fcntl
=====

POSIX specification:
 http://www.opengroup.org/onlinepubs/9699919799/functions/fcntl.html

Gnulib module: fcntl

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: mingw, MSVC 9.

  * This function does not support F_DUPFD_CLOEXEC on some platforms: MacOS X 10.5, FreeBSD 6.0, NetBSD 5.0, OpenBSD 3.8, AIX 5.1, HP-UX 11, IRIX 6.5, OSF/1 5.1, Solaris 11 2010-11, Cygwin 1.7.1, Interix 3.5, BeOS. Note that the gnulib replacement code is functional but not atomic.

  * The F_DUPFD action of this function does not reject out-of-range targets properly on some platforms: Cygwin 1.5.x, Haiku.

  * The F_DUPFD action of this function mistakenly clears FD_CLOEXEC on the source descriptor on some platforms: Haiku.

Portability problems not fixed by Gnulib:

  * The replacement function does not support F_SETFD, F_GETFL, F_SETFL, F_GETOWN, F_SETOWN, F_GETLK, F_SETLK, and F_SETLKW on some platforms: mingw, MSVC 9.