File: tst-copy_file_range.c

package info (click to toggle)
glibc 2.29-3
  • links: PTS, VCS
  • area: main
  • in suites: bullseye, sid
  • size: 271,436 kB
  • sloc: ansic: 1,013,441; asm: 261,303; makefile: 11,428; sh: 10,300; python: 8,944; cpp: 5,062; awk: 1,956; perl: 514; yacc: 290; pascal: 182; sed: 73
file content (298 lines) | stat: -rw-r--r-- 8,628 bytes parent folder | download | duplicates (7)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
/* Tests for copy_file_range.
   Copyright (C) 2017-2019 Free Software Foundation, Inc.
   This file is part of the GNU C Library.

   The GNU C Library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.

   The GNU C Library is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public
   License along with the GNU C Library; if not, see
   <http://www.gnu.org/licenses/>.  */

#include <array_length.h>
#include <errno.h>
#include <fcntl.h>
#include <inttypes.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <support/check.h>
#include <support/support.h>
#include <support/temp_file.h>
#include <support/test-driver.h>
#include <support/xunistd.h>

/* Boolean flags which indicate whether to use pointers with explicit
   output flags.  */
static int do_inoff;
static int do_outoff;

/* Name and descriptors of the input files.  Files are truncated and
   reopened (with O_RDWR) between tests.  */
static char *infile;
static int infd;
static char *outfile;
static int outfd;

/* Input and output offsets.  Set according to do_inoff and do_outoff
   before the test.  The offsets themselves are always set to
   zero.  */
static off64_t inoff;
static off64_t *pinoff;
static off64_t outoff;
static off64_t *poutoff;

/* These are a collection of copy sizes used in tests.    */
enum { maximum_size = 99999 };
static const int typical_sizes[] =
  { 0, 1, 2, 3, 1024, 2048, 4096, 8191, 8192, 8193, maximum_size };

/* The random contents of this array can be used as a pattern to check
   for correct write operations.  */
static unsigned char random_data[maximum_size];

/* The size chosen by the test harness.  */
static int current_size;

/* Perform a copy of a file.  */
static void
simple_file_copy (void)
{
  xwrite (infd, random_data, current_size);

  int length;
  int in_skipped; /* Expected skipped bytes in input.  */
  if (do_inoff)
    {
      xlseek (infd, 1, SEEK_SET);
      inoff = 2;
      length = current_size - 3;
      in_skipped = 2;
    }
  else
    {
      xlseek (infd, 3, SEEK_SET);
      length = current_size - 5;
      in_skipped = 3;
    }
  int out_skipped; /* Expected skipped bytes before the written data.  */
  if (do_outoff)
    {
      xlseek (outfd, 4, SEEK_SET);
      outoff = 5;
      out_skipped = 5;
    }
  else
    {
      xlseek (outfd, 6, SEEK_SET);
      length = current_size - 6;
      out_skipped = 6;
    }
  if (length < 0)
    length = 0;

  TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
                                 length, 0), length);
  if (do_inoff)
    {
      TEST_COMPARE (inoff, 2 + length);
      TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1);
    }
  else
    TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 3 + length);
  if (do_outoff)
    {
      TEST_COMPARE (outoff, 5 + length);
      TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 4);
    }
  else
    TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 6 + length);

  struct stat64 st;
  xfstat (outfd, &st);
  if (length > 0)
    TEST_COMPARE (st.st_size, out_skipped + length);
  else
    {
      /* If we did not write anything, we also did not add any
         padding.  */
      TEST_COMPARE (st.st_size, 0);
      return;
    }

  xlseek (outfd, 0, SEEK_SET);
  char *bytes = xmalloc (st.st_size);
  TEST_COMPARE (read (outfd, bytes, st.st_size), st.st_size);
  for (int i = 0; i < out_skipped; ++i)
    TEST_COMPARE (bytes[i], 0);
  TEST_VERIFY (memcmp (bytes + out_skipped, random_data + in_skipped,
                       length) == 0);
  free (bytes);
}

/* Test that a short input file results in a shortened copy.  */
static void
short_copy (void)
{
  if (current_size == 0)
    /* Nothing to shorten.  */
    return;

