Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | 524b588 | 1995-01-04 19:10:35 +0000 | [diff] [blame] | 2 | Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam, |
| 3 | The Netherlands. |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 4 | |
| 5 | All Rights Reserved |
| 6 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 7 | Permission to use, copy, modify, and distribute this software and its |
| 8 | documentation for any purpose and without fee is hereby granted, |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 9 | provided that the above copyright notice appear in all copies and that |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 10 | both that copyright notice and this permission notice appear in |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 11 | supporting documentation, and that the names of Stichting Mathematisch |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 12 | Centrum or CWI or Corporation for National Research Initiatives or |
| 13 | CNRI not be used in advertising or publicity pertaining to |
| 14 | distribution of the software without specific, written prior |
| 15 | permission. |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 16 | |
Guido van Rossum | d266eb4 | 1996-10-25 14:44:06 +0000 | [diff] [blame] | 17 | While CWI is the initial source for this software, a modified version |
| 18 | is made available by the Corporation for National Research Initiatives |
| 19 | (CNRI) at the Internet address ftp://ftp.python.org. |
| 20 | |
| 21 | STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH |
| 22 | REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF |
| 23 | MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH |
| 24 | CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL |
| 25 | DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR |
| 26 | PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| 27 | TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR |
| 28 | PERFORMANCE OF THIS SOFTWARE. |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 29 | |
| 30 | ******************************************************************/ |
| 31 | |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 32 | /* select - Module containing unix select(2) call. |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 33 | Under Unix, the file descriptors are small integers. |
| 34 | Under Win32, select only exists for sockets, and sockets may |
| 35 | have any value except INVALID_SOCKET. |
Guido van Rossum | bcc2074 | 1998-08-04 22:53:56 +0000 | [diff] [blame] | 36 | Under BeOS, we suffer the same dichotomy as Win32; sockets can be anything |
| 37 | >= 0. |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 38 | */ |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 39 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 40 | #include "Python.h" |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 41 | |
Guido van Rossum | a376cc5 | 1996-12-05 23:43:35 +0000 | [diff] [blame] | 42 | #ifdef HAVE_UNISTD_H |
| 43 | #include <unistd.h> |
| 44 | #endif |
| 45 | |
Guido van Rossum | 3727317 | 1996-12-09 18:47:43 +0000 | [diff] [blame] | 46 | #ifdef __sgi |
| 47 | /* This is missing from unistd.h */ |
| 48 | extern void bzero(); |
| 49 | #endif |
| 50 | |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 51 | #include <sys/types.h> |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 52 | |
Guido van Rossum | 8e9ebfd | 1997-11-22 21:53:48 +0000 | [diff] [blame] | 53 | #if defined(PYOS_OS2) |
| 54 | #include <sys/time.h> |
| 55 | #include <utils.h> |
| 56 | #endif |
| 57 | |
Guido van Rossum | 6f489d9 | 1996-06-28 20:15:15 +0000 | [diff] [blame] | 58 | #ifdef MS_WINDOWS |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 59 | #include <winsock.h> |
| 60 | #else |
Guido van Rossum | bcc2074 | 1998-08-04 22:53:56 +0000 | [diff] [blame] | 61 | #ifdef __BEOS__ |
| 62 | #include <net/socket.h> |
| 63 | #define SOCKET int |
| 64 | #else |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 65 | #include "myselect.h" /* Also includes mytime.h */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 66 | #define SOCKET int |
| 67 | #endif |
Guido van Rossum | bcc2074 | 1998-08-04 22:53:56 +0000 | [diff] [blame] | 68 | #endif |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 69 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 70 | static PyObject *SelectError; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 71 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 72 | /* list of Python objects and their file descriptor */ |
| 73 | typedef struct { |
| 74 | PyObject *obj; /* owned reference */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 75 | SOCKET fd; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 76 | int sentinel; /* -1 == sentinel */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 77 | } pylist; |
| 78 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 79 | static void |
| 80 | reap_obj(fd2obj) |
| 81 | pylist fd2obj[FD_SETSIZE + 3]; |
| 82 | { |
| 83 | int i; |
| 84 | for (i = 0; i < FD_SETSIZE + 3 && fd2obj[i].sentinel >= 0; i++) { |
| 85 | Py_XDECREF(fd2obj[i].obj); |
| 86 | fd2obj[i].obj = NULL; |
| 87 | } |
| 88 | fd2obj[0].sentinel = -1; |
| 89 | } |
| 90 | |
| 91 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 92 | /* returns -1 and sets the Python exception if an error occurred, otherwise |
