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10.369 fseek

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

Gnulib module: fseek

Portability problems fixed by Gnulib:

• This function mistakenly succeeds on pipes on some platforms: mingw, MSVC 14.

Portability problems not fixed by Gnulib:

• On Windows platforms (excluding Cygwin), this function does not set errno upon failure.
• On platforms where long is a 32-bit type, fseek does not work correctly with files 2 GiB and larger, even when the AC_SYS_LARGEFILE macro is used. The fix is to use fseeko instead.