osf1 man page for tcsendbreak

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)