function std::signal

From Cppwiki

The std::signal function sets the characterists for the handling of a given signal value.

std::signal has the following prototype:

#include <csignal>

namespace std {

  ptypedef void (*sig_func_ptr)(int);

  sig_func_ptr signal(int sig, sig_func_ptr new_func);

}

sig

The signal number to modify

new_func

The function to use when the signal is invoked

std::signal returns the previous handler function for the signal. This value should be saved if the program will quit handling the signal at some point, or if signal handler chaining is desired.

Three special sig_func_ptr values are also defined:

SIG_DFL

Use the system's default handler for this signal.

SIG_IGN

Ignore this signal.

SIG_ERR

Not an actual handler, indicates there was a problem with the call to std::signal.

See also: std::raise, <csignal> header