1992-06-23 09:07:03 +00:00
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/***********************************************************
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1995-01-04 19:10:35 +00:00
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Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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The Netherlands.
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1992-06-23 09:07:03 +00:00
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All Rights Reserved
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1996-10-25 14:44:06 +00:00
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Permission to use, copy, modify, and distribute this software and its
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documentation for any purpose and without fee is hereby granted,
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1992-06-23 09:07:03 +00:00
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provided that the above copyright notice appear in all copies and that
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1996-10-25 14:44:06 +00:00
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both that copyright notice and this permission notice appear in
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1992-06-23 09:07:03 +00:00
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supporting documentation, and that the names of Stichting Mathematisch
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1996-10-25 14:44:06 +00:00
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Centrum or CWI or Corporation for National Research Initiatives or
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CNRI not be used in advertising or publicity pertaining to
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distribution of the software without specific, written prior
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permission.
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1992-06-23 09:07:03 +00:00
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1996-10-25 14:44:06 +00:00
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While CWI is the initial source for this software, a modified version
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is made available by the Corporation for National Research Initiatives
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(CNRI) at the Internet address ftp://ftp.python.org.
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STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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PERFORMANCE OF THIS SOFTWARE.
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1992-06-23 09:07:03 +00:00
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******************************************************************/
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1996-06-12 04:22:53 +00:00
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/* select - Module containing unix select(2) call.
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1996-12-12 00:04:35 +00:00
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Under Unix, the file descriptors are small integers.
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Under Win32, select only exists for sockets, and sockets may
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have any value except INVALID_SOCKET.
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1996-06-12 04:22:53 +00:00
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*/
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1992-06-23 09:07:03 +00:00
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1996-12-12 00:04:35 +00:00
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#include "Python.h"
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1992-06-23 09:07:03 +00:00
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1996-12-05 23:43:35 +00:00
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif
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1996-12-09 18:47:43 +00:00
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#ifdef __sgi
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/* This is missing from unistd.h */
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extern void bzero();
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#endif
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1994-08-01 11:34:53 +00:00
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#include <sys/types.h>
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1996-06-12 04:22:53 +00:00
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1997-11-22 21:53:48 +00:00
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#if defined(PYOS_OS2)
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#include <sys/time.h>
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#include <utils.h>
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#endif
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1996-06-28 20:15:15 +00:00
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#ifdef MS_WINDOWS
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1996-06-12 04:22:53 +00:00
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#include <winsock.h>
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#else
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1994-08-01 11:34:53 +00:00
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#include "myselect.h" /* Also includes mytime.h */
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1996-06-12 04:22:53 +00:00
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#define SOCKET int
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#endif
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1992-06-23 09:07:03 +00:00
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1996-12-12 00:04:35 +00:00
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static PyObject *SelectError;
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1992-06-23 09:07:03 +00:00
