Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 1 | /*********************************************************** |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 2 | Copyright (c) 2000, BeOpen.com. |
| 3 | Copyright (c) 1995-2000, Corporation for National Research Initiatives. |
| 4 | Copyright (c) 1990-1995, Stichting Mathematisch Centrum. |
| 5 | All rights reserved. |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 6 | |
Guido van Rossum | fd71b9e | 2000-06-30 23:50:40 +0000 | [diff] [blame] | 7 | See the file "Misc/COPYRIGHT" for information on usage and |
| 8 | redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES. |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 9 | ******************************************************************/ |
| 10 | |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 11 | /* select - Module containing unix select(2) call. |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 12 | Under Unix, the file descriptors are small integers. |
| 13 | Under Win32, select only exists for sockets, and sockets may |
| 14 | have any value except INVALID_SOCKET. |
Guido van Rossum | bcc2074 | 1998-08-04 22:53:56 +0000 | [diff] [blame] | 15 | Under BeOS, we suffer the same dichotomy as Win32; sockets can be anything |
| 16 | >= 0. |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 17 | */ |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 18 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 19 | #include "Python.h" |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 20 | |
Guido van Rossum | a376cc5 | 1996-12-05 23:43:35 +0000 | [diff] [blame] | 21 | #ifdef HAVE_UNISTD_H |
| 22 | #include <unistd.h> |
| 23 | #endif |
| 24 | |
Guido van Rossum | 3727317 | 1996-12-09 18:47:43 +0000 | [diff] [blame] | 25 | #ifdef __sgi |
| 26 | /* This is missing from unistd.h */ |
| 27 | extern void bzero(); |
| 28 | #endif |
| 29 | |
Guido van Rossum | ff7e83d | 1999-08-27 20:39:37 +0000 | [diff] [blame] | 30 | #ifndef DONT_HAVE_SYS_TYPES_H |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 31 | #include <sys/types.h> |
Guido van Rossum | ff7e83d | 1999-08-27 20:39:37 +0000 | [diff] [blame] | 32 | #endif |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 33 | |
Guido van Rossum | 8e9ebfd | 1997-11-22 21:53:48 +0000 | [diff] [blame] | 34 | #if defined(PYOS_OS2) |
| 35 | #include <sys/time.h> |
| 36 | #include <utils.h> |
| 37 | #endif |
| 38 | |
Guido van Rossum | 6f489d9 | 1996-06-28 20:15:15 +0000 | [diff] [blame] | 39 | #ifdef MS_WINDOWS |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 40 | #include <winsock.h> |
| 41 | #else |
Guido van Rossum | bcc2074 | 1998-08-04 22:53:56 +0000 | [diff] [blame] | 42 | #ifdef __BEOS__ |
| 43 | #include <net/socket.h> |
| 44 | #define SOCKET int |
| 45 | #else |
Guido van Rossum | b6775db | 1994-08-01 11:34:53 +0000 | [diff] [blame] | 46 | #include "myselect.h" /* Also includes mytime.h */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 47 | #define SOCKET int |
| 48 | #endif |
Guido van Rossum | bcc2074 | 1998-08-04 22:53:56 +0000 | [diff] [blame] | 49 | #endif |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 50 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 51 | static PyObject *SelectError; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 52 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 53 | /* list of Python objects and their file descriptor */ |
| 54 | typedef struct { |
| 55 | PyObject *obj; /* owned reference */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 56 | SOCKET fd; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 57 | int sentinel; /* -1 == sentinel */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 58 | } pylist; |
| 59 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 60 | static void |
Peter Schneider-Kamp | 41c36ff | 2000-07-10 12:29:26 +0000 | [diff] [blame^] | 61 | reap_obj(pylist fd2obj[FD_SETSIZE + 3]) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 62 | { |
| 63 | int i; |
| 64 | for (i = 0; i < FD_SETSIZE + 3 && fd2obj[i].sentinel >= 0; i++) { |
| 65 | Py_XDECREF(fd2obj[i].obj); |
| 66 | fd2obj[i].obj = NULL; |
| 67 | } |
| 68 | fd2obj[0].sentinel = -1; |
| 69 | } |
| 70 | |
