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authorJörg Frings-Fürst <debian@jff.email>2022-01-08 11:51:07 +0100
committerJörg Frings-Fürst <debian@jff.email>2022-01-08 11:51:07 +0100
commitbe8efac78d067c138ad8dda03df4336e73f94887 (patch)
tree5f5254a628ba0ef72065b93d949d1c985742ea8e /tests/test-fcntl.c
parent7b65dbd4ebade81d504cfe5e681292a58ad1fdf0 (diff)
New upstream version 1.0upstream/1.0
Diffstat (limited to 'tests/test-fcntl.c')
-rw-r--r--tests/test-fcntl.c435
1 files changed, 435 insertions, 0 deletions
diff --git a/tests/test-fcntl.c b/tests/test-fcntl.c
new file mode 100644
index 00000000..d4889a01
--- /dev/null
+++ b/tests/test-fcntl.c
@@ -0,0 +1,435 @@
+/* Test of fcntl(2).
+ Copyright (C) 2009-2022 Free Software Foundation, Inc.
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>. */
+
+/* Written by Eric Blake <ebb9@byu.net>, 2009. */
+
+#include <config.h>
+
+/* Specification. */
+#include <fcntl.h>
+
+#include "signature.h"
+SIGNATURE_CHECK (fcntl, int, (int, int, ...));
+
+/* Helpers. */
+#include <errno.h>
+#include <stdarg.h>
+#include <stdbool.h>
+#include <unistd.h>
+
+#if defined _WIN32 && ! defined __CYGWIN__
+/* Get declarations of the native Windows API functions. */
+# define WIN32_LEAN_AND_MEAN
+# include <windows.h>
+/* Get _get_osfhandle. */
+# if GNULIB_MSVC_NOTHROW
+# include "msvc-nothrow.h"
+# else
+# include <io.h>
+# endif
+#endif
+
+#include "binary-io.h"
+#include "macros.h"
+
+#if !O_BINARY
+# define set_binary_mode(f,m) zero ()
+static int zero (void) { return 0; }
+#endif
+
+/* Return true if FD is open. */
+static bool
+is_open (int fd)
+{
+#if defined _WIN32 && ! defined __CYGWIN__
+ /* On native Windows, the initial state of unassigned standard file
+ descriptors is that they are open but point to an
+ INVALID_HANDLE_VALUE, and there is no fcntl. */
+ return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
+#else
+# ifndef F_GETFL
+# error Please port fcntl to your platform
+# endif
+ return 0 <= fcntl (fd, F_GETFL);
+#endif
+}
+
+/* Return true if FD is open and inheritable across exec/spawn. */
+static bool
+is_inheritable (int fd)
+{
+#if defined _WIN32 && ! defined __CYGWIN__
+ /* On native Windows, the initial state of unassigned standard file
+ descriptors is that they are open but point to an
+ INVALID_HANDLE_VALUE, and there is no fcntl. */
+ HANDLE h = (HANDLE) _get_osfhandle (fd);
+ DWORD flags;
+ if (h == INVALID_HANDLE_VALUE || GetHandleInformation (h, &flags) == 0)
+ return false;
+ return (flags & HANDLE_FLAG_INHERIT) != 0;
+#else
+# ifndef F_GETFD
+# error Please port fcntl to your platform
+# endif
+ int i = fcntl (fd, F_GETFD);
+ return 0 <= i && (i & FD_CLOEXEC) == 0;
+#endif
+}
+
+/* Return non-zero if FD is open in the given MODE, which is either
+ O_TEXT or O_BINARY. */
+static bool
+is_mode (int fd, int mode)
+{
+ int value = set_binary_mode (fd, O_BINARY);
+ set_binary_mode (fd, value);
+ return mode == value;
+}
+
+/* Since native fcntl can have more supported operations than our
+ replacement is aware of, and since various operations assign
+ different types to the vararg argument, a wrapper around fcntl must
+ be able to pass a vararg of unknown type on through to the original
+ fcntl. Make sure that this works properly: func1 behaves like the
+ original fcntl interpreting the vararg as an int or a pointer to a
+ struct, and func2 behaves like rpl_fcntl that doesn't know what
+ type to forward. */
+struct dummy_struct
+{
+ long filler;
+ int value;
+};
+static int
+func1 (int a, ...)
+{
+ va_list arg;
+ int i;
+ va_start (arg, a);
+ if (a < 4)
+ i = va_arg (arg, int);
+ else
+ {
+ struct dummy_struct *s = va_arg (arg, struct dummy_struct *);
+ i = s->value;
+ }
+ va_end (arg);
+ return i;
+}
+static int
+func2 (int a, ...)