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1996-12-12 22:16:21 +00:00
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/* list of Python objects and their file descriptor */
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typedef struct {
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PyObject *obj; /* owned reference */
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1996-06-12 04:22:53 +00:00
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SOCKET fd;
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1996-12-12 22:16:21 +00:00
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int sentinel; /* -1 == sentinel */
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1996-06-12 04:22:53 +00:00
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} pylist;
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1996-12-12 22:16:21 +00:00
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static void
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reap_obj(fd2obj)
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pylist fd2obj[FD_SETSIZE + 3];
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{
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int i;
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for (i = 0; i < FD_SETSIZE + 3 && fd2obj[i].sentinel >= 0; i++) {
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Py_XDECREF(fd2obj[i].obj);
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fd2obj[i].obj = NULL;
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}
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fd2obj[0].sentinel = -1;
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}
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1996-12-12 00:04:35 +00:00
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/* returns -1 and sets the Python exception if an error occurred, otherwise
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returns a number >= 0
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*/
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1996-06-12 04:22:53 +00:00
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static int
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1992-08-04 09:13:45 +00:00
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list2set(list, set, fd2obj)
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1996-12-12 00:04:35 +00:00
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PyObject *list;
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fd_set *set;
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pylist fd2obj[FD_SETSIZE + 3];
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1992-06-23 09:07:03 +00:00
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{
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1996-12-12 22:16:21 +00:00
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int i;
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int max = -1;
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int index = 0;
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int len = PyList_Size(list);
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PyObject* o = NULL;
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1995-03-29 16:47:45 +00:00
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1996-12-12 00:04:35 +00:00
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fd2obj[0].obj = (PyObject*)0; /* set list to zero size */
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FD_ZERO(set);
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1996-12-12 22:16:21 +00:00
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for (i = 0; i < len; i++) {
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PyObject *meth;
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SOCKET v;
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/* any intervening fileno() calls could decr this refcnt */
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1996-12-13 23:22:42 +00:00
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if (!(o = PyList_GetItem(list, i)))
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1996-12-16 18:15:34 +00:00
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return -1;
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1996-12-13 23:22:42 +00:00
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1996-12-12 22:16:21 +00:00
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Py_INCREF(o);
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1996-12-12 00:04:35 +00:00
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if (PyInt_Check(o)) {
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v = PyInt_AsLong(o);
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}
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else if ((meth = PyObject_GetAttrString(o, "fileno")) != NULL)
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{
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1996-12-12 22:16:21 +00:00
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PyObject *fno = PyEval_CallObject(meth, NULL);
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1996-12-12 00:04:35 +00:00
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Py_DECREF(meth);
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if (fno == NULL)
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1996-12-12 22:16:21 +00:00
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goto finally;
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1996-12-12 00:04:35 +00:00
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if (!PyInt_Check(fno)) {
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1996-12-12 22:16:21 +00:00
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PyErr_SetString(PyExc_TypeError,
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1996-12-12 00:04:35 +00:00
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"fileno method returned a non-integer");
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1996-12-12 22:16:21 +00:00