| 71 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 72 | /* returns -1 and sets the Python exception if an error occurred, otherwise |
| 73 | returns a number >= 0 |
| 74 | */ |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 75 | static int |
Peter Schneider-Kamp | 41c36ff | 2000-07-10 12:29:26 +0000 | [diff] [blame^] | 76 | list2set(PyObject *list, fd_set *set, pylist fd2obj[FD_SETSIZE + 3]) |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 77 | { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 78 | int i; |
| 79 | int max = -1; |
| 80 | int index = 0; |
| 81 | int len = PyList_Size(list); |
| 82 | PyObject* o = NULL; |
Guido van Rossum | 07432c0 | 1995-03-29 16:47:45 +0000 | [diff] [blame] | 83 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 84 | fd2obj[0].obj = (PyObject*)0; /* set list to zero size */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 85 | FD_ZERO(set); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 86 | |
| 87 | for (i = 0; i < len; i++) { |
| 88 | PyObject *meth; |
| 89 | SOCKET v; |
| 90 | |
| 91 | /* any intervening fileno() calls could decr this refcnt */ |
Barry Warsaw | 24c4b3d | 1996-12-13 23:22:42 +0000 | [diff] [blame] | 92 | if (!(o = PyList_GetItem(list, i))) |
Barry Warsaw | 529fcfe | 1996-12-16 18:15:34 +0000 | [diff] [blame] | 93 | return -1; |
Barry Warsaw | 24c4b3d | 1996-12-13 23:22:42 +0000 | [diff] [blame] | 94 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 95 | Py_INCREF(o); |
| 96 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 97 | if (PyInt_Check(o)) { |
| 98 | v = PyInt_AsLong(o); |
| 99 | } |
| 100 | else if ((meth = PyObject_GetAttrString(o, "fileno")) != NULL) |
| 101 | { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 102 | PyObject *fno = PyEval_CallObject(meth, NULL); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 103 | Py_DECREF(meth); |
| 104 | if (fno == NULL) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 105 | goto finally; |
| 106 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 107 | if (!PyInt_Check(fno)) { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 108 | PyErr_SetString(PyExc_TypeError, |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 109 | "fileno method returned a non-integer"); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 110 | Py_DECREF(fno); |
| 111 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 112 | } |
| 113 | v = PyInt_AsLong(fno); |
| 114 | Py_DECREF(fno); |
| 115 | } |
| 116 | else { |
| 117 | PyErr_SetString(PyExc_TypeError, |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 118 | "argument must be an int, or have a fileno() method."); |
| 119 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 120 | } |
Guido van Rossum | 947a0fa | 2000-01-14 16:33:09 +0000 | [diff] [blame] | 121 | #if defined(_MSC_VER) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 122 | max = 0; /* not used for Win32 */ |
| 123 | #else /* !_MSC_VER */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 124 | if (v < 0 || v >= FD_SETSIZE) { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 125 | PyErr_SetString(PyExc_ValueError, |
| 126 | "filedescriptor out of range in select()"); |
| 127 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 128 | } |
| 129 | if (v > max) |
| 130 | max = v; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 131 | #endif /* _MSC_VER */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 132 | FD_SET(v, set); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 133 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 134 | /* add object and its file descriptor to the list */ |
| 135 | if (index >= FD_SETSIZE) { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 136 | PyErr_SetString(PyExc_ValueError, |
| 137 | "too many file descriptors in select()"); |
| 138 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 139 | } |
| 140 | fd2obj[index].obj = o; |
| 141 | fd2obj[index].fd = v; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 142 | fd2obj[index].sentinel = 0; |
| 143 | fd2obj[++index].sentinel = -1; |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 144 | } |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 145 | return max+1; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 146 | |
| 147 | finally: |
| 148 | Py_XDECREF(o); |
| 149 | return -1; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 150 | } |
| 151 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 152 | /* returns NULL and sets the Python exception if an error occurred */ |
| 153 | static PyObject * |
Peter Schneider-Kamp | 41c36ff | 2000-07-10 12:29:26 +0000 | [diff] [blame^] | 154 | set2list(fd_set *set, pylist fd2obj[FD_SETSIZE + 3]) |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 155 | { |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 156 | int i, j, count=0; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 157 | PyObject *list, *o; |
| 158 | SOCKET fd; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 159 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 160 | for (j = 0; fd2obj[j].sentinel >= 0; j++) { |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 161 | if (FD_ISSET(fd2obj[j].fd, set)) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 162 | count++; |
| 163 | } |
| 164 | list = PyList_New(count); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 165 | if (!list) |
| 166 | return NULL; |
| 167 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 168 | i = 0; |
| 169 | for (j = 0; fd2obj[j].sentinel >= 0; j++) { |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 170 | fd = fd2obj[j].fd; |
| 171 | if (FD_ISSET(fd, set)) { |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 172 | #ifndef _MSC_VER |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 173 | if (fd > FD_SETSIZE) { |
| 174 | PyErr_SetString(PyExc_SystemError, |
| 175 | "filedescriptor out of range returned in select()"); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 176 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 177 | } |
Guido van Rossum | 4f0fbf8 | 1996-06-12 04:22:53 +0000 | [diff] [blame] | 178 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 179 | o = fd2obj[j].obj; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 180 | fd2obj[j].obj = NULL; |
| 181 | /* transfer ownership */ |
| 182 | if (PyList_SetItem(list, i, o) < 0) |
| 183 | goto finally; |
| 184 | |
| 185 | i++; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 186 | } |
| 187 | } |
| 188 | return list; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 189 | finally: |
| 190 | Py_DECREF(list); |
| 191 | return NULL; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 192 | } |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 193 | |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 194 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 195 | static PyObject * |
Peter Schneider-Kamp | 41c36ff | 2000-07-10 12:29:26 +0000 | [diff] [blame^] | 196 | select_select(PyObject *self, PyObject *args) |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 197 | { |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 198 | #ifdef MS_WINDOWS |
| 199 | /* This would be an awful lot of stack space on Windows! */ |
| 200 | pylist *rfd2obj, *wfd2obj, *efd2obj; |
| 201 | #else |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 202 | pylist rfd2obj[FD_SETSIZE + 3]; |
| 203 | pylist wfd2obj[FD_SETSIZE + 3]; |
| 204 | pylist efd2obj[FD_SETSIZE + 3]; |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 205 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 206 | PyObject *ifdlist, *ofdlist, *efdlist; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 207 | PyObject *ret = NULL; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 208 | PyObject *tout = Py_None; |
| 209 | fd_set ifdset, ofdset, efdset; |
| 210 | double timeout; |
| 211 | struct timeval tv, *tvp; |
Guido van Rossum | 3262e16 | 2000-06-28 21:18:13 +0000 | [diff] [blame] | 212 | long seconds; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 213 | int imax, omax, emax, max; |
| 214 | int n; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 215 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 216 | /* convert arguments */ |
Guido van Rossum | 43713e5 | 2000-02-29 13:59:29 +0000 | [diff] [blame] | 217 | if (!PyArg_ParseTuple(args, "OOO|O:select", |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 218 | &ifdlist, &ofdlist, &efdlist, &tout)) |