+{
+ va_list arg;
+ void *p;
+ va_start (arg, a);
+ p = va_arg (arg, void *);
+ va_end (arg);
+ return func1 (a, p);
+}
+
+/* Ensure that all supported fcntl actions are distinct, and
+ usable in preprocessor expressions. */
+static void
+check_flags (void)
+{
+ switch (0)
+ {
+ case F_DUPFD:
+#if F_DUPFD
+#endif
+
+ case F_DUPFD_CLOEXEC:
+#if F_DUPFD_CLOEXEC
+#endif
+
+ case F_GETFD:
+#if F_GETFD
+#endif
+
+#ifdef F_SETFD
+ case F_SETFD:
+# if F_SETFD
+# endif
+#endif
+
+#ifdef F_GETFL
+ case F_GETFL:
+# if F_GETFL
+# endif
+#endif
+
+#ifdef F_SETFL
+ case F_SETFL:
+# if F_SETFL
+# endif
+#endif
+
+#ifdef F_GETOWN
+ case F_GETOWN:
+# if F_GETOWN
+# endif
+#endif
+
+#ifdef F_SETOWN
+ case F_SETOWN:
+# if F_SETOWN
+# endif
+#endif
+
+#ifdef F_GETLK
+ case F_GETLK:
+# if F_GETLK
+# endif
+#endif
+
+#ifdef F_SETLK
+ case F_SETLK:
+# if F_SETLK
+# endif
+#endif
+
+#ifdef F_SETLKW
+ case F_SETLKW:
+# if F_SETLKW
+# endif
+#endif
+
+ default:
+ ;
+ }
+}
+
+int
+main (int argc, char *argv[])
+{
+ if (argc > 1)
+ /* child process */
+ return (is_open (10) ? 42 : 0);
+
+ const char *file = "test-fcntl.tmp";
+ int fd;
+ int bad_fd = getdtablesize ();
+
+ /* Sanity check that rpl_fcntl is likely to work. */
+ ASSERT (func2 (1, 2) == 2);
+ ASSERT (func2 (2, -2) == -2);
+ ASSERT (func2 (3, 0x80000000) == 0x80000000);
+ {
+ struct dummy_struct s = { 0L, 4 };
+ ASSERT (func2 (4, &s) == 4);
+ }
+ check_flags ();
+
+ /* Assume std descriptors were provided by invoker, and ignore fds
+ that might have been inherited. */
+ fd = creat (file, 0600);
+ ASSERT (STDERR_FILENO < fd);
+ close (fd + 1);
+ close (fd + 2);
+
+ /* For F_DUPFD*, the source must be valid. */
+ errno = 0;
+ ASSERT (fcntl (-1, F_DUPFD, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_DUPFD, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_DUPFD, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (-1, F_DUPFD_CLOEXEC, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_DUPFD_CLOEXEC, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_DUPFD_CLOEXEC, 0) == -1);
+ ASSERT (errno == EBADF);
+
+ /* For F_DUPFD*, the destination must be valid. */
+ errno = 0;
+ ASSERT (fcntl (fd, F_DUPFD, -1) == -1);
+ ASSERT (errno == EINVAL);
+ errno = 0;
+ ASSERT (fcntl (fd, F_DUPFD, bad_fd) == -1);
+ ASSERT (errno == EINVAL);
+ errno = 0;
+ ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, -1) == -1);
+ ASSERT (errno == EINVAL);
+ errno = 0;
+ ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, bad_fd) == -1);
+ ASSERT (errno == EINVAL
+ || errno == EMFILE /* WSL */);
+
+ /* For F_DUPFD*, check for correct inheritance, as well as
+ preservation of text vs. binary. */
+ set_binary_mode (fd, O_BINARY);
+ ASSERT (is_open (fd));
+ ASSERT (!is_open (fd + 1));
+ ASSERT (!is_open (fd + 2));
+ ASSERT (is_inheritable (fd));
+ ASSERT (is_mode (fd, O_BINARY));
+
+ ASSERT (fcntl (fd, F_DUPFD, fd) == fd + 1);
+ ASSERT (is_open (fd));
+ ASSERT (is_open (fd + 1));
+ ASSERT (!is_open (fd + 2));
+ ASSERT (is_inheritable (fd + 1));
+ ASSERT (is_mode (fd, O_BINARY));
+ ASSERT (is_mode (fd + 1, O_BINARY));
+ ASSERT (close (fd + 1) == 0);
+
+ ASSERT (fcntl (fd, F_DUPFD_CLOEXEC, fd + 2) == fd + 2);
+ ASSERT (is_open (fd));
+ ASSERT (!is_open (fd + 1));
+ ASSERT (is_open (fd + 2));
+ ASSERT (is_inheritable (fd));
+ ASSERT (!is_inheritable (fd + 2));
+ ASSERT (is_mode (fd, O_BINARY));
+ ASSERT (is_mode (fd + 2, O_BINARY));
