Terminal I/O Functions

Terminal I/O interfaces deal with a general terminal interface for controlling asynchronous communications ports, as shown in the following table. For more information, see the termios(3C) and termio(7I) man pages.

Table 6-5 Terminal I/O Interfaces

The following example shows how the server dissociates from the controlling terminal of its invoker in the non-DEBUG mode of operation.

Example 6-4 Dissociating From the Controlling Terminal

   (void) close(0);
   (void) close(1);
   (void) close(2);
   (void) open("/", O_RDONLY);
   (void) dup2(0, 1);
   (void) dup2(0, 2);
   setsid();

This operation mode prevents the server from receiving signals from the process group of the controlling terminal. A server cannot send reports of errors to a terminal after the server has dissociated. The dissociated server must log errors with syslog(3C).