1:  #include <unistd.h> 

   2:  #include <signal.h> 

   3:  #include <sys/types.h> 

   4:  #include <sys/stat.h> 

   5:  #include <stdio.h> 

   6:  #include <stdlib.h>

   7:   

   8:  #ifndef NOFILE 

   9:  #define NOFILE 3 

  10:  #endif

  11:   

  12:  void init_daemon() 

  13:  { 

  14:          int pid; 

  15:          int i; 

  16:          if(pid = fork()) exit(0); //父進(jìn)程，退出 

  17:   

  18:          else if(pid < 0) exit(1); //fork失敗 

  19:   

  20:          /* 子進(jìn)程繼續(xù)執(zhí)行 */ 

  21:          setsid(); //創(chuàng)建新的會話組，子進(jìn)程成為組長，并與控制終端分離 

  22:   

  23:          /* 防止子進(jìn)程（組長）獲取控制終端 */ 

  24:          if(pid = fork()) exit(0); //父進(jìn)程，退出 

  25:   

  26:          else if(pid < 0) exit(1); //fork錯誤，退出 

  27:   

  28:          /* 第二子進(jìn)程繼續(xù)執(zhí)行 , 第二子進(jìn)程不再是會會話組組長*/ 

  29:   

  30:          //for(i = 0; i < NOFILE; i++) /* 關(guān)閉打開的文件描述符*/ 

  31:          //{ 

  32:          //close(i); 

  33:          //} 

  34:          chdir("/tmp"); /* 切換工作目錄 */ 

  35:          umask(0); /* 重設(shè)文件創(chuàng)建掩碼 */ 

  36:          return; 

  37:  }

  38:   

  39:  int main(int argc, char* argv[])

  40:  {    

  41:      FILE *fp; 

  42:   

  43:      signal(SIGCHLD, SIG_IGN); /* 忽略子進(jìn)程結(jié)束信號，防止出現(xiàn)僵尸進(jìn)程 */ 

  44:   

  45:      init_daemon(); 

  46:   

  47:      while(1) 

  48:      { 

  49:              sleep(1);

  50:              

  51:  // 注意, 日志寫到這個目錄

  52:              if((fp = fopen("/var/tmp/test.log", "a")) != NULL) 

  53:              { 

  54:                      fprintf(fp, "%s\n", "test message"); 

  55:                      fclose(fp); 

  56:              } 

  57:      } 

  58:   

  59:      return 0;

  60:  }

   1:  #!/bin/bash

   2:   

   3:  # chkconfig: 3 3 1

   4:   

   5:  # description: web kill center

   6:   

   7:  EXEC_PATH=/usr/local/bin

   8:   

   9:  EXEC=CenterServiced

  10:   

  11:  PID_FILE=/var/run/CenterServiced.pid

  12:   

  13:  DAEMON=/usr/local/bin/CenterServiced

  14:   

  15:  if ! [ -x $EXEC_PATH/$EXEC ] ; then

  16:   

  17:  echo "ERROR: $EXEC_PATH/$EXEC not found"

  18:   

  19:  exit 1

  20:   

  21:  fi

  22:   

  23:  stop()

  24:   

  25:  {

  26:   

  27:  echo "Stoping $EXEC ..."

  28:   

  29:  killall $DAEMON >/dev/null

  30:   

  31:  echo "Shutting down $EXEC: [ OK ]"

  32:   

  33:  }

  34:   

  35:  start()

  36:   

  37:  {

  38:   

  39:  echo "Starting $EXEC ..."

  40:   

  41:  $DAEMON > /dev/null &

  42:   

  43:  echo "Starting $EXEC: [ OK ]"

  44:   

  45:  }

  46:   

  47:  restart()

  48:   

  49:  {

  50:   

  51:  stop

  52:   

  53:  start

  54:   

  55:  }

  56:   

  57:  case "$1" in

  58:   

  59:  start)

  60:   

  61:  start

  62:   

  63:  ;;

  64:   

  65:  stop)

  66:   

  67:  stop

  68:   

  69:  ;;

  70:   

  71:  restart)

  72:   

  73:  restart

  74:   

  75:  ;;

  76:   

  77:  status)

  78:   

  79:  status -p $PID_FILE $DAEMON

  80:   

  81:  ;;

  82:   

  83:  *)

  84:   

  85:  echo "Usage: service $EXEC {start|stop|restart|status}"

  86:   

  87:  exit 1

  88:   

  89:  esac

  90:   

  91:  exit $?

  92: