mirror of
https://github.com/python/cpython.git
synced 2024-11-27 20:04:41 +08:00
647 lines
19 KiB
C
647 lines
19 KiB
C
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/* fcntl module */
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#define PY_SSIZE_T_CLEAN
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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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/*[clinic input]
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module fcntl
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[clinic start generated code]*/
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/*[clinic end generated code: output=da39a3ee5e6b4b0d input=124b58387c158179]*/
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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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/* Must come after conv_descriptor definition. */
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#include "clinic/fcntlmodule.c.h"
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/*[clinic input]
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fcntl.fcntl
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fd: object(type='int', converter='conv_descriptor')
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cmd as code: int
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arg: object(c_default='NULL') = 0
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/
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Perform the operation `cmd` on file descriptor fd.
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The values used for `cmd` are operating system dependent, and are available
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as constants in the fcntl module, using the same names as used in
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the relevant C header files. The argument arg is optional, and
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defaults to 0; it may be an int or a string. If arg is given as a string,
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the return value of fcntl is a string of that length, containing the
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resulting value put in the arg buffer by the operating system. The length
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of the arg string is not allowed to exceed 1024 bytes. If the arg given
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is an integer or if none is specified, the result value is an integer
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corresponding to the return value of the fcntl call in the C code.
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[clinic start generated code]*/
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static PyObject *
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fcntl_fcntl_impl(PyModuleDef *module, int fd, int code, PyObject *arg)
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/*[clinic end generated code: output=afc5bfa74a03ef0d input=8cefbe59b29efbe2]*/
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{
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unsigned int int_arg = 0;
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int ret;
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char *str;
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Py_ssize_t len;
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char buf[1024];
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if (arg != NULL) {
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int parse_result;
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if (PyArg_Parse(arg, "s#", &str, &len)) {
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if ((size_t)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 PyBytes_FromStringAndSize(buf, len);
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}
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PyErr_Clear();
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parse_result = PyArg_Parse(arg,
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"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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&int_arg);
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if (!parse_result) {
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return NULL;
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}
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}
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Py_BEGIN_ALLOW_THREADS
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ret = fcntl(fd, code, (int)int_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 PyLong_FromLong((long)ret);
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}
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/*[clinic input]
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fcntl.ioctl
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fd: object(type='int', converter='conv_descriptor')
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request as code: unsigned_int(bitwise=True)
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arg as ob_arg: object(c_default='NULL') = 0
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mutate_flag as mutate_arg: bool = True
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/
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Perform the operation `request` on file descriptor `fd`.
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The values used for `request` are operating system dependent, and are available
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as constants in the fcntl or termios library modules, using the same names as
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used in the relevant C header files.
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The argument `arg` is optional, and defaults to 0; it may be an int or a
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buffer containing character data (most likely a string or an array).
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If the argument is a mutable buffer (such as an array) and if the
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mutate_flag argument (which is only allowed in this case) is true then the
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buffer is (in effect) passed to the operating system and changes made by
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the OS will be reflected in the contents of the buffer after the call has
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returned. The return value is the integer returned by the ioctl system
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call.
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If the argument is a mutable buffer and the mutable_flag argument is false,
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the behavior is as if a string had been passed.
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If the argument is an immutable buffer (most likely a string) then a copy
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of the buffer is passed to the operating system and the return value is a
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string of the same length containing whatever the operating system put in
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the buffer. The length of the arg buffer in this case is not allowed to
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exceed 1024 bytes.
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If the arg given is an integer or if none is specified, the result value is
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an integer corresponding to the return value of the ioctl call in the C
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code.
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[clinic start generated code]*/
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static PyObject *
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fcntl_ioctl_impl(PyModuleDef *module, int fd, unsigned int code,
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PyObject *ob_arg, int mutate_arg)
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/*[clinic end generated code: output=102faa0f7ebe2210 input=ede70c433cccbbb2]*/
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{
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#define IOCTL_BUFSZ 1024
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/* We use the unsigned non-checked 'I' format for the 'code' parameter
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because the system expects it to be a 32bit bit field value
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regardless of it being passed as an int or unsigned long on
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various platforms. See the termios.TIOCSWINSZ constant across
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platforms for an example of this.
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If any of the 64bit platforms ever decide to use more than 32bits
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in their unsigned long ioctl codes this will break and need
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special casing based on the platform being built on.
