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594 lines
16 KiB
594 lines
16 KiB
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/* fcntl module */ |
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|
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#include "Python.h" |
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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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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|
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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 |
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/* GNU extensions, as of glibc 2.2.4. */ |
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#ifdef F_SETLEASE |
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if (ins(d, "F_SETLEASE", (long)F_SETLEASE)) return -1; |
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#endif |
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#ifdef F_GETLEASE |
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if (ins(d, "F_GETLEASE", (long)F_GETLEASE)) return -1; |
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#endif |
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#ifdef F_NOTIFY |
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if (ins(d, "F_NOTIFY", (long)F_NOTIFY)) return -1; |
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#endif |
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/* Old BSD flock(). */ |
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#ifdef F_EXLCK |
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if (ins(d, "F_EXLCK", (long)F_EXLCK)) return -1; |
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#endif |
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#ifdef F_SHLCK |
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if (ins(d, "F_SHLCK", (long)F_SHLCK)) return -1; |
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#endif |
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|
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/* For F_{GET|SET}FL */ |
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#ifdef FD_CLOEXEC |
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if (ins(d, "FD_CLOEXEC", (long)FD_CLOEXEC)) return -1; |
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#endif |
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|
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/* For F_NOTIFY */ |
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#ifdef DN_ACCESS |
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if (ins(d, "DN_ACCESS", (long)DN_ACCESS)) return -1; |
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#endif |
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#ifdef DN_MODIFY |
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if (ins(d, "DN_MODIFY", (long)DN_MODIFY)) return -1; |
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#endif |
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#ifdef DN_CREATE |
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if (ins(d, "DN_CREATE", (long)DN_CREATE)) return -1; |
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#endif |
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#ifdef DN_DELETE |
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if (ins(d, "DN_DELETE", (long)DN_DELETE)) return -1; |
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#endif |
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#ifdef DN_RENAME |
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if (ins(d, "DN_RENAME", (long)DN_RENAME)) return -1; |
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#endif |
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#ifdef DN_ATTRIB |
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if (ins(d, "DN_ATTRIB", (long)DN_ATTRIB)) return -1; |
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#endif |
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#ifdef DN_MULTISHOT |
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if (ins(d, "DN_MULTISHOT", (long)DN_MULTISHOT)) return -1; |
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#endif |
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|
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#ifdef HAVE_STROPTS_H |
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/* Unix 98 guarantees that these are in stropts.h. */ |
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INS(I_PUSH); |
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INS(I_POP); |
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INS(I_LOOK); |
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INS(I_FLUSH); |
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INS(I_FLUSHBAND); |
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INS(I_SETSIG); |
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INS(I_GETSIG); |
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INS(I_FIND); |
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INS(I_PEEK); |
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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); |
|
}
|
|
|