bpo-26826: Expose copy_file_range in the os module (GH-7255)
This commit is contained in:
Pablo Galindo
GitHub
parent
545a3b8814
commit
aac4d0342c
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@ -707,6 +707,28 @@ as internal buffering of data.
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pass
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.. function:: copy_file_range(src, dst, count, offset_src=None, offset_dst=None)
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Copy *count* bytes from file descriptor *src*, starting from offset
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*offset_src*, to file descriptor *dst*, starting from offset *offset_dst*.
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If *offset_src* is None, then *src* is read from the current position;
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respectively for *offset_dst*. The files pointed by *src* and *dst*
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must reside in the same filesystem, otherwise an :exc:`OSError` is
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raised with :attr:`~OSError.errno` set to :data:`errno.EXDEV`.
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This copy is done without the additional cost of transferring data
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from the kernel to user space and then back into the kernel. Additionally,
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some filesystems could implement extra optimizations. The copy is done as if
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both files are opened as binary.
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The return value is the amount of bytes copied. This could be less than the
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amount requested.
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.. availability:: Linux kernel >= 4.5 or glibc >= 2.27.
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.. versionadded:: 3.8
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.. function:: device_encoding(fd)
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Return a string describing the encoding of the device associated with *fd*
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@ -231,6 +231,89 @@ class FileTests(unittest.TestCase):
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except (NotImplementedError, OSError):
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pass # No OS support or unprivileged user
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@unittest.skipUnless(hasattr(os, 'copy_file_range'), 'test needs os.copy_file_range()')
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def test_copy_file_range_invalid_values(self):
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with self.assertRaises(ValueError):
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os.copy_file_range(0, 1, -10)
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@unittest.skipUnless(hasattr(os, 'copy_file_range'), 'test needs os.copy_file_range()')
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def test_copy_file_range(self):
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TESTFN2 = support.TESTFN + ".3"
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data = b'0123456789'
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create_file(support.TESTFN, data)
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self.addCleanup(support.unlink, support.TESTFN)
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in_file = open(support.TESTFN, 'rb')
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self.addCleanup(in_file.close)
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in_fd = in_file.fileno()
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out_file = open(TESTFN2, 'w+b')
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self.addCleanup(support.unlink, TESTFN2)
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self.addCleanup(out_file.close)
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out_fd = out_file.fileno()
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try:
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i = os.copy_file_range(in_fd, out_fd, 5)
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except OSError as e:
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# Handle the case in which Python was compiled
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# in a system with the syscall but without support
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# in the kernel.
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if e.errno != errno.ENOSYS:
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raise
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self.skipTest(e)
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else:
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# The number of copied bytes can be less than
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# the number of bytes originally requested.
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self.assertIn(i, range(0, 6));
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with open(TESTFN2, 'rb') as in_file:
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self.assertEqual(in_file.read(), data[:i])
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@unittest.skipUnless(hasattr(os, 'copy_file_range'), 'test needs os.copy_file_range()')
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def test_copy_file_range_offset(self):
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TESTFN4 = support.TESTFN + ".4"
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data = b'0123456789'
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bytes_to_copy = 6
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in_skip = 3
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out_seek = 5
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create_file(support.TESTFN, data)
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self.addCleanup(support.unlink, support.TESTFN)
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in_file = open(support.TESTFN, 'rb')
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self.addCleanup(in_file.close)
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in_fd = in_file.fileno()
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out_file = open(TESTFN4, 'w+b')
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self.addCleanup(support.unlink, TESTFN4)
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self.addCleanup(out_file.close)
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out_fd = out_file.fileno()
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try:
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i = os.copy_file_range(in_fd, out_fd, bytes_to_copy,
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offset_src=in_skip,
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offset_dst=out_seek)
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except OSError as e:
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# Handle the case in which Python was compiled
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# in a system with the syscall but without support
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# in the kernel.
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if e.errno != errno.ENOSYS:
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raise
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self.skipTest(e)
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else:
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# The number of copied bytes can be less than
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# the number of bytes originally requested.
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self.assertIn(i, range(0, bytes_to_copy+1));
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with open(TESTFN4, 'rb') as in_file:
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read = in_file.read()
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# seeked bytes (5) are zero'ed
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self.assertEqual(read[:out_seek], b'\x00'*out_seek)
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# 012 are skipped (in_skip)
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# 345678 are copied in the file (in_skip + bytes_to_copy)
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self.assertEqual(read[out_seek:],
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data[in_skip:in_skip+i])
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# Test attributes on return values from os.*stat* family.
