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/* Test duplicating file descriptors.
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Copyright (C) 2009-2017 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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/* Written by Eric Blake <ebb9@byu.net>, 2009. */
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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 (dup2, int, (int, int));
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#include <errno.h>
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#include <fcntl.h>
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#if HAVE_SYS_RESOURCE_H
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# include <sys/resource.h>
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#endif
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#include "binary-io.h"
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#if GNULIB_TEST_CLOEXEC
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# include "cloexec.h"
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#endif
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* Get declarations of the native Windows API functions. */
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# define WIN32_LEAN_AND_MEAN
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# include <windows.h>
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/* Get _get_osfhandle. */
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# if GNULIB_MSVC_NOTHROW
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# include "msvc-nothrow.h"
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# else
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# include <io.h>
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# endif
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#endif
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#include "macros.h"
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/* Return non-zero if FD is open. */
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static int
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is_open (int fd)
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{
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* On native Windows, the initial state of unassigned standard file
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descriptors is that they are open but point to an
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INVALID_HANDLE_VALUE, and there is no fcntl. */
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return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
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#else
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# ifndef F_GETFL
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# error Please port fcntl to your platform
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# endif
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return 0 <= fcntl (fd, F_GETFL);
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#endif
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}
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#if GNULIB_TEST_CLOEXEC
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/* Return non-zero if FD is open and inheritable across exec/spawn. */
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static int
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is_inheritable (int fd)
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{
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# if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
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/* On native Windows, the initial state of unassigned standard file
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descriptors is that they are open but point to an
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INVALID_HANDLE_VALUE, and there is no fcntl. */
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HANDLE h = (HANDLE) _get_osfhandle (fd);
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DWORD flags;
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if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
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return 0;
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return (flags & HANDLE_FLAG_INHERIT) != 0;
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# else
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# ifndef F_GETFD
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# error Please port fcntl to your platform
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# endif
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int i = fcntl (fd, F_GETFD);
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return 0 <= i && (i & FD_CLOEXEC) == 0;
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# endif
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}
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#endif /* GNULIB_TEST_CLOEXEC */
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#if !O_BINARY
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# define setmode(f,m) zero ()
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static int zero (void) { return 0; }
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#endif
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/* Return non-zero if FD is open in the given MODE, which is either
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O_TEXT or O_BINARY. */
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static int
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is_mode (int fd, int mode)
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{
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int value = setmode (fd, O_BINARY);
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setmode (fd, value);
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return mode == value;
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}
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int
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main (void)
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{
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const char *file = "test-dup2.tmp";
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char buffer[1];
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int bad_fd = getdtablesize ();
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int fd = open (file, O_CREAT | O_TRUNC | O_RDWR, 0600);
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/* Assume std descriptors were provided by invoker. */
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ASSERT (STDERR_FILENO < fd);
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ASSERT (is_open (fd));
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/* Ignore any other fd's leaked into this process. */
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close (fd + 1);
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close (fd + 2);
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ASSERT (!is_open (fd + 1));
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ASSERT (!is_open (fd + 2));
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/* Assigning to self must be a no-op. */
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ASSERT (dup2 (fd, fd) == fd);
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ASSERT (is_open (fd));
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/* The source must be valid. */
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errno = 0;
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ASSERT (dup2 (-1, fd) == -1);
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ASSERT (errno == EBADF);
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close (99);
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errno = 0;
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ASSERT (dup2 (99, fd) == -1);
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ASSERT (errno == EBADF);
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errno = 0;
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ASSERT (dup2 (AT_FDCWD, fd) == -1);
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ASSERT (errno == EBADF);
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ASSERT (is_open (fd));
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/* If the source is not open, then the destination is unaffected. */
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errno = 0;
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ASSERT (dup2 (fd + 1, fd + 1) == -1);
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ASSERT (errno == EBADF);
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ASSERT (!is_open (fd + 1));
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errno = 0;
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ASSERT (dup2 (fd + 1, fd) == -1);
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ASSERT (errno == EBADF);
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ASSERT (is_open (fd));
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/* The destination must be valid. */
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errno = 0;
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ASSERT (dup2 (fd, -2) == -1);
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ASSERT (errno == EBADF);
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if (bad_fd > 256)
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{
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ASSERT (dup2 (fd, 255) == 255);
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ASSERT (dup2 (fd, 256) == 256);
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ASSERT (close (255) == 0);
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ASSERT (close (256) == 0);
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}
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ASSERT (dup2 (fd, bad_fd - 1) == bad_fd - 1);
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ASSERT (close (bad_fd - 1) == 0);
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errno = 0;
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ASSERT (dup2 (fd, bad_fd) == -1);
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ASSERT (errno == EBADF);
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/* Using dup2 can skip fds. */
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ASSERT (dup2 (fd, fd + 2) == fd + 2);
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ASSERT (is_open (fd));
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ASSERT (!is_open (fd + 1));
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ASSERT (is_open (fd + 2));
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/* Verify that dup2 closes the previous occupant of a fd. */
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ASSERT (open ("/dev/null", O_WRONLY, 0600) == fd + 1);
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ASSERT (dup2 (fd + 1, fd) == fd);
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ASSERT (close (fd + 1) == 0);
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ASSERT (write (fd, "1", 1) == 1);
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ASSERT (dup2 (fd + 2, fd) == fd);
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ASSERT (lseek (fd, 0, SEEK_END) == 0);
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ASSERT (write (fd + 2, "2", 1) == 1);
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ASSERT (lseek (fd, 0, SEEK_SET) == 0);
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ASSERT (read (fd, buffer, 1) == 1);
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ASSERT (*buffer == '2');
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#if GNULIB_TEST_CLOEXEC
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/* Any new fd created by dup2 must not be cloexec. */
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ASSERT (close (fd + 2) == 0);
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ASSERT (dup_cloexec (fd) == fd + 1);
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ASSERT (!is_inheritable (fd + 1));
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ASSERT (dup2 (fd + 1, fd + 1) == fd + 1);
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ASSERT (!is_inheritable (fd + 1));
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ASSERT (dup2 (fd + 1, fd + 2) == fd + 2);
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ASSERT (!is_inheritable (fd + 1));
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ASSERT (is_inheritable (fd + 2));
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errno = 0;
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ASSERT (dup2 (fd + 1, -1) == -1);
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ASSERT (errno == EBADF);
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ASSERT (!is_inheritable (fd + 1));
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#endif
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/* On systems that distinguish between text and binary mode, dup2
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reuses the mode of the source. */
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setmode (fd, O_BINARY);
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ASSERT (is_mode (fd, O_BINARY));
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ASSERT (dup2 (fd, fd + 1) == fd + 1);
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ASSERT (is_mode (fd + 1, O_BINARY));
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setmode (fd, O_TEXT);
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ASSERT (is_mode (fd, O_TEXT));
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ASSERT (dup2 (fd, fd + 1) == fd + 1);
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ASSERT (is_mode (fd + 1, O_TEXT));
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/* Clean up. */
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ASSERT (close (fd + 2) == 0);
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ASSERT (close (fd + 1) == 0);
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ASSERT (close (fd) == 0);
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ASSERT (unlink (file) == 0);
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return 0;
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}
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