173 static void	filt_pipedetach(struct knote *kn);
174 static void	filt_pipedetach_notsup(struct knote *kn);
175 static int	filt_pipenotsup(struct knote *kn, long hint);
176 static int	filt_piperead(struct knote *kn, long hint);
177 static int	filt_pipewrite(struct knote *kn, long hint);
178 static int	filt_pipedump(struct proc *p, struct knote *kn,
1784 pipe_kqfilter(struct file *fp, struct knote *kn)  in pipe_kqfilter()  argument
1793 	if ((kn->kn_filter == EVFILT_READ) && !(fp->f_flag & FREAD)) {  in pipe_kqfilter()
1794 		kn->kn_fop = &pipe_nfiltops;  in pipe_kqfilter()
1797 	if ((kn->kn_filter == EVFILT_WRITE) && !(fp->f_flag & FWRITE)) {  in pipe_kqfilter()
1798 		kn->kn_fop = &pipe_nfiltops;  in pipe_kqfilter()
1803 	switch (kn->kn_filter) {  in pipe_kqfilter()
1805 		kn->kn_fop = &pipe_rfiltops;  in pipe_kqfilter()
1808 		kn->kn_fop = &pipe_wfiltops;  in pipe_kqfilter()
1819 			return (vnops.fo_kqfilter(fp, kn));  in pipe_kqfilter()
1825 	kn->kn_hook = cpipe;   in pipe_kqfilter()
1826 	knlist_add(&cpipe->pipe_sel.si_note, kn, 1);  in pipe_kqfilter()
1832 filt_pipedetach(struct knote *kn)  in filt_pipedetach()  argument
1834 	struct pipe *cpipe = kn->kn_hook;  in filt_pipedetach()
1837 	knlist_remove(&cpipe->pipe_sel.si_note, kn, 1);  in filt_pipedetach()
1843 filt_piperead(struct knote *kn, long hint)  in filt_piperead()  argument
1845 	struct file *fp = kn->kn_fp;  in filt_piperead()
1846 	struct pipe *rpipe = kn->kn_hook;  in filt_piperead()
1849 	kn->kn_data = rpipe->pipe_buffer.cnt;  in filt_piperead()
1850 	if (kn->kn_data == 0)  in filt_piperead()
1851 		kn->kn_data = rpipe->pipe_pages.cnt;  in filt_piperead()
1856 		kn->kn_flags |= EV_EOF;  in filt_piperead()
1859 	kn->kn_flags &= ~EV_EOF;  in filt_piperead()
1860 	return (kn->kn_data > 0);  in filt_piperead()
1865 filt_pipewrite(struct knote *kn, long hint)  in filt_pipewrite()  argument
1867 	struct pipe *wpipe = kn->kn_hook;  in filt_pipewrite()
1878 			kn->kn_data = 0;  in filt_pipewrite()
1880 			kn->kn_data = wpipe->pipe_buffer.size -  in filt_pipewrite()
1883 			kn->kn_data = PIPE_BUF;  in filt_pipewrite()
1889 		kn->kn_flags |= EV_EOF;  in filt_pipewrite()
1892 	kn->kn_flags &= ~EV_EOF;  in filt_pipewrite()
1893 	return (kn->kn_data >= PIPE_BUF);  in filt_pipewrite()
1897 filt_pipedetach_notsup(struct knote *kn)  in filt_pipedetach_notsup()  argument
1903 filt_pipenotsup(struct knote *kn, long hint)  in filt_pipenotsup()  argument
1910 filt_pipedump(struct proc *p, struct knote *kn,  in filt_pipedump()  argument
1913 	struct pipe *pipe = kn->kn_hook;  in filt_pipedump()