tcdrain#
Synopsis#
#include <termios.h>
int tcdrain(int fildes);
Status#
Partially implemented
Conformance#
IEEE Std 1003.1-2017
Description#
The tcdrain()
function shall block until all output written to the object referred to by fildes is transmitted. The
fildes argument is an open file descriptor associated with a terminal.
Any attempts to use tcdrain()
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 tcdrain()
function shall fail if:
EBADF
- The fildes argument is not a valid file descriptor.EINTR
- A signal interruptedtcdrain()
.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