mirror of
https://github.com/python/cpython.git
synced 2025-10-31 13:41:24 +00:00
594 lines
15 KiB
C
594 lines
15 KiB
C
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/* fcntl module */
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#include "Python.h"
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#ifdef HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#include <sys/ioctl.h>
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#include <fcntl.h>
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#ifdef HAVE_STROPTS_H
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#include <stropts.h>
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#endif
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static int
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conv_descriptor(PyObject *object, int *target)
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{
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int fd = PyObject_AsFileDescriptor(object);
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if (fd < 0)
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return 0;
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*target = fd;
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return 1;
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}
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/* fcntl(fd, opt, [arg]) */
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static PyObject *
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fcntl_fcntl(PyObject *self, PyObject *args)
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{
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int fd;
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int code;
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int arg;
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int ret;
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char *str;
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int len;
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char buf[1024];
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if (PyArg_ParseTuple(args, "O&is#:fcntl",
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conv_descriptor, &fd, &code, &str, &len)) {
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if (len > sizeof buf) {
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PyErr_SetString(PyExc_ValueError,
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"fcntl string arg too long");
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return NULL;
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}
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memcpy(buf, str, len);
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Py_BEGIN_ALLOW_THREADS
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ret = fcntl(fd, code, buf);
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Py_END_ALLOW_THREADS
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if (ret < 0) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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return PyString_FromStringAndSize(buf, len);
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}
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PyErr_Clear();
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arg = 0;
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if (!PyArg_ParseTuple(args,
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"O&i|i;fcntl requires a file or file descriptor,"
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" an integer and optionally a third integer or a string",
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conv_descriptor, &fd, &code, &arg)) {
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return NULL;
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}
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Py_BEGIN_ALLOW_THREADS
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ret = fcntl(fd, code, arg);
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Py_END_ALLOW_THREADS
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if (ret < 0) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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return PyInt_FromLong((long)ret);
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}
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PyDoc_STRVAR(fcntl_doc,
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"fcntl(fd, opt, [arg])\n\
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\n\
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Perform the requested operation on file descriptor fd. The operation\n\
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is defined by op and is operating system dependent. These constants are\n\
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available from the fcntl module. The argument arg is optional, and\n\
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defaults to 0; it may be an int or a string. If arg is given as a string,\n\
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the return value of fcntl is a string of that length, containing the\n\
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resulting value put in the arg buffer by the operating system.The length\n\
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of the arg string is not allowed to exceed 1024 bytes. If the arg given\n\
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is an integer or if none is specified, the result value is an integer\n\
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corresponding to the return value of the fcntl call in the C code.");
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/* ioctl(fd, opt, [arg]) */
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static PyObject *
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fcntl_ioctl(PyObject *self, PyObject *args)
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{
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int fd;
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int code;
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int arg;
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int ret;
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char *str;
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int len;
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int mutate_arg = 0;
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char buf[1024];
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if (PyArg_ParseTuple(args, "O&iw#|i:ioctl",
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conv_descriptor, &fd, &code,
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&str, &len, &mutate_arg)) {
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char *arg;
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if (PyTuple_Size(args) == 3) {
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/* warning goes here in 2.4 */
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mutate_arg = 0;
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}
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if (mutate_arg) {
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if (len <= sizeof buf) {
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memcpy(buf, str, len);
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arg = buf;
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}