| 219 | return NULL; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 220 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 221 | if (tout == Py_None) |
| 222 | tvp = (struct timeval *)0; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 223 | else if (!PyArg_Parse(tout, "d", &timeout)) { |
| 224 | PyErr_SetString(PyExc_TypeError, |
| 225 | "timeout must be a float or None"); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 226 | return NULL; |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 227 | } |
Guido van Rossum | c7a2270 | 1993-11-01 16:27:16 +0000 | [diff] [blame] | 228 | else { |
Guido van Rossum | 3262e16 | 2000-06-28 21:18:13 +0000 | [diff] [blame] | 229 | if (timeout > (double)LONG_MAX) { |
| 230 | PyErr_SetString(PyExc_OverflowError, "timeout period too long"); |
| 231 | return NULL; |
| 232 | } |
| 233 | seconds = (long)timeout; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 234 | timeout = timeout - (double)seconds; |
| 235 | tv.tv_sec = seconds; |
Guido van Rossum | 3262e16 | 2000-06-28 21:18:13 +0000 | [diff] [blame] | 236 | tv.tv_usec = (long)(timeout*1000000.0); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 237 | tvp = &tv; |
Guido van Rossum | c7a2270 | 1993-11-01 16:27:16 +0000 | [diff] [blame] | 238 | } |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 239 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 240 | /* sanity check first three arguments */ |
| 241 | if (!PyList_Check(ifdlist) || |
| 242 | !PyList_Check(ofdlist) || |
| 243 | !PyList_Check(efdlist)) |
| 244 | { |
| 245 | PyErr_SetString(PyExc_TypeError, |
| 246 | "arguments 1-3 must be lists"); |
| 247 | return NULL; |
| 248 | } |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 249 | |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 250 | #ifdef MS_WINDOWS |
| 251 | /* Allocate memory for the lists */ |
| 252 | rfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3); |
| 253 | wfd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3); |
| 254 | efd2obj = PyMem_NEW(pylist, FD_SETSIZE + 3); |
| 255 | if (rfd2obj == NULL || wfd2obj == NULL || efd2obj == NULL) { |
Guido van Rossum | b18618d | 2000-05-03 23:44:39 +0000 | [diff] [blame] | 256 | if (rfd2obj) PyMem_DEL(rfd2obj); |
| 257 | if (wfd2obj) PyMem_DEL(wfd2obj); |
| 258 | if (efd2obj) PyMem_DEL(efd2obj); |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 259 | return NULL; |
| 260 | } |
| 261 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 262 | /* Convert lists to fd_sets, and get maximum fd number |
| 263 | * propagates the Python exception set in list2set() |
| 264 | */ |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 265 | rfd2obj[0].sentinel = -1; |
| 266 | wfd2obj[0].sentinel = -1; |
| 267 | efd2obj[0].sentinel = -1; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 268 | if ((imax=list2set(ifdlist, &ifdset, rfd2obj)) < 0) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 269 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 270 | if ((omax=list2set(ofdlist, &ofdset, wfd2obj)) < 0) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 271 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 272 | if ((emax=list2set(efdlist, &efdset, efd2obj)) < 0) |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 273 | goto finally; |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 274 | max = imax; |
| 275 | if (omax > max) max = omax; |
| 276 | if (emax > max) max = emax; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 277 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 278 | Py_BEGIN_ALLOW_THREADS |
| 279 | n = select(max, &ifdset, &ofdset, &efdset, tvp); |
| 280 | Py_END_ALLOW_THREADS |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 281 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 282 | if (n < 0) { |
| 283 | PyErr_SetFromErrno(SelectError); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 284 | } |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 285 | else if (n == 0) { |
| 286 | /* optimization */ |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 287 | ifdlist = PyList_New(0); |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 288 | if (ifdlist) { |
| 289 | ret = Py_BuildValue("OOO", ifdlist, ifdlist, ifdlist); |
| 290 | Py_DECREF(ifdlist); |