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Py_DECREF(fno);
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goto finally;
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1996-12-12 00:04:35 +00:00
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}
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v = PyInt_AsLong(fno);
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Py_DECREF(fno);
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}
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else {
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PyErr_SetString(PyExc_TypeError,
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1996-12-12 22:16:21 +00:00
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"argument must be an int, or have a fileno() method.");
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goto finally;
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1996-12-12 00:04:35 +00:00
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}
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1996-06-12 04:22:53 +00:00
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#ifdef _MSC_VER
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1996-12-12 22:16:21 +00:00
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max = 0; /* not used for Win32 */
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#else /* !_MSC_VER */
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1996-12-12 00:04:35 +00:00
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if (v < 0 || v >= FD_SETSIZE) {
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1996-12-12 22:16:21 +00:00
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PyErr_SetString(PyExc_ValueError,
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"filedescriptor out of range in select()");
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goto finally;
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1996-12-12 00:04:35 +00:00
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}
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if (v > max)
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max = v;
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1996-12-12 22:16:21 +00:00
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#endif /* _MSC_VER */
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1996-12-12 00:04:35 +00:00
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FD_SET(v, set);
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1996-12-12 22:16:21 +00:00
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1996-12-12 00:04:35 +00:00
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/* add object and its file descriptor to the list */
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if (index >= FD_SETSIZE) {
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1996-12-12 22:16:21 +00:00
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PyErr_SetString(PyExc_ValueError,
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"too many file descriptors in select()");
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goto finally;
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1996-12-12 00:04:35 +00:00
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}
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fd2obj[index].obj = o;
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fd2obj[index].fd = v;
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1996-12-12 22:16:21 +00:00
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fd2obj[index].sentinel = 0;
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fd2obj[++index].sentinel = -1;
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1996-06-12 04:22:53 +00:00
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}
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1996-12-12 00:04:35 +00:00
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return max+1;
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1996-12-12 22:16:21 +00:00
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finally:
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Py_XDECREF(o);
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return -1;
|
1992-06-23 09:07:03 +00:00
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}
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|
1996-12-12 00:04:35 +00:00
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/* returns NULL and sets the Python exception if an error occurred */
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static PyObject *
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1996-06-12 04:22:53 +00:00
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set2list(set, fd2obj)
|
1996-12-12 00:04:35 +00:00
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fd_set *set;
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pylist fd2obj[FD_SETSIZE + 3];
|
1992-06-23 09:07:03 +00:00
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{
|
1996-12-12 22:16:21 +00:00
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int i, j, count=0;
|
1996-12-12 00:04:35 +00:00
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PyObject *list, *o;
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SOCKET fd;
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|
|
1996-12-12 22:16:21 +00:00
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for (j = 0; fd2obj[j].sentinel >= 0; j++) {
|
1996-12-12 00:04:35 +00:00
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if (FD_ISSET(fd2obj[j].fd, set))
|
1996-12-12 22:16:21 +00:00
|
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count++;
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}
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list = PyList_New(count);
|
1996-12-12 00:04:35 +00:00
|
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|
if (!list)
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|
return NULL;
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|
1996-12-12 22:16:21 +00:00
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i = 0;
