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299 lines
8.4 KiB
C
299 lines
8.4 KiB
C
/* Tests for copy_file_range.
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Copyright (C) 2017-2025 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <array_length.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <support/check.h>
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#include <support/support.h>
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#include <support/temp_file.h>
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#include <support/test-driver.h>
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#include <support/xunistd.h>
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/* Boolean flags which indicate whether to use pointers with explicit
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output flags. */
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static int do_inoff;
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static int do_outoff;
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/* Name and descriptors of the input files. Files are truncated and
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reopened (with O_RDWR) between tests. */
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static char *infile;
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static int infd;
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static char *outfile;
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static int outfd;
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/* Input and output offsets. Set according to do_inoff and do_outoff
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before the test. The offsets themselves are always set to
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zero. */
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static off64_t inoff;
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static off64_t *pinoff;
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static off64_t outoff;
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static off64_t *poutoff;
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/* These are a collection of copy sizes used in tests. */
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enum { maximum_size = 99999 };
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static const int typical_sizes[] =
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{ 0, 1, 2, 3, 1024, 2048, 4096, 8191, 8192, 8193, maximum_size };
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/* The random contents of this array can be used as a pattern to check
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for correct write operations. */
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static unsigned char random_data[maximum_size];
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/* The size chosen by the test harness. */
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static int current_size;
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/* Perform a copy of a file. */
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static void
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simple_file_copy (void)
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{
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xwrite (infd, random_data, current_size);
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int length;
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int in_skipped; /* Expected skipped bytes in input. */
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if (do_inoff)
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{
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xlseek (infd, 1, SEEK_SET);
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inoff = 2;
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length = current_size - 3;
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in_skipped = 2;
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}
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else
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{
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xlseek (infd, 3, SEEK_SET);
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length = current_size - 5;
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in_skipped = 3;
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}
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int out_skipped; /* Expected skipped bytes before the written data. */
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if (do_outoff)
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{
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xlseek (outfd, 4, SEEK_SET);
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outoff = 5;
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out_skipped = 5;
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}
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else
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{
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xlseek (outfd, 6, SEEK_SET);
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length = current_size - 6;
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out_skipped = 6;
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}
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if (length < 0)
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length = 0;
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TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
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length, 0), length);
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if (do_inoff)
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{
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TEST_COMPARE (inoff, 2 + length);
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TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 1);
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}
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else
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TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 3 + length);
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if (do_outoff)
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{
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TEST_COMPARE (outoff, 5 + length);
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TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 4);
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}
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else
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TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 6 + length);
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struct stat64 st;
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xfstat64 (outfd, &st);
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if (length > 0)
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TEST_COMPARE (st.st_size, out_skipped + length);
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else
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{
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/* If we did not write anything, we also did not add any
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padding. */
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TEST_COMPARE (st.st_size, 0);
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return;
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}
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xlseek (outfd, 0, SEEK_SET);
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char *bytes = xmalloc (st.st_size);
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TEST_COMPARE (read (outfd, bytes, st.st_size), st.st_size);
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for (int i = 0; i < out_skipped; ++i)
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TEST_COMPARE (bytes[i], 0);
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TEST_VERIFY (memcmp (bytes + out_skipped, random_data + in_skipped,
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length) == 0);
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free (bytes);
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}
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/* Test that a short input file results in a shortened copy. */
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static void
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short_copy (void)
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{
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if (current_size == 0)
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/* Nothing to shorten. */
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return;
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/* Two subtests, one with offset 0 and current_size - 1 bytes, and
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another one with current_size bytes, but offset 1. */
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for (int shift = 0; shift < 2; ++shift)
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{
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if (test_verbose > 0)
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printf ("info: shift=%d\n", shift);
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xftruncate (infd, 0);
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xlseek (infd, 0, SEEK_SET);
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xwrite (infd, random_data, current_size - !shift);
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if (do_inoff)
