用模板的方式创建守护进程代码实例

#include "wrap.h"
#define MYDOMAIN_FLAG "/tmp/.mydomain_log"

void domain_end(){
 Unlink(MYDOMAIN_FLAG);
}
int domain_init(){
 int fd;
 fd=open(MYDOMAIN_FLAG,O_RDWR|O_CREAT|O_EXCL|O_APPEND,0600);
 if(fd==-1)
  err_sys(errno,"domain faild, %s",MYDOMAIN_FLAG);
 Dup2(fd,1);
 Dup2(fd,2);
 return fd;
}

int work(int argc,char **argv){
 while(1){
  sleep(60);
  err_msg("one loop....");
 }
 return 0;
}
int start_domain(int argc,char **argv,int (*work)(int argc,char **argv)){
 pid_t pid;
 int  fd,ecode;
 fd=domain_init();
 if(Fork()==0){
  if(Fork()==0){
   Atexit(domain_end);
   err_msg("domain has ran sucessfully....");
   
   ecode=work(argc,argv);
   exit(ecode);
  }
  exit(0);
 }
 Wait(NULL);
 return 0;
}
int main(int argc,char **argv){
 return start_domain(argc,argv,work);
}