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class StatAttributeTests(unittest.TestCase):
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@ -0,0 +1 @@
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Expose :func:`copy_file_range` as a low level API in the :mod:`os` module.
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@ -5395,6 +5395,108 @@ exit:
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#endif /* (defined(HAVE_PWRITEV) || defined (HAVE_PWRITEV2)) */
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#if defined(HAVE_COPY_FILE_RANGE)
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PyDoc_STRVAR(os_copy_file_range__doc__,
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"copy_file_range($module, /, src, dst, count, offset_src=None,\n"
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" offset_dst=None)\n"
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"--\n"
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"\n"
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"Copy count bytes from one file descriptor to another.\n"
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"\n"
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" src\n"
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" Source file descriptor.\n"
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" dst\n"
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" Destination file descriptor.\n"
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" count\n"
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" Number of bytes to copy.\n"
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" offset_src\n"
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" Starting offset in src.\n"
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" offset_dst\n"
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" Starting offset in dst.\n"
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"\n"
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"If offset_src is None, then src is read from the current position;\n"
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"respectively for offset_dst.");
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#define OS_COPY_FILE_RANGE_METHODDEF \
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{"copy_file_range", (PyCFunction)(void(*)(void))os_copy_file_range, METH_FASTCALL|METH_KEYWORDS, os_copy_file_range__doc__},
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static PyObject *
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os_copy_file_range_impl(PyObject *module, int src, int dst, Py_ssize_t count,
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PyObject *offset_src, PyObject *offset_dst);
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static PyObject *
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os_copy_file_range(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[] = {"src", "dst", "count", "offset_src", "offset_dst", NULL};
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static _PyArg_Parser _parser = {NULL, _keywords, "copy_file_range", 0};
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PyObject *argsbuf[5];
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Py_ssize_t noptargs = nargs + (kwnames ? PyTuple_GET_SIZE(kwnames) : 0) - 3;
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int src;
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int dst;
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Py_ssize_t count;
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PyObject *offset_src = Py_None;
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PyObject *offset_dst = Py_None;
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args = _PyArg_UnpackKeywords(args, nargs, NULL, kwnames, &_parser, 3, 5, 0, argsbuf);
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if (!args) {
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goto exit;
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}
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if (PyFloat_Check(args[0])) {
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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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src = _PyLong_AsInt(args[0]);
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if (src == -1 && PyErr_Occurred()) {
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goto exit;
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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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dst = _PyLong_AsInt(args[1]);
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if (dst == -1 && PyErr_Occurred()) {
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goto exit;
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}
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if (PyFloat_Check(args[2])) {
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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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{
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Py_ssize_t ival = -1;
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PyObject *iobj = PyNumber_Index(args[2]);
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if (iobj != NULL) {
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ival = PyLong_AsSsize_t(iobj);
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Py_DECREF(iobj);
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}
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if (ival == -1 && PyErr_Occurred()) {
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goto exit;
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}
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count = ival;
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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 (args[3]) {
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offset_src = args[3];
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if (!--noptargs) {
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goto skip_optional_pos;
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}
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}
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offset_dst = args[4];
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skip_optional_pos:
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return_value = os_copy_file_range_impl(module, src, dst, count, offset_src, offset_dst);
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exit:
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return return_value;
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}
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#endif /* defined(HAVE_COPY_FILE_RANGE) */
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#if defined(HAVE_MKFIFO)
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PyDoc_STRVAR(os_mkfifo__doc__,
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@ -8460,6 +8562,10 @@ exit:
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#define OS_PWRITEV_METHODDEF
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#endif /* !defined(OS_PWRITEV_METHODDEF) */
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#ifndef OS_COPY_FILE_RANGE_METHODDEF
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#define OS_COPY_FILE_RANGE_METHODDEF
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#endif /* !defined(OS_COPY_FILE_RANGE_METHODDEF) */
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#ifndef OS_MKFIFO_METHODDEF
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#define OS_MKFIFO_METHODDEF
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#endif /* !defined(OS_MKFIFO_METHODDEF) */
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@ -8635,4 +8741,4 @@ 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=855b81aafd05beed input=a9049054013a1b77]*/
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/*[clinic end generated code: output=b3ae8afd275ea5cd input=a9049054013a1b77]*/
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@ -117,6 +117,10 @@ corresponding Unix manual entries for more information on calls.");
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#include <sched.h>
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#endif
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#ifdef HAVE_COPY_FILE_RANGE
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#include <unistd.h>
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#endif
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#if !defined(CPU_ALLOC) && defined(HAVE_SCHED_SETAFFINITY)
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#undef HAVE_SCHED_SETAFFINITY
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#endif
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@ -9455,8 +9459,74 @@ os_pwritev_impl(PyObject *module, int fd, PyObject *buffers, Py_off_t offset,
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}
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#endif /* HAVE_PWRITEV */
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#ifdef HAVE_COPY_FILE_RANGE
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/*[clinic input]
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os.copy_file_range
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src: int
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Source file descriptor.
