2fe8fb192f
There is important information about booting non-ack images in docs/UPDATING. ack/aout-format images can't be built any more, and booting clang/ELF-format ones is a little different. Updating to the new boot monitor is recommended. Changes in this commit: . drop boot monitor -> allowing dropping ack support . facility to copy ELF boot files to /boot so that old boot monitor can still boot fairly easily, see UPDATING . no more ack-format libraries -> single-case libraries . some cleanup of OBJECT_FMT, COMPILER_TYPE, etc cases . drop several ack toolchain commands, but not all support commands (e.g. aal is gone but acksize is not yet). . a few libc files moved to netbsd libc dir . new /bin/date as minix date used code in libc/ . test compile fix . harmonize includes . /usr/lib is no longer special: without ack, /usr/lib plays no kind of special bootstrapping role any more and bootstrapping is done exclusively through packages, so releases depend even less on the state of the machine making them now. . rename nbsd_lib* to lib* . reduce mtree
155 lines
4.3 KiB
Groff
155 lines
4.3 KiB
Groff
.\" $NetBSD: tcsendbreak.3,v 1.9 2003/08/07 16:44:13 agc Exp $
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.\"
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.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)tcsendbreak.3 8.1 (Berkeley) 6/4/93
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.\"
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.Dd June 4, 1993
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.Dt TCSENDBREAK 3
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.Os
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.Sh NAME
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.Nm tcsendbreak ,
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.Nm tcdrain ,
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.Nm tcflush ,
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.Nm tcflow
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.Nd line control functions
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In termios.h
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.Ft int
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.Fn tcdrain "int fd"
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.Ft int
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.Fn tcflow "int fd" "int action"
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.Ft int
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.Fn tcflush "int fd" "int action"
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.Ft int
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.Fn tcsendbreak "int fd" "int len"
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.Sh DESCRIPTION
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The
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.Nm tcdrain
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function waits until all output written to the terminal referenced by
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.Fa fd
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has been transmitted to the terminal.
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.Pp
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The
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.Nm tcflow
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function suspends transmission of data to or the reception of data from
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the terminal referenced by
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.Fa fd
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depending on the value of
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.Fa action .
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The value of
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.Fa action
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must be one of the following:
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.Bl -tag -width "TCIOFF"
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.It Fa TCOOFF
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Suspend output.
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.It Fa TCOON
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Restart suspended output.
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.It Fa TCIOFF
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Transmit a STOP character, which is intended to cause the terminal to stop
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transmitting data to the system.
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(See the description of IXOFF in the
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.Ql Input Modes
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section of
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.Xr termios 4 ) .
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.It Fa TCION
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Transmit a START character, which is intended to cause the terminal to start
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transmitting data to the system.
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(See the description of IXOFF in the
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.Ql Input Modes
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section of
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.Xr termios 4 ) .
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.El
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.Pp
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The
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.Nm tcflush
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function discards any data written to the terminal referenced by
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.Fa fd
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which has not been transmitted to the terminal, or any data received
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from the terminal but not yet read, depending on the value of
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.Fa action .
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The value of
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.Fa action
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must be one of the following:
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.Bl -tag -width "TCIOFLUSH"
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.It Fa TCIFLUSH
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Flush data received but not read.
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.It Fa TCOFLUSH
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Flush data written but not transmitted.
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.It Fa TCIOFLUSH
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Flush both data received but not read and data written but not transmitted.
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.El
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.Pp
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The
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.Nm tcsendbreak
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function transmits a continuous stream of zero-valued bits for four-tenths
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of a second to the terminal referenced by
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.Fa fd .
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The
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.Fa len
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parameter is ignored in this implementation.
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.Sh RETURN VALUES
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Upon successful completion, all of these functions return a value of zero.
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.Sh ERRORS
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If any error occurs, a value of -1 is returned and the global variable
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.Va errno
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is set to indicate the error, as follows:
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.Bl -tag -width Er
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.It Bq Er EBADF
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The
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.Fa fd
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argument is not a valid file descriptor.
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.It Bq Er EINVAL
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The
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.Fa action
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argument is not a proper value.
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.It Bq Er ENOTTY
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The file associated with
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.Fa fd
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is not a terminal.
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.It Bq Er EINTR
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A signal interrupted the
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.Nm tcdrain
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function.
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.El
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.Sh SEE ALSO
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.Xr tcsetattr 3 ,
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.Xr termios 4
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.Sh STANDARDS
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The
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.Nm tcsendbreak ,
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.Nm tcdrain ,
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.Nm tcflush
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and
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.Nm tcflow
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functions are expected to be compliant with the
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.St -p1003.1-88
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specification.
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