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pipepong2.c
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00001 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
00002 /* ***** BEGIN LICENSE BLOCK *****
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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
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00014  *
00015  * The Original Code is the Netscape Portable Runtime (NSPR).
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00017  * The Initial Developer of the Original Code is
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00019  * Portions created by the Initial Developer are Copyright (C) 2000
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00023  *
00024  * Alternatively, the contents of this file may be used under the terms of
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00036  * ***** END LICENSE BLOCK ***** */
00037 
00038 /*
00039  * File: pipepong2.c
00040  *
00041  * Description:
00042  * This test runs in conjunction with the pipeping2 test.
00043  * The pipeping2 test creates two pipes and passes two
00044  * pipe fd's to this test.  Then the pipeping2 test writes
00045  * "ping" to this test and this test writes "pong" back.
00046  * To run this pair of tests, just invoke pipeping2.
00047  *
00048  * Tested areas: process creation, pipes, file descriptor
00049  * inheritance.
00050  */
00051 
00052 #include "prerror.h"
00053 #include "prio.h"
00054 
00055 #include <stdio.h>
00056 #include <string.h>
00057 #include <stdlib.h>
00058 
00059 #define NUM_ITERATIONS 10
00060 
00061 int main()
00062 {
00063     PRFileDesc *pipe_read, *pipe_write;
00064     PRStatus status;
00065     char buf[1024];
00066     PRInt32 nBytes;
00067     int idx;
00068 
00069     pipe_read = PR_GetInheritedFD("PIPE_READ");
00070     if (pipe_read == NULL) {
00071         fprintf(stderr, "PR_GetInheritedFD failed\n");
00072         exit(1);
00073     }
00074     status = PR_SetFDInheritable(pipe_read, PR_FALSE);
00075     if (status == PR_FAILURE) {
00076         fprintf(stderr, "PR_SetFDInheritable failed\n");
00077         exit(1);
00078     }
00079     pipe_write = PR_GetInheritedFD("PIPE_WRITE");
00080     if (pipe_write == NULL) {
00081         fprintf(stderr, "PR_GetInheritedFD failed\n");
00082         exit(1);
00083     }
00084     status = PR_SetFDInheritable(pipe_write, PR_FALSE);
00085     if (status == PR_FAILURE) {
00086         fprintf(stderr, "PR_SetFDInheritable failed\n");
00087         exit(1);
00088     }
00089 
00090     for (idx = 0; idx < NUM_ITERATIONS; idx++) {
00091         memset(buf, 0, sizeof(buf));
00092         nBytes = PR_Read(pipe_read, buf, sizeof(buf));
00093         if (nBytes == -1) {
00094             fprintf(stderr, "PR_Read failed: (%d, %d)\n",
00095                     PR_GetError(), PR_GetOSError());
00096             exit(1);
00097         }
00098         printf("pong process: received \"%s\"\n", buf);
00099         if (nBytes != 5) {
00100             fprintf(stderr, "pong process: expected 5 bytes but got %d bytes\n",
00101                     nBytes);
00102             exit(1);
00103         }
00104         if (strcmp(buf, "ping") != 0) {
00105             fprintf(stderr, "pong process: expected \"ping\" but got \"%s\"\n",
00106                     buf);
00107             exit(1);
00108         }
00109 
00110         strcpy(buf, "pong");
00111         printf("pong process: sending \"%s\"\n", buf);
00112         nBytes = PR_Write(pipe_write, buf, 5);
00113         if (nBytes == -1) {
00114             fprintf(stderr, "PR_Write failed\n");
00115             exit(1);
00116         }
00117     }
00118 
00119     status = PR_Close(pipe_read);
00120     if (status == PR_FAILURE) {
00121         fprintf(stderr, "PR_Close failed\n");
00122         exit(1);
00123     }
00124     status = PR_Close(pipe_write);
00125     if (status == PR_FAILURE) {
00126         fprintf(stderr, "PR_Close failed\n");
00127         exit(1);
00128     }
00129     return 0;
00130 }