| |
| /* fcntl module */ |
| |
| #define PY_SSIZE_T_CLEAN |
| |
| #include "Python.h" |
| |
| #ifdef HAVE_SYS_FILE_H |
| #include <sys/file.h> |
| #endif |
| |
| #include <sys/ioctl.h> |
| #include <fcntl.h> |
| #ifdef HAVE_STROPTS_H |
| #include <stropts.h> |
| #endif |
| |
| /*[clinic input] |
| output preset file |
| module fcntl |
| [clinic start generated code]*/ |
| /*[clinic end generated code: output=da39a3ee5e6b4b0d input=c7356fdb126a904a]*/ |
| |
| static int |
| conv_descriptor(PyObject *object, int *target) |
| { |
| int fd = PyObject_AsFileDescriptor(object); |
| |
| if (fd < 0) |
| return 0; |
| *target = fd; |
| return 1; |
| } |
| |
| /* Must come after conv_descriptor definition. */ |
| #include "clinic/fcntlmodule.c.h" |
| |
| /*[clinic input] |
| fcntl.fcntl |
| |
| fd: object(type='int', converter='conv_descriptor') |
| cmd as code: int |
| arg: object(c_default='NULL') = 0 |
| / |
| |
| Perform the operation `cmd` on file descriptor fd. |
| |
| The values used for `cmd` are operating system dependent, and are available |
| as constants in the fcntl module, using the same names as used in |
| the relevant C header files. The argument arg is optional, and |
| defaults to 0; it may be an int or a string. If arg is given as a string, |
| the return value of fcntl is a string of that length, containing the |
| resulting value put in the arg buffer by the operating system. The length |
| of the arg string is not allowed to exceed 1024 bytes. If the arg given |
| is an integer or if none is specified, the result value is an integer |
| corresponding to the return value of the fcntl call in the C code. |
| [clinic start generated code]*/ |
| |
| static PyObject * |
| fcntl_fcntl_impl(PyModuleDef *module, int fd, int code, PyObject *arg) |
| /*[clinic end generated code: output=afc5bfa74a03ef0d input=8cefbe59b29efbe2]*/ |
| { |
| unsigned int int_arg = 0; |
| int ret; |
| char *str; |
| Py_ssize_t len; |
| char buf[1024]; |
| |
| if (arg != NULL) { |
| int parse_result; |
| |
| if (PyArg_Parse(arg, "s#", &str, &len)) { |
| if ((size_t)len > sizeof buf) { |
| PyErr_SetString(PyExc_ValueError, |
| "fcntl string arg too long"); |
| return NULL; |
| } |
| memcpy(buf, str, len); |
| Py_BEGIN_ALLOW_THREADS |
| ret = fcntl(fd, code, buf); |
| Py_END_ALLOW_THREADS |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| return PyBytes_FromStringAndSize(buf, len); |
| } |
| |
| PyErr_Clear(); |
| parse_result = PyArg_Parse(arg, |
| "I;fcntl requires a file or file descriptor," |
| " an integer and optionally a third integer or a string", |
| &int_arg); |
| if (!parse_result) { |
| return NULL; |
| } |
| } |
| |
| Py_BEGIN_ALLOW_THREADS |
| ret = fcntl(fd, code, (int)int_arg); |
| Py_END_ALLOW_THREADS |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| return PyLong_FromLong((long)ret); |
| } |
| |
| |
| /*[clinic input] |
| fcntl.ioctl |
| |
| fd: object(type='int', converter='conv_descriptor') |
| request as code: unsigned_int(bitwise=True) |
| arg as ob_arg: object(c_default='NULL') = 0 |
| mutate_flag as mutate_arg: bool = True |
| / |
| |
| Perform the operation `request` on file descriptor `fd`. |
| |
| The values used for `request` are operating system dependent, and are available |
| as constants in the fcntl or termios library modules, using the same names as |
| used in the relevant C header files. |
| |
| The argument `arg` is optional, and defaults to 0; it may be an int or a |
| buffer containing character data (most likely a string or an array). |
| |
| If the argument is a mutable buffer (such as an array) and if the |