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else {
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arg = str;
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}
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}
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else {
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if (len > sizeof buf) {
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PyErr_SetString(PyExc_ValueError,
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"ioctl string arg too long");
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return NULL;
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}
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else {
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memcpy(buf, str, len);
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arg = buf;
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}
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}
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if (buf == arg) {
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Py_BEGIN_ALLOW_THREADS /* think array.resize() */
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ret = ioctl(fd, code, arg);
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Py_END_ALLOW_THREADS
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}
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else {
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ret = ioctl(fd, code, arg);
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}
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if (mutate_arg && (len < sizeof buf)) {
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memcpy(str, buf, len);
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}
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if (ret < 0) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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if (mutate_arg) {
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return PyInt_FromLong(ret);
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}
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else {
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return PyString_FromStringAndSize(buf, len);
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}
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}
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PyErr_Clear();
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if (PyArg_ParseTuple(args, "O&is#:ioctl",
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conv_descriptor, &fd, &code, &str, &len)) {
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if (len > sizeof buf) {
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PyErr_SetString(PyExc_ValueError,
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"ioctl string arg too long");
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return NULL;
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}
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memcpy(buf, str, len);
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Py_BEGIN_ALLOW_THREADS
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ret = ioctl(fd, code, buf);
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Py_END_ALLOW_THREADS
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if (ret < 0) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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return PyString_FromStringAndSize(buf, len);
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}
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PyErr_Clear();
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arg = 0;
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if (!PyArg_ParseTuple(args,
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"O&i|i;ioctl requires a file or file descriptor,"
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" an integer and optionally a integer or buffer argument",
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conv_descriptor, &fd, &code, &arg)) {
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return NULL;
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}
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Py_BEGIN_ALLOW_THREADS
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#ifdef __VMS
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ret = ioctl(fd, code, (void *)arg);
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#else
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ret = ioctl(fd, code, arg);
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#endif
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Py_END_ALLOW_THREADS
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if (ret < 0) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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return PyInt_FromLong((long)ret);
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}
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PyDoc_STRVAR(ioctl_doc,
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"ioctl(fd, opt[, arg[, mutate_flag]])\n\
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\n\
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Perform the requested operation on file descriptor fd. The operation is\n\
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defined by opt and is operating system dependent. Typically these codes are\n\
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retrieved from the fcntl or termios library modules.\n\
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\n\
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The argument arg is optional, and defaults to 0; it may be an int or a\n\
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buffer containing character data (most likely a string or an array). \n\
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\n\
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If the argument is a mutable buffer (such as an array) and if the\n\
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mutate_flag argument (which is only allowed in this case) is true then the\n\
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buffer is (in effect) passed to the operating system and changes made by\n\
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the OS will be reflected in the contents of the buffer after the call has\n\
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returned. The return value is the integer returned by the ioctl system\n\
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call.\n\
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\n\
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If the argument is a mutable buffer and the mutable_flag argument is not\n\
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passed or is false, the behavior is as if a string had been passed. This\n\
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behavior will change in future releases of Python.\n\
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\n\
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If the argument is an immutable buffer (most likely a string) then a copy\n\
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of the buffer is passed to the operating system and the return value is a\n\
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string of the same length containing whatever the operating system put in\n\
