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OpenSolaris 2009.06 - man page for tcdrain (opensolaris section 3c)

tcdrain(3C)						   Standard C Library Functions 					       tcdrain(3C)

tcdrain - wait for transmission of output
#include <termios.h> int tcdrain(int fildes);
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.
Upon successful completion, 0 is returned. Otherwise, -1 is returned and errno is set to indicate the error.
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.
See attributes(5) for descriptions of the following attributes: +-----------------------------+-------------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-------------------------------+ |Interface Stability |Standard | +-----------------------------+-------------------------------+ |MT-Level |MT-Safe, and Async-Signal-Safe | +-----------------------------+-------------------------------+
tcflush(3C), attributes(5), standards(5), termio(7I) SunOS 5.11 14 Aug 2002 tcdrain(3C)

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