bpo-26836: Add os.memfd_create() (#13567)
* bpo-26836: Add os.memfd_create() * Use the glibc wrapper for memfd_create() Co-Authored-By: Christian Heimes <christian@python.org> * Fix deletions caused by autoreconf. * Use MFD_CLOEXEC as the default value for *flags*. * Add memset_s to configure.ac. * Revert memset_s changes. * Apply the requested changes. * Tweak the docs.
This commit is contained in:
Zackery Spytz
Christian Heimes
parent
0c2f930564
commit
43fdbd2729
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@ -2982,6 +2982,44 @@ features:
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Added support for :class:`bytes` paths.
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.. function:: memfd_create(name[, flags=os.MFD_CLOEXEC])
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Create an anonymous file and return a file descriptor that refers to it.
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*flags* must be one of the ``os.MFD_*`` constants available on the system
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(or a bitwise ORed combination of them). By default, the new file
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descriptor is :ref:`non-inheritable <fd_inheritance>`.
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.. availability:: Linux 3.17 or newer with glibc 2.27 or newer.
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.. versionadded:: 3.8
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.. data:: MFD_CLOEXEC
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MFD_ALLOW_SEALING
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MFD_HUGETLB
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MFD_HUGE_SHIFT
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MFD_HUGE_MASK
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MFD_HUGE_64KB
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MFD_HUGE_512KB
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MFD_HUGE_1MB
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MFD_HUGE_2MB
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MFD_HUGE_8MB
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MFD_HUGE_16MB
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MFD_HUGE_32MB
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MFD_HUGE_256MB
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MFD_HUGE_512MB
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MFD_HUGE_1GB
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MFD_HUGE_2GB
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MFD_HUGE_16GB
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These flags can be passed to :func:`memfd_create`.
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.. availability:: Linux 3.17 or newer with glibc 2.27 or newer. The
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``MFD_HUGE*`` flags are only available since Linux 4.14.
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.. versionadded:: 3.8
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Linux extended attributes
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~~~~~~~~~~~~~~~~~~~~~~~~~
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@ -486,6 +486,10 @@ Added new function :func:`~os.add_dll_directory` on Windows for providing
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additional search paths for native dependencies when importing extension
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modules or loading DLLs using :mod:`ctypes`.
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A new :func:`os.memfd_create` function was added to wrap the
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``memfd_create()`` syscall.
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(Contributed by Zackery Spytz and Christian Heimes in :issue:`26836`.)
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os.path
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-------
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@ -3122,6 +3122,22 @@ class TermsizeTests(unittest.TestCase):
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self.assertEqual(expected, actual)
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@unittest.skipUnless(hasattr(os, 'memfd_create'), 'requires os.memfd_create')
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class MemfdCreateTests(unittest.TestCase):
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def test_memfd_create(self):
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fd = os.memfd_create("Hi", os.MFD_CLOEXEC)
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self.assertNotEqual(fd, -1)
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self.addCleanup(os.close, fd)
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self.assertFalse(os.get_inheritable(fd))
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with open(fd, "wb", closefd=False) as f:
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f.write(b'memfd_create')
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self.assertEqual(f.tell(), 12)
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fd2 = os.memfd_create("Hi")
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self.addCleanup(os.close, fd2)
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self.assertFalse(os.get_inheritable(fd2))
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class OSErrorTests(unittest.TestCase):
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def setUp(self):
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class Str(str):
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@ -0,0 +1 @@
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Add :func:`os.memfd_create`.