| 93 | returns a number >= 0 |
| 94 | */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 95 | static int |
Guido van Rossum | 4fbf798 | 1992-08-04 09:13:45 +0000 | [diff] [blame] | 96 | list2set(list, set, fd2obj) |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 97 | PyObject *list; |
| 98 | fd_set *set; |
| 99 | pylist fd2obj[FD_SETSIZE + 3]; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 100 | { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 101 | int i; |
| 102 | int max = -1; |
| 103 | int index = 0; |
| 104 | int len = PyList_Size(list); |
| 105 | PyObject* o = NULL; |
Guido van Rossum | 07432c0 | 1995-03-29 16:47:45 +0000 | [diff] [blame] | 106 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 107 | fd2obj[0].obj = (PyObject*)0; /* set list to zero size */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 108 | FD_ZERO(set); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 109 | |
| 110 | for (i = 0; i < len; i++) { |
| 111 | PyObject *meth; |
| 112 | SOCKET v; |
| 113 | |
| 114 | /* any intervening fileno() calls could decr this refcnt */ |
Barry Warsaw | 24c4b3d | 1996-12-13 23:22:42 +0000 | [diff] [blame] | 115 | if (!(o = PyList_GetItem(list, i))) |
Barry Warsaw | 529fcfe | 1996-12-16 18:15:34 +0000 | [diff] [blame] | 116 | return -1; |
Barry Warsaw | 24c4b3d | 1996-12-13 23:22:42 +0000 | [diff] [blame] | 117 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 118 | Py_INCREF(o); |
| 119 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 120 | if (PyInt_Check(o)) { |
| 121 | v = PyInt_AsLong(o); |
| 122 | } |
| 123 | else if ((meth = PyObject_GetAttrString(o, "fileno")) != NULL) |
| 124 | { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 125 | PyObject *fno = PyEval_CallObject(meth, NULL); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 126 | Py_DECREF(meth); |
| 127 | if (fno == NULL) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 128 | goto finally; |
| 129 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 130 | if (!PyInt_Check(fno)) { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 131 | PyErr_SetString(PyExc_TypeError, |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 132 | "fileno method returned a non-integer"); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 133 | Py_DECREF(fno); |
| 134 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 135 | } |
| 136 | v = PyInt_AsLong(fno); |
| 137 | Py_DECREF(fno); |
| 138 | } |
| 139 | else { |
| 140 | PyErr_SetString(PyExc_TypeError, |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 141 | "argument must be an int, or have a fileno() method."); |
| 142 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 143 | } |
Guido van Rossum | bcc2074 | 1998-08-04 22:53:56 +0000 | [diff] [blame] | 144 | #if defined(_MSC_VER) || defined(__BEOS__) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 145 | max = 0; /* not used for Win32 */ |
| 146 | #else /* !_MSC_VER */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 147 | if (v < 0 || v >= FD_SETSIZE) { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 148 | PyErr_SetString(PyExc_ValueError, |
| 149 | "filedescriptor out of range in select()"); |
| 150 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 151 | } |
| 152 | if (v > max) |
| 153 | max = v; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 154 | #endif /* _MSC_VER */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 155 | FD_SET(v, set); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 156 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 157 | /* add object and its file descriptor to the list */ |
| 158 | if (index >= FD_SETSIZE) { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 159 | PyErr_SetString(PyExc_ValueError, |
| 160 | "too many file descriptors in select()"); |
| 161 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 162 | } |
| 163 | fd2obj[index].obj = o; |
| 164 | fd2obj[index].fd = v; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 165 | fd2obj[index].sentinel = 0; |
| 166 | fd2obj[++index].sentinel = -1; |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 167 | } |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 168 | return max+1; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 169 | |
| 170 | finally: |
| 171 | Py_XDECREF(o); |
| 172 | return -1; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 173 | } |
| 174 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 175 | /* returns NULL and sets the Python exception if an error occurred */ |
| 176 | static PyObject * |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 177 | set2list(set, fd2obj) |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 178 | fd_set *set; |
| 179 | pylist fd2obj[FD_SETSIZE + 3]; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 180 | { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 181 | int i, j, count=0; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 182 | PyObject *list, *o; |
| 183 | SOCKET fd; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 184 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 185 | for (j = 0; fd2obj[j].sentinel >= 0; j++) { |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 186 | if (FD_ISSET(fd2obj[j].fd, set)) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 187 | count++; |
| 188 | } |
