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#include <sys/types.h>   #include <sys/stat.h>   #include <stdio.h>   #include <stdlib.h>   #include <string.h>   #include <fcntl.h>   #include <errno.h>   #include <unistd.h>   #include <time.h>   #include <syslog.h>   #include <signal.h> static int daemon_init(char *name, int dochdir, int doclosefd)   {   pid_t pid, sid, deadChildPid;   time_t timebuf;   int fd = -1;    if(name == NULL) { return -1; } pid = fork();   if  (pid  <  0)   {   perror( "fork "); return -1; }  //father process exit if(pid > 0)   {   exit(0);   }   //child continues //become session leader if((sid = setsid()) < 0)   {   perror( "setsid "); exit(1); }   //change working directory if(dochdir) { if((chdir("/")) < 0)   {   perror( "chdir ");   exit(2);   }   } //clear our file mode creation mask umask(0); //将标准输入输出重定向到空设备 if(doclosefd) { fd = open ("/dev/null", O_RDWR, 0); if (fd != -1) { dup2 (fd, STDIN_FILENO); dup2 (fd, STDOUT_FILENO); dup2 (fd, STDERR_FILENO); if (fd > 2) close (fd); } } if((pid=fork()) == 0)   {   return 0;  } else if(pid > 0) { deadChildPid = wait(NULL); printf("create a new process !\n"); if(execl(name, name, "executed by execl", NULL)<0)            perror("Err on execl"); } exit(0); }   int main(int argc, char *argv[]) { daemon_init("./test", 0, 0); while(1) {   printf("The process ID is %d\n", (int)getpid()); printf("The parent process ID is %d\n", (int)getppid()); sleep(5);   } return 0; }

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