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the buffer. The length of the arg buffer in this case is not allowed to\n\
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exceed 1024 bytes.\n\
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\n\
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If the arg given is an integer or if none is specified, the result value is\n\
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an integer corresponding to the return value of the ioctl call in the C\n\
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code.");
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/* flock(fd, operation) */
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static PyObject *
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fcntl_flock(PyObject *self, PyObject *args)
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{
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int fd;
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int code;
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int ret;
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if (!PyArg_ParseTuple(args, "O&i:flock",
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conv_descriptor, &fd, &code))
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return NULL;
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#ifdef HAVE_FLOCK
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Py_BEGIN_ALLOW_THREADS
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ret = flock(fd, code);
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Py_END_ALLOW_THREADS
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#else
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#ifndef LOCK_SH
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#define LOCK_SH 1 /* shared lock */
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#define LOCK_EX 2 /* exclusive lock */
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#define LOCK_NB 4 /* don't block when locking */
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#define LOCK_UN 8 /* unlock */
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#endif
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{
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struct flock l;
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if (code == LOCK_UN)
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l.l_type = F_UNLCK;
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else if (code & LOCK_SH)
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l.l_type = F_RDLCK;
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else if (code & LOCK_EX)
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l.l_type = F_WRLCK;
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else {
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PyErr_SetString(PyExc_ValueError,
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"unrecognized flock argument");
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return NULL;
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}
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l.l_whence = l.l_start = l.l_len = 0;
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Py_BEGIN_ALLOW_THREADS
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ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l);
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Py_END_ALLOW_THREADS
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}
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#endif /* HAVE_FLOCK */
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if (ret < 0) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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Py_INCREF(Py_None);
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return Py_None;
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}
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PyDoc_STRVAR(flock_doc,
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"flock(fd, operation)\n\
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\n\
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Perform the lock operation op on file descriptor fd. See the Unix \n\
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manual flock(3) for details. (On some systems, this function is\n\
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emulated using fcntl().)");
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/* lockf(fd, operation) */
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static PyObject *
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fcntl_lockf(PyObject *self, PyObject *args)
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{
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int fd, code, ret, whence = 0;
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PyObject *lenobj = NULL, *startobj = NULL;
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if (!PyArg_ParseTuple(args, "O&i|OOi:lockf",
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conv_descriptor, &fd, &code,
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&lenobj, &startobj, &whence))
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return NULL;
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#if defined(PYOS_OS2) && defined(PYCC_GCC)
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PyErr_SetString(PyExc_NotImplementedError,
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"lockf not supported on OS/2 (EMX)");
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return NULL;
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#else
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#ifndef LOCK_SH
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#define LOCK_SH 1 /* shared lock */
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#define LOCK_EX 2 /* exclusive lock */
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#define LOCK_NB 4 /* don't block when locking */
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#define LOCK_UN 8 /* unlock */
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#endif /* LOCK_SH */
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{
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struct flock l;
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if (code == LOCK_UN)
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l.l_type = F_UNLCK;
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else if (code & LOCK_SH)
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l.l_type = F_RDLCK;
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else if (code & LOCK_EX)
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l.l_type = F_WRLCK;
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else {
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PyErr_SetString(PyExc_ValueError,
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"unrecognized flock argument");
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return NULL;
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}
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l.l_start = l.l_len = 0;
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if (startobj != NULL) {
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#if !defined(HAVE_LARGEFILE_SUPPORT)
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l.l_start = PyInt_AsLong(startobj);