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@ -7343,6 +7343,61 @@ exit:
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return return_value;
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}
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#if defined(HAVE_MEMFD_CREATE)
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PyDoc_STRVAR(os_memfd_create__doc__,
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"memfd_create($module, /, name, flags=MFD_CLOEXEC)\n"
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"--\n"
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"\n");
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#define OS_MEMFD_CREATE_METHODDEF \
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{"memfd_create", (PyCFunction)(void(*)(void))os_memfd_create, METH_FASTCALL|METH_KEYWORDS, os_memfd_create__doc__},
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static PyObject *
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os_memfd_create_impl(PyObject *module, PyObject *name, unsigned int flags);
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static PyObject *
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os_memfd_create(PyObject *module, PyObject *const *args, Py_ssize_t nargs, PyObject *kwnames)
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{
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PyObject *return_value = NULL;
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static const char * const _keywords[] = {"name", "flags", NULL};
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static _PyArg_Parser _parser = {NULL, _keywords, "memfd_create", 0};
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PyObject *argsbuf[2];
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Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 1;
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PyObject *name = NULL;
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unsigned int flags = MFD_CLOEXEC;
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args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 1, 2, 0, argsbuf);
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if (!args) {
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goto exit;
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}
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if (!PyUnicode_FSConverter(args[0], &name)) {
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goto exit;
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}
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if (!noptargs) {
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goto skip_optional_pos;
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}
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if (PyFloat_Check(args[1])) {
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PyErr_SetString(PyExc_TypeError,
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"integer argument expected, got float" );
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goto exit;
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}
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flags = (unsigned int)PyLong_AsUnsignedLongMask(args[1]);
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if (flags == (unsigned int)-1 && PyErr_Occurred()) {
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goto exit;
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}
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skip_optional_pos:
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return_value = os_memfd_create_impl(module, name, flags);
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exit:
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/* Cleanup for name */
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Py_XDECREF(name);
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return return_value;
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}
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#endif /* defined(HAVE_MEMFD_CREATE) */
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PyDoc_STRVAR(os_cpu_count__doc__,
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"cpu_count($module, /)\n"
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"--\n"
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@ -8549,6 +8604,10 @@ exit:
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#define OS_LISTXATTR_METHODDEF
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#endif /* !defined(OS_LISTXATTR_METHODDEF) */
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#ifndef OS_MEMFD_CREATE_METHODDEF
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#define OS_MEMFD_CREATE_METHODDEF
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#endif /* !defined(OS_MEMFD_CREATE_METHODDEF) */
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#ifndef OS_GET_HANDLE_INHERITABLE_METHODDEF
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#define OS_GET_HANDLE_INHERITABLE_METHODDEF
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#endif /* !defined(OS_GET_HANDLE_INHERITABLE_METHODDEF) */
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@ -8576,4 +8635,4 @@ exit:
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#ifndef OS__REMOVE_DLL_DIRECTORY_METHODDEF
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#define OS__REMOVE_DLL_DIRECTORY_METHODDEF
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#endif /* !defined(OS__REMOVE_DLL_DIRECTORY_METHODDEF) */
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/*[clinic end generated code: output=5ee9420fb2e7aa2c input=a9049054013a1b77]*/
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/*[clinic end generated code: output=855b81aafd05beed input=a9049054013a1b77]*/
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@ -389,6 +389,19 @@ extern char *ctermid_r(char *);
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#define HAVE_STRUCT_STAT_ST_FSTYPE 1
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#endif
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/* memfd_create is either defined in sys/mman.h or sys/memfd.h
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* linux/memfd.h defines additional flags
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*/
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifdef HAVE_SYS_MEMFD_H
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#include <sys/memfd.h>
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#endif
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#ifdef HAVE_LINUX_MEMFD_H
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#include <linux/memfd.h>
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#endif
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#ifdef _Py_MEMORY_SANITIZER
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# include <sanitizer/msan_interface.h>
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#endif
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@ -11897,6 +11910,31 @@ os_urandom_impl(PyObject *module, Py_ssize_t size)
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return bytes;
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}
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#ifdef HAVE_MEMFD_CREATE
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/*[clinic input]
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os.memfd_create
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name: FSConverter
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flags: unsigned_int(bitwise=True, c_default="MFD_CLOEXEC") = MFD_CLOEXEC
