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/* Test that dup_safer leaves standard fds alone.
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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 <fcntl.h>
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#include <errno.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <unistd.h>
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#include "binary-io.h"
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#include "cloexec.h"
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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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#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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/* This test intentionally closes stderr. So, we arrange to have fd 10
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(outside the range of interesting fd's during the test) set up to
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duplicate the original stderr. */
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#define BACKUP_STDERR_FILENO 10
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#define ASSERT_STREAM myerr
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#include "macros.h"
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static FILE *myerr;
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/* Return true if FD is open. */
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static bool
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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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/* Return true if FD is open and inheritable across exec/spawn. */
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static bool
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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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/* Return true 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 bool
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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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#define witness "test-dup-safer.txt"
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int
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main (void)
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{
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int i;
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int fd;
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int bad_fd = getdtablesize ();
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/* We close fd 2 later, so save it in fd 10. */
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if (dup2 (STDERR_FILENO, BACKUP_STDERR_FILENO) != BACKUP_STDERR_FILENO
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|| (myerr = fdopen (BACKUP_STDERR_FILENO, "w")) == NULL)
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return 2;
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/* Create file for later checks. */
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fd = creat (witness, 0600);
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ASSERT (STDERR_FILENO < fd);
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/* Four iterations, with progressively more standard descriptors
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closed. */
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for (i = -1; i <= STDERR_FILENO; i++)
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{
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if (0 <= i)
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ASSERT (close (i) == 0);
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/* Detect errors. */
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errno = 0;
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ASSERT (dup (-1) == -1);
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ASSERT (errno == EBADF);
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errno = 0;
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ASSERT (dup (bad_fd) == -1);
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ASSERT (errno == EBADF);
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close (fd + 1);
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errno = 0;
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ASSERT (dup (fd + 1) == -1);
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ASSERT (errno == EBADF);
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/* Preserve text vs. binary. */
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setmode (fd, O_BINARY);
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ASSERT (dup (fd) == fd + 1);
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ASSERT (is_open (fd + 1));
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ASSERT (is_inheritable (fd + 1));
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ASSERT (is_mode (fd + 1, O_BINARY));
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ASSERT (close (fd + 1) == 0);
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setmode (fd, O_TEXT);
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ASSERT (dup (fd) == fd + 1);
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ASSERT (is_open (fd + 1));
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ASSERT (is_inheritable (fd + 1));
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ASSERT (is_mode (fd + 1, O_TEXT));
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/* Create cloexec copy. */
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ASSERT (close (fd + 1) == 0);
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ASSERT (fd_safer_flag (dup_cloexec (fd), O_CLOEXEC) == fd + 1);
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ASSERT (set_cloexec_flag (fd + 1, true) == 0);
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ASSERT (is_open (fd + 1));
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ASSERT (!is_inheritable (fd + 1));
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ASSERT (close (fd) == 0);
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/* dup always creates inheritable copies. Also, check that
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earliest slot past std fds is used. */
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ASSERT (dup (fd + 1) == fd);
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ASSERT (is_open (fd));
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ASSERT (is_inheritable (fd));
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ASSERT (close (fd + 1) == 0);
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}
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/* Cleanup. */
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ASSERT (close (fd) == 0);
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ASSERT (unlink (witness) == 0);
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return 0;
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}
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