152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
/* Test duplicating non-inheritable file descriptors.
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Copyright (C) 2009-2025 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 <https://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 "cloexec.h"
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#include <errno.h>
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#include <fcntl.h>
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#include <unistd.h>
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#if 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 "binary-io.h"
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#include "macros.h"
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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 __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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#if !O_BINARY
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# define set_binary_mode my_set_binary_mode
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static int
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set_binary_mode (_GL_UNUSED int fd, _GL_UNUSED int mode)
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{
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return 0;
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}
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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 = set_binary_mode (fd, O_BINARY);
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set_binary_mode (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-cloexec.tmp";
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int fd = creat (file, 0600);
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int fd2;
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int bad_fd = getdtablesize ();
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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_inheritable (fd));
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/* Normal use of set_cloexec_flag. */
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ASSERT (set_cloexec_flag (fd, true) == 0);
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#if !(defined _WIN32 && ! defined __CYGWIN__)
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ASSERT (!is_inheritable (fd));
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#endif
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ASSERT (set_cloexec_flag (fd, false) == 0);
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ASSERT (is_inheritable (fd));
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/* Normal use of dup_cloexec. */
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fd2 = dup_cloexec (fd);
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ASSERT (fd < fd2);
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ASSERT (!is_inheritable (fd2));
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ASSERT (close (fd) == 0);
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ASSERT (dup_cloexec (fd2) == fd);
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ASSERT (!is_inheritable (fd));
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ASSERT (close (fd2) == 0);
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/* On systems that distinguish between text and binary mode,
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dup_cloexec reuses the mode of the source. */
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set_binary_mode (fd, O_BINARY);
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ASSERT (is_mode (fd, O_BINARY));
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fd2 = dup_cloexec (fd);
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ASSERT (fd < fd2);
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ASSERT (is_mode (fd2, O_BINARY));
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ASSERT (close (fd2) == 0);
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set_binary_mode (fd, O_TEXT);
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ASSERT (is_mode (fd, O_TEXT));
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fd2 = dup_cloexec (fd);
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ASSERT (fd < fd2);
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ASSERT (is_mode (fd2, O_TEXT));
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ASSERT (close (fd2) == 0);
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/* Test error handling. */
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errno = 0;
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ASSERT (set_cloexec_flag (-1, false) == -1);
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ASSERT (errno == EBADF);
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errno = 0;
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ASSERT (set_cloexec_flag (bad_fd, false) == -1);
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ASSERT (errno == EBADF);
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errno = 0;
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ASSERT (set_cloexec_flag (fd2, false) == -1);
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ASSERT (errno == EBADF);
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errno = 0;
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ASSERT (dup_cloexec (-1) == -1);
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ASSERT (errno == EBADF);
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errno = 0;
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ASSERT (dup_cloexec (bad_fd) == -1);
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ASSERT (errno == EBADF);
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errno = 0;
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ASSERT (dup_cloexec (fd2) == -1);
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ASSERT (errno == EBADF);
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/* Clean up. */
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ASSERT (close (fd) == 0);
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ASSERT (unlink (file) == 0);
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return test_exit_status;
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}
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