怪哉，服务程序悄无声息的退出

fly6

程序启动时就下注册了如下信号，并在信号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;
        }

程序主循环，这是一个死循环
while(1)
{
  do_some_thing();
}

按理说程序要退出，除非异常退出，奇怪的是并没有输出异常信息。（程序不会接收到SIGKILL,SIGQUIT）
请问还有什么会令程序退出不打印异常信息

cdtits

正常退出，貌似不会打印吧

fly6

这是个死循环，不会正常退出的

r2007

猜一下，是不是tty没关闭？
其实守护进程就那么几个要点，弄个check list挨个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. 
   

复制代码

你这只是信号注册部分吧，相应的信号处理函数是什么样的...............

fly6

回复 4# r2007
这个在程序一开始就做了demon处理，包括关闭tty,关闭会话，还有fork

     

fly6

回复 5# Moon_Bird
就是打印错误信息及堆栈信息


   

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

流氓无产者

信号不一定能抓到，有些程序都抓SIGSEGV了，还是没提示，直接挂了
多半是exception退出了

fly6

嗯，楼上可以再详细点具体点不