io/test-lfs.c

   1 /* Some basic tests for LFS.
   2    Copyright (C) 2000-2024 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #include <unistd.h>
  20 #include <stdlib.h>
  21 #include <sys/types.h>
  22 #include <sys/stat.h>
  23 #include <fcntl.h>
  24 #include <error.h>
  25 #include <errno.h>
  26 #include <sys/resource.h>
  27 #include <support/check.h>
  28
  29 /* Prototype for our test function.  */
  30 extern void do_prepare (int argc, char *argv[]);
  31 extern int do_test (int argc, char *argv[]);
  32
  33 /* We have a preparation function.  */
  34 #define PREPARE do_prepare
  35
  36 /* This defines the `main' function and some more.  */
  37 #include <test-skeleton.c>
  38
  39 /* These are for the temporary file we generate.  */
  40 char *name;
  41 int fd;
  42
  43 /* 2^31 = 2GB.  */
  44 #define TWO_GB 2147483648LL
  45
  46 void
  47 do_prepare (int argc, char *argv[])
  48 {
  49   size_t name_len;
  50   struct rlimit64 rlim;
  51
  52   name_len = strlen (test_dir);
  53   name = xmalloc (name_len + sizeof ("/lfsXXXXXX"));
  54   mempcpy (mempcpy (name, test_dir, name_len),
  55            "/lfsXXXXXX", sizeof ("/lfsXXXXXX"));
  56
  57   /* Open our test file.   */
  58   fd = mkstemp64 (name);
  59   if (fd == -1)
  60     {
  61       if (errno == ENOSYS)
  62         {
  63           /* Fail silently.  */
  64           error (0, 0, "open64 is not supported");
  65           exit (EXIT_SUCCESS);
  66         }
  67       else
  68         error (EXIT_FAILURE, errno, "cannot create temporary file");
  69     }
  70   if (!support_descriptor_supports_holes (fd))
  71     FAIL_UNSUPPORTED ("File %s does not support holes", name);
  72   add_temp_file (name);
  73
  74   if (getrlimit64 (RLIMIT_FSIZE, &rlim) != 0)
  75     {
  76       error (0, errno, "cannot get resource limit");
  77       exit (0);
  78     }
  79   if (rlim.rlim_cur < TWO_GB + 200)
  80     {
  81       rlim.rlim_cur = TWO_GB + 200;
  82       if (setrlimit64 (RLIMIT_FSIZE, &rlim) != 0)
  83         {
  84           error (0, errno, "cannot reset file size limits");
  85           exit (0);
  86         }
  87     }
  88 }
  89
  90 static void
  91 test_ftello (void)
  92 {
  93   FILE *f;
  94   int ret;
  95   off64_t pos;
  96
  97   f = fopen64 (name, "w");
  98
  99   ret = fseeko64 (f, TWO_GB+100, SEEK_SET);
 100   if (ret == -1 && errno == ENOSYS)
 101     {
 102       error (0, 0, "fseeko64 is not supported.");
 103       exit (EXIT_SUCCESS);
 104     }
 105   if (ret == -1 && errno == EINVAL)
 106     {
 107       error (0, 0, "LFS seems not to be supported");
 108       exit (EXIT_SUCCESS);
 109     }
 110   if (ret == -1)
 111     {
 112       error (0, errno, "fseeko64 failed with error");
 113       exit (EXIT_FAILURE);
 114     }
 115
 116   ret = fwrite ("Hello", 1, 5, f);
 117   if (ret == -1 && errno == EFBIG)
 118     {
 119       error (0, errno, "LFS seems not to be supported");
 120       exit (EXIT_SUCCESS);
 121     }
 122
 123   if (ret == -1 && errno == ENOSPC)
 124     {
 125       error (0, 0, "Not enough space to write file.");
 126       exit (EXIT_SUCCESS);
 127     }
 128
 129   if (ret != 5)
