2009-06-04 02:28:06     Issue with Script file for Hot plug

2009-06-04 02:28:06     Issue with Script file for Hot plug

Narendra Nath (INDIA)

Message: 75140   

Hi

    I have enabled hotplug for USB .The following is script file i am using

#!/bin/sh

output=/dev/ttyBF0

/bin/mdev > $output

echo $DEVPATH | grep sda

if [ $? -ne 0 ]

then

exit 0

fi

echo "Hotplug Script" > $output

echo $ACTION $output

if [ "$(ACTION)" = "add" ]

then

echo "USB Inserted" > $output

fi

if [ "$(ACTION)" = "remove" ]

then

echo "USB Remove" > $output

fi

Now that i am enable to get Hotplug Script  but USB inserted /USB removed is not coming.So is that missing from my side for hot plug to detect ADD/Remove action .Please suggest me.

Best Regards

Narendra

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2009-06-04 03:01:59     Re: Issue with Script file for Hot plug

Mike Frysinger (UNITED STATES)

Message: 75141   

your shell script is wrong.  $(...) is for subshells, not variables like ${...}.

otherwise, are you sure your hardware is working ?  are you getting the mass storage debug messages on the console from the kernel itself ?

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2009-06-04 06:01:23     Re: Issue with Script file for Hot plug

Narendra Nath (INDIA)

Message: 75205   

Hi Mike

        Thanks for your inputs.I corrected and its working .Now that here i have two issues

1.Right now i am entering script through command line,i want to include that script  in my code.how can i include this script into my code either in kernel or my application(C file).

2.Is there any way this script sends a message/signal to my application saying that USB is been attached/reemoved.

Please help me in this regard

Narendra

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2009-06-04 06:10:08     Re: Issue with Script file for Hot plug

Mike Frysinger (UNITED STATES)

Message: 75207   

i dont really know what you mean by "include in my code".  you'll have to be more specific and/or describe what you're actually trying to do.

as for communicating with another process, any more IPC method will work.  there isnt anything special going on here to prevent that.  the easiest method is probably to send a custom signal like `killall -USR1 yourapp`.

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2009-06-05 01:50:16     Re: Issue with Script file for Hot plug

Narendra Nath (INDIA)

Message: 75224   

Hi Mike

  1.      As a script file i included the following in script file

#!/bin/sh

echo /salonusb.sh > /proc/sys/kernel/hotplug

cat /proc/sys/kernel/hotplug

cat >salonusb.sh

when i try to run the script file i am getting following error

: cannot createl/hotplug

: No such file or directoryug

2.    Also i tried to use kill all with following in my application

int main()

  {

      struct dirent *entry;

       struct sigaction act;

       memset (&act, '\0', sizeof(act));

      act.sa_sigaction = &hdl;

      act.sa_flags = SA_SIGINFO;

      sigaction(SIGUSR2, &act, NULL);

}

2 static void hdl (int sig, siginfo_t *siginfo, void *context)

{

       printf("Signal received from kernel");

}

I gave killall -USR2 Myapp

and the result i got is killall: Myapp: no process killed

Please suggest me to sort tout these two

Best Regards

Narendra