#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <pthread.h>

int p[2];

void *run(void *arg) {
  ssize_t res;
  char tmp[128];
  fprintf(stderr, "reading...\n");
  res = read(p[0], tmp, sizeof(tmp));
  fprintf(stderr, "read result: %d\n", (int)res);
  if (res < 0) {
    perror("read");
  }
  return arg;
}

int main(int argc, char **argv) {
  pthread_t t;
  int d = open("/dev/null", O_RDONLY);
  if (pipe(p) != 0) {
    perror("pipe");
    return 1;
  }
  if (pthread_create(&t, NULL, run, NULL) != 0) {
    perror("thread create");
    return 1;
  }
  sleep(1);
  d = open("/dev/null", O_RDONLY);
  if (d < 0) {
    perror("open dev null");
    exit(1);
  }
  if (dup2(d, p[0]) < 0) {
    perror("dup2");
    exit(1);
  }
  if (pthread_join(t, NULL) != 0) {
    perror("thread join");
    exit(1);
  }
  return 0;
}