 130     error (EXIT_FAILURE, errno, "Cannot write test string to large file");
 131
 132   pos = ftello64 (f);
 133
 134   if (pos != TWO_GB+105)
 135     {
 136       error (0, 0, "ftello64 gives wrong result.");
 137       exit (EXIT_FAILURE);
 138     }
 139
 140   fclose (f);
 141 }
 142
 143 int
 144 do_test (int argc, char *argv[])
 145 {
 146   int ret, fd2;
 147   struct stat64 statbuf;
 148
 149   ret = lseek64 (fd, TWO_GB+100, SEEK_SET);
 150   if (ret == -1 && errno == ENOSYS)
 151     {
 152       error (0, 0, "lseek64 is not supported.");
 153       exit (EXIT_SUCCESS);
 154     }
 155   if (ret == -1 && errno == EINVAL)
 156     {
 157       error (0, 0, "LFS seems not to be supported.");
 158       exit (EXIT_SUCCESS);
 159     }
 160   if (ret == -1)
 161     {
 162       error (0, errno, "lseek64 failed with error");
 163       exit (EXIT_FAILURE);
 164     }
 165   off64_t offset64 = lseek64 (fd, 0, SEEK_CUR);
 166   if (offset64 != TWO_GB + 100)
 167     {
 168       error (0, 0, "lseek64 did not return expected offset");
 169       exit (EXIT_FAILURE);
 170     }
 171   off_t offset = lseek (fd, 0, SEEK_CUR);
 172   if (sizeof (off_t) < sizeof (off64_t))
 173     {
 174       if (offset != -1 || errno != EOVERFLOW)
 175         {
 176           error (0, 0, "lseek did not fail with EOVERFLOW");
 177           exit (EXIT_FAILURE);
 178         }
 179     }
 180   else
 181     if (offset != TWO_GB + 100)
 182       {
 183         error (0, 0, "lseek did not return expected offset");
 184         exit (EXIT_FAILURE);
 185       }
 186
 187   ret = write (fd, "Hello", 5);
 188   if (ret == -1 && errno == EFBIG)
 189     {
 190       error (0, 0, "LFS seems not to be supported.");
 191       exit (EXIT_SUCCESS);
 192     }
 193
 194   if (ret == -1 && errno == ENOSPC)
 195     {
 196       error (0, 0, "Not enough space to write file.");
 197       exit (EXIT_SUCCESS);
 198     }
 199
 200   if (ret != 5)
 201     error (EXIT_FAILURE, errno, "cannot write test string to large file");
 202
 203   ret = close (fd);
 204
 205   if (ret == -1)
 206     error (EXIT_FAILURE, errno, "error closing file");
 207
 208   ret = stat64 (name, &statbuf);
 209
 210   if (ret == -1 && (errno == ENOSYS || errno == EOVERFLOW))
 211     error (0, 0, "stat64 is not supported.");
 212   else if (ret == -1)
 213     error (EXIT_FAILURE, errno, "cannot stat file `%s'", name);
 214   else if (statbuf.st_size != (TWO_GB + 100 + 5))
 215     error (EXIT_FAILURE, 0, "stat reported size %lld instead of %lld.",
 216            (long long int) statbuf.st_size, (TWO_GB + 100 + 5));
 217
 218   fd2 = openat64 (AT_FDCWD, name, O_RDWR);
 219   if (fd2 == -1)
 220     {
 221       if (errno == ENOSYS)
 222         {
 223           /* Silently ignore this test.  */
 224           error (0, 0, "openat64 is not supported");
 225         }
 226       else
 227         error (EXIT_FAILURE, errno, "openat64 failed to open big file");
 228     }
 229   else
 230     {
 231       ret = close (fd2);
 232
 233       if (ret == -1)
 234         error (EXIT_FAILURE, errno, "error closing file");
 235     }
 236
 237   test_ftello ();
 238
 239   return 0;
 240 }