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From: Jilles Tjoelker <jilles@FreeBSD.org>
Date: Tue, 23 Jun 2009 21:50:06 +0000 (UTC)
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Subject: cvs commit: src/bin/sh eval.c
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jilles      2009-06-23 21:50:06 UTC

  FreeBSD src repository

  Modified files:
    bin/sh               eval.c 
  Log:
  SVN rev 194774 on 2009-06-23 21:50:06Z by jilles
  
  Do not fork for a subshell if it is the last thing this shell is doing
  (EV_EXIT). The fork is still done as normal if any traps are active.
  
  In many cases, the fork can be avoided even without this change by using {}
  instead of (), but in practice many scripts use (), likely because the
  syntax is simpler.
  
  Example:
    sh -c '(/bin/sleep 10)& sleep 1;ps -p $! -o comm='
  Now prints "sleep" instead of "sh". $! is more useful this way.
  Most shells (dash, bash, pdksh, ksh93, zsh) seem to print "sleep" for this.
  
  Example:
    sh -c '( ( ( (ps jT))))'
  Now shows no waiting shell processes instead of four.
  Most shells (dash, bash, pdksh, ksh93, zsh) seem to show zero or one.
  
  PR:             bin/74404
  Approved by:    ed (mentor) (implicit)
  
  Revision  Changes    Path
  1.63      +2 -2      src/bin/sh/eval.c