- open-write filenameprocedure
Open a file for writing.
Open a file for writing, in platform-independent notation and in relation to the write dir as the root of the writable filesystem. The specified file is created if it doesn't exist. If it does exist, it is truncated to zero bytes, and the writing offset is set to the start.
Note that entries that are symlinks are ignored if (permitSymbolicLinks #t) hasn't been called, and opening a symlink with this function will fail in such a case.