test1.c

这个是学习嵌入式开发的重要例子

#include <unistd.h>
#include <stdio.h>
#include <sys/types.h>

int main(int argc, char **argv)
{
  //pid_t getpgid(pid_t pid);

  pid_t process_group_id;

  //process_group_id = getpgid(getpid());
  process_group_id = getpgid(0);

  fprintf(stdout, "process group id = %d\n", process_group_id);

  sleep(1000);

  return 0;
}