libstdc++-v3/testsuite/experimental/filesystem/operations/last_write_time.cc

   1 // Copyright (C) 2016-2019 Free Software Foundation, Inc.
   2 //
   3 // This file is part of the GNU ISO C++ Library.  This library is free
   4 // software; you can redistribute it and/or modify it under the
   5 // terms of the GNU General Public License as published by the
   6 // Free Software Foundation; either version 3, or (at your option)
   7 // any later version.
   8
   9 // This library is distributed in the hope that it will be useful,
  10 // but WITHOUT ANY WARRANTY; without even the implied warranty of
  11 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12 // GNU General Public License for more details.
  13
  14 // You should have received a copy of the GNU General Public License along
  15 // with this library; see the file COPYING3.  If not see
  16 // <http://www.gnu.org/licenses/>.
  17
  18 // { dg-options "-DUSE_FILESYSTEM_TS -lstdc++fs" }
  19 // { dg-do run { target c++11 } }
  20 // { dg-require-filesystem-ts "" }
  21
  22 // 15.25 Permissions [fs.op.last_write_time]
  23
  24 #include <experimental/filesystem>
  25 #include <testsuite_fs.h>
  26 #include <testsuite_hooks.h>
  27
  28 #ifdef _GLIBCXX_HAVE_FCNTL_H
  29 # include <fcntl.h>
  30 #endif
  31 #if _GLIBCXX_HAVE_UTIME_H
  32 # include <utime.h>
  33 #endif
  34
  35 using time_type = std::experimental::filesystem::file_time_type;
  36
  37 void
  38 test01()
  39 {
  40   // read times
  41
  42   auto p = __gnu_test::nonexistent_path();
  43   std::error_code ec;
  44   time_type mtime = last_write_time(p, ec);
  45   VERIFY( ec );
  46   VERIFY( ec == std::make_error_code(std::errc::no_such_file_or_directory) );
  47 #if __cpp_exceptions
  48   bool caught = false;
  49   try {
  50     mtime = last_write_time(p);
  51   } catch (std::system_error const& e) {
  52     caught = true;
  53     ec = e.code();
  54   }
  55   VERIFY( caught );
  56   VERIFY( ec );
  57   VERIFY( ec == std::make_error_code(std::errc::no_such_file_or_directory) );
  58 #endif
  59
  60   __gnu_test::scoped_file file(p);
  61   VERIFY( exists(p) );
  62   mtime = last_write_time(p, ec);
  63   VERIFY( !ec );
  64   VERIFY( mtime <= time_type::clock::now() );
  65   VERIFY( mtime == last_write_time(p) );
  66
  67   auto end_of_time = time_type::duration::max();
  68   auto last_second
  69     = std::chrono::duration_cast<std::chrono::seconds>(end_of_time).count();
  70   if (last_second > std::numeric_limits<std::time_t>::max())
  71     return; // can't test overflow
  72
  73 #if _GLIBCXX_USE_UTIMENSAT
  74   struct ::timespec ts[2];
  75   ts[0].tv_sec = 0;
  76   ts[0].tv_nsec = UTIME_NOW;
  77   ts[1].tv_sec = std::numeric_limits<std::time_t>::max() - 1;
  78   ts[1].tv_nsec = 0;
  79   VERIFY( !::utimensat(AT_FDCWD, p.c_str(), ts, 0) );
  80 #elif _GLIBCXX_HAVE_UTIME_H
  81   ::utimbuf times;
  82   times.modtime = std::numeric_limits<std::time_t>::max() - 1;
  83   times.actime = std::numeric_limits<std::time_t>::max() - 1;
  84   VERIFY( !::utime(p.string().c_str(), &times) );
  85 #else
  86   return;
  87 #endif
  88
  89   mtime = last_write_time(p, ec);
  90   VERIFY( ec );
  91   VERIFY( ec == std::make_error_code(std::errc::value_too_large) );
  92   VERIFY( mtime == time_type::min() );
  93
  94 #if __cpp_exceptions
  95   caught = false;
  96   try {
  97     mtime = last_write_time(p);
  98   } catch (std::system_error const& e) {
  99     caught = true;
 100     ec = e.code();
 101   }
 102   VERIFY( caught );
 103   VERIFY( ec );
 104   VERIFY( ec == std::make_error_code(std::errc::value_too_large) );
 105 #endif
 106 }
 107
 108 bool approx_equal(time_type file_time, time_type expected)
 109 {
 110   auto delta = expected - file_time;
 111   if (delta < delta.zero())
 112     delta = -delta;
 113   return delta < std::chrono::seconds(1);
 114 }
 115
 116 void
 117 test02()
 118 {
 119   // write times
 120
 121   __gnu_test::scoped_file f;
 122   std::error_code ec;
 123   time_type time;
 124
 125   time = last_write_time(f.path);
 126   last_write_time(f.path, time, ec);
 127   VERIFY( !ec );
 128   VERIFY( approx_equal(last_write_time(f.path), time) );
 129
 130   time -= std::chrono::milliseconds(1000 * 60 * 10 + 15);
 131   last_write_time(f.path, time, ec);
 132   VERIFY( !ec );
 133   VERIFY( approx_equal(last_write_time(f.path), time) );
 134
 135   time += std::chrono::milliseconds(1000 * 60 * 20 + 15);
 136   last_write_time(f.path, time, ec);
 137   VERIFY( !ec );
 138   VERIFY( approx_equal(last_write_time(f.path), time) );
 139
 140   time = time_type();
 141   last_write_time(f.path, time, ec);
 142   VERIFY( !ec );
 143   VERIFY( approx_equal(last_write_time(f.path), time) );
 144
 145   time -= std::chrono::milliseconds(1000 * 60 * 10 + 15);
 146   last_write_time(f.path, time, ec);
 147   VERIFY( !ec );
 148   VERIFY( approx_equal(last_write_time(f.path), time) );
 149 }
 150
 151 int
 152 main()
 153 {
 154   test01();
 155   test02();
 156 }