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*/
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int arg = 0;
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int ret;
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Py_buffer pstr;
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char *str;
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Py_ssize_t len;
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char buf[IOCTL_BUFSZ+1]; /* argument plus NUL byte */
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if (ob_arg != NULL) {
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if (PyArg_Parse(ob_arg, "w*:ioctl", &pstr)) {
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char *arg;
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str = pstr.buf;
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len = pstr.len;
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if (mutate_arg) {
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if (len <= IOCTL_BUFSZ) {
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memcpy(buf, str, len);
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buf[len] = '\0';
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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 > IOCTL_BUFSZ) {
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PyBuffer_Release(&pstr);
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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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buf[len] = '\0';
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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 <= IOCTL_BUFSZ)) {
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memcpy(str, buf, len);
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}
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PyBuffer_Release(&pstr); /* No further access to str below this point */
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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 PyLong_FromLong(ret);
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}
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else {
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return PyBytes_FromStringAndSize(buf, len);
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}
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}
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PyErr_Clear();
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if (PyArg_Parse(ob_arg, "s*:ioctl", &pstr)) {
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str = pstr.buf;
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len = pstr.len;
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if (len > IOCTL_BUFSZ) {
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PyBuffer_Release(&pstr);
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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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buf[len] = '\0';
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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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PyBuffer_Release(&pstr);
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PyErr_SetFromErrno(PyExc_IOError);
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return NULL;
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}
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PyBuffer_Release(&pstr);
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return PyBytes_FromStringAndSize(buf, len);
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}
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PyErr_Clear();
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if (!PyArg_Parse(ob_arg,
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"i;ioctl requires a file or file descriptor,"
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" an integer and optionally an integer or buffer argument",
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&arg)) {
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return NULL;
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}
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// Fall-through to outside the 'if' statement.
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}
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Py_BEGIN_ALLOW_THREADS
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ret = ioctl(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 PyLong_FromLong((long)ret);
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#undef IOCTL_BUFSZ
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}
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/*[clinic input]
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fcntl.flock
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fd: object(type='int', converter='conv_descriptor')
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operation as code: int
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/
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Perform the lock operation `operation` on file descriptor `fd`.
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See the Unix manual page for flock(2) for details (On some systems, this
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function is emulated using fcntl()).
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[clinic start generated code]*/
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static PyObject *
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fcntl_flock_impl(PyModuleDef *module, int fd, int code)
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/*[clinic end generated code: output=c9035133a7dbfc96 input=b70a0a41ca22a8a0]*/
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{
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int ret;
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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_RETURN_NONE;
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}
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/*[clinic input]
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fcntl.lockf
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fd: object(type='int', converter='conv_descriptor')
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cmd as code: int
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len as lenobj: object(c_default='NULL') = 0
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start as startobj: object(c_default='NULL') = 0
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whence: int = 0
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/
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A wrapper around the fcntl() locking calls.
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`fd` is the file descriptor of the file to lock or unlock, and operation is one
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of the following values:
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LOCK_UN - unlock
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LOCK_SH - acquire a shared lock
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LOCK_EX - acquire an exclusive lock
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When operation is LOCK_SH or LOCK_EX, it can also be bitwise ORed with
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LOCK_NB to avoid blocking on lock acquisition. If LOCK_NB is used and the
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lock cannot be acquired, an OSError will be raised and the exception will
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have an errno attribute set to EACCES or EAGAIN (depending on the operating
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system -- for portability, check for either value).
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`len` is the number of bytes to lock, with the default meaning to lock to
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EOF. `start` is the byte offset, relative to `whence`, to that the lock
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starts. `whence` is as with fileobj.seek(), specifically:
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0 - relative to the start of the file (SEEK_SET)
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1 - relative to the current buffer position (SEEK_CUR)
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2 - relative to the end of the file (SEEK_END)
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[clinic start generated code]*/
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static PyObject *
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fcntl_lockf_impl(PyModuleDef *module, int fd, int code, PyObject *lenobj,
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PyObject *startobj, int whence)
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/*[clinic end generated code: output=31af35eba08b9af7 input=3a5dc01b04371f1a]*/
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{
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int ret;
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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 lockf 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 = PyLong_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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PyLong_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 = PyLong_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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PyLong_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_RETURN_NONE;
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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_METHODDEF
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FCNTL_IOCTL_METHODDEF
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FCNTL_FLOCK_METHODDEF
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FCNTL_LOCKF_METHODDEF
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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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all_ins(PyObject* m)
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{
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if (PyModule_AddIntMacro(m, LOCK_SH)) return -1;
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if (PyModule_AddIntMacro(m, LOCK_EX)) return -1;
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if (PyModule_AddIntMacro(m, LOCK_NB)) return -1;
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if (PyModule_AddIntMacro(m, 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 (PyModule_AddIntMacro(m, LOCK_MAND)) return -1;
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#endif
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#ifdef LOCK_READ
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if (PyModule_AddIntMacro(m, LOCK_READ)) return -1;
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#endif
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#ifdef LOCK_WRITE
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if (PyModule_AddIntMacro(m, LOCK_WRITE)) return -1;
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#endif
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#ifdef LOCK_RW
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if (PyModule_AddIntMacro(m, LOCK_RW)) return -1;
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#endif
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#ifdef F_DUPFD
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if (PyModule_AddIntMacro(m, F_DUPFD)) return -1;
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#endif
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#ifdef F_DUPFD_CLOEXEC
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if (PyModule_AddIntMacro(m, F_DUPFD_CLOEXEC)) return -1;
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#endif
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#ifdef F_GETFD
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if (PyModule_AddIntMacro(m, F_GETFD)) return -1;
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#endif
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#ifdef F_SETFD
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if (PyModule_AddIntMacro(m, F_SETFD)) return -1;
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#endif
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#ifdef F_GETFL
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if (PyModule_AddIntMacro(m, F_GETFL)) return -1;
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#endif
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#ifdef F_SETFL
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if (PyModule_AddIntMacro(m, F_SETFL)) return -1;
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#endif
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#ifdef F_GETLK
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if (PyModule_AddIntMacro(m, F_GETLK)) return -1;
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#endif
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#ifdef F_SETLK
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if (PyModule_AddIntMacro(m, F_SETLK)) return -1;
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#endif
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#ifdef F_SETLKW
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if (PyModule_AddIntMacro(m, F_SETLKW)) return -1;
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#endif
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#ifdef F_GETOWN
