tcsendbreak - send a ``break'' for a specific duration
int tcsendbreak(int fildes, int duration);
The fildes argument is an open file descriptor associated
with a terminal.
If the terminal is using asynchronous serial data transmis-
sion, tcsendbreak() will cause transmission of a continuous
stream of zero-valued bits for a specific duration. If
duration is 0, it will cause transmission 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
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.
Upon successful completion, 0 is returned. Otherwise, -1 is
returned and errno is set to indicate the error.
The tcsendbreak() function will fail if:
EBADF The fildes argument is not a valid file descriptor.
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
See attributes(5) for descriptions of the following attri-
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| MT-Level | MT-Safe, and Async-Signal-Safe|
tcdrain(3C), attributes(5), termio(7I)
Man(1) output converted with