| |
| /* 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 |
| |
| static int |
| conv_descriptor(PyObject *object, int *target) |
| { |
| int fd = PyObject_AsFileDescriptor(object); |
| |
| if (fd < 0) |
| return 0; |
| *target = fd; |
| return 1; |
| } |
| |
| |
| /* fcntl(fd, opt, [arg]) */ |
| |
| static PyObject * |
| fcntl_fcntl(PyObject *self, PyObject *args) |
| { |
| int fd; |
| int code; |
| long arg; |
| int ret; |
| char *str; |
| Py_ssize_t len; |
| char buf[1024]; |
| |
| if (PyArg_ParseTuple(args, "O&is#:fcntl", |
| conv_descriptor, &fd, &code, &str, &len)) { |
| if (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 PyString_FromStringAndSize(buf, len); |
| } |
| |
| PyErr_Clear(); |
| arg = 0; |
| if (!PyArg_ParseTuple(args, |
| "O&i|l;fcntl requires a file or file descriptor," |
| " an integer and optionally a third integer or a string", |
| conv_descriptor, &fd, &code, &arg)) { |
| return NULL; |
| } |
| Py_BEGIN_ALLOW_THREADS |
| ret = fcntl(fd, code, arg); |
| Py_END_ALLOW_THREADS |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| return PyInt_FromLong((long)ret); |
| } |
| |
| PyDoc_STRVAR(fcntl_doc, |
| "fcntl(fd, opt, [arg])\n\ |
| \n\ |
| Perform the requested operation on file descriptor fd. The operation\n\ |
| is defined by op and is operating system dependent. These constants are\n\ |
| available from the fcntl module. The argument arg is optional, and\n\ |
| defaults to 0; it may be an int or a string. If arg is given as a string,\n\ |
| the return value of fcntl is a string of that length, containing the\n\ |
| resulting value put in the arg buffer by the operating system. The length\n\ |
| of the arg string is not allowed to exceed 1024 bytes. If the arg given\n\ |
| is an integer or if none is specified, the result value is an integer\n\ |
| corresponding to the return value of the fcntl call in the C code."); |
| |
| |
| /* ioctl(fd, opt, [arg]) */ |
| |
| static PyObject * |
| fcntl_ioctl(PyObject *self, PyObject *args) |
| { |
| #define IOCTL_BUFSZ 1024 |
| int fd; |
| /* In PyArg_ParseTuple below, we use the unsigned non-checked 'I' |
| format for the 'code' parameter because Python turns 0x8000000 |
| into either a large positive number (PyLong or PyInt on 64-bit |
| platforms) or a negative number on others (32-bit PyInt) |
| whereas 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 thise. |
| |
| 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. |
| */ |
| unsigned int code; |
| int arg; |
| int ret; |
| char *str; |
| Py_ssize_t len; |
| int mutate_arg = 1; |
| char buf[IOCTL_BUFSZ+1]; /* argument plus NUL byte */ |
| |
| if (PyArg_ParseTuple(args, "O&Iw#|i:ioctl", |
| conv_descriptor, &fd, &code, |
| &str, &len, &mutate_arg)) { |
| char *arg; |
| |
| if (mutate_arg) { |
| if (len <= IOCTL_BUFSZ) { |
| memcpy(buf, str, len); |
| buf[len] = '\0'; |
| arg = buf; |
| } |
| else { |
| arg = str; |
| } |
| } |
| else { |
| if (len > IOCTL_BUFSZ) { |
| 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); |
| } |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| if (mutate_arg) { |
| return PyInt_FromLong(ret); |
| } |
| else { |
| return PyString_FromStringAndSize(buf, len); |
| } |
| } |
| |
| PyErr_Clear(); |
| if (PyArg_ParseTuple(args, "O&Is#:ioctl", |
| conv_descriptor, &fd, &code, &str, &len)) { |
| if (len > IOCTL_BUFSZ) { |
| 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) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| return PyString_FromStringAndSize(buf, len); |
| } |
| |
| PyErr_Clear(); |
| arg = 0; |
