> > I call external programs with system(). It used to return the correct
> > value i.e. zero if there is no error and a non-zero value otherwise.
> > Recently, it always returns -1 even if the external programs work fine.
> > What could be the reason?
>
>
> From perldoc -f system:
>
> The return value is the exit status of the program
> as returned by the "wait" call. To get the actual
> exit value divide by 256. See also "exec". This
> is not what you want to use to capture the output
> from a command, for that you should use merely
> backticks or "qx//", as described in "`STRING`" in
> perlop. Return value of -1 indicates a failure to
> start the program (inspect $! for the reason).
>
>
> So apparently the call to the external program is not working fine.
Surely
> you don't think perl is incorrect.
$! says 'No child processes'. Does that have something to do with having
$SIG{CHLD} = 'IGNORE';
in the code?
Thanks,
--Ahmed
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