/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

/*
 * File: fdcach.c
 * Description:
 *   This test verifies that the fd cache is working
 *   correctly.
 */

#include "nspr.h"

#include <stdio.h>
#include <stdlib.h>

/*
 * Define ORDER_PRESERVED if the implementation of PR_SetFDCacheSize
 * preserves the ordering of the fd's when moving them between the
 * cache.
 */
#define ORDER_PRESERVED 1

/*
 * NUM_FDS must be <= FD_CACHE_SIZE.
 */
#define FD_CACHE_SIZE 1024
#define NUM_FDS 20

int main(int argc, char** argv) {
  int i;
  PRFileDesc* fds[NUM_FDS];
  PRFileDesc* savefds[NUM_FDS];
  int numfds = sizeof(fds) / sizeof(fds[0]);

  PR_SetFDCacheSize(0, FD_CACHE_SIZE);

  /* Add some fd's to the fd cache. */
  for (i = 0; i < numfds; i++) {
    savefds[i] = PR_NewTCPSocket();
    if (NULL == savefds[i]) {
      fprintf(stderr, "PR_NewTCPSocket failed\n");
      exit(1);
    }
  }
  for (i = 0; i < numfds; i++) {
    if (PR_Close(savefds[i]) == PR_FAILURE) {
      fprintf(stderr, "PR_Close failed\n");
      exit(1);
    }
  }

  /*
   * Create some fd's.  These fd's should come from
   * the fd cache.  Verify the FIFO ordering of the fd
   * cache.
   */
  for (i = 0; i < numfds; i++) {
    fds[i] = PR_NewTCPSocket();
    if (NULL == fds[i]) {
      fprintf(stderr, "PR_NewTCPSocket failed\n");
      exit(1);
    }
    if (fds[i] != savefds[i]) {
      fprintf(stderr, "fd cache malfunctioned\n");
      exit(1);
    }
  }
  /* Put the fd's back to the fd cache. */
  for (i = 0; i < numfds; i++) {
    if (PR_Close(savefds[i]) == PR_FAILURE) {
      fprintf(stderr, "PR_Close failed\n");
      exit(1);
    }
  }

  /* Switch to the fd cache. */
  PR_SetFDCacheSize(0, FD_CACHE_SIZE);

  for (i = 0; i < numfds; i++) {
    fds[i] = PR_NewTCPSocket();
    if (NULL == fds[i]) {
      fprintf(stderr, "PR_NewTCPSocket failed\n");
      exit(1);
    }
#ifdef ORDER_PRESERVED
    if (fds[i] != savefds[i]) {
      fprintf(stderr, "fd cache malfunctioned\n");
      exit(1);
    }
#else
    savefds[i] = fds[i];
#endif
  }
  for (i = 0; i < numfds; i++) {
    if (PR_Close(savefds[i]) == PR_FAILURE) {
      fprintf(stderr, "PR_Close failed\n");
      exit(1);
    }
  }

  for (i = 0; i < numfds; i++) {
    fds[i] = PR_NewTCPSocket();
    if (NULL == fds[i]) {
      fprintf(stderr, "PR_NewTCPSocket failed\n");
      exit(1);
    }
    if (fds[i] != savefds[i]) {
      fprintf(stderr, "fd cache malfunctioned\n");
      exit(1);
    }
  }
  for (i = 0; i < numfds; i++) {
    if (PR_Close(savefds[i]) == PR_FAILURE) {
      fprintf(stderr, "PR_Close failed\n");
      exit(1);
    }
  }

  PR_Cleanup();
  printf("PASS\n");
  return 0;
}