怪哉，服務(wù)程序悄無(wú)聲息的退出

fly6

程序啟動(dòng)時(shí)就下注冊(cè)了如下信號(hào)，并在信號(hào)自理程序中打印了日志。
if((sigaction(SIGILL, &struAct, NULL) != 0) ||
           (sigaction(SIGSEGV, &struAct, NULL) != 0) ||
           (sigaction(SIGBUS, &struAct, NULL) != 0))
        {
                cutil_log_error("install sigaction catch error:%s\n", cutil_get_error(-1));
                return -1;
        }

程序主循環(huán)，這是一個(gè)死循環(huán)
while(1)
{
  do_some_thing();
}

按理說(shuō)程序要退出，除非異常退出，奇怪的是并沒(méi)有輸出異常信息。（程序不會(huì)接收到SIGKILL,SIGQUIT）
請(qǐng)問(wèn)還有什么會(huì)令程序退出不打印異常信息

cdtits

正常退出，貌似不會(huì)打印吧

fly6

這是個(gè)死循環(huán)，不會(huì)正常退出的

r2007

猜一下，是不是tty沒(méi)關(guān)閉？
其實(shí)守護(hù)進(jìn)程就那么幾個(gè)要點(diǎn)，弄個(gè)check list挨個(gè)查一遍就找到原因了。

Moon_Bird

1. if((sigaction(SIGILL, &struAct, NULL) != 0) ||
   
2.            (sigaction(SIGSEGV, &struAct, NULL) != 0) ||
   
3.            (sigaction(SIGBUS, &struAct, NULL) != 0))
   
4.         {
   
5.                 cutil_log_error("install sigaction catch error:%s\n", cutil_get_error(-1));
   
6.                 return -1;
   
7.         }
   
8. 
   

復(fù)制代碼

你這只是信號(hào)注冊(cè)部分吧，相應(yīng)的信號(hào)處理函數(shù)是什么樣的...............

fly6

回復(fù) 4# r2007
這個(gè)在程序一開(kāi)始就做了demon處理，包括關(guān)閉tty,關(guān)閉會(huì)話，還有fork

     

fly6

回復(fù) 5# Moon_Bird
就是打印錯(cuò)誤信息及堆棧信息


   

r2007

FYI
The common method for a process to become a daemon involves:

    Dissociating from the controlling tty
    Becoming a session leader
    Becoming a process group leader
    Executing as a background task by forking and exiting (once or twice). This is required sometimes for the process to become a session leader. It also allows the parent process to continue its normal execution.
    Setting the root directory ("/") as the current working directory so that the process does not keep any directory in use that may be on a mounted file system (allowing it to be unmounted).
    Changing the umask to 0 to allow open(), creat(), et al. operating system calls to provide their own permission masks and not to depend on the umask of the caller
    Closing all inherited files at the time of execution that are left open by the parent process, including file descriptors 0, 1 and 2 (stdin, stdout, stderr). Required files will be opened later.
    Using a logfile, the console, or /dev/null as stdin, stdout, and stderr

流氓無(wú)產(chǎn)者

信號(hào)不一定能抓到，有些程序都抓SIGSEGV了，還是沒(méi)提示，直接掛了
多半是exception退出了

fly6

嗯，樓上可以再詳細(xì)點(diǎn)具體點(diǎn)不