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84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/* Common definitions for pread and pwrite.
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Copyright (C) 2016-2020 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 <errno.h>
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#include <error.h>
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#include <string.h>
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#include <unistd.h>
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#include <sys/stat.h>
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static void do_prepare (void);
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#define PREPARE(argc, argv) do_prepare ()
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static int do_test (void);
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#define TEST_FUNCTION do_test ()
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/* This defines the `main' function and some more. */
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#include <test-skeleton.c>
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/* These are for the temporary file we generate. */
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static char *name;
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static int fd;
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static void
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do_prepare (void)
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{
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fd = create_temp_file ("tst-preadwrite.", &name);
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if (fd == -1)
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error (EXIT_FAILURE, errno, "cannot create temporary file");
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}
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static ssize_t
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do_test_with_offset (off_t offset)
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{
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char buf[1000];
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char res[1000];
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int i;
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ssize_t ret;
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memset (buf, '\0', sizeof (buf));
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memset (res, '\xff', sizeof (res));
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if (write (fd, buf, sizeof (buf)) != sizeof (buf))
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error (EXIT_FAILURE, errno, "during write");
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for (i = 100; i < 200; ++i)
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buf[i] = i;
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ret = pwrite (fd, buf + 100, 100, offset + 100);
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if (ret == -1)
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error (EXIT_FAILURE, errno, "during pwrite");
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for (i = 450; i < 600; ++i)
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buf[i] = i;
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ret = pwrite (fd, buf + 450, 150, offset + 450);
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if (ret == -1)
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error (EXIT_FAILURE, errno, "during pwrite");
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ret = pread (fd, res, sizeof (buf) - 50, offset + 50);
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if (ret == -1)
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error (EXIT_FAILURE, errno, "during pread");
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if (memcmp (buf + 50, res, ret) != 0)
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{
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printf ("error: read of pread != write of pwrite\n");
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return -1;
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}
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return ret;
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}
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