| 1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326 |
872
872
872
872
872
872
872
872
872
872
872
872
872
872
872
872
872
872
589
589
396
396
193
193
589
872
24
6
1
1
1
1
31
1
30
28
28
28
28
28
30
30
30
30
30
30
7
7
7
4
4
7
13
7
1
1
1
1
1
872
7
7
7
872
872
18
18
17
872
3
3
872
27
15
15
15
17
17
872
6
872
12
12
12
872
3
3
3
3
3
872
3
4
1
1
872
872
4
4
4
2
2
872
32
32
32
10
10
32
872
872
519
519
429
519
872
144
144
144
144
144
144
632
540
540
540
497
497
497
22
475
497
540
540
92
92
92
92
92
144
144
429
69
69
69
69
122
69
1
69
360
22
22
22
22
22
144
387
387
144
531
531
2
529
159
159
118
41
1
40
26
14
1
13
13
159
89
89
70
70
70
1
70
25
370
33
33
407
407
407
407
407
407
69
407
31
407
144
144
135
1
134
134
133
144
134
134
134
872
134
134
134
134
134
134
144
872
872
91
91
86
86
5
5
91
91
91
91
91
872
50
50
50
50
50
50
257
88
50
45
45
872
60
60
41
41
19
19
60
60
60
60
60
872
54
54
872
58
58
58
57
58
57
57
1
1
58
58
58
58
58
57
57
57
1
1
1
58
58
58
58
58
58
872
59
58
58
58
57
57
57
1
1
56
56
57
55
39
39
18
18
17
18
16
16
16
16
18
18
872
1
1
1
1
872
1
1
1
1
1
58
58
284
284
1
1
283
1
282
58
52
52
52
52
58
57
57
58
58
58
872
872
346
872
344
344
230
4
219
7
114
344
344
872
1127
4
1127
30
1097
694
694
595
694
403
94
94
94
94
309
2
307
307
1127
344
872
351
351
342
342
9
3
6
6
348
128
220
2
346
346
346
346
346
12422
346
346
872
314
309
309
309
309
308
872
793
793
301
872
309
309
309
309
309
309
309
309
309
309
309
309
305
305
305
30
275
305
193
305
305
305
4
4
4
4
301
305
305
872
872
305
304
1005
943
62
872
872
309
309
309
309
309
309
94
94
309
309
309
308
4
4
304
307
307
1016
992
94
94
898
589
589
396
396
396
307
307
307
307
1016
307
307
872
4
872
29
29
29
16
13
29
29
23
23
23
23
6
872
872
3
872
872
35
35
35
35
35
35
35
35
35
35
3
3
35
103
103
3
3
1
2
1
1
34
34
3
9
3
6
34
34
34
4
4
4
34
34
872
872
8
3
3
3
2
2
3
3
5
872
2
2
2
2
2
2
2
2
872
872
6
6
6
6
6
5
6
6
3
3
872
| (function () { 'use strict';
const StringDecoder = require('string_decoder').StringDecoder;
const EventEmitter = require('events').EventEmitter;
const net = require('net');
const dgram = require('dgram');
const assert = require('assert');
const util = require('util');
const debug = util.debuglog('child_process');
const constants = require('constants');
const Process = process.binding('process_wrap').Process;
const WriteWrap = process.binding('stream_wrap').WriteWrap;
const uv = process.binding('uv');
const spawn_sync = process.binding('spawn_sync');
const Pipe = process.binding('pipe_wrap').Pipe;
const TTY = process.binding('tty_wrap').TTY;
const TCP = process.binding('tcp_wrap').TCP;
const UDP = process.binding('udp_wrap').UDP;
const errnoException = util._errnoException;
function createSocket(pipe, readable) {
var s = new net.Socket({ handle: pipe });
if (readable) {
s.writable = false;
s.readable = true;
} else {
s.writable = true;
s.readable = false;
}
return s;
}
// this object contain function to convert TCP objects to native handle objects
// and back again.
const handleConversion = {
'net.Native': {
simultaneousAccepts: true,
send: function(message, handle) {
return handle;
},
got: function(message, handle, emit) {
emit(handle);
}
},
'net.Server': {
simultaneousAccepts: true,
send: function(message, server) {
return server._handle;
},
got: function(message, handle, emit) {
var server = new net.Server();
server.listen(handle, function() {
emit(server);
});
}
},
'net.Socket': {
send: function(message, socket) {
if (!socket._handle)
return;
// if the socket was created by net.Server
if (socket.server) {
// the slave should keep track of the socket
message.key = socket.server._connectionKey;
var firstTime = !this._channel.sockets.send[message.key];
var socketList = getSocketList('send', this, message.key);
// the server should no longer expose a .connection property
// and when asked to close it should query the socket status from
// the slaves
if (firstTime) socket.server._setupSlave(socketList);
// Act like socket is detached
socket.server._connections--;
}
// remove handle from socket object, it will be closed when the socket
// will be sent
var handle = socket._handle;
handle.onread = function() {};
socket._handle = null;
return handle;
},
postSend: function(handle) {
// Close the Socket handle after sending it
Eif (handle)
handle.close();
},
got: function(message, handle, emit) {
var socket = new net.Socket({handle: handle});
socket.readable = socket.writable = true;
// if the socket was created by net.Server we will track the socket
if (message.key) {
// add socket to connections list
var socketList = getSocketList('got', this, message.key);
socketList.add({
socket: socket
});
}
emit(socket);
}
},
'dgram.Native': {
simultaneousAccepts: false,
send: function(message, handle) {
return handle;
},
got: function(message, handle, emit) {
emit(handle);
}
},
'dgram.Socket': {
simultaneousAccepts: false,
send: function(message, socket) {
message.dgramType = socket.type;
return socket._handle;
},
got: function(message, handle, emit) {
var socket = new dgram.Socket(message.dgramType);
socket.bind(handle, function() {
emit(socket);
});
}
}
};
// This object keep track of the socket there are sended
function SocketListSend(slave, key) {
EventEmitter.call(this);
this.key = key;
this.slave = slave;
}
util.inherits(SocketListSend, EventEmitter);
SocketListSend.prototype._request = function(msg, cmd, callback) {
var self = this;
if (!this.slave.connected) return onclose();
this.slave.send(msg);
function onclose() {
self.slave.removeListener('internalMessage', onreply);
callback(new Error('Slave closed before reply'));
}
function onreply(msg) {
if (!(msg.cmd === cmd && msg.key === self.key)) return;
self.slave.removeListener('disconnect', onclose);
self.slave.removeListener('internalMessage', onreply);
callback(null, msg);
}
this.slave.once('disconnect', onclose);
this.slave.on('internalMessage', onreply);
};
SocketListSend.prototype.close = function close(callback) {
this._request({
cmd: 'NODE_SOCKET_NOTIFY_CLOSE',
key: this.key
}, 'NODE_SOCKET_ALL_CLOSED', callback);
};
SocketListSend.prototype.getConnections = function getConnections(callback) {
this._request({
cmd: 'NODE_SOCKET_GET_COUNT',
key: this.key
}, 'NODE_SOCKET_COUNT', function(err, msg) {
Iif (err) return callback(err);
callback(null, msg.count);
});
};
// This object keep track of the socket there are received
function SocketListReceive(slave, key) {
EventEmitter.call(this);
var self = this;
this.connections = 0;
this.key = key;
this.slave = slave;
function onempty() {
if (!self.slave.connected) return;
self.slave.send({
cmd: 'NODE_SOCKET_ALL_CLOSED',
key: self.key
});
}
this.slave.on('internalMessage', function(msg) {
if (msg.key !== self.key) return;
Iif (msg.cmd === 'NODE_SOCKET_NOTIFY_CLOSE') {
// Already empty
if (self.connections === 0) return onempty();
// Wait for sockets to get closed
self.once('empty', onempty);
} else Iif (msg.cmd === 'NODE_SOCKET_GET_COUNT') {
if (!self.slave.connected) return;
self.slave.send({
cmd: 'NODE_SOCKET_COUNT',
key: self.key,
count: self.connections
});
}
});
}
util.inherits(SocketListReceive, EventEmitter);
SocketListReceive.prototype.add = function(obj) {
var self = this;
this.connections++;
// Notify previous owner of socket about its state change
obj.socket.once('close', function() {
self.connections--;
Eif (self.connections === 0) self.emit('empty');
});
};
function getSocketList(type, slave, key) {
var sockets = slave._channel.sockets[type];
var socketList = sockets[key];
if (!socketList) {
var Construct = type === 'send' ? SocketListSend : SocketListReceive;
socketList = sockets[key] = new Construct(slave, key);
}
return socketList;
}
const INTERNAL_PREFIX = 'NODE_';
function handleMessage(target, message, handle) {
var eventName = 'message';
if (message !== null &&
typeof message === 'object' &&
typeof message.cmd === 'string' &&
message.cmd.length > INTERNAL_PREFIX.length &&
message.cmd.slice(0, INTERNAL_PREFIX.length) === INTERNAL_PREFIX) {
eventName = 'internalMessage';
}
target.emit(eventName, message, handle);
}
function setupChannel(target, channel) {
target._channel = channel;
target._handleQueue = null;
var decoder = new StringDecoder('utf8');
var jsonBuffer = '';
channel.buffering = false;
channel.onread = function(nread, pool, recvHandle) {
// TODO(bnoordhuis) Check that nread > 0.
