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+.\" Copyright (c) 2001-2003 The Open Group, All Rights Reserved 
+.TH "TCFLOW" P 2003 "IEEE/The Open Group" "POSIX Programmer's Manual"
+.\" tcflow 
+.SH NAME
+tcflow \- suspend or restart the transmission or reception of data
+.SH SYNOPSIS
+.LP
+\fB#include <termios.h>
+.br
+.sp
+int tcflow(int\fP \fIfildes\fP\fB, int\fP \fIaction\fP\fB);
+.br
+\fP
+.SH DESCRIPTION
+.LP
+The \fItcflow\fP() function shall suspend or restart transmission
+or reception of data on the object referred to by
+\fIfildes\fP, depending on the value of \fIaction\fP. The \fIfildes\fP
+argument is an open file descriptor associated with a
+terminal.
+.IP " *" 3
+If \fIaction\fP is TCOOFF, output shall be suspended.
+.LP
+.IP " *" 3
+If \fIaction\fP is TCOON, suspended output shall be restarted.
+.LP
+.IP " *" 3
+If \fIaction\fP is TCIOFF, the system shall transmit a STOP character,
+which is intended to cause the terminal device to stop
+transmitting data to the system.
+.LP
+.IP " *" 3
+If \fIaction\fP is TCION, the system shall transmit a START character,
+which is intended to cause the terminal device to start
+transmitting data to the system.
+.LP
+.LP
+The default on the opening of a terminal file is that neither its
+input nor its output are suspended.
+.LP
+Attempts to use \fItcflow\fP() from a process which is a member of
+a background process group on a \fIfildes\fP associated
+with its controlling terminal, shall cause the process group to be
+sent a SIGTTOU signal. If the calling process is blocking or
+ignoring SIGTTOU signals, the process shall be allowed to perform
+the operation, and no signal is sent.
+.SH RETURN VALUE
+.LP
+Upon successful completion, 0 shall be returned. Otherwise, -1 shall
+be returned and \fIerrno\fP set to indicate the error.
+.SH ERRORS
+.LP
+The \fItcflow\fP() function shall fail if:
+.TP 7
+.B EBADF
+The \fIfildes\fP argument is not a valid file descriptor.
+.TP 7
+.B EINVAL
+The \fIaction\fP argument is not a supported value.
+.TP 7
+.B ENOTTY
+The file associated with \fIfildes\fP is not a terminal.
+.sp
+.LP
+The \fItcflow\fP() function may fail if:
+.TP 7
+.B EIO
+The process group of the writing process is orphaned, and the writing
+process is not ignoring or blocking SIGTTOU.
+.sp
+.LP
+\fIThe following sections are informative.\fP
+.SH EXAMPLES
+.LP
+None.
+.SH APPLICATION USAGE
+.LP
+None.
+.SH RATIONALE
+.LP
+None.
+.SH FUTURE DIRECTIONS
+.LP
+None.
+.SH SEE ALSO
+.LP
+\fItcsendbreak\fP() , the Base Definitions volume of IEEE\ Std\ 1003.1-2001,
+Chapter 11, General Terminal Interface, \fI<termios.h>\fP, \fI<unistd.h>\fP
+.SH COPYRIGHT
+Portions of this text are reprinted and reproduced in electronic form
+from IEEE Std 1003.1, 2003 Edition, Standard for Information Technology
+-- Portable Operating System Interface (POSIX), The Open Group Base
+Specifications Issue 6, Copyright (C) 2001-2003 by the Institute of
+Electrical and Electronics Engineers, Inc and The Open Group. In the
+event of any discrepancy between this version and the original IEEE and
+The Open Group Standard, the original IEEE and The Open Group Standard
+is the referee document. The original Standard can be obtained online at
+http://www.opengroup.org/unix/online.html .