Hi Mathias,
On Fri, Jul 18, 2008 at 01:46:54AM +0200, Mathias Kende wrote:
> The current setsid utility forks a new process only if its process is
> group leader.
sure, setsid(2) does not work for group leaders
> But for setsid to work, it needs to spawn a new process in
> any case.
I don't think so. The setsid(1) does not need to fork when the
process is not session leader. It simply calls setsid(2) and creates a
new session. The purpose of the util is "create a new session" and
nothing other.
> -----
> all:
> setsid cat
> -----
> While calling directly "setsid cat" from a shell will return immediatly.
sure, because the interactive shell creates a new session (to control
jobs) and when you ask for a next new session (by setsid(1)) you need
an extra fork().
Karel
--
Karel Zak <kzak@xxxxxxxxxx>
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