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pipepong.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
00003  * Version: MPL 1.1/GPL 2.0/LGPL 2.1
00004  *
00005  * The contents of this file are subject to the Mozilla Public License Version
00006  * 1.1 (the "License"); you may not use this file except in compliance with
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00009  *
00010  * Software distributed under the License is distributed on an "AS IS" basis,
00011  * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
00012  * for the specific language governing rights and limitations under the
00013  * License.
00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
00016  *
00017  * The Initial Developer of the Original Code is
00018  * Netscape Communications Corporation.
00019  * Portions created by the Initial Developer are Copyright (C) 1999-2000
00020  * the Initial Developer. All Rights Reserved.
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00022  * Contributor(s):
00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
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00027  * in which case the provisions of the GPL or the LGPL are applicable instead
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /*
00039  * File: pipepong.c
00040  *
00041  * Description:
00042  * This test runs in conjunction with the pipeping test.
00043  * The pipeping test creates two pipes and redirects the
00044  * stdin and stdout of this test to the pipes.  Then the
00045  * pipeping test writes "ping" to this test and this test
00046  * writes "pong" back.  Note that this test does not depend
00047  * on NSPR at all.  To run this pair of tests, just invoke
00048  * pipeping.
00049  *
00050  * Tested areas: process creation, pipes, file descriptor
00051  * inheritance, standard I/O redirection.
00052  */
00053 
00054 #include <stdio.h>
00055 #include <string.h>
00056 #include <stdlib.h>
00057 
00058 #define NUM_ITERATIONS 10
00059 
00060 int main()
00061 {
00062     char buf[1024];
00063     size_t nBytes;
00064     int idx;
00065 
00066     for (idx = 0; idx < NUM_ITERATIONS; idx++) {
00067         memset(buf, 0, sizeof(buf));
00068         nBytes = fread(buf, 1, 5, stdin);
00069         fprintf(stderr, "pong process: received \"%s\"\n", buf);
00070         if (nBytes != 5) {
00071             fprintf(stderr, "pong process: expected 5 bytes but got %d bytes\n",
00072                     nBytes);
00073             exit(1);
00074         }
00075         if (strcmp(buf, "ping") != 0) {
00076             fprintf(stderr, "pong process: expected \"ping\" but got \"%s\"\n",
00077                     buf);
00078             exit(1);
00079         }
00080 
00081         strcpy(buf, "pong");
00082         fprintf(stderr, "pong process: sending \"%s\"\n", buf);
00083         nBytes = fwrite(buf, 1, 5, stdout);
00084         if (nBytes != 5) {
00085             fprintf(stderr, "pong process: fwrite failed\n");
00086             exit(1);
00087         }
00088         fflush(stdout);
00089     }
00090 
00091     return 0;
00092 }