Re: sigtrap and TF

[Rene Herman <rene.herman@xxxxxxxxxxxx>]

On 05-12-07 15:23, ninjaboy wrote:

> why if i put TF in my prog and install an handler to SIGTRAP the
> handler is not caught?

Works for me.

Rene.

/* gcc -W -Wall -o sigtrap sigtrap.c */

#include <stdlib.h>
#include <stdio.h>
#include <signal.h>

volatile sig_atomic_t trap;

void sigtrap(int signum __attribute__((unused)))
{
	trap = 1;
}

int main(void)
{
	struct sigaction sa;

	sa.sa_handler = sigtrap;
	sigemptyset(&sa.sa_mask);
	sa.sa_flags = 0;

	if (sigaction(SIGTRAP, &sa, NULL) < 0) {
		perror("could not install handler");
		return EXIT_FAILURE;
	}

	asm("int3");

	printf("trap = %d\n", (int)trap);
	return EXIT_SUCCESS;
}