| 291 | } |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 292 | } |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 293 | else { |
| 294 | /* any of these three calls can raise an exception. it's more |
| 295 | convenient to test for this after all three calls... but |
| 296 | is that acceptable? |
| 297 | */ |
| 298 | ifdlist = set2list(&ifdset, rfd2obj); |
| 299 | ofdlist = set2list(&ofdset, wfd2obj); |
| 300 | efdlist = set2list(&efdset, efd2obj); |
| 301 | if (PyErr_Occurred()) |
| 302 | ret = NULL; |
| 303 | else |
| 304 | ret = Py_BuildValue("OOO", ifdlist, ofdlist, efdlist); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 305 | |
Barry Warsaw | c1cb360 | 1996-12-12 22:16:21 +0000 | [diff] [blame] | 306 | Py_DECREF(ifdlist); |
| 307 | Py_DECREF(ofdlist); |
| 308 | Py_DECREF(efdlist); |
| 309 | } |
| 310 | |
| 311 | finally: |
| 312 | reap_obj(rfd2obj); |
| 313 | reap_obj(wfd2obj); |
| 314 | reap_obj(efd2obj); |
Guido van Rossum | d20781b | 1998-07-02 02:53:36 +0000 | [diff] [blame] | 315 | #ifdef MS_WINDOWS |
| 316 | PyMem_DEL(rfd2obj); |
| 317 | PyMem_DEL(wfd2obj); |
| 318 | PyMem_DEL(efd2obj); |
| 319 | #endif |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 320 | return ret; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 321 | } |
| 322 | |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 323 | static char select_doc[] = |
| 324 | "select(rlist, wlist, xlist[, timeout]) -> (rlist, wlist, xlist)\n\ |
| 325 | \n\ |
| 326 | Wait until one or more file descriptors are ready for some kind of I/O.\n\ |
| 327 | The first three arguments are lists of file descriptors to be waited for:\n\ |
| 328 | rlist -- wait until ready for reading\n\ |
| 329 | wlist -- wait until ready for writing\n\ |
| 330 | xlist -- wait for an ``exceptional condition''\n\ |
| 331 | If only one kind of condition is required, pass [] for the other lists.\n\ |
| 332 | A file descriptor is either a socket or file object, or a small integer\n\ |
| 333 | gotten from a fileno() method call on one of those.\n\ |
| 334 | \n\ |
| 335 | The optional 4th argument specifies a timeout in seconds; it may be\n\ |
| 336 | a floating point number to specify fractions of seconds. If it is absent\n\ |
| 337 | or None, the call will never time out.\n\ |
| 338 | \n\ |
| 339 | The return value is a tuple of three lists corresponding to the first three\n\ |
| 340 | arguments; each contains the subset of the corresponding file descriptors\n\ |
| 341 | that are ready.\n\ |
| 342 | \n\ |
| 343 | *** IMPORTANT NOTICE ***\n\ |
| 344 | On Windows, only sockets are supported; on Unix, all file descriptors."; |
| 345 | |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 346 | |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 347 | static PyMethodDef select_methods[] = { |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 348 | {"select", select_select, 1, select_doc}, |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 349 | {0, 0}, /* sentinel */ |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 350 | }; |
| 351 | |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 352 | static char module_doc[] = |
| 353 | "This module supports asynchronous I/O on multiple file descriptors.\n\ |
| 354 | \n\ |
| 355 | *** IMPORTANT NOTICE ***\n\ |
| 356 | On Windows, only sockets are supported; on Unix, all file descriptors."; |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 357 | |
Guido van Rossum | 3886bb6 | 1998-12-04 18:50:17 +0000 | [diff] [blame] | 358 | DL_EXPORT(void) |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 359 | initselect() |
| 360 | { |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 361 | PyObject *m, *d; |
Guido van Rossum | 1d8fb2d | 1998-06-28 16:54:49 +0000 | [diff] [blame] | 362 | m = Py_InitModule3("select", select_methods, module_doc); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 363 | d = PyModule_GetDict(m); |
Guido van Rossum | 0cb96de | 1997-10-01 04:29:29 +0000 | [diff] [blame] | 364 | SelectError = PyErr_NewException("select.error", NULL, NULL); |
Barry Warsaw | e4ac0aa | 1996-12-12 00:04:35 +0000 | [diff] [blame] | 365 | PyDict_SetItemString(d, "error", SelectError); |
Guido van Rossum | ed233a5 | 1992-06-23 09:07:03 +0000 | [diff] [blame] | 366 | } |