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tmpfile
POSIX specification:
https://pubs.opengroup.org/onlinepubs/9699919799/functions/tmpfile.html
Gnulib module: tmpfile
Portability problems fixed by Gnulib:
off_t
is a 32-bit type, tmpfile
may not work
correctly to create files 2 GiB and larger. See Large File Support.
Portability problems not fixed by Gnulib: