sp.c - The Linux Stack Pointer

/**
 * [sp.c]
 * A program that prints its stack pointer (on Linux).
 *
 *
 * compile with:
 * gcc -o sp sp.c
 */

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

unsigned long get_sp(void)
{
    __asm__("movl   %esp, %eax");
}

int main(void)
{
    printf("0x%x\n", get_sp());

    return 0;
}