在代码中调用gdb

转载：http://blog.****.net/hanchaoman/article/details/5583457

在SIGSEGV的handler中调用gdb，

命令gdb [exec file] [pid]可以让gdb附加到这个进程上

#include <limits.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <stdlib.h>

//获取进程名
size_t get_executable_path( char* processdir,char* processname, size_t len)
{
        char* path_end;
        if(readlink("/proc/self/exe", processdir,len) <=)
                return -;
        path_end = strrchr(processdir,  '/');
        if(path_end == NULL)
                return -;
        ++path_end;
        strcpy(processname, path_end);
        *path_end = '\0';
        return (size_t)(path_end - processdir);
}

void dump(int signo)
{
        char path[PATH_MAX];
        char processname[];
    char cmd[];

        bzero(path, PATH_MAX);
        bzero(processname, );
    bzero(cmd, );

        get_executable_path( path, processname, sizeof(path));

    snprintf(cmd, sizeof(cmd), "gdb %s %d", processname, getpid());
    printf("%s\n", cmd);

    system(cmd);

    exit();
}

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

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

    test_function();
    return ;
}