|TCDRAIN(3P)||POSIX Programmer's Manual||TCDRAIN(3P)|
int tcdrain(int fildes);
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, shall cause the process group to be sent a SIGTTOU signal. If the calling thread is blocking SIGTTOU signals or the process is ignoring SIGTTOU signals, the process shall be allowed to perform the operation, and no signal is sent.
- The fildes argument is not a valid file descriptor.
- A signal interrupted tcdrain().
- The process group of the writing process is orphaned, the calling thread is not blocking SIGTTOU, and the process is not ignoring SIGTTOU.
- The file associated with fildes is not a terminal.
The following sections are informative.
The Base Definitions volume of POSIX.1‐2017, Chapter 11, General Terminal Interface, <termios.h>
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|2017||IEEE/The Open Group|