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dst: int
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Destination file descriptor.
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count: Py_ssize_t
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Number of bytes to copy.
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offset_src: object = None
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Starting offset in src.
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offset_dst: object = None
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Starting offset in dst.
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Copy count bytes from one file descriptor to another.
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If offset_src is None, then src is read from the current position;
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respectively for offset_dst.
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[clinic start generated code]*/
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static PyObject *
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os_copy_file_range_impl(PyObject *module, int src, int dst, Py_ssize_t count,
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PyObject *offset_src, PyObject *offset_dst)
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/*[clinic end generated code: output=1a91713a1d99fc7a input=42fdce72681b25a9]*/
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{
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off_t offset_src_val, offset_dst_val;
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off_t *p_offset_src = NULL;
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off_t *p_offset_dst = NULL;
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Py_ssize_t ret;
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int async_err = 0;
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/* The flags argument is provided to allow
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* for future extensions and currently must be to 0. */
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int flags = 0;
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if (count < 0) {
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PyErr_SetString(PyExc_ValueError, "negative value for 'count' not allowed");
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return NULL;
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}
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if (offset_src != Py_None) {
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if (!Py_off_t_converter(offset_src, &offset_src_val)) {
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return NULL;
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}
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p_offset_src = &offset_src_val;
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}
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if (offset_dst != Py_None) {
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if (!Py_off_t_converter(offset_dst, &offset_dst_val)) {
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return NULL;
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}
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p_offset_dst = &offset_dst_val;
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}
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do {
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Py_BEGIN_ALLOW_THREADS
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ret = copy_file_range(src, p_offset_src, dst, p_offset_dst, count, flags);
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Py_END_ALLOW_THREADS
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} while (ret < 0 && errno == EINTR && !(async_err = PyErr_CheckSignals()));
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if (ret < 0) {
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return (!async_err) ? posix_error() : NULL;
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}
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return PyLong_FromSsize_t(ret);
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}
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#endif /* HAVE_COPY_FILE_RANGE*/
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#ifdef HAVE_MKFIFO
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/*[clinic input]
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@ -13432,6 +13502,7 @@ static PyMethodDef posix_methods[] = {
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OS_POSIX_SPAWN_METHODDEF
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OS_POSIX_SPAWNP_METHODDEF
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OS_READLINK_METHODDEF
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OS_COPY_FILE_RANGE_METHODDEF
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OS_RENAME_METHODDEF
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OS_REPLACE_METHODDEF
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OS_RMDIR_METHODDEF
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@ -12,9 +12,9 @@
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# PARTICULAR PURPOSE.
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m4_ifndef([AC_CONFIG_MACRO_DIRS], [m4_defun([_AM_CONFIG_MACRO_DIRS], [])m4_defun([AC_CONFIG_MACRO_DIRS], [_AM_CONFIG_MACRO_DIRS($@)])])
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dnl pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
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dnl serial 11 (pkg-config-0.29.1)
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dnl
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# pkg.m4 - Macros to locate and utilise pkg-config. -*- Autoconf -*-
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# serial 11 (pkg-config-0.29.1)
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dnl Copyright © 2004 Scott James Remnant <scott@netsplit.com>.
