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10.207 dup

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

Gnulib module: dup

Portability problems fixed by Gnulib:

• This function is declared in a different header file (namely, <io.h>) on some platforms: MSVC 14.
• This function crashes when invoked with invalid arguments on some platforms: MSVC 14.

Portability problems not fixed by Gnulib: