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-rw-r--r--sys/sys/ttydisc.h105
1 files changed, 105 insertions, 0 deletions
diff --git a/sys/sys/ttydisc.h b/sys/sys/ttydisc.h
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+++ b/sys/sys/ttydisc.h
@@ -0,0 +1,105 @@
+/*-
+ * Copyright (c) 2008 Ed Schouten <ed@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Portions of this software were developed under sponsorship from Snow
+ * B.V., the Netherlands.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * $FreeBSD$
+ */
+
+#ifndef _SYS_TTYDISC_H_
+#define _SYS_TTYDISC_H_
+
+#ifndef _SYS_TTY_H_
+#error "can only be included through <sys/tty.h>"
+#endif /* !_SYS_TTY_H_ */
+
+struct cv;
+struct thread;
+struct tty;
+struct uio;
+
+/* Top half routines. */
+void ttydisc_open(struct tty *);
+void ttydisc_close(struct tty *);
+int ttydisc_read(struct tty *, struct uio *, int);
+int ttydisc_write(struct tty *, struct uio *, int);
+void ttydisc_optimize(struct tty *);
+
+/* Bottom half routines. */
+void ttydisc_modem(struct tty *, int);
+#define ttydisc_can_bypass(tp) ((tp)->t_flags & TF_BYPASS)
+int ttydisc_rint(struct tty *, char, int);
+size_t ttydisc_rint_bypass(struct tty *, char *, size_t);
+void ttydisc_rint_done(struct tty *);
+size_t ttydisc_getc(struct tty *, void *buf, size_t);
+int ttydisc_getc_uio(struct tty *, struct uio *);
+
+/* Error codes for ttydisc_rint(). */
+#define TRE_FRAMING 0x01
+#define TRE_PARITY 0x02
+#define TRE_OVERRUN 0x04
+#define TRE_BREAK 0x08
+
+static __inline size_t
+ttydisc_read_poll(struct tty *tp)
+{
+
+ tty_lock_assert(tp, MA_OWNED);
+
+ return ttyinq_bytescanonicalized(&tp->t_inq);
+}
+
+static __inline size_t
+ttydisc_write_poll(struct tty *tp)
+{
+
+ tty_lock_assert(tp, MA_OWNED);
+
+ return ttyoutq_bytesleft(&tp->t_outq);
+}
+
+static __inline size_t
+ttydisc_rint_poll(struct tty *tp)
+{
+
+ tty_lock_assert(tp, MA_OWNED);
+
+ return ttyinq_bytesleft(&tp->t_inq);
+}
+
+static __inline size_t
+ttydisc_getc_poll(struct tty *tp)
+{
+
+ tty_lock_assert(tp, MA_OWNED);
+
+ if (tp->t_flags & TF_STOPPED)
+ return (0);
+
+ return ttyoutq_bytesused(&tp->t_outq);
+}
+
+#endif /* !_SYS_TTYDISC_H_ */