On Tue, 2005-01-25 at 11:34, Uri Guttman wrote:
> >>>>> "GL" == Greg London <[EMAIL PROTECTED]> writes:
> GL> After the system call, how do I test for a control-c
> GL> as the cause for the command ending?
>
> look at $@ and check for why the process died. you can extract a signal
> number from it (shift 8 bits and mask IIRC, rtfm for details. i think
> perlvar covers it).
This is incorrect. $@ is for eval, $? is for system.
> GL> Oh, and I can't simply say
>
> GL> system('cp -r longtree dest')==0 or die $@;
>
> GL> because some system commands will fail because the
> GL> directory doesn't exist or something, and in those
> GL> cases, I want the script to keep going.
>
> just check for SIGINT and handle that.
You're correct, but that's not clear to the uninitiated. Here's the
explanation:
$? contains the exit status of the program. On POSIX-compliant systems
this is a number which is:
($exit << 8) | $signal
Where $exit is the parameter that the program passed to exit(2), and
$signal is the signal that interrupted the process, if any.
You can check to see if the process was killed by:
if ($? & 0xff) {
die "Process killed by signal ".($? & 0xff);
} elsif ($? >> 8) {
die "Process exited with status ".($? >> 8);
} else {
# Worked fine
}
Make sense?
This is also a faq, so you can type:
perldoc -q control-c
to see what the lord of the FAQ says ;-)
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