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[clinic start generated code]*/
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static PyObject *
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os_memfd_create_impl(PyObject *module, PyObject *name, unsigned int flags)
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/*[clinic end generated code: output=6681ede983bdb9a6 input=a42cfc199bcd56e9]*/
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{
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int fd;
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const char *bytes = PyBytes_AS_STRING(name);
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Py_BEGIN_ALLOW_THREADS
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fd = memfd_create(bytes, flags);
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Py_END_ALLOW_THREADS
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if (fd == -1) {
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return PyErr_SetFromErrno(PyExc_OSError);
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}
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return PyLong_FromLong(fd);
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}
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#endif
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/* Terminal size querying */
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static PyTypeObject* TerminalSizeType;
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@ -13554,6 +13592,7 @@ static PyMethodDef posix_methods[] = {
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OS_SCANDIR_METHODDEF
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OS_FSPATH_METHODDEF
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OS_GETRANDOM_METHODDEF
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OS_MEMFD_CREATE_METHODDEF
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#ifdef MS_WINDOWS
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OS__ADD_DLL_DIRECTORY_METHODDEF
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OS__REMOVE_DLL_DIRECTORY_METHODDEF
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@ -14003,6 +14042,27 @@ all_ins(PyObject *m)
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if (PyModule_AddIntMacro(m, GRND_RANDOM)) return -1;
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if (PyModule_AddIntMacro(m, GRND_NONBLOCK)) return -1;
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#endif
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#ifdef HAVE_MEMFD_CREATE
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if (PyModule_AddIntMacro(m, MFD_CLOEXEC)) return -1;
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if (PyModule_AddIntMacro(m, MFD_ALLOW_SEALING)) return -1;
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#ifdef MFD_HUGETLB
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if (PyModule_AddIntMacro(m, MFD_HUGETLB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_SHIFT)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_MASK)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_64KB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_512KB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_1MB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_2MB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_8MB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_16MB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_32MB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_256MB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_512MB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_1GB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_2GB)) return -1;
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if (PyModule_AddIntMacro(m, MFD_HUGE_16GB)) return -1;
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#endif
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#endif
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#if defined(__APPLE__)
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if (PyModule_AddIntConstant(m, "_COPYFILE_DATA", COPYFILE_DATA)) return -1;
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@ -14119,6 +14179,10 @@ static const char * const have_functions[] = {
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"HAVE_LUTIMES",
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#endif
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#ifdef HAVE_MEMFD_CREATE
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"HAVE_MEMFD_CREATE",
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#endif
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#ifdef HAVE_MKDIRAT
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"HAVE_MKDIRAT",
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#endif
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@ -55,7 +55,7 @@ dnl
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dnl See the "Since" comment for each macro you use to see what version
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dnl of the macros you require.
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m4_defun([PKG_PREREQ],
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[m4_define([PKG_MACROS_VERSION], [0.29.2])
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[m4_define([PKG_MACROS_VERSION], [0.29.1])
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m4_if(m4_version_compare(PKG_MACROS_VERSION, [$1]), -1,
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[m4_fatal([pkg.m4 version $1 or higher is required but ]PKG_MACROS_VERSION[ found])])
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])dnl PKG_PREREQ
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@ -156,7 +156,7 @@ AC_ARG_VAR([$1][_CFLAGS], [C compiler flags for $1, overriding pkg-config])dnl
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AC_ARG_VAR([$1][_LIBS], [linker flags for $1, overriding pkg-config])dnl
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pkg_failed=no
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AC_MSG_CHECKING([for $2])
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AC_MSG_CHECKING([for $1])
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_PKG_CONFIG([$1][_CFLAGS], [cflags], [$2])
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_PKG_CONFIG([$1][_LIBS], [libs], [$2])
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@ -166,11 +166,11 @@ and $1[]_LIBS to avoid the need to call pkg-config.
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See the pkg-config man page for more details.])
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if test $pkg_failed = yes; then
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AC_MSG_RESULT([no])
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AC_MSG_RESULT([no])
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_PKG_SHORT_ERRORS_SUPPORTED
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if test $_pkg_short_errors_supported = yes; then
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$1[]_PKG_ERRORS=`$PKG_CONFIG --short-errors --print-errors --cflags --libs "$2" 2>&1`
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else
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else
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$1[]_PKG_ERRORS=`$PKG_CONFIG --print-errors --cflags --libs "$2" 2>&1`
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fi
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# Put the nasty error message in config.log where it belongs
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@ -187,7 +187,7 @@ installed software in a non-standard prefix.
