pipe
====

POSIX specification:
 https://pubs.opengroup.org/onlinepubs/9699919799/functions/pipe.html

Gnulib module: pipe-posix

Portability problems fixed by Gnulib:

  * This function is missing on some platforms: mingw, MSVC 14.

Portability problems not fixed by Gnulib:

  * This function crashes rather than failing with EMFILE if no resources are left on some platforms: Cygwin 1.7.9.