c/c++ 打印调用栈

打印调用栈可以在程序出现死机的时候（如出现 SIGABRT、SIGSEGV等一些信号错误）是很有用的信息，有可能就不需要 core file 来协助排查问题了。通过 man backtrace 可以得到一个例子的源码：

#define SIZE 100
static void backTracePro(void) 
{ int j, nptrs; void *buffer[SIZE]; char **strings; nptrs = backtrace(buffer, SIZE);printf("****************************************\n");//这行我自己加的printf("backtrace() returned %d addresses\n", nptrs); /* The call backtrace_symbols_fd(buffer, nptrs, STDOUT_FILENO) would produce similar output to the following: */ strings = backtrace_symbols(buffer, nptrs); if (strings == NULL) { perror("backtrace_symbols"); exit(EXIT_FAILURE); } for (j = 0; j < nptrs; j++){printf("%s\n", strings[j]); }free(strings); 
}

然后可以把这个函数放在信号回调函数里，所以先需要设置一下信号处理函数，函数：int sigaction (int __sig, const struct sigaction *__restrict __act, struct sigaction *__restrict __oact)，

static bool initSignalCallBack() 
{struct sigaction sigact;memset(&sigact, 0, sizeof(sigact));sigact.sa_handler = signalHandler;sigemptyset(&(sigact.sa_mask));int ret = sigaction(SIGABRT, &sigact, NULL);if(0 == ret){ret |= sigaction(SIGSEGV, &sigact, NULL);}else{strerror(errno);return false;}if(ret){strerror(errno);}return ret == 0;
}

所以可以把 backTracePro() 放到信号回调函数 signalHandler() 里，看看执行结果: