opensolaris man page for tcdrain

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 5.11							    14 Aug 2002 						       tcdrain(3C)