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if (PyModule_AddIntMacro(m, F_GETOWN)) return -1;
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#endif
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#ifdef F_SETOWN
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if (PyModule_AddIntMacro(m, F_SETOWN)) return -1;
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#endif
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#ifdef F_GETSIG
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if (PyModule_AddIntMacro(m, F_GETSIG)) return -1;
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#endif
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#ifdef F_SETSIG
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if (PyModule_AddIntMacro(m, F_SETSIG)) return -1;
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#endif
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#ifdef F_RDLCK
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if (PyModule_AddIntMacro(m, F_RDLCK)) return -1;
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#endif
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#ifdef F_WRLCK
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if (PyModule_AddIntMacro(m, F_WRLCK)) return -1;
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#endif
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#ifdef F_UNLCK
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if (PyModule_AddIntMacro(m, F_UNLCK)) return -1;
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#endif
|
|
/* LFS constants */
|
|
#ifdef F_GETLK64
|
|
if (PyModule_AddIntMacro(m, F_GETLK64)) return -1;
|
|
#endif
|
|
#ifdef F_SETLK64
|
|
if (PyModule_AddIntMacro(m, F_SETLK64)) return -1;
|
|
#endif
|
|
#ifdef F_SETLKW64
|
|
if (PyModule_AddIntMacro(m, F_SETLKW64)) return -1;
|
|
#endif
|
|
/* GNU extensions, as of glibc 2.2.4. */
|
|
#ifdef FASYNC
|
|
if (PyModule_AddIntMacro(m, FASYNC)) return -1;
|
|
#endif
|
|
#ifdef F_SETLEASE
|
|
if (PyModule_AddIntMacro(m, F_SETLEASE)) return -1;
|
|
#endif
|
|
#ifdef F_GETLEASE
|
|
if (PyModule_AddIntMacro(m, F_GETLEASE)) return -1;
|
|
#endif
|
|
#ifdef F_NOTIFY
|
|
if (PyModule_AddIntMacro(m, F_NOTIFY)) return -1;
|
|
#endif
|
|
/* Old BSD flock(). */
|
|
#ifdef F_EXLCK
|
|
if (PyModule_AddIntMacro(m, F_EXLCK)) return -1;
|
|
#endif
|
|
#ifdef F_SHLCK
|
|
if (PyModule_AddIntMacro(m, F_SHLCK)) return -1;
|
|
#endif
|
|
|
|
/* OS X specifics */
|
|
#ifdef F_FULLFSYNC
|
|
if (PyModule_AddIntMacro(m, F_FULLFSYNC)) return -1;
|
|
#endif
|
|
#ifdef F_NOCACHE
|
|
if (PyModule_AddIntMacro(m, F_NOCACHE)) return -1;
|
|
#endif
|
|
|
|
/* For F_{GET|SET}FL */
|
|
#ifdef FD_CLOEXEC
|
|
if (PyModule_AddIntMacro(m, FD_CLOEXEC)) return -1;
|
|
#endif
|
|
|
|
/* For F_NOTIFY */
|
|
#ifdef DN_ACCESS
|
|
if (PyModule_AddIntMacro(m, DN_ACCESS)) return -1;
|
|
#endif
|
|
#ifdef DN_MODIFY
|
|
if (PyModule_AddIntMacro(m, DN_MODIFY)) return -1;
|
|
#endif
|
|
#ifdef DN_CREATE
|
|
if (PyModule_AddIntMacro(m, DN_CREATE)) return -1;
|
|
#endif
|
|
#ifdef DN_DELETE
|
|
if (PyModule_AddIntMacro(m, DN_DELETE)) return -1;
|
|
#endif
|
|
#ifdef DN_RENAME
|
|
if (PyModule_AddIntMacro(m, DN_RENAME)) return -1;
|
|
#endif
|
|
#ifdef DN_ATTRIB
|
|
if (PyModule_AddIntMacro(m, DN_ATTRIB)) return -1;
|
|
#endif
|
|
#ifdef DN_MULTISHOT
|
|
if (PyModule_AddIntMacro(m, DN_MULTISHOT)) return -1;
|
|
#endif
|
|
|
|
#ifdef HAVE_STROPTS_H
|
|
/* Unix 98 guarantees that these are in stropts.h. */
|
|
if (PyModule_AddIntMacro(m, I_PUSH)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_POP)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_LOOK)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_FLUSH)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_FLUSHBAND)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_SETSIG)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_GETSIG)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_FIND)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_PEEK)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_SRDOPT)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_GRDOPT)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_NREAD)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_FDINSERT)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_STR)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_SWROPT)) return -1;
|
|
#ifdef I_GWROPT
|
|
/* despite the comment above, old-ish glibcs miss a couple... */
|
|
if (PyModule_AddIntMacro(m, I_GWROPT)) return -1;
|
|
#endif
|
|
if (PyModule_AddIntMacro(m, I_SENDFD)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_RECVFD)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_LIST)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_ATMARK)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_CKBAND)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_GETBAND)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_CANPUT)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_SETCLTIME)) return -1;
|
|
#ifdef I_GETCLTIME
|
|
if (PyModule_AddIntMacro(m, I_GETCLTIME)) return -1;
|
|
#endif
|
|
if (PyModule_AddIntMacro(m, I_LINK)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_UNLINK)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_PLINK)) return -1;
|
|
if (PyModule_AddIntMacro(m, I_PUNLINK)) return -1;
|
|
#endif
|
|
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct PyModuleDef fcntlmodule = {
|
|
PyModuleDef_HEAD_INIT,
|
|
"fcntl",
|
|
module_doc,
|
|
-1,
|
|
fcntl_methods,
|
|
NULL,
|
|
NULL,
|
|
NULL,
|
|
NULL
|
|
};
|
|
|
|
PyMODINIT_FUNC
|
|
PyInit_fcntl(void)
|
|
{
|
|
PyObject *m;
|
|
|
|
/* Create the module and add the functions and documentation */
|
|
m = PyModule_Create(&fcntlmodule);
|
|
if (m == NULL)
|
|
return NULL;
|
|
|
|
/* Add some symbolic constants to the module */
|
|
if (all_ins(m) < 0)
|
|
return NULL;
|
|
|
|
return m;
|
|
}
|