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9.352 ftruncate

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

Gnulib module: ftruncate

Portability problems fixed by Gnulib:

• This function is missing on some platforms: MSVC 14.
• On platforms where off_t is a 32-bit type, this function is not applicable to arbitrary lengths for files larger than 2 GB. The fix is to use the AC_SYS_LARGEFILE macro.

Portability problems not fixed by Gnulib: