tcflow(3c) [sunos man page]

tcflow(3C)						   Standard C Library Functions 						tcflow(3C)

NAME

       tcflow - suspend or restart the transmission or reception of data

SYNOPSIS

       #include <termios.h>

       int tcflow(int fildes, int action);

DESCRIPTION

       The tcflow() function suspends transmission or reception of data on the object referred to by fildes, depending on the value of action. The
       fildes argument is an open file descriptor associated with a terminal.

	 o  If action is TCOOFF, output is suspended.

	 o  If action is TCOON, suspended output is restarted.

	 o  If action is TCIOFF, the system transmits a STOP character, which is intended to cause the terminal device to stop	transmitting  data
	    to the system.

	 o  If	action is TCION, the system transmits a START character, which is intended to cause the terminal device to start transmitting data
	    to the system.

       The default on the opening of a terminal file is that neither its input nor its output are suspended.

       Attempts to use tcflow() from a process which is a member of a background process group on a fildes associated with its controlling  termi-
       nal,  will cause the process group to be sent a SIGTTOU signal. If the calling process is blocking or ignoring SIGTTOU signals, the process
       is allowed to perform the operation, and no signal is sent.

RETURN VALUES

       Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The tcflow() function will fail if:

       EBADF	       The fildes argument is not a valid file descriptor.

       EINVAL	       The action argument is not a supported value.

       ENOTTY	       The file associated with fildes is not a terminal.

       The tcflow() function may fail if:

       EIO	       The process group of the writing process is orphaned, and the writing process is not ignoring or blocking SIGTTOU.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-------------------------------+
       |      ATTRIBUTE TYPE	     |	     ATTRIBUTE VALUE	     |
       +-----------------------------+-------------------------------+
       |Interface Stability	     |Standard			     |
       +-----------------------------+-------------------------------+
       |MT-Level		     |MT-Safe, and Async-Signal-Safe |
       +-----------------------------+-------------------------------+

SEE ALSO

       tcsendbreak(3C), attributes(5), standards(5), termio(7I)

SunOS 5.10							    14 Aug 2002 							tcflow(3C)

TCSENDBREAK(3)						   BSD Library Functions Manual 					    TCSENDBREAK(3)

NAME

     tcdrain, tcflow, tcflush, tcsendbreak -- line control functions

LIBRARY

     Standard C Library (libc, -lc)

SYNOPSIS

     #include <termios.h>

     int
     tcdrain(int fildes);

     int
     tcflow(int fildes, int action);

     int
     tcflush(int fildes, int action);

     int
     tcsendbreak(int fildes, int duration);

DESCRIPTION

     The tcdrain() function waits until all output written to the terminal referenced by fildes has been transmitted to the terminal.

     The tcflow() function suspends transmission of data to, or the reception of data from, the terminal referenced by fildes, depending on the
     value of action.  The value of action must be one of the following:

     TCOOFF  Suspend output.

     TCOON   Restart suspended output.

     TCIOFF  Transmit a STOP character, which is intended to cause the terminal to stop transmitting data to the system.  (See the description of
	     IXOFF in the 'Input Modes' section of termios(4)).

     TCION   Transmit a START character, which is intended to cause the terminal to start transmitting data to the system.  (See the description
	     of IXOFF in the 'Input Modes' section of termios(4)).

     The tcflush() function discards any data written to the terminal referenced by fildes which has not been transmitted to the terminal, or any
     data received from the terminal but not yet read, depending on the value of action.  The value of action must be one of the following:

     TCIFLUSH	Flush data received but not read.

     TCOFLUSH	Flush data written but not transmitted.

     TCIOFLUSH	Flush both data received but not read and data written but not transmitted.

     The tcsendbreak() function transmits a continuous stream of zero-valued bits for four-tenths of a second to the terminal referenced by
     fildes.  The duration parameter is ignored in this implementation.

RETURN VALUES

     Upon successful completion, all of these functions return a value of zero.

ERRORS

     If any error occurs, a value of -1 is returned and the global variable errno is set to indicate the error, as follows:

     [EBADF]		The fildes argument is not a valid file descriptor.

     [EINTR]		A signal interrupted the tcdrain() function.

     [EINVAL]		The action argument is not a proper value.

     [ENOTTY]		The file associated with fildes is not a terminal.

SEE ALSO

     tcsetattr(3), termios(4)

STANDARDS

     The tcsendbreak(), tcdrain(), tcflush() and tcflow() functions are expected to be compliant with the IEEE Std 1003.1-1988 (``POSIX.1'') spec-
     ification.

BSD
								   June 4, 1993 							       BSD