From owner-cvs-all  Tue Mar 21 19: 2: 0 2000
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From: Brian Somers <brian@FreeBSD.org>
Date: Tue, 21 Mar 2000 19:01:55 -0800 (PST)
To: cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject: cvs commit: src/usr.sbin/ppp exec.c
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brian       2000/03/21 19:01:55 PST

  Modified files:
    usr.sbin/ppp         exec.c 
  Log:
  Do some vfork() trickery so that the parent can determine
  if the childs exec() has succeeded or failed by taking advantage
  of the fact that both processes share the same memory.
  
  FWIW:
    I tried to implement this by doing a pipe(), setting the
    write desciptors close-on-exec flag in the child and writing
    errno to the descriptor if the exec() fails.  The parent can
    then ``if (read()) got errno else exec worked''.
  
    This didn't work though - the child could write() to fd[1] on
    exec failure, but the parent got 0 trying to read() from fd[0] !
    Is this a bug in execve() ?
  
  Revision  Changes    Path
  1.21      +38 -8     src/usr.sbin/ppp/exec.c



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