tcdrain(3C) Standard C Library Functions tcdrain(3C)NAMEtcdrain - 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 ALSOtcflush(3C), attributes(5), standards(5), termio(7I)SunOS 5.10 14 Aug 2002 tcdrain(3C)
