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Old 03-05-2007, 05:31 AM   #1
asahlot
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Registered: Sep 2005
Location: india
Distribution: Fedora Core 2
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How to know whether a dev file has been opened or not?


Hi All

Inside my driver init code I want to know whether a dev file like /dev/video has been opened by some application or not?
How can I do that?
Could any body please help? I need to know urgently.
Thanks in advance.

ASAHLOT
 
Old 03-05-2007, 05:59 AM   #2
akudewan
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Registered: Apr 2004
Location: India
Distribution: Ubuntu
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I think the "lsof" bash command can do this.

For instance, when I run: lsof /dev/snd/* I get this output:
Code:
akudewan@ranjan404:~ $ lsof /dev/snd/*
COMMAND  PID     USER   FD   TYPE DEVICE SIZE NODE NAME
kicker  5660 akudewan   13u   CHR  116,8      7874 /dev/snd/controlC0
gkrellm 5701 akudewan    9u   CHR  116,8      7874 /dev/snd/controlC0
Edit: Note that kicker and gkrellm have volume control applets

Last edited by akudewan; 03-05-2007 at 06:01 AM.
 
Old 03-05-2007, 11:02 PM   #3
asahlot
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Registered: Sep 2005
Location: india
Distribution: Fedora Core 2
Posts: 62

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But I cannot run any command inside module init code.
 
  


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