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

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• Hash : 20a4d1d3
  Author :
  Date : 2012-09-13T08:55:08
  

  poll: fix for systems that can't recv() on a non-socket
  
  * lib/poll.c: if recv returns ENOTSOCK, assume the descriptor
  is readable.  In this case POLLHUP will not be supported.
  * doc/posix-functions/poll.texi: Document this.
  
  Copyright-paperwork-exempt: yes
  

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• doc/posix-functions/poll.texi

• @node poll
  @section @code{poll}
  @findex poll
  
  POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/poll.html}
  
  Gnulib module: poll
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  This function is missing on some platforms:
  mingw, MSVC 9, BeOS, HP NonStop.
  @item
  This function doesn't work on special files like @file{/dev/null} and ttys like
  @file{/dev/tty} on some platforms:
  Mac OS X 10.4.0, AIX 5.3.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  Under BeOS, Gnulib's @code{poll} replacement can only be called on descriptors
  created by the @code{socket} function, not on regular file descriptors.
  
  @item
  Under Windows, when passing a pipe, Gnulib's @code{poll} replacement might
  return 0 even before the timeout has passed.  Programs using it with pipes can
  thus busy wait.
  
  @item
  Under HP NonStop, file descriptors other than sockets do not support
  POLLHUP; they will return a "readable" status instead.
  @end itemize
  

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