tcsendbreak#
Synopsis#
#include <termios.h>
int tcsendbreak(int fildes, int duration);
Status#
Partially implemented
Conformance#
IEEE Std 1003.1-2017
Description#
tcsendbreak()
- send a break for a specific duration
If the terminal is using asynchronous serial data transmission, tcsendbreak()
shall cause transmission of a continuous
stream of zero-valued bits for a specific duration. If duration is 0
, it shall 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 shall send zero-valued
bits for an implementation-defined period of time.
The fildes argument is an open file descriptor associated with a terminal.
If the terminal is not using asynchronous serial data transmission, it is implementation-defined whether tcsendbreak()
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 shall cause the process group to be sent a SIGTTOU
signal. If the calling thread is
blocking SIGTTOU
signals or the process is ignoring SIGTTOU
signals, the process shall be allowed to perform the
operation, and no signal is sent.
Return value#
Upon successful completion, 0
shall be returned. Otherwise, -1
shall be returned and errno
set to indicate the
error.
Errors#
The tcsendbreak()
function shall fail if:
EBADF
- The fildes argument is not a valid file descriptor.EIO
- The process group of the writing process is orphaned, the calling thread is not blockingSIGTTOU
, and the process is not ignoringSIGTTOU
.ENOTTY
- The file associated with fildes is not a terminal.
Tests#
Untested
Known bugs#
None