ftruncate
=========

POSIX specification:
 http://www.opengroup.org/onlinepubs/9699919799/functions/ftruncate.html

Gnulib module: ---

Portability problems fixed by Gnulib:

Portability problems not fixed by Gnulib:

  * 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.