Chapter 22. Signals: Advanced Features

This chapter completes the discussion of signals that we began in Chapter 20, covering a number of more advanced topics, including the following:

• core dump files;

• special cases regarding signal delivery, disposition, and handling;

• synchronous and asynchronous generation of signals;

• when and in what order signals are delivered;

• interruption of system calls by signal handlers, and how to automatically restart interrupted system calls;

• realtime signals;

• the use of sigsuspend() to set the process signal mask and wait for a signal to arrive;

• the use of sigwaitinfo() (and sigtimedwait()) to synchronously wait for a signal to arrive;

• the use of signalfd() to receive a signal via file descriptor; and

• the older BSD and System V signal APIs.