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

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• Hash : 4a2a66e4
  Author :
  Date : 2011-04-25T19:45:09
  

  dup2: Remove check for dup2, unless supporting old obsolete platforms.
  
  * modules/dup2-obsolete: New file.
  * m4/dup2-obsolete.m4: New file.
  * m4/dup2.m4 (gl_FUNC_DUP2): Don't check whether dup2 exists if
  gl_FUNC_DUP2_OBSOLETE is not also defined.
  * modules/dup2 (Depends-on): Add dup2-obsolete.
  * doc/posix-functions/dup2.texi: Mention module dup2-obsolete.
  

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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 or dup2-obsolete
  
  Portability problems fixed by either Gnulib module @code{dup2} or @code{dup2-obsolete}:
  @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 resets the @code{FD_CLOEXEC} flag when duplicating an fd
  to itself on some platforms:
  Haiku.
  
  @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.
  @end itemize
  
  Portability problems fixed by Gnulib module @code{dup2-obsolete}:
  @itemize
  @item
  This function is missing on some older platforms.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @end itemize
  

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