调试程序

*****************************************1***************************************
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>

void dump(int signo)
{
        char buf[1024];
        char cmd[1024];
        FILE *fh;

        snprintf(buf, sizeof(buf), "/proc/%d/cmdline", getpid());
        if(!(fh = fopen(buf, "r")))
                exit(0);
        if(!fgets(buf, sizeof(buf), fh))
                exit(0);
        fclose(fh);
        if(buf[strlen(buf) - 1] == '\n')
                buf[strlen(buf) - 1] = '\0';
        snprintf(cmd, sizeof(cmd), "gdb %s %d", buf, getpid());
        system(cmd);

        exit(0);
}

        void
dummy_function (void)
{
        unsigned char *ptr = 0x00;
        *ptr = 0x00;
}

        int
main (void)
{
        signal(SIGSEGV, &dump);
        dummy_function ();

        return 0;
}
~   


*****************************************2***********************


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

/* A dummy function to make the backtrace more interesting. */
        void
dummy_function (void)
{
        unsigned char *ptr = 0x00;
        *ptr = 0x00;
}

void dump(int signo)
{
        void *array[10];
        size_t size;
        char **strings;
        size_t i;

        size = backtrace (array, 10);
        strings = backtrace_symbols (array, size);

        printf ("Obtained %zd stack frames.\n", size);

        for (i = 0; i < size; i++)
                printf ("%s\n", strings[i]);

        free (strings);

        exit(0);
}

        int
main (void)
{
        signal(SIGSEGV, &dump);
        dummy_function ();

        return 0;
}