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From: john@genrad.UUCP (John Nelson)
Newsgroups: net.unix
Subject: Re: Which *nix ? BSD : System V
Message-ID: <692@genrad.UUCP>
Date: Sun, 3-Mar-85 14:16:01 EST
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Posted: Sun Mar  3 14:16:01 1985
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As an alternative to including , here is something that works
MUCH BETTER.

Include .  V7 systems do not have any signal which indicates a
child process has terminated.  Both SIII and SV call that signal SIGCLD.
All berkeley systems have an equivalent signal, but call it SIGCHLD.

 has other goodies for system differention.  I always use SIGSTOP
to check for job control, and SIGVTALRM for 4.2 BSD exclusivity.