SIGILL Macro

Signals illegal instruction.

Include

<signal.h>

Prototype

#define SIGILL

Remarks

SIGILL is used as an argument for raise and/or signal. When used, the default behavior is to print an invalid executable code message and terminate the calling program. This may be overridden by a user function that defines the signal handler actions. See signal for an example of a user-defined function.

Example

#include <signal.h> /* for raise, SIGILL */
#include <stdio.h> /* for printf */

int main(void)
{
  raise(SIGILL);
  printf("Program never reaches here");
}

Example Output

ILL

where ILL stands for “illegal instruction.”