test2.c

这个是学习嵌入式开发的重要例子

#include <stdio.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/wait.h>

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

  if ((pid = fork()) < 0)
  {
    fprintf(stderr, "fork() failed: %s\n", strerror(errno));
    exit(1);
  }
  else if (pid == 0)
  {
    sleep(5);
    fprintf(stdout, "I'm child process, pid = %d\n", getpid());
    exit(0);
  }

  pid_t returned_pid;
  int status;

  returned_pid = wait(&status);

  sleep(1000);

  return 0;
}