| if (!PyArg_ParseTuple(args, |
| "O&I|i;ioctl requires a file or file descriptor," |
| " an integer and optionally an integer or buffer argument", |
| conv_descriptor, &fd, &code, &arg)) { |
| return NULL; |
| } |
| Py_BEGIN_ALLOW_THREADS |
| #ifdef __VMS |
| ret = ioctl(fd, code, (void *)arg); |
| #else |
| ret = ioctl(fd, code, arg); |
| #endif |
| Py_END_ALLOW_THREADS |
| if (ret < 0) { |
| PyErr_SetFromErrno(PyExc_IOError); |
| return NULL; |
| } |
| return PyInt_FromLong((long)ret); |
| #undef IOCTL_BUFSZ |
| } |
| |
| PyDoc_STRVAR(ioctl_doc, |
| "ioctl(fd, opt[, arg[, mutate_flag]])\n\ |
| \n\ |
| Perform the requested operation on file descriptor fd. The operation is\n\ |
| defined by opt and is operating system dependent. Typically these codes are\n\ |
| retrieved from the fcntl or termios library modules.\n\ |
| \n\ |
| The argument arg is optional, and defaults to 0; it may be an int or a\n\ |
| buffer containing character data (most likely a string or an array). \n\ |
| \n\ |
| If the argument is a mutable buffer (such as an array) and if the\n\ |
| mutate_flag argument (which is only allowed in this case) is true then the\n\ |
| buffer is (in effect) passed to the operating system and changes made by\n\ |
| the OS will be reflected in the contents of the buffer after the call has\n\ |
| returned. The return value is the integer returned by the ioctl system\n\ |
| call.\n\ |
| \n\ |
| If the argument is a mutable buffer and the mutable_flag argument is not\n\ |
| passed or is false, the behavior is as if a string had been passed. This\n\ |
| behavior will change in future releases of Python.\n\ |
| \n\ |
| If the argument is an immutable buffer (most likely a string) then a copy\n\ |
| of the buffer is passed to the operating system and the return value is a\n\ |
| string of the same length containing whatever the operating system put in\n\ |
| the buffer. The length of the arg buffer in this case is not allowed to\n\ |
| exceed 1024 bytes.\n\ |
| \n\ |
| If the arg given is an integer or if none is specified, the result value is\n\ |
| an integer corresponding to the return value of the ioctl call in the C\n\ |
| code."); |
| |
| |
| /* flock(fd, operation) */ |
| |
| static PyObject * |
| fcntl_flock(PyObject *self, PyObject *args) |
| { |
| int fd; |
| int code; |
| int ret; |
| |
| if (!PyArg_ParseTuple(args, "O&i:flock", |
| conv_descriptor, &fd, &code)) |
| return NULL; |
| |
| #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_INCREF(Py_None); |
| return Py_None; |
| } |
| |
| PyDoc_STRVAR(flock_doc, |
| "flock(fd, operation)\n\ |
| \n\ |
| Perform the lock operation op on file descriptor fd. See the Unix \n\ |
| manual page for flock(3) for details. (On some systems, this function is\n\ |
| emulated using fcntl().)"); |
| |
| |
| /* lockf(fd, operation) */ |
| static PyObject * |
| fcntl_lockf(PyObject *self, PyObject *args) |
| { |
| int fd, code, ret, whence = 0; |
| PyObject *lenobj = NULL, *startobj = NULL; |
| |
| if (!PyArg_ParseTuple(args, "O&i|OOi:lockf", |
| conv_descriptor, &fd, &code, |
| &lenobj, &startobj, &whence)) |
| return NULL; |
| |
| #if defined(PYOS_OS2) && defined(PYCC_GCC) |
| PyErr_SetString(PyExc_NotImplementedError, |
| "lockf not supported on OS/2 (EMX)"); |
| return NULL; |
| #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 /* 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 = PyInt_AsLong(startobj); |
| #else |
| l.l_start = PyLong_Check(startobj) ? |
| PyLong_AsLongLong(startobj) : |
| PyInt_AsLong(startobj); |
| #endif |
| if (PyErr_Occurred()) |
| return NULL; |
| } |
| if (lenobj != NULL) { |
| #if !defined(HAVE_LARGEFILE_SUPPORT) |
| l.l_len = PyInt_AsLong(lenobj); |
| #else |
| l.l_len = PyLong_Check(lenobj) ? |
| PyLong_AsLongLong(lenobj) : |
| PyInt_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_INCREF(Py_None); |
| return Py_None; |
| #endif /* defined(PYOS_OS2) && defined(PYCC_GCC) */ |
| } |
| |
| PyDoc_STRVAR(lockf_doc, |
| "lockf (fd, operation, length=0, start=0, whence=0)\n\ |
| \n\ |
| This is essentially a wrapper around the fcntl() locking calls. fd is the\n\ |
| file descriptor of the file to lock or unlock, and operation is one of the\n\ |
| following values:\n\ |
| \n\ |
| LOCK_UN - unlock\n\ |
| LOCK_SH - acquire a shared lock\n\ |
| LOCK_EX - acquire an exclusive lock\n\ |
| \n\ |
| When operation is LOCK_SH or LOCK_EX, it can also be bitwise ORed with\n\ |
| LOCK_NB to avoid blocking on lock acquisition. If LOCK_NB is used and the\n\ |
| lock cannot be acquired, an IOError will be raised and the exception will\n\ |
| have an errno attribute set to EACCES or EAGAIN (depending on the operating\n\ |
| system -- for portability, check for either value).\n\ |
| \n\ |
| length is the number of bytes to lock, with the default meaning to lock to\n\ |
| EOF. start is the byte offset, relative to whence, to that the lock\n\ |
| starts. whence is as with fileobj.seek(), specifically:\n\ |
| \n\ |
| 0 - relative to the start of the file (SEEK_SET)\n\ |
| 1 - relative to the current buffer position (SEEK_CUR)\n\ |
| 2 - relative to the end of the file (SEEK_END)"); |
| |
| /* List of functions */ |
| |
| static PyMethodDef fcntl_methods[] = { |
| {"fcntl", fcntl_fcntl, METH_VARARGS, fcntl_doc}, |
| {"ioctl", fcntl_ioctl, METH_VARARGS, ioctl_doc}, |
| {"flock", fcntl_flock, METH_VARARGS, flock_doc}, |
| {"lockf", fcntl_lockf, METH_VARARGS, lockf_doc}, |
| {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 |
| ins(PyObject* d, char* symbol, long value) |
| { |
| PyObject* v = PyInt_FromLong(value); |
| if (!v || PyDict_SetItemString(d, symbol, v) < 0) |
| return -1; |
| |
| Py_DECREF(v); |
| return 0; |
| } |
| |
| #define INS(x) if (ins(d, #x, (long)x)) return -1 |
| |
| static int |
| all_ins(PyObject* d) |
| { |
| if (ins(d, "LOCK_SH", (long)LOCK_SH)) return -1; |
| if (ins(d, "LOCK_EX", (long)LOCK_EX)) return -1; |
| if (ins(d, "LOCK_NB", (long)LOCK_NB)) return -1; |
| if (ins(d, "LOCK_UN", (long)LOCK_UN)) return -1; |
| /* GNU extensions, as of glibc 2.2.4 */ |
| #ifdef LOCK_MAND |
| if (ins(d, "LOCK_MAND", (long)LOCK_MAND)) return -1; |
| #endif |
| #ifdef LOCK_READ |
| if (ins(d, "LOCK_READ", (long)LOCK_READ)) return -1; |
| #endif |
| #ifdef LOCK_WRITE |
| if (ins(d, "LOCK_WRITE", (long)LOCK_WRITE)) return -1; |
| #endif |
| #ifdef LOCK_RW |
| if (ins(d, "LOCK_RW", (long)LOCK_RW)) return -1; |
| #endif |
| |
| #ifdef F_DUPFD |
| if (ins(d, "F_DUPFD", (long)F_DUPFD)) return -1; |
| #endif |
| #ifdef F_GETFD |
| if (ins(d, "F_GETFD", (long)F_GETFD)) return -1; |
| #endif |
| #ifdef F_SETFD |
| if (ins(d, "F_SETFD", (long)F_SETFD)) return -1; |
| #endif |
| #ifdef F_GETFL |
| if (ins(d, "F_GETFL", (long)F_GETFL)) return -1; |
| #endif |
| #ifdef F_SETFL |
| if (ins(d, "F_SETFL", (long)F_SETFL)) return -1; |
| #endif |
| #ifdef F_GETLK |
| if (ins(d, "F_GETLK", (long)F_GETLK)) return -1; |
| #endif |
| #ifdef F_SETLK |
| if (ins(d, "F_SETLK", (long)F_SETLK)) return -1; |
| #endif |
| #ifdef F_SETLKW |
| if (ins(d, "F_SETLKW", (long)F_SETLKW)) return -1; |
| #endif |
| #ifdef F_GETOWN |
| if (ins(d, "F_GETOWN", (long)F_GETOWN)) return -1; |
| #endif |
| #ifdef F_SETOWN |
| if (ins(d, "F_SETOWN", (long)F_SETOWN)) return -1; |
| #endif |
| #ifdef F_GETSIG |
| if (ins(d, "F_GETSIG", (long)F_GETSIG)) return -1; |
| #endif |
| #ifdef F_SETSIG |
| if (ins(d, "F_SETSIG", (long)F_SETSIG)) return -1; |
| #endif |
| #ifdef F_RDLCK |
| if (ins(d, "F_RDLCK", (long)F_RDLCK)) return -1; |
| #endif |
| #ifdef F_WRLCK |
| if (ins(d, "F_WRLCK", (long)F_WRLCK)) return -1; |
| #endif |
| #ifdef F_UNLCK |
| if (ins(d, "F_UNLCK", (long)F_UNLCK)) return -1; |
| #endif |
| /* LFS constants */ |
| #ifdef F_GETLK64 |
| if (ins(d, "F_GETLK64", (long)F_GETLK64)) return -1; |
| #endif |
| #ifdef F_SETLK64 |
| if (ins(d, "F_SETLK64", (long)F_SETLK64)) return -1; |
| #endif |
| #ifdef F_SETLKW64 |
| if (ins(d, "F_SETLKW64", (long)F_SETLKW64)) return -1; |
| #endif |
| /* GNU extensions, as of glibc 2.2.4. */ |
| #ifdef FASYNC |
| if (ins(d, "FASYNC", (long)FASYNC)) return -1; |
| #endif |
| #ifdef F_SETLEASE |
| if (ins(d, "F_SETLEASE", (long)F_SETLEASE)) return -1; |
| #endif |
| #ifdef F_GETLEASE |
| if (ins(d, "F_GETLEASE", (long)F_GETLEASE)) return -1; |
| #endif |
| #ifdef F_NOTIFY |
| if (ins(d, "F_NOTIFY", (long)F_NOTIFY)) return -1; |
| #endif |
| /* Old BSD flock(). */ |
| #ifdef F_EXLCK |
| if (ins(d, "F_EXLCK", (long)F_EXLCK)) return -1; |
| #endif |
| #ifdef F_SHLCK |
| if (ins(d, "F_SHLCK", (long)F_SHLCK)) return -1; |
| #endif |
| |
| /* OS X (and maybe others) let you tell the storage device to flush to physical media */ |
| #ifdef F_FULLFSYNC |
| if (ins(d, "F_FULLFSYNC", (long)F_FULLFSYNC)) return -1; |
| #endif |
| |
| /* For F_{GET|SET}FL */ |
| #ifdef FD_CLOEXEC |
| if (ins(d, "FD_CLOEXEC", (long)FD_CLOEXEC)) return -1; |
| #endif |
| |
| /* For F_NOTIFY */ |
| #ifdef DN_ACCESS |
| if (ins(d, "DN_ACCESS", (long)DN_ACCESS)) return -1; |
| #endif |
| #ifdef DN_MODIFY |
| if (ins(d, "DN_MODIFY", (long)DN_MODIFY)) return -1; |
| #endif |
| #ifdef DN_CREATE |
| if (ins(d, "DN_CREATE", (long)DN_CREATE)) return -1; |
| #endif |
| #ifdef DN_DELETE |
| if (ins(d, "DN_DELETE", (long)DN_DELETE)) return -1; |
| #endif |
| #ifdef DN_RENAME |
| if (ins(d, "DN_RENAME", (long)DN_RENAME)) return -1; |
| #endif |
| #ifdef DN_ATTRIB |
| if (ins(d, "DN_ATTRIB", (long)DN_ATTRIB)) return -1; |
| #endif |
| #ifdef DN_MULTISHOT |
| if (ins(d, "DN_MULTISHOT", (long)DN_MULTISHOT)) return -1; |
| #endif |
| |
| #ifdef HAVE_STROPTS_H |
| /* Unix 98 guarantees that these are in stropts.h. */ |
| INS(I_PUSH); |
| INS(I_POP); |
| INS(I_LOOK); |
| INS(I_FLUSH); |
| INS(I_FLUSHBAND); |
| INS(I_SETSIG); |
| INS(I_GETSIG); |
| INS(I_FIND); |
| INS(I_PEEK); |
| INS(I_SRDOPT); |
| INS(I_GRDOPT); |
| INS(I_NREAD); |
| INS(I_FDINSERT); |
| INS(I_STR); |
| INS(I_SWROPT); |
| #ifdef I_GWROPT |
| /* despite the comment above, old-ish glibcs miss a couple... */ |
| INS(I_GWROPT); |
| #endif |
| INS(I_SENDFD); |
| INS(I_RECVFD); |
| INS(I_LIST); |
| INS(I_ATMARK); |
| INS(I_CKBAND); |
| INS(I_GETBAND); |
| INS(I_CANPUT); |
| INS(I_SETCLTIME); |
| #ifdef I_GETCLTIME |
| INS(I_GETCLTIME); |
| #endif |
| INS(I_LINK); |
| INS(I_UNLINK); |
| INS(I_PLINK); |
| INS(I_PUNLINK); |
| #endif |
| |
| return 0; |
| } |
| |
| PyMODINIT_FUNC |
| initfcntl(void) |
| { |
| PyObject *m, *d; |
| |
| /* Create the module and add the functions and documentation */ |
| m = Py_InitModule3("fcntl", fcntl_methods, module_doc); |
| if (m == NULL) |
| return; |
| |
| /* Add some symbolic constants to the module */ |
| d = PyModule_GetDict(m); |
| all_ins(d); |
| } |