kc3-lang/gnulib/doc/posix-functions/dup2.texi

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• Hash : b5b8e4ac
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  Date : 2009-10-09T21:28:40
  

  dup2: work around FreeBSD 6.1 bug
  
  dup2(1,1000000) needs to fail with EBADF (per POSIX), not
  EMFILE, based on our usage of it in other modules.
  
  * m4/dup2.m4 (gl_FUNC_DUP2): Detect bug.
  * doc/posix-functions/dup2.texi (dup2): Document it.
  Reported by Nelson H. F. Beebe and Jim Meyering.
  
  Signed-off-by: Eric Blake <ebb9@byu.net>
  

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• doc/posix-functions/dup2.texi

• @node dup2
  @section @code{dup2}
  @findex dup2
  
  POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
  
  Gnulib module: dup2
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  This function always returns 0 for success on some platforms:
  mingw.
  
  @item
  This function can hang when duplicating an fd to itself on some platforms:
  mingw.
  
  @item
  This function returns 0 for @code{dup2 (1, 1)} on some platforms:
  Cygwin 1.5.x.
  
  @item
  This function may return @code{-EBADF} instead of @code{-1} on some platforms:
  Linux releases between July 2008 and May 2009 (versions 2.6.27 to 2.6.29).
  
  @item
  This function returns @code{EMFILE} instead of @code{EBADF} for
  extremely large targets, which interferes with using
  @code{dup2(fd,fd)==fd)} as the minimal @code{EBADF} filter:
  FreeBSD 6.1, Cygwin 1.5.
  
  @item
  This function is missing on some older platforms.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @end itemize
  

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