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#else
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l.l_start = PyLong_Check(startobj) ?
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PyLong_AsLongLong(startobj) :
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PyInt_AsLong(startobj);
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#endif
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if (PyErr_Occurred())
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return NULL;
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}
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if (lenobj != NULL) {
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#if !defined(HAVE_LARGEFILE_SUPPORT)
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l.l_len = PyInt_AsLong(lenobj);
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#else
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l.l_len = PyLong_Check(lenobj) ?
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PyLong_AsLongLong(lenobj) :
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PyInt_AsLong(lenobj);
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#endif
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if (PyErr_Occurred())
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return NULL;
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}
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l.l_whence = whence;
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Py_BEGIN_ALLOW_THREADS
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ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l);
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Py_END_ALLOW_THREADS
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}
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if (ret < 0) {
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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Py_INCREF(Py_None);
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return Py_None;
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#endif /* defined(PYOS_OS2) && defined(PYCC_GCC) */
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}
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PyDoc_STRVAR(lockf_doc,
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"lockf (fd, operation, length=0, start=0, whence=0)\n\
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\n\
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This is essentially a wrapper around the fcntl() locking calls. fd is the\n\
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file descriptor of the file to lock or unlock, and operation is one of the\n\
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following values:\n\
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\n\
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LOCK_UN - unlock\n\
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LOCK_SH - acquire a shared lock\n\
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LOCK_EX - acquire an exclusive lock\n\
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\n\
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When operation is LOCK_SH or LOCK_EX, it can also be bit-wise OR'd with\n\
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LOCK_NB to avoid blocking on lock acquisition. If LOCK_NB is used and the\n\
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lock cannot be acquired, an IOError will be raised and the exception will\n\
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have an errno attribute set to EACCES or EAGAIN (depending on the operating\n\
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system -- for portability, check for either value).\n\
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\n\
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length is the number of bytes to lock, with the default meaning to lock to\n\
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EOF. start is the byte offset, relative to whence, to that the lock\n\
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starts. whence is as with fileobj.seek(), specifically:\n\
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\n\
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0 - relative to the start of the file (SEEK_SET)\n\
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1 - relative to the current buffer position (SEEK_CUR)\n\
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2 - relative to the end of the file (SEEK_END)");
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/* List of functions */
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static PyMethodDef fcntl_methods[] = {
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{"fcntl", fcntl_fcntl, METH_VARARGS, fcntl_doc},
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{"ioctl", fcntl_ioctl, METH_VARARGS, ioctl_doc},
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{"flock", fcntl_flock, METH_VARARGS, flock_doc},
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{"lockf", fcntl_lockf, METH_VARARGS, lockf_doc},
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{NULL, NULL} /* sentinel */
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};
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PyDoc_STRVAR(module_doc,
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"This module performs file control and I/O control on file \n\
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descriptors. It is an interface to the fcntl() and ioctl() Unix\n\
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routines. File descriptors can be obtained with the fileno() method of\n\
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a file or socket object.");
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/* Module initialisation */
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static int
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ins(PyObject* d, char* symbol, long value)
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{
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PyObject* v = PyInt_FromLong(value);
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if (!v || PyDict_SetItemString(d, symbol, v) < 0)
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return -1;
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Py_DECREF(v);
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return 0;
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}
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#define INS(x) if (ins(d, #x, (long)x)) return -1
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static int
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all_ins(PyObject* d)
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{
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if (ins(d, "LOCK_SH", (long)LOCK_SH)) return -1;
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if (ins(d, "LOCK_EX", (long)LOCK_EX)) return -1;
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if (ins(d, "LOCK_NB", (long)LOCK_NB)) return -1;
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if (ins(d, "LOCK_UN", (long)LOCK_UN)) return -1;
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/* GNU extensions, as of glibc 2.2.4 */
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#ifdef LOCK_MAND
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if (ins(d, "LOCK_MAND", (long)LOCK_MAND)) return -1;
