/* 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/. */

/*
 * Test: zerolen.c
 *
 * Description: a test for Bugzilla bug #17699.  We perform
 * the same test for PR_Writev, PR_Write, and PR_Send.  In
 * each test the server thread first fills up the connection
 * to the client so that the next write operation will fail
 * with EAGAIN.  Then it calls PR_Writev, PR_Write, or PR_Send
 * with a zero-length buffer.  The client thread initially
 * does not read so that the connection can be filled up.
 * Then it empties the connection so that the server thread's
 * PR_Writev, PR_Write, or PR_Send call can succeed.
 *
 * Bug #17699 is specific to the pthreads version on Unix,
 * so on other platforms this test does nothing.
 */

#ifndef XP_UNIX

#  include <stdio.h>

int main(int argc, char** argv) {
  printf("PASS\n");
  return 0;
}

#else /* XP_UNIX */

#  include "nspr.h"
#  include "private/pprio.h"

#  include <stdio.h>
#  include <stdlib.h>
#  include <string.h>
#  include <errno.h>
#  include <unistd.h>

static void ClientThread(void* arg) {
  PRFileDesc* sock;
  PRNetAddr addr;
  PRUint16 port = (PRUint16)arg;
  char buf[1024];
  PRInt32 nbytes;

  sock = PR_NewTCPSocket();
  if (NULL == sock) {
    fprintf(stderr, "PR_NewTCPSocket failed\n");
    exit(1);
  }
  if (PR_InitializeNetAddr(PR_IpAddrLoopback, port, &addr) == PR_FAILURE) {
    fprintf(stderr, "PR_InitializeNetAddr failed\n");
    exit(1);
  }
  if (PR_Connect(sock, &addr, PR_INTERVAL_NO_TIMEOUT) == PR_FAILURE) {
    fprintf(stderr, "PR_Connect failed\n");
    exit(1);
  }
  /*
   * Sleep 5 seconds to force the server thread to get EAGAIN.
   */
  if (PR_Sleep(PR_SecondsToInterval(5)) == PR_FAILURE) {
    fprintf(stderr, "PR_Sleep failed\n");
    exit(1);
  }
  /*
   * Then start reading.
   */
  while (nbytes = PR_Read(sock, buf, sizeof(buf)) > 0) {
    /* empty loop body */
  }
  if (-1 == nbytes) {
    fprintf(stderr, "PR_Read failed\n");
    exit(1);
  }
  if (PR_Close(sock) == PR_FAILURE) {
    fprintf(stderr, "PR_Close failed\n");
    exit(1);
  }
}

int main() {
  PRFileDesc* listenSock;
  PRFileDesc* acceptSock;
  int osfd;
  PRThread* clientThread;
  PRNetAddr addr;
  char buf[1024];
  PRInt32 nbytes;
  PRIOVec iov;

  memset(buf, 0, sizeof(buf)); /* Initialize the buffer. */
  listenSock = PR_NewTCPSocket();
  if (NULL == listenSock) {
    fprintf(stderr, "PR_NewTCPSocket failed\n");
    exit(1);
  }
  if (PR_InitializeNetAddr(PR_IpAddrAny, 0, &addr) == PR_FAILURE) {
    fprintf(stderr, "PR_InitializeNetAddr failed\n");
    exit(1);
  }
  if (PR_Bind(listenSock, &addr) == PR_FAILURE) {
    fprintf(stderr, "PR_Bind failed\n");
    exit(1);
  }
  /* Find out what port number we are bound to. */
  if (PR_GetSockName(listenSock, &addr) == PR_FAILURE) {
    fprintf(stderr, "PR_GetSockName failed\n");
    exit(1);
  }
  if (PR_Listen(listenSock, 5) == PR_FAILURE) {
    fprintf(stderr, "PR_Listen failed\n");
    exit(1);
  }

