进程监控

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问题描述：一个父进程监控多个子进程，子进程执行函数f，若子进程挂掉，则重新fork一个子进程。

 #ifndef MS_MONITOR_H_                                                                          #define MS_MONITOR_H_  3 #include <iostream>  4 #include <string>  5 #include <vector>  6 #include <sys/types.h>  7 #include <sys/wait.h>  8 #include <sys/stat.h>  9  10 typedef int (*superMonitorHndl)(int argc, char **argv); 11 static int run_child = 0; 12  13 class SuperMonitor{ 14     public: 15         SuperMonitor(); 16         SuperMonitor(int childnum); 17         ~SuperMonitor(); 18         void Initial(superMonitorHndl f); 19  20     private: 21        int startChild(std::vector<pid_t>& pidArr,superMonitorHndl f); 22        bool isAbnormalExit(int pid, int status); 23         void Run (superMonitorHndl f); 24  25        int child_num; 26 }; 27  28 #endif

#include <iostream>                                                                                                                             1 #include <string>  2 #include <vector>  3 #include <sys/types.h>  4 #include <unistd.h>  5 #include <fcntl.h>  6 #include <stdlib.h>  7 #include <sys/wait.h>  8 #include <sys/stat.h>  9 #include "super_monitor.h" 10 using namespace std; 11  12 SuperMonitor::SuperMonitor(){ 13 } 14 SuperMonitor::SuperMonitor(int childnum){ 15     child_num = childnum; 16 } 17 SuperMonitor::~SuperMonitor(){ 18 } 19  20 void SuperMonitor::Run(superMonitorHndl f){ 21     int rc; 22     rc = f (0, (char **) 0); 23 } 24  25 bool SuperMonitor::isAbnormalExit(int pid, int status){ 26     bool bRestart = true; 27     if(WIFEXITED(status)) { 28         printf("child normal termination, exit pid = %d, status = %d\n", pid, WEXITSTATUS(status)); 29         bRestart = false; 30     }else if(WIFSIGNALED(status)){ 31         printf("abnormal termination, pid = %d, signal number = %d\n", pid, WTERMSIG(status)); 32         if(WTERMSIG(status) == SIGKILL) { 33             bRestart = false; 34             printf("has been killed by user ??, exit pid = %d, status = %d\n", pid, WEXITSTATUS(status)); 35         } 36     }else if(WIFSTOPPED(status)) 37         printf("child stopped, pid = %d, signal number = %d\n", pid, WSTOPSIG(status)); 38     else 39         printf("child other reason quit, pid = %d, signal number = %d\n", pid, WSTOPSIG(status)); 40     return bRestart; 41 } 42  43 int SuperMonitor::startChild(std::vector<pid_t> &pidArr,superMonitorHndl f){ 44     int pid = fork();        if(pid == 0) { 37         //TODO 36         Run(f); 35     } 34     else if(pid > 0) { 33         pidArr.push_back(pid); 32         ++run_child; 31     } 30     return pid; 29 } 28  27 void SuperMonitor::Initial(superMonitorHndl f){ 26     pid_t father_pid; 25     std::vector<pid_t> pidArr; 24     while(run_child < child_num){ 23         father_pid = startChild(pidArr,f); 22         if(father_pid == 0||father_pid ==-1) 21             break; 20     } 19     if(father_pid<0) 18         printf("error in fork!"); 17     else if(father_pid==0) 16         printf("I am the child process, my process ID is %d, father is %d\n",getpid(),getppid()); 15     else 14         printf("I am the parent process, my process ID is %d\n",getpid()); 13  12     sleep(3); 11     for(std::vector<pid_t>::iterator i = pidArr.begin();i!= pidArr.end();) { 10     //测试是否所有的进程都已启动  9       if(kill(*i, 0) != 0) {  8         --run_child;  7         i = pidArr.erase(i);  6         } else {  5             ++i;  4             //printf("%d process is started!\n",i);  3         }  2     }  1     int status = 0;        time_t preTime = 0;                                                                                                           1     time_t curTime = 0;  2   3     while(run_child > 0) {  4         father_pid = wait(&status);  5         --run_child;  6         if(isAbnormalExit(father_pid, status)) {curTime = time(NULL); 13             if((curTime - preTime) > 2) { 12                father_pid = startChild(pidArr,f); 11                if(father_pid<0) 10                     printf("error in fork!");  9                else if(father_pid==0)  8                     printf("I am the child process, my process ID is %d, father is %d\n",getpid(),getppid());  7                else  6                     printf("I am the parent process, my process ID is %d\n",getpid());  5             }  4             preTime = curTime;  3         }  2     }  1 }

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