udev service and sends
out a NodeCreated or NodeDeleted signal on the
org.kernel.udev.NodeMonitor interface. Each signal carries two
parameters: the node in question and the corresponding sysfs path.
[Note: the D-BUS concepts of service, interface, object can be a bit
confusing at first glance]
An example program listening for these messages looks like this
#!/usr/bin/python
import dbus
import gtk
def udev_signal_received(dbus_iface, member, service, object_path, message):
[filename, sysfs_path] = message.get_args_list()
if member=='NodeCreated':
print 'Node %s created for %s'%(filename, sysfs_path)
elif member=='NodeDeleted':
print 'Node %s deleted for %s'%(filename, sysfs_path)
def main():
bus = dbus.Bus(dbus.Bus.TYPE_SYSTEM)
bus.add_signal_receiver(udev_signal_received,
'org.kernel.udev.NodeMonitor', # interface
'org.kernel.udev', # service
'/org/kernel/udev/NodeMonitor') # object
gtk.mainloop()
if __name__ == '__main__':
main()
and this is the output when hot-plugging some usb-storage.
[david@laptop udev-008]$ ~/node_monitor.py
Node /udev/sda created for /block/sda
Node /udev/sda1 created for /block/sda/sda1
Node /udev/sda1 deleted for /block/sda/sda1
Node /udev/sda deleted for /block/sda
The patch requires D-BUS 0.20 or later while the python example program
requires D-BUS from CVS as I only recently applied a patch against the
python bindings.
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exit :
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if ( retval > 0 )
retval = 0 ;
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return - retval ;
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}
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int main ( int argc , char * argv [ ] , char * envp [ ] )
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{
main_argv = argv ;
main_envp = envp ;
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init_logging ( " udev " ) ;
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/* initialize our configuration */
udev_init_config ( ) ;
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dbg ( " version %s " , UDEV_VERSION ) ;
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return udev_hotplug ( ) ;
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}