174 static void	filt_pipedetach(struct knote *kn);
175 static void	filt_pipedetach_notsup(struct knote *kn);
176 static int	filt_pipenotsup(struct knote *kn, long hint);
177 static int	filt_piperead(struct knote *kn, long hint);
178 static int	filt_pipewrite(struct knote *kn, long hint);
1780 pipe_kqfilter(struct file *fp, struct knote *kn)  in pipe_kqfilter()  argument
1789 	if ((kn->kn_filter == EVFILT_READ) && !(fp->f_flag & FREAD)) {  in pipe_kqfilter()
1790 		kn->kn_fop = &pipe_nfiltops;  in pipe_kqfilter()
1793 	if ((kn->kn_filter == EVFILT_WRITE) && !(fp->f_flag & FWRITE)) {  in pipe_kqfilter()
1794 		kn->kn_fop = &pipe_nfiltops;  in pipe_kqfilter()
1799 	switch (kn->kn_filter) {  in pipe_kqfilter()
1801 		kn->kn_fop = &pipe_rfiltops;  in pipe_kqfilter()
1804 		kn->kn_fop = &pipe_wfiltops;  in pipe_kqfilter()
1815 			return (vnops.fo_kqfilter(fp, kn));  in pipe_kqfilter()
1821 	kn->kn_hook = cpipe;   in pipe_kqfilter()
1822 	knlist_add(&cpipe->pipe_sel.si_note, kn, 1);  in pipe_kqfilter()
1828 filt_pipedetach(struct knote *kn)  in filt_pipedetach()  argument
1830 	struct pipe *cpipe = kn->kn_hook;  in filt_pipedetach()
1833 	knlist_remove(&cpipe->pipe_sel.si_note, kn, 1);  in filt_pipedetach()
1839 filt_piperead(struct knote *kn, long hint)  in filt_piperead()  argument
1841 	struct file *fp = kn->kn_fp;  in filt_piperead()
1842 	struct pipe *rpipe = kn->kn_hook;  in filt_piperead()
1845 	kn->kn_data = rpipe->pipe_buffer.cnt;  in filt_piperead()
1846 	if (kn->kn_data == 0)  in filt_piperead()
1847 		kn->kn_data = rpipe->pipe_pages.cnt;  in filt_piperead()
1852 		kn->kn_flags |= EV_EOF;  in filt_piperead()
1855 	kn->kn_flags &= ~EV_EOF;  in filt_piperead()
1856 	return (kn->kn_data > 0);  in filt_piperead()
1861 filt_pipewrite(struct knote *kn, long hint)  in filt_pipewrite()  argument
1863 	struct pipe *wpipe = kn->kn_hook;  in filt_pipewrite()
1874 			kn->kn_data = 0;  in filt_pipewrite()
1876 			kn->kn_data = wpipe->pipe_buffer.size -  in filt_pipewrite()
1879 			kn->kn_data = PIPE_BUF;  in filt_pipewrite()
1885 		kn->kn_flags |= EV_EOF;  in filt_pipewrite()
1888 	kn->kn_flags &= ~EV_EOF;  in filt_pipewrite()
1889 	return (kn->kn_data >= PIPE_BUF);  in filt_pipewrite()
1893 filt_pipedetach_notsup(struct knote *kn)  in filt_pipedetach_notsup()  argument
1899 filt_pipenotsup(struct knote *kn, long hint)  in filt_pipenotsup()  argument