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_PKG_TEXT])[]dnl
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])
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elif test $pkg_failed = untried; then
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AC_MSG_RESULT([no])
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AC_MSG_RESULT([no])
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m4_default([$4], [AC_MSG_FAILURE(
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[The pkg-config script could not be found or is too old. Make sure it
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is in your PATH or set the PKG_CONFIG environment variable to the full
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@ -785,6 +785,7 @@ infodir
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docdir
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oldincludedir
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includedir
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runstatedir
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localstatedir
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sharedstatedir
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sysconfdir
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@ -897,6 +898,7 @@ datadir='${datarootdir}'
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sysconfdir='${prefix}/etc'
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sharedstatedir='${prefix}/com'
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localstatedir='${prefix}/var'
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runstatedir='${localstatedir}/run'
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includedir='${prefix}/include'
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oldincludedir='/usr/include'
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docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
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@ -1149,6 +1151,15 @@ do
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| -silent | --silent | --silen | --sile | --sil)
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silent=yes ;;
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-runstatedir | --runstatedir | --runstatedi | --runstated \
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| --runstate | --runstat | --runsta | --runst | --runs \
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| --run | --ru | --r)
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ac_prev=runstatedir ;;
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-runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
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| --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
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| --run=* | --ru=* | --r=*)
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runstatedir=$ac_optarg ;;
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-sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
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ac_prev=sbindir ;;
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-sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
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@ -1286,7 +1297,7 @@ fi
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for ac_var in exec_prefix prefix bindir sbindir libexecdir datarootdir \
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datadir sysconfdir sharedstatedir localstatedir includedir \
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oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
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libdir localedir mandir
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libdir localedir mandir runstatedir
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do
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eval ac_val=\$$ac_var
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# Remove trailing slashes.
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@ -1439,6 +1450,7 @@ Fine tuning of the installation directories:
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--sysconfdir=DIR read-only single-machine data [PREFIX/etc]
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--sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
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--localstatedir=DIR modifiable single-machine data [PREFIX/var]
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--runstatedir=DIR modifiable per-process data [LOCALSTATEDIR/run]
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--libdir=DIR object code libraries [EPREFIX/lib]
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--includedir=DIR C header files [PREFIX/include]
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--oldincludedir=DIR C header files for non-gcc [/usr/include]
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@ -7892,7 +7904,7 @@ sys/stat.h sys/syscall.h sys/sys_domain.h sys/termio.h sys/time.h \
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sys/times.h sys/types.h sys/uio.h sys/un.h sys/utsname.h sys/wait.h pty.h \
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libutil.h sys/resource.h netpacket/packet.h sysexits.h bluetooth.h \
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linux/tipc.h linux/random.h spawn.h util.h alloca.h endian.h \
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sys/endian.h sys/sysmacros.h