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for (j = 0; fd2obj[j].sentinel >= 0; j++) {
|
1996-12-12 00:04:35 +00:00
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fd = fd2obj[j].fd;
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if (FD_ISSET(fd, set)) {
|
1996-06-12 04:22:53 +00:00
|
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|
#ifndef _MSC_VER
|
1996-12-12 00:04:35 +00:00
|
|
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if (fd > FD_SETSIZE) {
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|
PyErr_SetString(PyExc_SystemError,
|
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|
|
"filedescriptor out of range returned in select()");
|
1996-12-12 22:16:21 +00:00
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goto finally;
|
1996-12-12 00:04:35 +00:00
|
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}
|
1996-06-12 04:22:53 +00:00
|
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#endif
|
1996-12-12 00:04:35 +00:00
|
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|
o = fd2obj[j].obj;
|
1996-12-12 22:16:21 +00:00
|
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|
fd2obj[j].obj = NULL;
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|
|
/* transfer ownership */
|
|
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|
if (PyList_SetItem(list, i, o) < 0)
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goto finally;
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i++;
|
1996-12-12 00:04:35 +00:00
|
|
|
}
|
|
|
|
}
|
|
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|
return list;
|
1996-12-12 22:16:21 +00:00
|
|
|
finally:
|
|
|
|
Py_DECREF(list);
|
|
|
|
return NULL;
|
1992-06-23 09:07:03 +00:00
|
|
|
}
|
1996-12-12 22:16:21 +00:00
|
|
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|
1992-06-23 09:07:03 +00:00
|
|
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|
1996-12-12 00:04:35 +00:00
|
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|
static PyObject *
|
1992-06-23 09:07:03 +00:00
|
|
|
select_select(self, args)
|
1996-12-12 00:04:35 +00:00
|
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|
PyObject *self;
|
|
|
|
PyObject *args;
|
1992-06-23 09:07:03 +00:00
|
|
|
{
|
1998-07-02 02:53:36 +00:00
|
|
|
#ifdef MS_WINDOWS
|
|
|
|
/* This would be an awful lot of stack space on Windows! */
|
|
|
|
pylist *rfd2obj, *wfd2obj, *efd2obj;
|
|
|
|
#else
|
1996-12-12 00:04:35 +00:00
|
|
|
pylist rfd2obj[FD_SETSIZE + 3];
|
|
|
|
pylist wfd2obj[FD_SETSIZE + 3];
|
|
|
|
pylist efd2obj[FD_SETSIZE + 3];
|
1998-07-02 02:53:36 +00:00
|
|
|
#endif
|
1996-12-12 00:04:35 +00:00
|
|
|
PyObject *ifdlist, *ofdlist, *efdlist;
|
1996-12-12 22:16:21 +00:00
|
|
|
PyObject *ret = NULL;
|
1996-12-12 00:04:35 +00:00
|
|
|
PyObject *tout = Py_None;
|
|
|
|
fd_set ifdset, ofdset, efdset;
|
|
|
|
double timeout;
|
|
|
|
struct timeval tv, *tvp;
|
|
|
|
int seconds;
|
|
|
|
int imax, omax, emax, max;
|
|
|
|
int n;
|
|
|
|
|
|
|
|
/* convert arguments */
|
|
|
|
if (!PyArg_ParseTuple(args, "OOO|O",
|
|
|
|
&ifdlist, &ofdlist, &efdlist, &tout))
|
|
|
|
return NULL;
|
|
|
|
|
|
|
|
if (tout == Py_None)
|
|
|
|
tvp = (struct timeval *)0;
|
1996-12-12 22:16:21 +00:00
|
|
|
else if (!PyArg_Parse(tout, "d", &timeout)) {
|
|
|
|
PyErr_SetString(PyExc_TypeError,
|
|
|
|
"timeout must be a float or None");
|
1996-12-12 00:04:35 +00:00
|
|
|
return NULL;
|
1996-12-12 22:16:21 +00:00
|
|
|
}
|
1993-11-01 16:27:16 +00:00
|
|
|
else {
|
1996-12-12 00:04:35 +00:00
|
|
|
seconds = (int)timeout;
|
|
|
|
timeout = timeout - (double)seconds;
|
|
|
|
tv.tv_sec = seconds;
|
|
|
|
tv.tv_usec = (int)(timeout*1000000.0);
|
|
|
|
tvp = &tv;
|
1993-11-01 16:27:16 +00:00
|
|
|
}
|
1996-12-12 00:04:35 +00:00
|
|
|
|
|
|
|
/* sanity check first three arguments */
|
|
|
|
if (!PyList_Check(ifdlist) ||
|
|
|
|
!PyList_Check(ofdlist) ||
|
|
|
|
!PyList_Check(efdlist))
|
|
|
|
{
|
|
|
|
PyErr_SetString(PyExc_TypeError,
|
|
|
|
"arguments 1-3 must be lists");
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
|
1998-07-02 02:53:36 +00:00
|
|
|
#ifdef MS_WINDOWS
|
|
|
|
/* Allocate memory for the lists */
|
|
|
|
rfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3);
|
|
|
|
wfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3);
|
|
|
|
efd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3);
|
|
|
|
if (rfd2obj == NULL || wfd2obj == NULL || efd2obj == NULL) {
|
|
|
|
PyMem_XDEL(rfd2obj);
|
|
|
|
PyMem_XDEL(wfd2obj);
|
|
|
|
PyMem_XDEL(efd2obj);
|
|
|
|
return NULL;
|
|
|
|
}
|
|
|
|
#endif
|
1996-12-12 00:04:35 +00:00
|
|
|
/* Convert lists to fd_sets, and get maximum fd number
|
|
|
|
* propagates the Python exception set in list2set()
|
|
|
|
*/
|
1996-12-12 22:16:21 +00:00
|
|
|
rfd2obj[0].sentinel = -1;
|
|
|
|
wfd2obj[0].sentinel = -1;
|
|
|
|
efd2obj[0].sentinel = -1;
|
1996-12-12 00:04:35 +00:00
|
|
|
if ((imax=list2set(ifdlist, &ifdset, rfd2obj)) < 0)
|
1996-12-12 22:16:21 +00:00
|
|
|
goto finally;
|
1996-12-12 00:04:35 +00:00
|
|
|
if ((omax=list2set(ofdlist, &ofdset, wfd2obj)) < 0)
|
1996-12-12 22:16:21 +00:00
|
|
|
goto finally;
|
1996-12-12 00:04:35 +00:00
|
|
|
if ((emax=list2set(efdlist, &efdset, efd2obj)) < 0)
|
1996-12-12 22:16:21 +00:00
|
|
|
goto finally;
|
1996-12-12 00:04:35 +00:00
|
|
|
max = imax;
|
|
|
|
if (omax > max) max = omax;
|
|
|
|
if (emax > max) max = emax;
|
|
|
|
|
|
|
|
Py_BEGIN_ALLOW_THREADS
|
|
|
|
n = select(max, &ifdset, &ofdset, &efdset, tvp);
|
|
|
|
Py_END_ALLOW_THREADS
|
|
|
|
|
|
|
|
if (n < 0) {
|
|
|
|
PyErr_SetFromErrno(SelectError);
|
|
|
|
}
|
1996-12-12 22:16:21 +00:00
|
|
|
else if (n == 0) {
|
|
|
|
/* optimization */
|
1996-12-12 00:04:35 +00:00
|
|
|
ifdlist = PyList_New(0);
|
1996-12-12 22:16:21 +00:00
|
|
|
if (ifdlist) {
|
|
|
|
ret = Py_BuildValue("OOO", ifdlist, ifdlist, ifdlist);
|
|
|
|
Py_DECREF(ifdlist);
|
|
|
|
}
|
1996-12-12 00:04:35 +00:00
|
|
|
}
|
1996-12-12 22:16:21 +00:00
|
|
|
else {
|
|
|
|
/* any of these three calls can raise an exception. it's more
|
|
|
|
convenient to test for this after all three calls... but
|
|
|
|
is that acceptable?
|
|
|
|
*/
|
|
|
|
ifdlist = set2list(&ifdset, rfd2obj);
|
|
|
|
ofdlist = set2list(&ofdset, wfd2obj);
|
|
|
|
efdlist = set2list(&efdset, efd2obj);
|
|
|
|
if (PyErr_Occurred())
|
|
|
|
ret = NULL;
|
|
|
|
else
|
|
|
|
ret = Py_BuildValue("OOO", ifdlist, ofdlist, efdlist);
|
|
|
|
|
|
|
|
Py_DECREF(ifdlist);
|
|
|
|
Py_DECREF(ofdlist);
|
|
|
|
Py_DECREF(efdlist);
|
|
|
|
}
|
|
|
|
|
|
|
|
finally:
|
|
|
|
reap_obj(rfd2obj);
|
|
|
|
reap_obj(wfd2obj);
|
|
|
|
reap_obj(efd2obj);
|
1998-07-02 02:53:36 +00:00
|
|
|
#ifdef MS_WINDOWS
|
|
|
|
PyMem_DEL(rfd2obj);
|
|
|
|
PyMem_DEL(wfd2obj);
|
|
|
|
PyMem_DEL(efd2obj);
|
|
|
|
#endif
|
1996-12-12 00:04:35 +00:00
|
|
|
return ret;
|
1992-06-23 09:07:03 +00:00
|
|
|
}
|
|
|
|
|
1998-06-28 16:54:49 +00:00
|
|
|
static char select_doc[] =
|
|
|
|
"select(rlist, wlist, xlist[, timeout]) -> (rlist, wlist, xlist)\n\
|
|
|
|
\n\
|
|
|
|
Wait until one or more file descriptors are ready for some kind of I/O.\n\
|
|
|
|
The first three arguments are lists of file descriptors to be waited for:\n\
|
|
|
|
rlist -- wait until ready for reading\n\
|
|
|
|
wlist -- wait until ready for writing\n\
|
|
|
|
xlist -- wait for an ``exceptional condition''\n\
|
|
|
|
If only one kind of condition is required, pass [] for the other lists.\n\
|
|
|
|
A file descriptor is either a socket or file object, or a small integer\n\
|
|
|
|
gotten from a fileno() method call on one of those.\n\
|
|
|
|
\n\
|
|
|
|
The optional 4th argument specifies a timeout in seconds; it may be\n\
|
|
|
|
a floating point number to specify fractions of seconds. If it is absent\n\
|
|
|
|
or None, the call will never time out.\n\
|
|
|
|
\n\
|
|
|
|
The return value is a tuple of three lists corresponding to the first three\n\
|
|
|
|
arguments; each contains the subset of the corresponding file descriptors\n\
|
|
|
|
that are ready.\n\
|
|
|
|
\n\
|
|
|
|
*** IMPORTANT NOTICE ***\n\
|
|
|
|
On Windows, only sockets are supported; on Unix, all file descriptors.";
|
|
|
|
|
1992-06-23 09:07:03 +00:00
|
|
|
|
1996-12-12 00:04:35 +00:00
|
|
|
static PyMethodDef select_methods[] = {
|
1998-06-28 16:54:49 +00:00
|
|
|
{"select", select_select, 1, select_doc},
|
1996-12-12 00:04:35 +00:00
|
|
|
{0, 0}, /* sentinel */
|
1992-06-23 09:07:03 +00:00
|
|
|
};
|
|
|
|
|
1998-06-28 16:54:49 +00:00
|
|
|
static char module_doc[] =
|
|
|
|
"This module supports asynchronous I/O on multiple file descriptors.\n\
|
|
|
|
\n\
|
|
|
|
*** IMPORTANT NOTICE ***\n\
|
|
|
|
On Windows, only sockets are supported; on Unix, all file descriptors.";
|
1992-06-23 09:07:03 +00:00
|
|
|
|
|
|
|
void
|
|
|
|
initselect()
|
|
|
|
{
|
1996-12-12 00:04:35 +00:00
|
|
|
PyObject *m, *d;
|
1998-06-28 16:54:49 +00:00
|
|
|
m = Py_InitModule3("select", select_methods, module_doc);
|
1996-12-12 00:04:35 +00:00
|
|
|
d = PyModule_GetDict(m);
|
1997-10-01 04:29:29 +00:00
|
|
|
SelectError = PyErr_NewException("select.error", NULL, NULL);
|
1996-12-12 00:04:35 +00:00
|
|
|
PyDict_SetItemString(d, "error", SelectError);
|
1992-06-23 09:07:03 +00:00
|
|
|
}
|