  /*
   * First test PR_Writev.
   */
  clientThread = PR_CreateThread(
      PR_USER_THREAD, ClientThread, (void*)PR_ntohs(PR_NetAddrInetPort(&addr)),
      PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
  if (NULL == clientThread) {
    fprintf(stderr, "PR_CreateThread failed\n");
    exit(1);
  }
  acceptSock = PR_Accept(listenSock, NULL, PR_INTERVAL_NO_TIMEOUT);
  if (NULL == acceptSock) {
    fprintf(stderr, "PR_Accept failed\n");
    exit(1);
  }
  osfd = PR_FileDesc2NativeHandle(acceptSock);
  while (write(osfd, buf, sizeof(buf)) != -1) {
    /* empty loop body */
  }
  if ((errno != EAGAIN) && (errno != EWOULDBLOCK)) {
    fprintf(stderr, "write failed\n");
    exit(1);
  }
  iov.iov_base = buf;
  iov.iov_len = 0;
  printf("calling PR_Writev with a zero-length buffer\n");
  fflush(stdout);
  nbytes = PR_Writev(acceptSock, &iov, 1, PR_INTERVAL_NO_TIMEOUT);
  if (nbytes != 0) {
    fprintf(stderr, "PR_Writev should return 0 but returns %d\n", nbytes);
    exit(1);
  }
  if (PR_Close(acceptSock) == PR_FAILURE) {
    fprintf(stderr, "PR_Close failed\n");
    exit(1);
  }
  if (PR_JoinThread(clientThread) == PR_FAILURE) {
    fprintf(stderr, "PR_JoinThread failed\n");
    exit(1);
  }

  /*
   * Then test PR_Write.
   */
  clientThread = PR_CreateThread(
      PR_USER_THREAD, ClientThread, (void*)PR_ntohs(PR_NetAddrInetPort(&addr)),
      PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
  if (NULL == clientThread) {
    fprintf(stderr, "PR_CreateThread failed\n");
    exit(1);
  }
  acceptSock = PR_Accept(listenSock, NULL, PR_INTERVAL_NO_TIMEOUT);
  if (NULL == acceptSock) {
    fprintf(stderr, "PR_Accept failed\n");
    exit(1);
  }
  osfd = PR_FileDesc2NativeHandle(acceptSock);
  while (write(osfd, buf, sizeof(buf)) != -1) {
    /* empty loop body */
  }
  if ((errno != EAGAIN) && (errno != EWOULDBLOCK)) {
    fprintf(stderr, "write failed\n");
    exit(1);
  }
  printf("calling PR_Write with a zero-length buffer\n");
  fflush(stdout);
  nbytes = PR_Write(acceptSock, buf, 0);
  if (nbytes != 0) {
    fprintf(stderr, "PR_Write should return 0 but returns %d\n", nbytes);
    exit(1);
  }
  if (PR_Close(acceptSock) == PR_FAILURE) {
    fprintf(stderr, "PR_Close failed\n");
    exit(1);
  }
  if (PR_JoinThread(clientThread) == PR_FAILURE) {
    fprintf(stderr, "PR_JoinThread failed\n");
    exit(1);
  }

  /*
   * Finally test PR_Send.
   */
  clientThread = PR_CreateThread(
      PR_USER_THREAD, ClientThread, (void*)PR_ntohs(PR_NetAddrInetPort(&addr)),
      PR_PRIORITY_NORMAL, PR_GLOBAL_THREAD, PR_JOINABLE_THREAD, 0);
  if (NULL == clientThread) {
    fprintf(stderr, "PR_CreateThread failed\n");
    exit(1);
  }
  acceptSock = PR_Accept(listenSock, NULL, PR_INTERVAL_NO_TIMEOUT);
  if (NULL == acceptSock) {
    fprintf(stderr, "PR_Accept failed\n");
    exit(1);
  }
  osfd = PR_FileDesc2NativeHandle(acceptSock);
  while (write(osfd, buf, sizeof(buf)) != -1) {
    /* empty loop body */
  }
  if ((errno != EAGAIN) && (errno != EWOULDBLOCK)) {
    fprintf(stderr, "write failed\n");
    exit(1);
  }
  printf("calling PR_Send with a zero-length buffer\n");
  fflush(stdout);
  nbytes = PR_Send(acceptSock, buf, 0, 0, PR_INTERVAL_NO_TIMEOUT);
  if (nbytes != 0) {
    fprintf(stderr, "PR_Send should return 0 but returns %d\n", nbytes);
    exit(1);
  }
  if (PR_Close(acceptSock) == PR_FAILURE) {
    fprintf(stderr, "PR_Close failed\n");
    exit(1);
  }
  if (PR_JoinThread(clientThread) == PR_FAILURE) {
    fprintf(stderr, "PR_JoinThread failed\n");
    exit(1);
  }

  if (PR_Close(listenSock) == PR_FAILURE) {
    fprintf(stderr, "PR_Close failed\n");
    exit(1);
  }
  printf("PASS\n");
  return 0;
}

#endif /* XP_UNIX */