gfs_pio_truncate - truncate a file to a specified length
char *gfs_pio_truncate (GFS_File gf, file_offset_t length);
The gfs_pio_truncate() function truncates the regular file gf to the
If the file was previously shorter than the length, it is extended, and
the extended part is filled by zero bytes.
The file pointer is not changed.
You must specify GFS_FILE_MODE_WRITE in opening the file, because it
must be open for writing.
NULL The function terminated successfully.
Insufficient memory was available.
Others An error except the above occurred. The reason is shown by its