| mutate_flag argument (which is only allowed in this case) is true then the |
| buffer is (in effect) passed to the operating system and changes made by |
| the OS will be reflected in the contents of the buffer after the call has |
| returned. The return value is the integer returned by the ioctl system |
| call. |
| |
| If the argument is a mutable buffer and the mutable_flag argument is false, |
| the behavior is as if a string had been passed. |
| |
| If the argument is an immutable buffer (most likely a string) then a copy |
| of the buffer is passed to the operating system and the return value is a |
| string of the same length containing whatever the operating system put in |
| the buffer. The length of the arg buffer in this case is not allowed to |
| exceed 1024 bytes. |
| |
| If the arg given is an integer or if none is specified, the result value is |
| an integer corresponding to the return value of the ioctl call in the C |
| code. |
| [clinic start generated code]*/ |
| |
| static PyObject * |
| fcntl_ioctl_impl(PyModuleDef *module, int fd, unsigned int code, PyObject *ob_arg, int mutate_arg) |
| /*[clinic end generated code: output=ad47738c118622bf input=ede70c433cccbbb2]*/ |
| { |
| #define IOCTL_BUFSZ 1024 |
| /* We use the unsigned non-checked 'I' format for the 'code' parameter |
| because the system expects it to be a 32bit bit field value |
| regardless of it being passed as an int or unsigned long on |
| various platforms. See the termios.TIOCSWINSZ constant across |
| platforms for an example of this. |
| |
| If any of the 64bit platforms ever decide to use more than 32bits |
| in their unsigned long ioctl codes this will break and need |
| special casing based on the platform being built on. |
| */ |
| int arg = 0; |
| int ret; |
| Py_buffer pstr; |
| char *str; |
| Py_ssize_t len; |
| char buf[IOCTL_BUFSZ+1]; /* argument plus NUL byte */ |
| |
| if (ob_arg != NULL) { |
| if (PyArg_Parse(ob_arg, "w*:ioctl", &pstr)) { |
| char *arg; |
| str = pstr.buf; |
| len = pstr.len; |
| |
| if (mutate_arg) { |
| if (len <= IOCTL_BUFSZ) { |
| memcpy(buf, str, len); |
| buf[len] = '\0'; |
| arg = buf; |
| } |
| else { |
| arg = str; |
| } |
| } |
| else { |
| if (len > IOCTL_BUFSZ) { |
| PyBuffer_Release(&pstr); |
| PyErr_SetString(PyExc_ValueError, |
| "ioctl string arg too long"); |
| return NULL; |
| } |
| else { |
| memcpy(buf, str, len); |
| buf[len] = '\0'; |
| arg = buf; |
| } |
| } |
| if (buf == arg) { |
| Py_BEGIN_ALLOW_THREADS /* think array.resize() */ |
| ret = ioctl(fd, code, arg); |
| Py_END_ALLOW_THREADS |
| } |
| else { |
| ret = ioctl(fd, code, arg); |
| } |
| if (mutate_arg && (len <= IOCTL_BUFSZ)) { |
| memcpy(str, buf, len); |
| } |
| PyBuffer_Release(&pstr); /* No further access to str below this point */ |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| if (mutate_arg) { |
| return PyLong_FromLong(ret); |
| } |
| else { |
| return PyBytes_FromStringAndSize(buf, len); |
| } |
| } |
| |
| PyErr_Clear(); |
| if (PyArg_Parse(ob_arg, "s*:ioctl", &pstr)) { |
| str = pstr.buf; |
| len = pstr.len; |
| if (len > IOCTL_BUFSZ) { |
| PyBuffer_Release(&pstr); |
| PyErr_SetString(PyExc_ValueError, |
| "ioctl string arg too long"); |
| return NULL; |
| } |
| memcpy(buf, str, len); |
| buf[len] = '\0'; |
| Py_BEGIN_ALLOW_THREADS |
| ret = ioctl(fd, code, buf); |
| Py_END_ALLOW_THREADS |
| if (ret < 0) { |
| PyBuffer_Release(&pstr); |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| PyBuffer_Release(&pstr); |
| return PyBytes_FromStringAndSize(buf, len); |
| } |
| |
| PyErr_Clear(); |
| if (!PyArg_Parse(ob_arg, |
| "i;ioctl requires a file or file descriptor," |
