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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../../cpp/../c/program/SIG_strategies.html below:

SIG_DFL, SIG_IGN - cppreference.com

#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.

#include <signal.h>
#include <stdio.h>
 
int main(void)
{
    /* using the default signal handler */
    raise(SIGTERM);
    printf("Exit main()\n");   /* never reached */
}

Output:

• C17 standard (ISO/IEC 9899:2018):

• 7.14/3 Signal handling <signal.h> (p: 193)

• C11 standard (ISO/IEC 9899:2011):

• 7.14/3 Signal handling <signal.h> (p: 265)

• C99 standard (ISO/IEC 9899:1999):

• 7.14/3 Signal handling <signal.h> (p: 246)

• C89/C90 standard (ISO/IEC 9899:1990):

• 4.7 SIGNAL HANDLING <signal.h>

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