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Postings from May 2010
Quoth xdaveg@gmail.com (David Golden):
> On Tue, May 11, 2010 at 6:15 PM, Kevin Ryde <perlbug-followup@perl.org> wrote:
> > Run a program or a shell command and return its exit status.
> > C<SIGINT> and C<SIGQUIT> act on the child but are ignored by the
> > Perl parent. The parameters are the same as for C<exec LIST>.
> > Note that argument processing varies depending on the number of
> > arguments ...
>
> There are some subtle portability issues in that statement, since
> Win32 emulates the signals and a CTRL-C sends a signal that reaches
> all processes attached to the console, including the parent.
The whole of the first paragraph of perldoc -f system is unportable.
Non-Unix systems don't use fork/exec at all, and many Unixes use vfork,
for instance.
I feel a better approach to system/exec would be to document system
first ('runs an external command as a separate process'), and then
document exec as 'like system, but replaces the current process instead
of creating a new one'.
Ben
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