  /* Two subtests, one with offset 0 and current_size - 1 bytes, and
     another one with current_size bytes, but offset 1.  */
  for (int shift = 0; shift < 2; ++shift)
    {
      if (test_verbose > 0)
        printf ("info:   shift=%d\n", shift);
      xftruncate (infd, 0);
      xlseek (infd, 0, SEEK_SET);
      xwrite (infd, random_data, current_size - !shift);

      if (do_inoff)
        {
          inoff = shift;
          xlseek (infd, 2, SEEK_SET);
        }
      else
        {
          inoff = 3;
          xlseek (infd, shift, SEEK_SET);
        }
      ftruncate (outfd, 0);
      xlseek (outfd, 0, SEEK_SET);
      outoff = 0;

      /* First call copies current_size - 1 bytes.  */
      TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
                                     current_size, 0), current_size - 1);
      char *buffer = xmalloc (current_size);
      TEST_COMPARE (pread64 (outfd, buffer, current_size, 0),
                    current_size - 1);
      TEST_VERIFY (memcmp (buffer, random_data + shift, current_size - 1)
                   == 0);
      free (buffer);

      if (do_inoff)
        {
          TEST_COMPARE (inoff, current_size - 1 + shift);
          TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
        }
      else
        TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
      if (do_outoff)
        {
          TEST_COMPARE (outoff, current_size - 1);
          TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
        }
      else
        TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);

      /* First call copies zero bytes.  */
      TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
                                     current_size, 0), 0);
      /* And the offsets are unchanged.  */
      if (do_inoff)
        {
          TEST_COMPARE (inoff, current_size - 1 + shift);
          TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
        }
      else
        TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
      if (do_outoff)
        {
          TEST_COMPARE (outoff, current_size - 1);
          TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
        }
      else
        TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);
    }
}

/* A named test function.  */
struct test_case
{
  const char *name;
  void (*func) (void);
  bool sizes; /* If true, call the test with different current_size values.  */
};

/* The available test cases.  */
static struct test_case tests[] =
  {
    { "simple_file_copy", simple_file_copy, .sizes = true },
    { "short_copy", short_copy, .sizes = true },
  };

static int
do_test (void)
{
  for (unsigned char *p = random_data; p < array_end (random_data); ++p)
    *p = rand () >> 24;

  infd = create_temp_file ("tst-copy_file_range-in-", &infile);
  outfd = create_temp_file ("tst-copy_file_range-out-", &outfile);
  {
    ssize_t ret = copy_file_range (infd, NULL, outfd, NULL, 0, 0);
    if (ret != 0)
      {
        if (errno == ENOSYS)
          FAIL_UNSUPPORTED ("copy_file_range is not support on this system");
        FAIL_EXIT1 ("copy_file_range probing call: %m");
      }
  }
  xclose (infd);
  xclose (outfd);

  for (do_inoff = 0; do_inoff < 2; ++do_inoff)
    for (do_outoff = 0; do_outoff < 2; ++do_outoff)
      for (struct test_case *test = tests; test < array_end (tests); ++test)
        for (const int *size = typical_sizes;
             size < array_end (typical_sizes); ++size)
          {
            current_size = *size;
            if (test_verbose > 0)
              printf ("info: %s do_inoff=%d do_outoff=%d current_size=%d\n",
                      test->name, do_inoff, do_outoff, current_size);

            inoff = 0;
            if (do_inoff)
              pinoff = &inoff;
            else
              pinoff = NULL;
            outoff = 0;
            if (do_outoff)
              poutoff = &outoff;
            else
              poutoff = NULL;

            infd = xopen (infile, O_RDWR | O_LARGEFILE, 0);
            xftruncate (infd, 0);
            outfd = xopen (outfile, O_RDWR | O_LARGEFILE, 0);
            xftruncate (outfd, 0);

            test->func ();

            xclose (infd);
            xclose (outfd);

            if (!test->sizes)
              /* Skip the other sizes unless they have been
                 requested.  */
              break;
          }

  free (infile);
  free (outfile);

  return 0;
}

#include <support/test-driver.c>