339 lines
8.0 KiB
C
339 lines
8.0 KiB
C
/***********************************************************
|
|
Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
|
|
The Netherlands.
|
|
|
|
All Rights Reserved
|
|
|
|
Permission to use, copy, modify, and distribute this software and its
|
|
documentation for any purpose and without fee is hereby granted,
|
|
provided that the above copyright notice appear in all copies and that
|
|
both that copyright notice and this permission notice appear in
|
|
supporting documentation, and that the names of Stichting Mathematisch
|
|
Centrum or CWI or Corporation for National Research Initiatives or
|
|
CNRI not be used in advertising or publicity pertaining to
|
|
distribution of the software without specific, written prior
|
|
permission.
|
|
|
|
While CWI is the initial source for this software, a modified version
|
|
is made available by the Corporation for National Research Initiatives
|
|
(CNRI) at the Internet address ftp://ftp.python.org.
|
|
|
|
STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
|
|
REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
|
|
MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
|
|
CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
|
|
DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
|
|
PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
|
|
TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
|
|
PERFORMANCE OF THIS SOFTWARE.
|
|
|
|
******************************************************************/
|
|
|
|
/* fcntl module */
|
|
|
|
#include "Python.h"
|
|
|
|
#ifdef HAVE_UNISTD_H
|
|
#include <unistd.h>
|
|
#endif
|
|
|
|
#ifdef HAVE_SYS_FILE_H
|
|
#include <sys/file.h>
|
|
#endif
|
|
|
|
#include <sys/ioctl.h>
|
|
#include <fcntl.h>
|
|
|
|
|
|
/* fcntl(fd, opt, [arg]) */
|
|
|
|
static PyObject *
|
|
fcntl_fcntl(self, args)
|
|
PyObject *self; /* Not used */
|
|
PyObject *args;
|
|
{
|
|
int fd;
|
|
int code;
|
|
int arg;
|
|
int ret;
|
|
char *str;
|
|
int len;
|
|
char buf[1024];
|
|
|
|
if (PyArg_Parse(args, "(iis#)", &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();
|
|
if (PyArg_Parse(args, "(ii)", &fd, &code))
|
|
arg = 0;
|
|
else {
|
|
PyErr_Clear();
|
|
if (!PyArg_Parse(args, "(iii)", &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);
|
|
}
|
|
|
|
static char 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. Typically these\n\
|
|
codes can be retrieved from the library module FCNTL. The argument arg\n\
|
|
is optional, and defaults to 0; it may be an int or a string.";
|
|
|
|
|
|
/* ioctl(fd, opt, [arg]) */
|
|
|
|
static PyObject *
|
|
fcntl_ioctl(self, args)
|
|
PyObject *self; /* Not used */
|
|
PyObject *args;
|
|
{
|
|
int fd;
|
|
int code;
|
|
int arg;
|
|
int ret;
|
|
char *str;
|
|
int len;
|
|
char buf[1024];
|
|
|
|
if (PyArg_Parse(args, "(iis#)", &fd, &code, &str, &len)) {
|
|
if (len > sizeof buf) {
|
|
PyErr_SetString(PyExc_ValueError,
|
|
"ioctl string arg too long");
|
|
return NULL;
|
|
}
|
|
memcpy(buf, str, len);
|
|
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();
|
|
if (PyArg_Parse(args, "(ii)", &fd, &code))
|
|
arg = 0;
|
|
else {
|
|
PyErr_Clear();
|
|
if (!PyArg_Parse(args, "(iii)", &fd, &code, &arg))
|
|
return NULL;
|
|
}
|
|
Py_BEGIN_ALLOW_THREADS
|
|
ret = ioctl(fd, code, arg);
|
|
Py_END_ALLOW_THREADS
|
|
if (ret < 0) {
|
|
PyErr_SetFromErrno(PyExc_IOError);
|
|
return NULL;
|
|
}
|
|
return PyInt_FromLong((long)ret);
|
|
}
|
|
|
|
static char ioctl_doc [] =
|
|
"ioctl(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. Typically these\n\
|
|
codes can be retrieved from the library module IOCTL. The argument arg\n\
|
|
is optional, and defaults to 0; it may be an int or a string.";
|
|
|
|
|
|
/* flock(fd, operation) */
|
|
|
|
static PyObject *
|
|
fcntl_flock(self, args)
|
|
PyObject *self; /* Not used */
|
|
PyObject *args;
|
|
{
|
|
int fd;
|
|
int code;
|
|
int ret;
|
|
|
|
if (!PyArg_Parse(args, "(ii)", &fd, &code))
|
|
return NULL;
|
|
|
|
Py_BEGIN_ALLOW_THREADS
|
|
#ifdef HAVE_FLOCK
|
|
ret = flock(fd, code);
|
|
#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;
|
|
ret = fcntl(fd, (code & LOCK_NB) ? F_SETLK : F_SETLKW, &l);
|
|
}
|
|
#endif /* HAVE_FLOCK */
|
|
Py_END_ALLOW_THREADS
|
|
if (ret < 0) {
|
|
PyErr_SetFromErrno(PyExc_IOError);
|
|
return NULL;
|
|
}
|
|
Py_INCREF(Py_None);
|
|
return Py_None;
|
|
}
|
|
|
|
static char flock_doc [] =
|
|
"flock(fd, operation)\n\
|
|
\n\
|
|
Perform the lock operation op on file descriptor fd. See the Unix \n\
|
|
manual flock(3) for details. (On some systems, this function is\n\
|
|
emulated using fcntl().)";
|
|
|
|
|
|
/* lockf(fd, operation) */
|
|
static PyObject *
|
|
fcntl_lockf(self, args)
|
|
PyObject *self; /* Not used */
|
|
PyObject *args;
|
|
{
|
|
int fd, code, len = 0, start = 0, whence = 0, ret;
|
|
|
|
if (!PyArg_ParseTuple(args, "ii|iii", &fd, &code, &len,
|
|
&start, &whence))
|
|
return NULL;
|
|
|
|
Py_BEGIN_ALLOW_THREADS
|
|
#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_len = len;
|
|
l.l_start = start;
|
|
l.l_whence = whence;
|
|
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;
|
|
}
|
|
|
|
static char lockf_doc [] =
|
|
"lockf (fd, operation)\n\
|
|
\n\
|
|
This is a wrapper around the FCNTL.F_SETLK and FCNTL.F_SETLKW fcntl()\n\
|
|
calls. See the Unix manual for details.";
|
|
|
|
/* List of functions */
|
|
|
|
static PyMethodDef fcntl_methods[] = {
|
|
{"fcntl", fcntl_fcntl, 0, fcntl_doc},
|
|
{"ioctl", fcntl_ioctl, 0, ioctl_doc},
|
|
{"flock", fcntl_flock, 0, flock_doc},
|
|
{"lockf", fcntl_lockf, 1, lockf_doc},
|
|
{NULL, NULL} /* sentinel */
|
|
};
|
|
|
|
|
|
static char 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(d, symbol, value)
|
|
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;
|
|
}
|
|
|
|
static int
|
|
all_ins(d)
|
|
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;
|
|
return 0;
|
|
}
|
|
|
|
DL_EXPORT(void)
|
|
initfcntl()
|
|
{
|
|
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);
|
|
|
|
/* Check for errors */
|
|
if (PyErr_Occurred())
|
|
Py_FatalError("can't initialize module fcntl");
|
|
}
|