tcdrain(3C) Standard C Library Functions tcdrain(3C)
NAME
tcdrain - wait for transmission of output
SYNOPSIS
#include <termios.h>
int tcdrain(int fildes);
DESCRIPTION
The tcdrain() function waits 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, 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 tcdrain() function will fail if:
EBADF The fildes argument is not a valid file descriptor.
EINTR A signal interrupted tcdrain().
ENOTTY The file associated with fildes is not a terminal.
The tcdrain() 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 ALSO
tcflush(3C), attributes(5), standards(5), termio(7I)
SunOS 5.10 14 Aug 2002 tcdrain(3C)
