src/base/atomicio.test.cc

   1 /*
   2  * Copyright (c) 2019 The Regents of the University of California
   3  * All rights reserved
   4  *
   5  * The license below extends only to copyright in the software and shall
   6  * not be construed as granting a license to any other intellectual
   7  * property including but not limited to intellectual property relating
   8  * to a hardware implementation of the functionality of the software
   9  * licensed hereunder.  You may use the software subject to the license
  10  * terms below provided that you ensure that this notice is replicated
  11  * unmodified and in its entirety in all distributions of the software,
  12  * modified or unmodified, in source code or in binary form.
  13  *
  14  * Redistribution and use in source and binary forms, with or without
  15  * modification, are permitted provided that the following conditions are
  16  * met: redistributions of source code must retain the above copyright
  17  * notice, this list of conditions and the following disclaimer;
  18  * redistributions in binary form must reproduce the above copyright
  19  * notice, this list of conditions and the following disclaimer in the
  20  * documentation and/or other materials provided with the distribution;
  21  * neither the name of the copyright holders nor the names of its
  22  * contributors may be used to endorse or promote products derived from
  23  * this software without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  * Authors: Bobby R. Bruce
  38  */
  39
  40 #include <gtest/gtest.h>
  41 #include <unistd.h>
  42
  43 #include <string>
  44
  45 #include "base/atomicio.hh"
  46
  47 /*
  48  * This will test reading from a file with a buffer capable of storing the
  49  * entirity of the file.
  50  */
  51 TEST(AtomicioTest, AtomicReadBigBuffer)
  52 {
  53     FILE* file;
  54     file = tmpfile();
  55
  56     std::string file_contents = "This is just some test data to ensure that we"
  57                                 " can read correctly from a file.";
  58
  59     fputs(file_contents.c_str(), file);
  60     fflush(file);
  61     rewind(file);
  62
  63     char s[1000];
  64
  65     ssize_t size = atomic_read(fileno(file), s, 1000);
  66     fclose(file);
  67
  68     EXPECT_EQ(file_contents.size(), size);
  69     for (unsigned int i = 0; i < size; i++) {
  70         EXPECT_EQ(file_contents[i], s[i]);
  71     }
  72 }
  73
  74 /*
  75  * This will test reading from a file using a buffer smaller than the file
  76  * contents. The buffer should be filled and the remainder left unread.
  77  */
  78 TEST(AtomicioTest, AtomicReadSmallBuffer)
  79 {
  80     FILE* file;
  81     file = tmpfile();
  82
  83     std::string file_contents = "This is just some test data to ensure that we"
  84                                 " can read correctly from a file.";
  85
  86     fputs(file_contents.c_str(), file);
  87     fflush(file);
  88     rewind(file);
  89
  90     char s[10];
  91
  92     ssize_t size = atomic_read(fileno(file), s, 10);
  93     fclose(file);
  94
  95     EXPECT_EQ(10, size);
  96     for (unsigned int i = 0; i < size; i++) {
  97         EXPECT_EQ(file_contents[i], s[i]);
  98     }
  99 }
 100
 101 /*
 102  * This tests writing a string to a file via the atomic_write function.
 103  */
 104 TEST(AtomicioTest, AtomicWrite)
 105 {
 106     FILE* file;
 107     file = tmpfile();
 108
 109     std::string file_contents = "This is just some test data to ensure that we"
 110                                 " can write correctly to a file.";
 111
 112     ssize_t size = atomic_write(fileno(file),
 113                                 file_contents.c_str(),
 114                                 file_contents.size());
 115     fflush(file);
 116     rewind(file);
 117
 118     EXPECT_EQ(file_contents.size(), size);
 119
 120     char c;
 121     for (unsigned int i = 0; (c = fgetc(file)) != EOF; i++) {
 122         EXPECT_EQ(file_contents[i], c);
 123     }
 124
 125     fclose(file);
 126 }