os_open_file
ret = os_open_file(dsp, of_set_rw(OPENFLAGS(), r, w), 0);
ret = os_open_file(mixer, of_set_rw(OPENFLAGS(), r, w), 0);
err = os_open_file("/dev/random", of_read(OPENFLAGS()), 0);
fd = os_open_file(ubd_dev->file, of_read(OPENFLAGS()), 0);
fd = os_open_file(file, *openflags, mode);
fd = os_open_file(file, *openflags, mode);
ffd = os_open_file(filename, of_read(OPENFLAGS()), 0);
extern int os_open_file(const char *file, struct openflags flags, int mode);
EXPORT_SYMBOL(os_open_file);
fd = os_open_file(filename, of_read(OPENFLAGS()), 0);