Test Procedure

In terminal 1

> mkfifo test.fifo
> gcc test.c
> ./a.out

In terminal 2

> cat >test.fifo
(Interrupt with ctl+C)

test_select.c

#include <sys/types.h>
#include <sys/select.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdio.h>
#include <stdlib.h>

int main() {
  int fd;
  int active;
  int eof_count = 0;
  int ret;
  unsigned char buffer[10];
  fd_set readfds;

  FD_ZERO(&readfds);

  fd = open("test.fifo", 0);
  if (fd < 0) {
    perror("open()");
    exit(1);
  }

  FD_SET(fd, &readfds);

  while (eof_count < 2) {
    active = select(fd+1, &readfds, NULL, NULL, NULL);
    if (active == -1) {
      perror("select()");
      exit(1);
    }

    ret = read(fd, &buffer, 10);
    if (ret == 0) {
      printf("Saw an end of file\n");
      eof_count += 1;
    }
  }
  printf("Saw more than 1 EOF, exiting");
  exit(0);
}