On Wed, 2008-10-22 at 17:12 +0100, Alan Jenkins wrote:
> > The pipe2() syscall allows you to specify flags for the returned file
> > descriptors:
> >
> > pipe2 (&fds, O_CLOEXEC)
> >
>
> Ah! I see how it's supposed to be used now.
>
> pipe2 (&fds, O_CLOEXEC)
> if (fork() == 0) {
> dup2(&fds[WRITE_END], STDOUT_FILENO);
> /* insert call to fcntl to remove O_CLOEXEC */
> exec(program_name);
>
You don't need the call to fcntl. From the dup2(2) manpage:
The two descriptors do not share file descriptor flags (the close-on-
exec flag). The close-on-exec flag (FD_CLOEXEC; see fcntl(2)) for the
duplicate descriptor is off.
So after you dup2() the writing end to standard output, standard output
will not be closed on exec.
Scott
--
Scott James Remnant
scott@xxxxxxxxxxxxx
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