在终止进程之前保存gmon.out [英] Saving gmon.out before killing a process

问题描述

我想使用gprof来分析守护程序.我的守护程序使用第3方库，通过它注册一些回调，然后调用main函数，该函数永不返回.我需要调用kill(SIGTERM或SIGKILL)来终止守护程序.不幸的是，gprof的手册页显示以下内容:

I would like to use gprof to profile a daemon. My daemon uses a 3rd party library, with which it registers some callbacks, then calls a main function, that never returns. I need to call kill (either SIGTERM or SIGKILL) to terminate the daemon. Unfortunately, gprof's manual page says the following:

被分析的程序必须调用"exit"(2)或正常返回 分析信息，将其保存在gmon.out文件中.

The profiled program must call "exit"(2) or return normally for the profiling information to be saved in the gmon.out file.

是否可以为被SIGTERM或SIGKILL杀死的进程保存性能分析信息?

Is there is way to save profiling information for processes which are killed with SIGTERM or SIGKILL ?

推荐答案

首先，我要感谢@wallyk为我提供了很好的初始指针.我如下解决了我的问题.显然，libc的gprof退出处理程序称为_mcleanup.因此，我为SIGUSR1注册了一个信号处理程序(未由第三方库使用)，并分别命名为_mcleanup和_exit.完美的作品！代码如下:

First, I would like to thank @wallyk for giving me good initial pointers. I solved my issue as follows. Apparently, libc's gprof exit handler is called _mcleanup. So, I registered a signal handler for SIGUSR1 (unused by the 3rd party library) and called _mcleanup and _exit. Works perfectly! The code looks as follows:

#include <dlfcn.h>
#include <stdio.h>
#include <unistd.h>

void sigUsr1Handler(int sig)
{
    fprintf(stderr, "Exiting on SIGUSR1\n");
    void (*_mcleanup)(void);
    _mcleanup = (void (*)(void))dlsym(RTLD_DEFAULT, "_mcleanup");
    if (_mcleanup == NULL)
         fprintf(stderr, "Unable to find gprof exit hook\n");
    else _mcleanup();
    _exit(0);
}

int main(int argc, char* argv[])
{
    signal(SIGUSR1, sigUsr1Handler);
    neverReturningLibraryFunction();
}

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