| 189 | list = PyList_New(count); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 190 | if (!list) |
| 191 | return NULL; |
| 192 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 193 | i = 0; |
| 194 | for (j = 0; fd2obj[j].sentinel >= 0; j++) { |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 195 | fd = fd2obj[j].fd; |
| 196 | if (FD_ISSET(fd, set)) { |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 197 | #ifndef _MSC_VER |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 198 | if (fd > FD_SETSIZE) { |
| 199 | PyErr_SetString(PyExc_SystemError, |
| 200 | "filedescriptor out of range returned in select()"); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 201 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 202 | } |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 203 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 204 | o = fd2obj[j].obj; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 205 | fd2obj[j].obj = NULL; |
| 206 | /* transfer ownership */ |
| 207 | if (PyList_SetItem(list, i, o) < 0) |
| 208 | goto finally; |
| 209 | |
| 210 | i++; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 211 | } |
| 212 | } |
| 213 | return list; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 214 | finally: |
| 215 | Py_DECREF(list); |
| 216 | return NULL; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 217 | } |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 218 | |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 219 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 220 | static PyObject * |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 221 | select_select(self, args) |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 222 | PyObject *self; |
| 223 | PyObject *args; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 224 | { |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 225 | #ifdef MS_WINDOWS |
| 226 | /* This would be an awful lot of stack space on Windows! */ |
| 227 | pylist *rfd2obj, *wfd2obj, *efd2obj; |
| 228 | #else |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 229 | pylist rfd2obj[FD_SETSIZE + 3]; |
| 230 | pylist wfd2obj[FD_SETSIZE + 3]; |
| 231 | pylist efd2obj[FD_SETSIZE + 3]; |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 232 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 233 | PyObject *ifdlist, *ofdlist, *efdlist; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 234 | PyObject *ret = NULL; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 235 | PyObject *tout = Py_None; |
| 236 | fd_set ifdset, ofdset, efdset; |
| 237 | double timeout; |
| 238 | struct timeval tv, *tvp; |
| 239 | int seconds; |
| 240 | int imax, omax, emax, max; |
| 241 | int n; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 242 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 243 | /* convert arguments */ |
| 244 | if (!PyArg_ParseTuple(args, "OOO|O", |
| 245 | &ifdlist, &ofdlist, &efdlist, &tout)) |
| 246 | return NULL; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 247 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 248 | if (tout == Py_None) |
| 249 | tvp = (struct timeval *)0; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 250 | else if (!PyArg_Parse(tout, "d", &timeout)) { |
| 251 | PyErr_SetString(PyExc_TypeError, |
| 252 | "timeout must be a float or None"); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 253 | return NULL; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 254 | } |
Guido van Rossum | c7a2270 | 1993-11-01 16:27:16 +0000 | [diff] [blame] | 255 | else { |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 256 | seconds = (int)timeout; |
| 257 | timeout = timeout - (double)seconds; |
| 258 | tv.tv_sec = seconds; |
| 259 | tv.tv_usec = (int)(timeout*1000000.0); |
| 260 | tvp = &tv; |
Guido van Rossum | c7a2270 | 1993-11-01 16:27:16 +0000 | [diff] [blame] | 261 | } |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 262 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 263 | /* sanity check first three arguments */ |
| 264 | if (!PyList_Check(ifdlist) || |
| 265 | !PyList_Check(ofdlist) || |
| 266 | !PyList_Check(efdlist)) |
| 267 | { |
| 268 | PyErr_SetString(PyExc_TypeError, |
| 269 | "arguments 1-3 must be lists"); |
| 270 | return NULL; |
| 271 | } |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 272 | |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 273 | #ifdef MS_WINDOWS |
| 274 | /* Allocate memory for the lists */ |
| 275 | rfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3); |
| 276 | wfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3); |
| 277 | efd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3); |
| 278 | if (rfd2obj == NULL || wfd2obj == NULL || efd2obj == NULL) { |
| 279 | PyMem_XDEL(rfd2obj); |
| 280 | PyMem_XDEL(wfd2obj); |
| 281 | PyMem_XDEL(efd2obj); |
| 282 | return NULL; |
| 283 | } |
| 284 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 285 | /* Convert lists to fd_sets, and get maximum fd number |
| 286 | * propagates the Python exception set in list2set() |
| 287 | */ |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 288 | rfd2obj[0].sentinel = -1; |
| 289 | wfd2obj[0].sentinel = -1; |
