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From: jh@pcsbst.UUCP
Newsgroups: comp.unix.wizards
Subject: Re: Combined fork/exec - (nf)
Message-ID: <4300001@pcsbst.UUCP>
Date: Mon, 5-Oct-87 13:57:00 EDT
Article-I.D.: pcsbst.4300001
Posted: Mon Oct  5 13:57:00 1987
Date-Received: Sat, 10-Oct-87 05:56:28 EDT
References: <9424@brl-adm.UUCP>
Lines: 15
Nf-ID: #R:brl-adm:-942400:pcsbst:4300001:000:625
Nf-From: pcsbst!jh    Oct  5 18:57:00 1987

We did a forkexecve() implementation here at PCS a long time
ago. We used the execve() parameters and succeded in combining
the semantics of fork() and execve().

This was a not big job. The complicated thing was to modify the
sh to use this system call instead of fork() and execve(),
because it sometimes does a lot of things inbetween the fork()
and the execve() which actually may be done before the fork.
A proper use of the "close-on-exec" flag helps. Sometimes, however,
the fork() can (and should) not be eliminated because the shell
executes a shell script and does no execve().

		Johannes Heuft

		unido!pcsbst!jh