| " an integer and optionally an integer or buffer argument", |
| &arg)) { |
| return NULL; |
| } |
| // Fall-through to outside the 'if' statement. |
| } |
| Py_BEGIN_ALLOW_THREADS |
| ret = ioctl(fd, code, arg); |
| Py_END_ALLOW_THREADS |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| return PyLong_FromLong((long)ret); |
| #undef IOCTL_BUFSZ |
| } |
| |
| /*[clinic input] |
| fcntl.flock |
| |
| fd: object(type='int', converter='conv_descriptor') |
| operation as code: int |
| / |
| |
| Perform the lock operation `operation` on file descriptor `fd`. |
| |
| See the Unix manual page for flock(2) for details (On some systems, this |
| function is emulated using fcntl()). |
| [clinic start generated code]*/ |
| |
| static PyObject * |
| fcntl_flock_impl(PyModuleDef *module, int fd, int code) |
| /*[clinic end generated code: output=c9035133a7dbfc96 input=b70a0a41ca22a8a0]*/ |
| { |
| int ret; |
| |
| #ifdef HAVE_FLOCK |
| Py_BEGIN_ALLOW_THREADS |
| ret = flock(fd, code); |
| Py_END_ALLOW_THREADS |
| #else |
| |
| #ifndef LOCK_SH |
| #define LOCK_SH 1 /* shared lock */ |
| #define LOCK_EX 2 /* exclusive lock */ |
| #define LOCK_NB 4 /* don't block when locking */ |
| #define LOCK_UN 8 /* unlock */ |
| #endif |
| { |
| struct flock l; |
| if (code == LOCK_UN) |
| l.l_type = F_UNLCK; |
| else if (code & LOCK_SH) |
| l.l_type = F_RDLCK; |
| else if (code & LOCK_EX) |
| l.l_type = F_WRLCK; |
| else { |
| PyErr_SetString(PyExc_ValueError, |
| "unrecognized flock argument"); |
| return NULL; |
| } |
| l.l_whence = l.l_start = l.l_len = 0; |
| Py_BEGIN_ALLOW_THREADS |
| ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l); |
| Py_END_ALLOW_THREADS |
| } |
| #endif /* HAVE_FLOCK */ |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| Py_RETURN_NONE; |
| } |
| |
| |
| /*[clinic input] |
| fcntl.lockf |
| |
| fd: object(type='int', converter='conv_descriptor') |
| cmd as code: int |
| len as lenobj: object(c_default='NULL') = 0 |
| start as startobj: object(c_default='NULL') = 0 |
| whence: int = 0 |
| / |
| |
| A wrapper around the fcntl() locking calls. |
| |
| `fd` is the file descriptor of the file to lock or unlock, and operation is one |
| of the following values: |
| |
| LOCK_UN - unlock |
| LOCK_SH - acquire a shared lock |
| LOCK_EX - acquire an exclusive lock |
| |
| When operation is LOCK_SH or LOCK_EX, it can also be bitwise ORed with |
| LOCK_NB to avoid blocking on lock acquisition. If LOCK_NB is used and the |
| lock cannot be acquired, an IOError will be raised and the exception will |
| have an errno attribute set to EACCES or EAGAIN (depending on the operating |
| system -- for portability, check for either value). |
| |
| `len` is the number of bytes to lock, with the default meaning to lock to |
| EOF. `start` is the byte offset, relative to `whence`, to that the lock |
| starts. `whence` is as with fileobj.seek(), specifically: |
| |
| 0 - relative to the start of the file (SEEK_SET) |
| 1 - relative to the current buffer position (SEEK_CUR) |
| 2 - relative to the end of the file (SEEK_END) |
| [clinic start generated code]*/ |
| |
| static PyObject * |
| fcntl_lockf_impl(PyModuleDef *module, int fd, int code, PyObject *lenobj, PyObject *startobj, int whence) |
| /*[clinic end generated code: output=5536df2892bf3ce9 input=9c594391de821f24]*/ |
| { |
| int ret; |
| |
| #ifndef LOCK_SH |
| #define LOCK_SH 1 /* shared lock */ |
| #define LOCK_EX 2 /* exclusive lock */ |
| #define LOCK_NB 4 /* don't block when locking */ |
| #define LOCK_UN 8 /* unlock */ |
| #endif /* LOCK_SH */ |
| { |
| struct flock l; |
| if (code == LOCK_UN) |
| l.l_type = F_UNLCK; |
