dio_open Opens a new filename with specified permissions of flags and creation permissions of mode &reftitle.description; resourcedio_open stringfilename intflags intmode dio_open opens a file and returns a new file descriptor for it. &reftitle.parameters; filename The opened file. flags The flags parameter can also include any combination of the following flags: O_CREAT - creates the file, if it doesn't already exist. O_EXCL - if both, O_CREAT and O_EXCL are set, dio_open fails, if the file already exists. O_TRUNC - if the file exists, and its opened for write access, the file will be truncated to zero length. O_APPEND - write operations write data at the end of the file. O_NONBLOCK - sets non blocking mode. mode If flags is O_CREAT, mode will set the mode of the file (creation permissions). O_RDONLY - opens the file for read access. O_WRONLY - opens the file for write access. O_RDWR - opens the file for both reading and writing. &reftitle.returnvalues; A file descriptor or &false; on error. &reftitle.examples; ]]> &reftitle.seealso; dio_close