From mboxrd@z Thu Jan  1 00:00:00 1970
From: rpjday@crashcourse.ca (Robert P. J. Day)
Date: Wed, 1 Apr 2015 07:43:05 -0400 (EDT)
Subject: what is the precise udev event that handles miscdevices?
Message-ID: <alpine.LFD.2.11.1504010738510.14126@localhost>
To: kernelnewbies@lists.kernelnewbies.org
List-Id: kernelnewbies.lists.kernelnewbies.org


  i can trivially create misc character devices, and i know special
device files for them will automatically show up under /dev, but what
is the precise udev event/rule that comes into play for this?

  if i start to monitor udevadm with:

$ udevadm monitor --kernel --udev --property

and insert my misc char module, i see:

KERNEL[5342.740294] add      /module/mymisc (module)
ACTION=add
DEVPATH=/module/mymisc
SEQNUM=3007
SUBSYSTEM=module

KERNEL[5342.740528] add      /devices/virtual/misc/mymisc (misc)
ACTION=add
DEVNAME=/dev/mymisc
DEVPATH=/devices/virtual/misc/mymisc
MAJOR=10
MINOR=55
SEQNUM=3008
SUBSYSTEM=misc

UDEV  [5342.741071] add      /module/mymisc (module)
ACTION=add
DEVPATH=/module/mymisc
SEQNUM=3007
SUBSYSTEM=module
USEC_INITIALIZED=740419

UDEV  [5342.741921] add      /devices/virtual/misc/mymisc (misc)
ACTION=add
DEVNAME=/dev/mymisc
DEVPATH=/devices/virtual/misc/mymisc
MAJOR=10
MINOR=55
SEQNUM=3008
SUBSYSTEM=misc
USEC_INITIALIZED=740750

so, yes, i can see the line "DEVNAME=/dev/mymisc", but is there
something i can point at in the collection of udev rules that deals
with that? or is that simply done internally?

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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