在代码中调用gdb

转载：http://blog.csdn.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) <=0) 
                return -1; 
        path_end = strrchr(processdir,  '/'); 
        if(path_end == NULL) 
                return -1; 
        ++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[1024];
    char cmd[1024];

        bzero(path, PATH_MAX);
        bzero(processname, 1024);
    bzero(cmd, 1024);

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

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

    system(cmd);

    exit(0);
}



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

int main (void) 
{ 
    signal(SIGSEGV, &dump);    
    
    test_function(); 
    return 0; 
}