[ksh93-integration-discuss] Should ksh93/libshelluse|posix_spawn()| instead of |vfork()| ?

[Glenn Fowler]

if you look close at the iffe test it says something like
"posix spawn works and is worth using"
part of the test checks to see if the native posix_spawn()
implementation uses fork() (there are some implementations that do)
needless to say, those implementations are deemed "not worth using"
when vfork() is available and works like vfork() should

I don't know if this is the case for the system you built ksh on

-- Glenn Fowler -- AT&T Research, Florham Park NJ --

On Mon, 30 Oct 2006 04:58:32 +0100 Roland Mainz wrote:
> Alan Coopersmith wrote:
> > Roland Mainz wrote:
> > > ... which raises the question whether ksh93 should (or could) use
> > > |posix_spawn()| instead of |vfork()|
> > 
> > I had the same thought a couple of weeks ago, but then I plugged
> > "posix_spawn ksh93" into a google search and one of the top hits
> > was:
> > 
> > package changes from 2002-12-21 to 2003-04-22
> > ... ksh93 was modified to accept :% as equivalent to % and :# as equivalent to
> > ... comp/spawnveg.c: call posix_spawn() if implemented comp/omitted.c: add ...
> > www.research.att.com/~gsf/download/release.2003-04-22.2002-12-21.html

> Ouch... sometimes it helps to read the changelogs... ;-/
> ... however I checked it via "dbx" and it seems that at leaszt
> ast.ksh-2006-09-12 uses |vfork()| when executing an external command
> (like /usr/bin/ls) ... ;-(

> ----

> Bye,
> Roland

> -- 
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