_exit
=====

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

Gnulib module: unistd

Portability problems fixed by Gnulib:

  * This function is declared in a different header file (namely, <stdlib.h>) on some platforms: mingw, MSVC 14.

Portability problems not fixed by Gnulib: