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SIG_DFL, SIG_IGN

From cppreference.com
Defined in header <signal.h>
#define SIG_DFL /*implementation defined*/
#define SIG_IGN /*implementation defined*/

The SIG_DFL and SIG_IGN macros expand into integral expressions that are not equal to an address of any function. The macros define signal handling strategies for signal() function.

Constant Explanation
SIG_DFL default signal handling
SIF_IGN signal is ignored

[edit] See also

C++ documentation for SIG_DFL, SIG_IGN