TCSENDBREAK(3C)TCSENDBREAK(3C)NAMEtcsendbreak - send a ``break'' for a specific duration
SYNOPSIS
#include <termios.h>
int tcsendbreak(int fildes, int duration);
DESCRIPTION
The fildes argument is an open file descriptor associated with a termi‐
nal.
If the terminal is using asynchronous serial data transmission, tcsend‐
break() will cause transmission of a continuous stream of zero-valued
bits for a specific duration. If duration is 0, it will cause trans‐
mission of zero-valued bits for at least 0.25 seconds, and not more
than 0.5 seconds. If duration is not 0, it behaves in a way similar to
tcdrain(3C).
If the terminal is not using asynchronous serial data transmission, it
sends data to generate a break condition or returns without taking any
action.
Attempts to use tcsendbreak() from a process which is a member of a
background process group on a fildes associated with its controlling
terminal 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 tcsendbreak() function will fail if:
EBADF
The fildes argument is not a valid file descriptor.
ENOTTY
The file associated with fildes is not a terminal.
The tcsendbreak() 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 ALSOtcdrain(3C), attributes(5), standards(5), termio(7I)
Aug 14, 2002 TCSENDBREAK(3C)