| else if (code & LOCK_SH) |
| l.l_type = F_RDLCK; |
| else if (code & LOCK_EX) |
| l.l_type = F_WRLCK; |
| else { |
| PyErr_SetString(PyExc_ValueError, |
| "unrecognized lockf argument"); |
| return NULL; |
| } |
| l.l_start = l.l_len = 0; |
| if (startobj != NULL) { |
| #if !defined(HAVE_LARGEFILE_SUPPORT) |
| l.l_start = PyLong_AsLong(startobj); |
| #else |
| l.l_start = PyLong_Check(startobj) ? |
| PyLong_AsLongLong(startobj) : |
| PyLong_AsLong(startobj); |
| #endif |
| if (PyErr_Occurred()) |
| return NULL; |
| } |
| if (lenobj != NULL) { |
| #if !defined(HAVE_LARGEFILE_SUPPORT) |
| l.l_len = PyLong_AsLong(lenobj); |
| #else |
| l.l_len = PyLong_Check(lenobj) ? |
| PyLong_AsLongLong(lenobj) : |
| PyLong_AsLong(lenobj); |
| #endif |
| if (PyErr_Occurred()) |
| return NULL; |
| } |
| l.l_whence = whence; |
| Py_BEGIN_ALLOW_THREADS |
| ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l); |
| Py_END_ALLOW_THREADS |
| } |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| Py_RETURN_NONE; |
| } |
| |
| /* List of functions */ |
| |
| static PyMethodDef fcntl_methods[] = { |
| FCNTL_FCNTL_METHODDEF |
| FCNTL_IOCTL_METHODDEF |
| FCNTL_FLOCK_METHODDEF |
| FCNTL_LOCKF_METHODDEF |
| {NULL, NULL} /* sentinel */ |
| }; |
| |
| |
| PyDoc_STRVAR(module_doc, |
| "This module performs file control and I/O control on file \n\ |
| descriptors. It is an interface to the fcntl() and ioctl() Unix\n\ |
| routines. File descriptors can be obtained with the fileno() method of\n\ |
| a file or socket object."); |
| |
| /* Module initialisation */ |
| |
| |
| static int |
| all_ins(PyObject* m) |
| { |
| if (PyModule_AddIntMacro(m, LOCK_SH)) return -1; |
| if (PyModule_AddIntMacro(m, LOCK_EX)) return -1; |
| if (PyModule_AddIntMacro(m, LOCK_NB)) return -1; |
| if (PyModule_AddIntMacro(m, LOCK_UN)) return -1; |
| /* GNU extensions, as of glibc 2.2.4 */ |
| #ifdef LOCK_MAND |
| if (PyModule_AddIntMacro(m, LOCK_MAND)) return -1; |
| #endif |
| #ifdef LOCK_READ |
| if (PyModule_AddIntMacro(m, LOCK_READ)) return -1; |
| #endif |
| #ifdef LOCK_WRITE |
| if (PyModule_AddIntMacro(m, LOCK_WRITE)) return -1; |
| #endif |
| #ifdef LOCK_RW |
| if (PyModule_AddIntMacro(m, LOCK_RW)) return -1; |
| #endif |
| |
| #ifdef F_DUPFD |
| if (PyModule_AddIntMacro(m, F_DUPFD)) return -1; |
| #endif |
| #ifdef F_DUPFD_CLOEXEC |
| if (PyModule_AddIntMacro(m, F_DUPFD_CLOEXEC)) return -1; |
| #endif |
| #ifdef F_GETFD |
| if (PyModule_AddIntMacro(m, F_GETFD)) return -1; |
| #endif |
| #ifdef F_SETFD |
| if (PyModule_AddIntMacro(m, F_SETFD)) return -1; |
| #endif |
| #ifdef F_GETFL |
| if (PyModule_AddIntMacro(m, F_GETFL)) return -1; |
| #endif |
| #ifdef F_SETFL |
| if (PyModule_AddIntMacro(m, F_SETFL)) return -1; |
| #endif |
| #ifdef F_GETLK |
| if (PyModule_AddIntMacro(m, F_GETLK)) return -1; |
| #endif |
| #ifdef F_SETLK |
| if (PyModule_AddIntMacro(m, F_SETLK)) return -1; |
| #endif |
| #ifdef F_SETLKW |
| if (PyModule_AddIntMacro(m, F_SETLKW)) return -1; |
| #endif |
| #ifdef F_GETOWN |
| if (PyModule_AddIntMacro(m, F_GETOWN)) return -1; |
| #endif |
| #ifdef F_SETOWN |
| if (PyModule_AddIntMacro(m, F_SETOWN)) return -1; |
| #endif |
| #ifdef F_GETSIG |
| if (PyModule_AddIntMacro(m, F_GETSIG)) return -1; |
| #endif |
| #ifdef F_SETSIG |
| if (PyModule_AddIntMacro(m, F_SETSIG)) return -1; |
| #endif |
| #ifdef F_RDLCK |
| if (PyModule_AddIntMacro(m, F_RDLCK)) return -1; |
| #endif |
| #ifdef F_WRLCK |
| if (PyModule_AddIntMacro(m, F_WRLCK)) return -1; |
| #endif |
| #ifdef F_UNLCK |
| if (PyModule_AddIntMacro(m, F_UNLCK)) return -1; |
| #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; |
| } |