ttymsg(struct iovec *iov, int iovlen, const char *tty, int tmout);
DESCRIPTION
The ttymsg() function is used by programs such as talkd(8), syslogd(8), wall(1), etc., to display the contents of a uio structure on a terminal. ttymsg() forks and finishes in the child if the write would block after waiting up to tmout seconds.
RETURN VALUES
ttymsg() returns a pointer to an error string on unexpected error; the string is not newline-terminated. Various "normal" errors are ignored (exclusive-use, lack of permission, etc.).