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/* Test the read() function.
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Copyright (C) 2011-2017 Free Software Foundation, Inc.
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program 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
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <unistd.h>
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#include "signature.h"
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SIGNATURE_CHECK (read, ssize_t, (int, void *, size_t));
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#include "macros.h"
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int
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main (void)
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{
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const char *filename = "test-read.tmp";
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int fd;
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/* Create a file with a simple contents. */
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fd = open (filename, O_CREAT | O_WRONLY, 0600);
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ASSERT (fd >= 0);
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ASSERT (write (fd, "Hello World", 11) == 11);
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ASSERT (close (fd) == 0);
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/* Read from the middle of the file. */
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fd = open (filename, O_RDONLY);
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ASSERT (fd >= 0);
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ASSERT (lseek (fd, 6, SEEK_SET) == 6);
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{
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char buf[10];
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ssize_t ret = read (fd, buf, 10);
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ASSERT (ret == 5);
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ASSERT (memcmp (buf, "World", 5) == 0);
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}
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ASSERT (close (fd) == 0);
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/* Test behaviour for invalid file descriptors. */
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{
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char byte;
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errno = 0;
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ASSERT (read (-1, &byte, 1) == -1);
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ASSERT (errno == EBADF);
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}
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{
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char byte;
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close (99);
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errno = 0;
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ASSERT (read (99, &byte, 1) == -1);
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ASSERT (errno == EBADF);
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}
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/* Clean up. */
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unlink (filename);
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return 0;
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}
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