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sys/endian.h sys/sysmacros.h linux/memfd.h sys/memfd.h sys/mman.h
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do :
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as_ac_Header=`$as_echo "ac_cv_header_$ac_header" | $as_tr_sh`
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ac_fn_c_check_header_mongrel "$LINENO" "$ac_header" "$as_ac_Header" "$ac_includes_default"
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@ -11785,6 +11797,39 @@ $as_echo "no" >&6; }
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fi
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rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
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{ $as_echo "$as_me:${as_lineno-$LINENO}: checking for memfd_create" >&5
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$as_echo_n "checking for memfd_create... " >&6; }
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cat confdefs.h - <<_ACEOF >conftest.$ac_ext
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/* end confdefs.h. */
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#ifdef HAVE_SYS_MEMFD_H
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#include <sys/memfd.h>
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#endif
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int
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main ()
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{
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void *x=memfd_create
|
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;
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return 0;
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}
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_ACEOF
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if ac_fn_c_try_compile "$LINENO"; then :
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|
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$as_echo "#define HAVE_MEMFD_CREATE 1" >>confdefs.h
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: yes" >&5
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$as_echo "yes" >&6; }
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else
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{ $as_echo "$as_me:${as_lineno-$LINENO}: result: no" >&5
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$as_echo "no" >&6; }
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fi
|
||||
rm -f core conftest.err conftest.$ac_objext conftest.$ac_ext
|
||||
|
||||
# On some systems (eg. FreeBSD 5), we would find a definition of the
|
||||
# functions ctermid_r, setgroups in the library, but no prototype
|
||||
# (e.g. because we use _XOPEN_SOURCE). See whether we can take their
|
||||
|
|
|
|||
16
configure.ac
16
configure.ac
|
|
@ -2133,7 +2133,7 @@ sys/stat.h sys/syscall.h sys/sys_domain.h sys/termio.h sys/time.h \
|
|||
sys/times.h sys/types.h sys/uio.h sys/un.h sys/utsname.h sys/wait.h pty.h \
|
||||
libutil.h sys/resource.h netpacket/packet.h sysexits.h bluetooth.h \
|
||||
linux/tipc.h linux/random.h spawn.h util.h alloca.h endian.h \
|
||||
sys/endian.h sys/sysmacros.h)
|
||||
sys/endian.h sys/sysmacros.h linux/memfd.h sys/memfd.h sys/mman.h)
|
||||
AC_HEADER_DIRENT
|
||||
AC_HEADER_MAJOR
|
||||
|
||||
|
|
@ -3626,6 +3626,20 @@ AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
|
|||
[AC_MSG_RESULT(no)
|
||||
])
|
||||
|
||||
AC_MSG_CHECKING(for memfd_create)
|
||||
AC_COMPILE_IFELSE([AC_LANG_PROGRAM([[
|
||||
#ifdef HAVE_SYS_MMAN_H
|
||||
#include <sys/mman.h>
|
||||
#endif
|
||||
#ifdef HAVE_SYS_MEMFD_H
|
||||
#include <sys/memfd.h>
|
||||
#endif
|
||||
]], [[void *x=memfd_create]])],
|
||||
[AC_DEFINE(HAVE_MEMFD_CREATE, 1, Define if you have the 'memfd_create' function.)
|
||||
AC_MSG_RESULT(yes)],
|
||||
[AC_MSG_RESULT(no)
|
||||
])
|
||||
|
||||
# On some systems (eg. FreeBSD 5), we would find a definition of the
|
||||
# functions ctermid_r, setgroups in the library, but no prototype
|
||||
# (e.g. because we use _XOPEN_SOURCE). See whether we can take their
|
||||
|
|
|
|||
|
|
@ -625,6 +625,9 @@
|
|||
/* Define to 1 if you have the <linux/can/raw.h> header file. */
|
||||
#undef HAVE_LINUX_CAN_RAW_H
|
||||
|
||||
/* Define to 1 if you have the <linux/memfd.h> header file. */
|
||||
#undef HAVE_LINUX_MEMFD_H
|
||||
|
||||
/* Define to 1 if you have the <linux/netlink.h> header file. */
|
||||
#undef HAVE_LINUX_NETLINK_H
|
||||
|
||||
|
|
@ -667,15 +670,15 @@
|
|||
/* Define to 1 if you have the `mbrtowc' function. */
|
||||
#undef HAVE_MBRTOWC
|
||||
|
||||
/* Define if you have the 'memfd_create' function. */
|
||||
#undef HAVE_MEMFD_CREATE
|
||||
|
||||
/* Define to 1 if you have the <memory.h> header file. */
|
||||
#undef HAVE_MEMORY_H
|
||||
|
||||
/* Define to 1 if you have the `memrchr' function. */
|
||||
#undef HAVE_MEMRCHR
|
||||
|
||||
/* Define to 1 if you have the `memset_s' function. */
|
||||
#undef HAVE_MEMSET_S
|
||||
|
||||
/* Define to 1 if you have the `mkdirat' function. */
|
||||
#undef HAVE_MKDIRAT
|
||||
|
||||
|
|
@ -1119,6 +1122,9 @@
|
|||
/* Define to 1 if you have the <sys/lock.h> header file. */
|
||||
#undef HAVE_SYS_LOCK_H
|
||||
|
||||
/* Define to 1 if you have the <sys/memfd.h> header file. */
|
||||
#undef HAVE_SYS_MEMFD_H
|
||||
|
||||
/* Define to 1 if you have the <sys/mkdev.h> header file. */
|
||||
#undef HAVE_SYS_MKDEV_H
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue