int creat( const char *filename, int permis )

	- prototype in io.h, also include stat.h

	- creates new file (overwrites existing file) of filename
	  with access permission "permis" which is:

		S_IWRITE
		S_IREAD
		S_IWRITE | S_IREAD

	  for permission to write, read or read/write.

	- file is created set to _fmode (O_TEXT or O_BINARY)