+ ASSERT (close (fd) == 0);
+
+ set_binary_mode (fd + 2, O_TEXT);
+ ASSERT (fcntl (fd + 2, F_DUPFD, fd + 1) == fd + 1);
+ ASSERT (!is_open (fd));
+ ASSERT (is_open (fd + 1));
+ ASSERT (is_open (fd + 2));
+ ASSERT (is_inheritable (fd + 1));
+ ASSERT (!is_inheritable (fd + 2));
+ ASSERT (is_mode (fd + 1, O_TEXT));
+ ASSERT (is_mode (fd + 2, O_TEXT));
+ ASSERT (close (fd + 1) == 0);
+
+ ASSERT (fcntl (fd + 2, F_DUPFD_CLOEXEC, 0) == fd);
+ ASSERT (is_open (fd));
+ ASSERT (!is_open (fd + 1));
+ ASSERT (is_open (fd + 2));
+ ASSERT (!is_inheritable (fd));
+ ASSERT (!is_inheritable (fd + 2));
+ ASSERT (is_mode (fd, O_TEXT));
+ ASSERT (is_mode (fd + 2, O_TEXT));
+ ASSERT (close (fd + 2) == 0);
+
+ /* Test F_GETFD on invalid file descriptors. */
+ errno = 0;
+ ASSERT (fcntl (-1, F_GETFD) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_GETFD) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_GETFD) == -1);
+ ASSERT (errno == EBADF);
+
+ /* Test F_GETFD, the FD_CLOEXEC bit. */
+ {
+ int result = fcntl (fd, F_GETFD);
+ ASSERT (0 <= result);
+ ASSERT ((result & FD_CLOEXEC) == FD_CLOEXEC);
+ ASSERT (dup (fd) == fd + 1);
+ result = fcntl (fd + 1, F_GETFD);
+ ASSERT (0 <= result);
+ ASSERT ((result & FD_CLOEXEC) == 0);
+ ASSERT (close (fd + 1) == 0);
+ }
+
+#ifdef F_SETFD
+ /* Test F_SETFD on invalid file descriptors. */
+ errno = 0;
+ ASSERT (fcntl (-1, F_SETFD, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_SETFD, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_SETFD, 0) == -1);
+ ASSERT (errno == EBADF);
+#endif
+
+#ifdef F_GETFL
+ /* Test F_GETFL on invalid file descriptors. */
+ errno = 0;
+ ASSERT (fcntl (-1, F_GETFL) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_GETFL) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_GETFL) == -1);
+ ASSERT (errno == EBADF);
+#endif
+
+#ifdef F_SETFL
+ /* Test F_SETFL on invalid file descriptors. */
+ errno = 0;
+ ASSERT (fcntl (-1, F_SETFL, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_SETFL, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_SETFL, 0) == -1);
+ ASSERT (errno == EBADF);
+#endif
+
+#ifdef F_GETOWN
+ /* Test F_GETOWN on invalid file descriptors. */
+ errno = 0;
+ ASSERT (fcntl (-1, F_GETOWN) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_GETOWN) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_GETOWN) == -1);
+ ASSERT (errno == EBADF);
+#endif
+
+#ifdef F_SETOWN
+ /* Test F_SETFL on invalid file descriptors. */
+ errno = 0;
+ ASSERT (fcntl (-1, F_SETOWN, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (fd + 1, F_SETOWN, 0) == -1);
+ ASSERT (errno == EBADF);
+ errno = 0;
+ ASSERT (fcntl (bad_fd, F_SETOWN, 0) == -1);
+ ASSERT (errno == EBADF);
+#endif
+
+ /* Cleanup. */
+ ASSERT (close (fd) == 0);
+ ASSERT (unlink (file) == 0);
+
+ /* Close file descriptors that may have been inherited from the parent
+ process and that would cause failures below.
+ Such file descriptors have been seen:
+ - with GNU make, when invoked as 'make -j N' with j > 1,
+ - in some versions of the KDE desktop environment,
+ - on NetBSD,
+ - in MacPorts with the "trace mode" enabled.
+ */
+ (void) close (10);
+
+ /* Test whether F_DUPFD_CLOEXEC is effective. */
+ ASSERT (fcntl (1, F_DUPFD_CLOEXEC, 10) >= 0);
+#if defined _WIN32 && !defined __CYGWIN__
+ return _execl ("./test-fcntl", "./test-fcntl", "child", NULL);
+#else
+ return execl ("./test-fcntl", "./test-fcntl", "child", NULL);
+#endif
+}