What is sigaction used for?

What is sigaction used for?

sigaction() can be used to inquire about the current handling of signal sig. If act is not NULL, the action specified in the sigaction structure becomes the new action associated with sig. (Output) A pointer to a storage location where sigaction() can store a sigaction structure.

What does sigaction do in C?

The sigaction() function allows the calling process to examine and/or specify the action to be associated with a specific signal. The argument sig specifies the signal; acceptable values are defined in .

What is sigaction API?

In computing, sigaction is a function API defined by POSIX to give the programmer access to what should be a program’s behavior when receiving specific OS signals.

What is Unix sigaction?

The sigaction() system call is used to change the action taken by a process on receipt of a specific signal. (See signal(7) for an overview of signals.) signum specifies the signal and can be any valid signal except SIGKILL and SIGSTOP.

What is struct sigaction?

The sigaction structure specifies how to handle a signal. You’ll use this structure when you call sigaction() or SignalAction() The members include the following: void (*sa_handler) (int signo ); The address of a signal handler or action for queued signals.

Where is sigaction defined?

h>. The structure sigaction, used to describe an action to be taken, is defined in the .h> header to include at least the following members: Member Type. Member Name. Description.

Which sigaction flag is used to prevent a system call from being interrupted?

You can set sa_mask in your sigaction call to block certain signals while a particular signal handler runs. This way, the signal handler can run without being interrupted itself by signals.

What are the benefits of sigaction over signal in Linux?

The signal() function does not (necessarily) block other signals from arriving while the current handler is executing; sigaction() can block other signals until the current handler returns. The signal() function (usually) resets the signal action back to SIG_DFL (default) for almost all signals.

What are the benefits of sigaction over signal?

To avoid having problems as a result, always use sigaction to save and restore a handler if your program uses sigaction at all. Since sigaction is more general, it can properly save and reestablish any action, regardless of whether it was established originally with signal or sigaction .