Very Computer

I need to execute a shell script trough pipe.
I call popen("./something.sh, SZ_READ);
cat something.sh
dd if=/dev/...

I need to catch dd's exit status.
TIA

echo $?  in ksh
echo $status in csh
echo $? in bourne sh

--Nithyanand.
  Siemens, Bangalore, India.

Hi
I'm not sure
but woold the following help

dd if=/dev/... || exit $?

inside the shell script or schould it be also runable without your program
than i would put it like this

dd if=/dev/... && DD_sucess=$?
if [ "$DD_ABBORT_IMMIDEATLY" == "YES" ] && [ $DD_success -ne 0 ];then
   exit $DD_sucess
fi

and you will have to set the environment for your popen so that when
calling the script contains
the  `DD_ABBORT_IMMIDEATLY' variable to `YES' in order to make the
script return immediatly after dd
or any safe place in your script with the exitstatus of the first/last
failed dd

cu
Christoph

ps.; wouldn't it be much safer to fork a subprocess and call dd there
via exec function ???

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CONCLUSION: Scientists do what he wants, willing or not:)

Assuming you mean a bourne shell (if csh x=$status).  The following assumes
that you want to do more processing after the dd command, but saves the
exit status of dd so you can return it to popen().  

Quote:> I need to execute a shell script trough pipe.
> I call popen("./something.sh, SZ_READ);
> cat something.sh
> dd if=/dev/...

x=$?

...

exit $x

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| I call popen("./something.sh, SZ_READ);
| cat something.sh
| dd if=/dev/...
| I need to catch dd's exit status.

This is what pclose() is for.

     A stream opened by popen should be closed by pclose, which waits
     for the associated process to terminate and returns the exit
     status of the command.

If `dd' is not the last command in the script, save the exit status in
the script and exit with that status later as suggested in a different
message in this thread.

R'

On Fri, 15 Jun 2001 09:58:20 +0200, Norbert Lakatos

Tnx to all of you!
At the end I used the return value from pclose() and it now works OK.