| 290 | efd2obj[0].sentinel = -1; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 291 | if ((imax=list2set(ifdlist, &ifdset, rfd2obj)) < 0) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 292 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 293 | if ((omax=list2set(ofdlist, &ofdset, wfd2obj)) < 0) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 294 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 295 | if ((emax=list2set(efdlist, &efdset, efd2obj)) < 0) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 296 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 297 | max = imax; |
| 298 | if (omax > max) max = omax; |
| 299 | if (emax > max) max = emax; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 300 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 301 | Py_BEGIN_ALLOW_THREADS |
| 302 | n = select(max, &ifdset, &ofdset, &efdset, tvp); |
| 303 | Py_END_ALLOW_THREADS |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 304 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 305 | if (n < 0) { |
| 306 | PyErr_SetFromErrno(SelectError); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 307 | } |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 308 | else if (n == 0) { |
| 309 | /* optimization */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 310 | ifdlist = PyList_New(0); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 311 | if (ifdlist) { |
| 312 | ret = Py_BuildValue("OOO", ifdlist, ifdlist, ifdlist); |
| 313 | Py_DECREF(ifdlist); |
| 314 | } |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 315 | } |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 316 | else { |
| 317 | /* any of these three calls can raise an exception. it's more |
| 318 | convenient to test for this after all three calls... but |
| 319 | is that acceptable? |
| 320 | */ |
| 321 | ifdlist = set2list(&ifdset, rfd2obj); |
| 322 | ofdlist = set2list(&ofdset, wfd2obj); |
| 323 | efdlist = set2list(&efdset, efd2obj); |
| 324 | if (PyErr_Occurred()) |
| 325 | ret = NULL; |
| 326 | else |
| 327 | ret = Py_BuildValue("OOO", ifdlist, ofdlist, efdlist); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 328 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 329 | Py_DECREF(ifdlist); |
| 330 | Py_DECREF(ofdlist); |
| 331 | Py_DECREF(efdlist); |
| 332 | } |
| 333 | |
| 334 | finally: |
| 335 | reap_obj(rfd2obj); |
| 336 | reap_obj(wfd2obj); |
| 337 | reap_obj(efd2obj); |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 338 | #ifdef MS_WINDOWS |
| 339 | PyMem_DEL(rfd2obj); |
| 340 | PyMem_DEL(wfd2obj); |
| 341 | PyMem_DEL(efd2obj); |
| 342 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 343 | return ret; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 344 | } |
| 345 | |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 346 | static char select_doc[] = |
| 347 | "select(rlist, wlist, xlist[, timeout]) -> (rlist, wlist, xlist)\n\ |
| 348 | \n\ |
| 349 | Wait until one or more file descriptors are ready for some kind of I/O.\n\ |
| 350 | The first three arguments are lists of file descriptors to be waited for:\n\ |
| 351 | rlist -- wait until ready for reading\n\ |
| 352 | wlist -- wait until ready for writing\n\ |
| 353 | xlist -- wait for an ``exceptional condition''\n\ |
| 354 | If only one kind of condition is required, pass [] for the other lists.\n\ |
| 355 | A file descriptor is either a socket or file object, or a small integer\n\ |
| 356 | gotten from a fileno() method call on one of those.\n\ |
| 357 | \n\ |
| 358 | The optional 4th argument specifies a timeout in seconds; it may be\n\ |
| 359 | a floating point number to specify fractions of seconds. If it is absent\n\ |
| 360 | or None, the call will never time out.\n\ |
| 361 | \n\ |
| 362 | The return value is a tuple of three lists corresponding to the first three\n\ |
| 363 | arguments; each contains the subset of the corresponding file descriptors\n\ |
| 364 | that are ready.\n\ |
| 365 | \n\ |
| 366 | *** IMPORTANT NOTICE ***\n\ |
| 367 | On Windows, only sockets are supported; on Unix, all file descriptors."; |
| 368 | |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 369 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 370 | static PyMethodDef select_methods[] = { |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 371 | {"select", select_select, 1, select_doc}, |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 372 | {0, 0}, /* sentinel */ |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 373 | }; |
| 374 | |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 375 | static char module_doc[] = |
| 376 | "This module supports asynchronous I/O on multiple file descriptors.\n\ |
| 377 | \n\ |
| 378 | *** IMPORTANT NOTICE ***\n\ |
| 379 | On Windows, only sockets are supported; on Unix, all file descriptors."; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 380 | |
| 381 | void |
| 382 | initselect() |
| 383 | { |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 384 | PyObject *m, *d; |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 385 | m = Py_InitModule3("select", select_methods, module_doc); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 386 | d = PyModule_GetDict(m); |
Guido van Rossum | 0cb96de | 1997-10-01 04:29:29 +0000 | [diff] [blame] | 387 | SelectError = PyErr_NewException("select.error", NULL, NULL); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 388 | PyDict_SetItemString(d, "error", SelectError); |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 389 | } |