2010/3/29 Dinar Talypov <di...@yantel.ru>:
> While looking at the code found that some flags are not documented in
> fork1(9), but used.
> These are:
> - FORK_SIGHAND
> - FORK_PTRACE
> - FORK_THREAD
>
> Can someone point out what they are?
Thank you for pointing out the doc absence!
To quote the just committed manpage update:
FORK_SIGHAND The child will share the parent's signal actions, in-
cluding the handler, mask, and flags, with
sigactsshare(). The default behavior is to copy the
signal actions from the parent with sigactsinit().
FORK_SHAREVM must also be set.
FORK_PTRACE The child will start with tracing enabled, as if
ptrace(PT_TRACE_ME, 0, 0, 0) had been invoked in the
child.
FORK_THREAD The child will instead be a kernel-level thread in the
same process as the parent. FORK_NOZOMBIE,
FORK_SHAREVM, and FORK_SIGHAND must also be set. If the
kernel option RTHREADS isn't enabled then the call will
return ENOTSUP.
(And yes, the RTHREADS kernel option is now documented some too.)
Philip Guenther