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{
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inoff = shift;
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xlseek (infd, 2, SEEK_SET);
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}
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else
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{
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inoff = 3;
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xlseek (infd, shift, SEEK_SET);
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}
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xftruncate (outfd, 0);
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xlseek (outfd, 0, SEEK_SET);
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outoff = 0;
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/* First call copies current_size - 1 bytes. */
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TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
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current_size, 0), current_size - 1);
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char *buffer = xmalloc (current_size);
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TEST_COMPARE (pread64 (outfd, buffer, current_size, 0),
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current_size - 1);
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TEST_VERIFY (memcmp (buffer, random_data + shift, current_size - 1)
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== 0);
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free (buffer);
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if (do_inoff)
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{
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TEST_COMPARE (inoff, current_size - 1 + shift);
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TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
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}
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else
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TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
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if (do_outoff)
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{
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TEST_COMPARE (outoff, current_size - 1);
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TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
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}
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else
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TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);
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/* First call copies zero bytes. */
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TEST_COMPARE (copy_file_range (infd, pinoff, outfd, poutoff,
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current_size, 0), 0);
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/* And the offsets are unchanged. */
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if (do_inoff)
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{
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TEST_COMPARE (inoff, current_size - 1 + shift);
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TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), 2);
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}
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else
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TEST_COMPARE (xlseek (infd, 0, SEEK_CUR), current_size - 1 + shift);
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if (do_outoff)
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{
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TEST_COMPARE (outoff, current_size - 1);
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TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), 0);
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}
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else
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TEST_COMPARE (xlseek (outfd, 0, SEEK_CUR), current_size - 1);
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}
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}
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/* A named test function. */
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struct test_case
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{
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const char *name;
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void (*func) (void);
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bool sizes; /* If true, call the test with different current_size values. */
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};
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/* The available test cases. */
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static struct test_case tests[] =
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{
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{ "simple_file_copy", simple_file_copy, .sizes = true },
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{ "short_copy", short_copy, .sizes = true },
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};
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static int
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do_test (void)
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{
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for (unsigned char *p = random_data; p < array_end (random_data); ++p)
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*p = rand () >> 24;
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infd = create_temp_file ("tst-copy_file_range-in-", &infile);
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outfd = create_temp_file ("tst-copy_file_range-out-", &outfile);
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{
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ssize_t ret = copy_file_range (infd, NULL, outfd, NULL, 0, 0);
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if (ret != 0)
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{
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if (errno == ENOSYS)
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FAIL_UNSUPPORTED ("copy_file_range is not support on this system");
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FAIL_EXIT1 ("copy_file_range probing call: %m");
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}
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}
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xclose (infd);
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xclose (outfd);
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for (do_inoff = 0; do_inoff < 2; ++do_inoff)
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for (do_outoff = 0; do_outoff < 2; ++do_outoff)
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for (struct test_case *test = tests; test < array_end (tests); ++test)
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for (const int *size = typical_sizes;
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size < array_end (typical_sizes); ++size)
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{
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current_size = *size;
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if (test_verbose > 0)
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printf ("info: %s do_inoff=%d do_outoff=%d current_size=%d\n",
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test->name, do_inoff, do_outoff, current_size);
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inoff = 0;
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if (do_inoff)
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pinoff = &inoff;
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else
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pinoff = NULL;
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outoff = 0;
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if (do_outoff)
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poutoff = &outoff;
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else
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poutoff = NULL;
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infd = xopen (infile, O_RDWR | O_LARGEFILE, 0);
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xftruncate (infd, 0);
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outfd = xopen (outfile, O_RDWR | O_LARGEFILE, 0);
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xftruncate (outfd, 0);
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test->func ();
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xclose (infd);
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xclose (outfd);
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if (!test->sizes)
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/* Skip the other sizes unless they have been
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requested. */
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break;
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}
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free (infile);
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free (outfile);
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return 0;
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}
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#include <support/test-driver.c>
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