taglinefilesource code
fasync_helper100drivers/char/atixlmouse.cretval = fasync_helper(inode, filp, on, &mouse.fasync);
fasync_helper110drivers/char/busmouse.cretval = fasync_helper(inode, filp, on, &mouse.fasyncptr);
fasync_helper87drivers/char/msbusmouse.cretval = fasync_helper(inode, filp, on, &mouse.fasyncptr);
fasync_helper292drivers/char/psaux.cretval = fasync_helper(inode, filp, on, &queue->fasync);
fasync_helper1288drivers/char/tty_io.cretval = fasync_helper(inode, filp, on, &tty->fasync);
fasync_helper312include/linux/fs.hextern int fasync_helper(struct inode *, struct file *, int, struct fasync_struct **);