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#endif
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#ifdef LOCK_READ
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if (ins(d, "LOCK_READ", (long)LOCK_READ)) return -1;
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#endif
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#ifdef LOCK_WRITE
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if (ins(d, "LOCK_WRITE", (long)LOCK_WRITE)) return -1;
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#endif
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#ifdef LOCK_RW
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if (ins(d, "LOCK_RW", (long)LOCK_RW)) return -1;
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#endif
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#ifdef F_DUPFD
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if (ins(d, "F_DUPFD", (long)F_DUPFD)) return -1;
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#endif
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#ifdef F_GETFD
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if (ins(d, "F_GETFD", (long)F_GETFD)) return -1;
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#endif
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#ifdef F_SETFD
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if (ins(d, "F_SETFD", (long)F_SETFD)) return -1;
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#endif
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#ifdef F_GETFL
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if (ins(d, "F_GETFL", (long)F_GETFL)) return -1;
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#endif
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#ifdef F_SETFL
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if (ins(d, "F_SETFL", (long)F_SETFL)) return -1;
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#endif
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#ifdef F_GETLK
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if (ins(d, "F_GETLK", (long)F_GETLK)) return -1;
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#endif
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#ifdef F_SETLK
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if (ins(d, "F_SETLK", (long)F_SETLK)) return -1;
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#endif
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#ifdef F_SETLKW
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if (ins(d, "F_SETLKW", (long)F_SETLKW)) return -1;
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#endif
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#ifdef F_GETOWN
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if (ins(d, "F_GETOWN", (long)F_GETOWN)) return -1;
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#endif
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#ifdef F_SETOWN
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if (ins(d, "F_SETOWN", (long)F_SETOWN)) return -1;
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#endif
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#ifdef F_GETSIG
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if (ins(d, "F_GETSIG", (long)F_GETSIG)) return -1;
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#endif
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#ifdef F_SETSIG
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if (ins(d, "F_SETSIG", (long)F_SETSIG)) return -1;
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#endif
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#ifdef F_RDLCK
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if (ins(d, "F_RDLCK", (long)F_RDLCK)) return -1;
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#endif
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#ifdef F_WRLCK
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if (ins(d, "F_WRLCK", (long)F_WRLCK)) return -1;
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#endif
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#ifdef F_UNLCK
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if (ins(d, "F_UNLCK", (long)F_UNLCK)) return -1;
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#endif
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/* LFS constants */
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#ifdef F_GETLK64
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if (ins(d, "F_GETLK64", (long)F_GETLK64)) return -1;
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#endif
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#ifdef F_SETLK64
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if (ins(d, "F_SETLK64", (long)F_SETLK64)) return -1;
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#endif
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#ifdef F_SETLKW64
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if (ins(d, "F_SETLKW64", (long)F_SETLKW64)) return -1;
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#endif
|
|
/* GNU extensions, as of glibc 2.2.4. */
|
|
#ifdef F_SETLEASE
|
|
if (ins(d, "F_SETLEASE", (long)F_SETLEASE)) return -1;
|
|
#endif
|
|
#ifdef F_GETLEASE
|
|
if (ins(d, "F_GETLEASE", (long)F_GETLEASE)) return -1;
|
|
#endif
|
|
#ifdef F_NOTIFY
|
|
if (ins(d, "F_NOTIFY", (long)F_NOTIFY)) return -1;
|
|
#endif
|
|
/* Old BSD flock(). */
|
|
#ifdef F_EXLCK
|
|
if (ins(d, "F_EXLCK", (long)F_EXLCK)) return -1;
|
|
#endif
|
|
#ifdef F_SHLCK
|
|
if (ins(d, "F_SHLCK", (long)F_SHLCK)) return -1;
|
|
#endif
|
|
|
|
/* For F_{GET|SET}FL */
|
|
#ifdef FD_CLOEXEC
|
|
if (ins(d, "FD_CLOEXEC", (long)FD_CLOEXEC)) return -1;
|
|
#endif
|
|
|
|
/* For F_NOTIFY */
|
|
#ifdef DN_ACCESS
|
|
if (ins(d, "DN_ACCESS", (long)DN_ACCESS)) return -1;
|
|
#endif
|
|
#ifdef DN_MODIFY
|
|
if (ins(d, "DN_MODIFY", (long)DN_MODIFY)) return -1;
|
|
#endif
|
|
#ifdef DN_CREATE
|
|
if (ins(d, "DN_CREATE", (long)DN_CREATE)) return -1;
|
|
#endif
|
|
#ifdef DN_DELETE
|
|
if (ins(d, "DN_DELETE", (long)DN_DELETE)) return -1;
|
|
#endif
|
|
#ifdef DN_RENAME
|
|
if (ins(d, "DN_RENAME", (long)DN_RENAME)) return -1;
|
|
#endif
|
|
#ifdef DN_ATTRIB
|
|
if (ins(d, "DN_ATTRIB", (long)DN_ATTRIB)) return -1;
|
|
#endif
|
|
#ifdef DN_MULTISHOT
|
|
if (ins(d, "DN_MULTISHOT", (long)DN_MULTISHOT)) return -1;
|
|
#endif
|
|
|
|
#ifdef HAVE_STROPTS_H
|
|
/* Unix 98 guarantees that these are in stropts.h. */
|
|
INS(I_PUSH);
|
|
INS(I_POP);
|
|
INS(I_LOOK);
|
|
INS(I_FLUSH);
|
|
INS(I_FLUSHBAND);
|
|
INS(I_SETSIG);
|
|
INS(I_GETSIG);
|
|
INS(I_FIND);
|
|
INS(I_PEEK);
|
|
INS(I_SRDOPT);
|
|
INS(I_GRDOPT);
|
|
INS(I_NREAD);
|
|
INS(I_FDINSERT);
|
|
INS(I_STR);
|
|
INS(I_SWROPT);
|
|
#ifdef I_GWROPT
|
|
/* despite the comment above, old-ish glibcs miss a couple... */
|
|
INS(I_GWROPT);
|
|
#endif
|
|
INS(I_SENDFD);
|
|
INS(I_RECVFD);
|
|
INS(I_LIST);
|
|
INS(I_ATMARK);
|
|
INS(I_CKBAND);
|
|
INS(I_GETBAND);
|
|
INS(I_CANPUT);
|
|
INS(I_SETCLTIME);
|
|
#ifdef I_GETCLTIME
|
|
INS(I_GETCLTIME);
|
|
#endif
|
|
INS(I_LINK);
|
|
INS(I_UNLINK);
|
|
INS(I_PLINK);
|
|
INS(I_PUNLINK);
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
PyMODINIT_FUNC
|
|
initfcntl(void)
|
|
{
|
|
PyObject *m, *d;
|
|
|
|
/* Create the module and add the functions and documentation */
|
|
m = Py_InitModule3("fcntl", fcntl_methods, module_doc);
|
|
|
|
/* Add some symbolic constants to the module */
|
|
d = PyModule_GetDict(m);
|
|
all_ins(d);
|
|
}
|