tcflow(3) [osf1 man page]

tcflow(3)						     Library Functions Manual							 tcflow(3)

NAME

       tcflow -  Performs flow control functions

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <termios.h>

       int tcflow(
	       int filedes,
	       int action);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       tcflow():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies  an open file descriptor.  Specifies one of the following: Suspend output.  Restart suspended output.	Transmit a STOP character,
       which is intended to cause the terminal device to stop transmitting data to the system.	Transmit a START character, which is  intended	to
       cause the terminal device to start transmitting data to the system.

DESCRIPTION

       The tcflow() function suspends transmission or reception of data on the object referred to by the filedes parameter, depending on the value
       of the action parameter.

       A process group is sent a SIGTTOU signal if the tcflow() function is called from one of its member processes.  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, a value of 0 (zero) is returned. Otherwise, a value of -1 is returned and errno is set to indicate the error.

ERRORS

       The tcflow() function sets errno to the specified values for the following conditions:

       The  filedes  parameter does not specify a valid file descriptor.  The action parameter is not a supported value.  The file associated with
       the filedes parameter is not a terminal.

RELATED INFORMATION

       Functions: tcdrain(3), tcflush(3), tcsendbreak(3)

       Files: termios(4)

       Standards: standards(5) delim off

																	 tcflow(3)

tcsendbreak(3)						     Library Functions Manual						    tcsendbreak(3)

NAME

       tcsendbreak -  Sends a break on an asynchronous serial data line

LIBRARY

       Standard C Library (libc.so, libc.a)

SYNOPSIS

       #include <termios.h>

       int tcsendbreak(
	       int filedes,
	       int duration);

STANDARDS

       Interfaces documented on this reference page conform to industry standards as follows:

       tcsendbreak():  XPG4, XPG4-UNIX

       Refer to the standards(5) reference page for more information about industry standards and associated tags.

PARAMETERS

       Specifies  an  open file descriptor.  Specifies the number of milliseconds that zero-valued bits are transmitted. If the value of the dura-
       tion parameter is 0 (zero), transmission of zero-valued bits is for 250 milliseconds.  If duration is not 0,  transmission  of  zero-valued
       bits is for duration milliseconds.

DESCRIPTION

       If  the	terminal  is using asynchronous serial data transmission, the tcsendbreak() function causes transmission of a continuous stream of
       zero-valued bits for a specific duration.  If the terminal is not using asynchronous serial data transmission, the  tcsendbreak()  function
       returns without taking any action.

       A  process group is sent a SIGTTOU signal if the tcsendbreak() function is called from one of its member processes.  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, a value of 0 (zero) is returned. Otherwise, -1 is returned and errno is set to indicate the error.

ERRORS

       The tcsendbreak() function sets errno to the specified values for the following conditions:

       The filedes parameter does not specify a valid open file descriptor.  The file associated with the filedes parameter is not a terminal.

RELATED INFORMATION

       Functions: tcdrain(3), tcflow(3), tcflush(3)

       Files: termios(4)

       Standards: standards(5) delim off

																    tcsendbreak(3)