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

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  Date : 2019-09-22T23:23:20
  

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• doc/posix-functions/select.texi

• @node select
  @section @code{select}
  @findex select
  
  POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/select.html}
  
  Gnulib module: select
  
  Portability problems fixed by Gnulib:
  @itemize
  @item
  On Windows platforms (excluding Cygwin), @code{select} can only be
  called on descriptors created by the @code{socket} function, not on regular
  file descriptors.
  @item
  On Windows platforms (excluding Cygwin), error codes from this function
  are not placed in @code{errno}, and @code{WSAGetLastError} must be used
  instead.
  @item
  On some platforms, this function fails to detect invalid fds with
  EBADF, but only if they lie beyond the current maximum open fd:
  FreeBSD 8.2.
  @end itemize
  
  Portability problems not fixed by Gnulib:
  @itemize
  @item
  When you call @code{select} with a timeout, some implementations modify the
  timeout parameter so that upon return from the function, it contains the
  amount of time not slept.  Other implementations leave the timeout parameter
  unmodified.
  @item
  Under Windows, when passing a pipe, Gnulib's @code{select} replacement might
  return 0 even before the timeout has passed.  Programs using it with pipes can
  thus busy wait.
  @item
  On Linux, when some file descriptor refers to a regular file, @code{select}
  may fail, setting @code{errno} to @code{EBADF}.
  @end itemize
  

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