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dnl Copyright © 2012-2015 Dan Nicholson <dbn.lists@gmail.com>
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dnl
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@ -288,5 +288,73 @@ AS_VAR_COPY([$1], [pkg_cv_][$1])
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AS_VAR_IF([$1], [""], [$5], [$4])dnl
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])dnl PKG_CHECK_VAR
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dnl PKG_WITH_MODULES(VARIABLE-PREFIX, MODULES,
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dnl [ACTION-IF-FOUND],[ACTION-IF-NOT-FOUND],
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dnl [DESCRIPTION], [DEFAULT])
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dnl ------------------------------------------
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dnl
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dnl Prepare a "--with-" configure option using the lowercase
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dnl [VARIABLE-PREFIX] name, merging the behaviour of AC_ARG_WITH and
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dnl PKG_CHECK_MODULES in a single macro.
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AC_DEFUN([PKG_WITH_MODULES],
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[
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m4_pushdef([with_arg], m4_tolower([$1]))
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m4_pushdef([description],
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[m4_default([$5], [build with ]with_arg[ support])])
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m4_pushdef([def_arg], [m4_default([$6], [auto])])
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m4_pushdef([def_action_if_found], [AS_TR_SH([with_]with_arg)=yes])
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m4_pushdef([def_action_if_not_found], [AS_TR_SH([with_]with_arg)=no])
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m4_case(def_arg,
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[yes],[m4_pushdef([with_without], [--without-]with_arg)],
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[m4_pushdef([with_without],[--with-]with_arg)])
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AC_ARG_WITH(with_arg,
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AS_HELP_STRING(with_without, description[ @<:@default=]def_arg[@:>@]),,
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[AS_TR_SH([with_]with_arg)=def_arg])
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AS_CASE([$AS_TR_SH([with_]with_arg)],
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[yes],[PKG_CHECK_MODULES([$1],[$2],$3,$4)],
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[auto],[PKG_CHECK_MODULES([$1],[$2],
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[m4_n([def_action_if_found]) $3],
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[m4_n([def_action_if_not_found]) $4])])
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m4_popdef([with_arg])
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m4_popdef([description])
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m4_popdef([def_arg])
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])dnl PKG_WITH_MODULES
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dnl PKG_HAVE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
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dnl [DESCRIPTION], [DEFAULT])
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dnl -----------------------------------------------
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dnl
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dnl Convenience macro to trigger AM_CONDITIONAL after PKG_WITH_MODULES
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dnl check._[VARIABLE-PREFIX] is exported as make variable.
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AC_DEFUN([PKG_HAVE_WITH_MODULES],
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[
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PKG_WITH_MODULES([$1],[$2],,,[$3],[$4])
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AM_CONDITIONAL([HAVE_][$1],
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[test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"])
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])dnl PKG_HAVE_WITH_MODULES
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dnl PKG_HAVE_DEFINE_WITH_MODULES(VARIABLE-PREFIX, MODULES,
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dnl [DESCRIPTION], [DEFAULT])
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dnl ------------------------------------------------------
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dnl
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dnl Convenience macro to run AM_CONDITIONAL and AC_DEFINE after
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dnl PKG_WITH_MODULES check. HAVE_[VARIABLE-PREFIX] is exported as make
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dnl and preprocessor variable.
