nsprpub/pr/tests/pipepong.c

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 /*
   7  * File: pipepong.c
   8  *
   9  * Description:
  10  * This test runs in conjunction with the pipeping test.
  11  * The pipeping test creates two pipes and redirects the
  12  * stdin and stdout of this test to the pipes.  Then the
  13  * pipeping test writes "ping" to this test and this test
  14  * writes "pong" back.  Note that this test does not depend
  15  * on NSPR at all.  To run this pair of tests, just invoke
  16  * pipeping.
  17  *
  18  * Tested areas: process creation, pipes, file descriptor
  19  * inheritance, standard I/O redirection.
  20  */
  21
  22 #include <stdio.h>
  23 #include <string.h>
  24 #include <stdlib.h>
  25
  26 #define NUM_ITERATIONS 10
  27
  28 int main(int argc, char **argv)
  29 {
  30     char buf[1024];
  31     size_t nBytes;
  32     int idx;
  33
  34     for (idx = 0; idx < NUM_ITERATIONS; idx++) {
  35         memset(buf, 0, sizeof(buf));
  36         nBytes = fread(buf, 1, 5, stdin);
  37         fprintf(stderr, "pong process: received \"%s\"\n", buf);
  38         if (nBytes != 5) {
  39             fprintf(stderr, "pong process: expected 5 bytes but got %d bytes\n",
  40                     nBytes);
  41             exit(1);
  42         }
  43         if (strcmp(buf, "ping") != 0) {
  44             fprintf(stderr, "pong process: expected \"ping\" but got \"%s\"\n",
  45                     buf);
  46             exit(1);
  47         }
  48
  49         strcpy(buf, "pong");
  50         fprintf(stderr, "pong process: sending \"%s\"\n", buf);
  51         nBytes = fwrite(buf, 1, 5, stdout);
  52         if (nBytes != 5) {
  53             fprintf(stderr, "pong process: fwrite failed\n");
  54             exit(1);
  55         }
  56         fflush(stdout);
  57     }
  58
  59     return 0;
  60 }