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SIG_DFL, SIG_IGN

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Defined in header <csignal>
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#define SIG_DFL /*implementation defined*/
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#define SIG_IGN /*implementation defined*/
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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 std::signal() function.

Constant Explanation
SIG_DFL default signal handling
SIF_IGN signal is ignored

See also

C documentation for SIG_DFL, SIG_IGN