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AC_DEFUN([PKG_HAVE_DEFINE_WITH_MODULES],
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[
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PKG_HAVE_WITH_MODULES([$1],[$2],[$3],[$4])
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AS_IF([test "$AS_TR_SH([with_]m4_tolower([$1]))" = "yes"],
|
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[AC_DEFINE([HAVE_][$1], 1, [Enable ]m4_tolower([$1])[ support])])
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])dnl PKG_HAVE_DEFINE_WITH_MODULES
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|
||||
m4_include([m4/ax_c_float_words_bigendian.m4])
|
||||
m4_include([m4/ax_check_openssl.m4])
|
||||
|
|
|
|||
|
|
@ -785,7 +785,6 @@ infodir
|
|||
docdir
|
||||
oldincludedir
|
||||
includedir
|
||||
runstatedir
|
||||
localstatedir
|
||||
sharedstatedir
|
||||
sysconfdir
|
||||
|
|
@ -898,7 +897,6 @@ datadir='${datarootdir}'
|
|||
sysconfdir='${prefix}/etc'
|
||||
sharedstatedir='${prefix}/com'
|
||||
localstatedir='${prefix}/var'
|
||||
runstatedir='${localstatedir}/run'
|
||||
includedir='${prefix}/include'
|
||||
oldincludedir='/usr/include'
|
||||
docdir='${datarootdir}/doc/${PACKAGE_TARNAME}'
|
||||
|
|
@ -1151,15 +1149,6 @@ do
|
|||
| -silent | --silent | --silen | --sile | --sil)
|
||||
silent=yes ;;
|
||||
|
||||
-runstatedir | --runstatedir | --runstatedi | --runstated \
|
||||
| --runstate | --runstat | --runsta | --runst | --runs \
|
||||
| --run | --ru | --r)
|
||||
ac_prev=runstatedir ;;
|
||||
-runstatedir=* | --runstatedir=* | --runstatedi=* | --runstated=* \
|
||||
| --runstate=* | --runstat=* | --runsta=* | --runst=* | --runs=* \
|
||||
| --run=* | --ru=* | --r=*)
|
||||
runstatedir=$ac_optarg ;;
|
||||
|
||||
-sbindir | --sbindir | --sbindi | --sbind | --sbin | --sbi | --sb)
|
||||
ac_prev=sbindir ;;
|
||||
-sbindir=* | --sbindir=* | --sbindi=* | --sbind=* | --sbin=* \
|
||||
|
|
@ -1297,7 +1286,7 @@ fi
|
|||
for ac_var in exec_prefix prefix bindir sbindir libexecdir datarootdir \
|
||||
datadir sysconfdir sharedstatedir localstatedir includedir \
|
||||
oldincludedir docdir infodir htmldir dvidir pdfdir psdir \
|
||||
libdir localedir mandir runstatedir
|
||||
libdir localedir mandir
|
||||
do
|
||||
eval ac_val=\$$ac_var
|
||||
# Remove trailing slashes.
|
||||
|
|
@ -1450,7 +1439,6 @@ Fine tuning of the installation directories:
|
|||
--sysconfdir=DIR read-only single-machine data [PREFIX/etc]
|
||||
--sharedstatedir=DIR modifiable architecture-independent data [PREFIX/com]
|
||||
--localstatedir=DIR modifiable single-machine data [PREFIX/var]
|
||||
--runstatedir=DIR modifiable per-process data [LOCALSTATEDIR/run]
|
||||
--libdir=DIR object code libraries [EPREFIX/lib]
|
||||
--includedir=DIR C header files [PREFIX/include]
|
||||
--oldincludedir=DIR C header files for non-gcc [/usr/include]
|
||||
|
|
@ -11476,7 +11464,8 @@ fi
|
|||
|
||||
# checks for library functions
|
||||
for ac_func in alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
|
||||
clock confstr ctermid dup3 execv explicit_bzero explicit_memset faccessat fchmod fchmodat fchown fchownat \
|
||||
clock confstr copy_file_range ctermid dup3 execv explicit_bzero explicit_memset \
|
||||
faccessat fchmod fchmodat fchown fchownat \
|
||||
fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
|
||||
futimens futimes gai_strerror getentropy \
|
||||
getgrgid_r getgrnam_r \
|
||||
|
|
|
|||
|
|
@ -3520,7 +3520,8 @@ fi
|
|||
|
||||
# checks for library functions
|
||||
AC_CHECK_FUNCS(alarm accept4 setitimer getitimer bind_textdomain_codeset chown \
|
||||
clock confstr ctermid dup3 execv explicit_bzero explicit_memset faccessat fchmod fchmodat fchown fchownat \
|
||||
clock confstr copy_file_range ctermid dup3 execv explicit_bzero explicit_memset \
|
||||
faccessat fchmod fchmodat fchown fchownat \
|
||||
fexecve fdopendir fork fpathconf fstatat ftime ftruncate futimesat \
|
||||
futimens futimes gai_strerror getentropy \
|
||||
getgrgid_r getgrnam_r \
|
||||
|
|
|
|||
|
|
@ -148,6 +148,9 @@
|
|||
/* Define to 1 if you have the `copysign' function. */
|
||||
#undef HAVE_COPYSIGN
|
||||
|
||||
/* Define to 1 if you have the `copy_file_range' function. */
|
||||
#undef HAVE_COPY_FILE_RANGE
|
||||
|
||||
/* Define to 1 if you have the <crypt.h> header file. */
|
||||
#undef HAVE_CRYPT_H
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue