使用backtrace打印程序crash堆栈

使用backtrace打印程序crash堆栈

利用backtrace可以在程序crash退出之前，打印出crash时的堆栈信息，有助于我们分析crash问题。下面，教大家如何在linux下利用backtrace打印crash堆栈信息。

1. 引入头文件

# include 

2. 初始化backtrace

struct sigaction newAct;
newAct.sa_handler = NaviBackTrace;
sigemptyset( &newAct.sa_mask );

sigaction(SIGABRT, &newAct, NULL);
sigaction(SIGSEGV, &newAct, NULL);
sigaction(SIGBUS, &newAct, NULL);
sigaction(SIGFPE, &newAct, NULL);
sigaction(SIGILL, &newAct, NULL);
sigaction(SIGTRAP, &newAct, NULL);

其中NaviVackTrace为程序发生crash，退出之前的回调函数，在此函数中可以做一些事情，例如打印crash堆栈，通知其它程序该程序crash等。

3. NaviBackTrace函数

static void NaviBackTrace(int signalNum)
{
    printf("NaviBackTrace signalNum[%d]", signalNum);
    usleep(1000 * 1000);

    if (signalNum == SIGABRT)
    {
        printf("Start print stack information(SIGABRT).");
    }
    else if (signalNum == SIGSEGV)
    {
        printf("Start print stack information(SIGSEGV).");
    }
    else if (signalNum == SIGBUS)
    {
        printf("Start print stack information(SIGBUS).");
    }
    else if (signalNum == SIGFPE)
    {
        printf("Start print stack information(SIGFPE).");
    }
    else if (signalNum == SIGILL)
    {
        printf("Start print stack information(SIGILL).");
    }
    else if (signalNum == SIGTRAP)
    {
        printf("Start print stack information(SIGTRAP).");
    }

    void * array[100];
    int nSize = backtrace(array, 100);
    char ** symbols = backtrace_symbols(array, nSize);

    printf("process id(%d), thread id(%u)", getpid(), (unsigned int)pthread_self());
    for (int i = 1; i < nSize; i++)
    {
        printf("%s", symbols[i]);
    }
    printf("End print stack information.");

    free(symbols);

    signal(SIGABRT, SIG_DFL);
    signal(SIGSEGV, SIG_DFL);
    signal(SIGBUS, SIG_DFL);
    signal(SIGFPE, SIG_DFL);
    signal(SIGILL, SIG_DFL);
    signal(SIGTRAP, SIG_DFL);
}