if (pool) {
jsonBuffer += decoder.write(pool);
var i, start = 0;
//Linebreak is used as a message end sign
while ((i = jsonBuffer.indexOf('\n', start)) >= 0) {
var json = jsonBuffer.slice(start, i);
var message = JSON.parse(json);
// There will be at most one NODE_HANDLE message in every chunk we
// read because SCM_RIGHTS messages don't get coalesced. Make sure
// that we deliver the handle with the right message however.
if (message && message.cmd === 'NODE_HANDLE')
handleMessage(target, message, recvHandle);
else
handleMessage(target, message, undefined);
start = i + 1;
}
jsonBuffer = jsonBuffer.slice(start);
this.buffering = jsonBuffer.length !== 0;
} else {
this.buffering = false;
target.disconnect();
channel.onread = nop;
channel.close();
maybeClose(target);
}
};
// object where socket lists will live
channel.sockets = { got: {}, send: {} };
// handlers will go through this
target.on('internalMessage', function(message, handle) {
// Once acknowledged - continue sending handles.
if (message.cmd === 'NODE_HANDLE_ACK') {
assert(Array.isArray(target._handleQueue));
var queue = target._handleQueue;
target._handleQueue = null;
queue.forEach(function(args) {
target._send(args.message, args.handle, false);
});
// Process a pending disconnect (if any).
if (!target.connected && target._channel && !target._handleQueue)
target._disconnect();
return;
}
if (message.cmd !== 'NODE_HANDLE') return;
// Acknowledge handle receival. Don't emit error events (for example if
// the other side has disconnected) because this call to send() is not
// initiated by the user and it shouldn't be fatal to be unable to ACK
// a message.
target._send({ cmd: 'NODE_HANDLE_ACK' }, null, true);
var obj = handleConversion[message.type];
// Update simultaneous accepts on Windows
Iif (process.platform === 'win32') {
handle._simultaneousAccepts = false;
net._setSimultaneousAccepts(handle);
}
// Convert handle object
obj.got.call(this, message, handle, function(handle) {
handleMessage(target, message.msg, handle);
});
});
target.send = function(message, handle) {
Iif (!this.connected)
this.emit('error', new Error('channel closed'));
else
this._send(message, handle, false);
};
target._send = function(message, handle, swallowErrors) {
assert(this.connected || this._channel);
if (message === undefined)
throw new TypeError('message cannot be undefined');
// package messages with a handle object
if (handle) {
// this message will be handled by an internalMessage event handler
message = {
cmd: 'NODE_HANDLE',
type: null,
msg: message
};
if (handle instanceof net.Socket) {
message.type = 'net.Socket';
} else if (handle instanceof net.Server) {
message.type = 'net.Server';
} else if (handle instanceof TCP || handle instanceof Pipe) {
message.type = 'net.Native';
} else if (handle instanceof dgram.Socket) {
message.type = 'dgram.Socket';
} else Eif (handle instanceof UDP) {
message.type = 'dgram.Native';
} else {
throw new TypeError("This handle type can't be sent");
}
// Queue-up message and handle if we haven't received ACK yet.
if (this._handleQueue) {
this._handleQueue.push({ message: message.msg, handle: handle });
return;
}
var obj = handleConversion[message.type];
// convert TCP object to native handle object
handle =
handleConversion[message.type].send.call(target, message, handle);
// If handle was sent twice, or it is impossible to get native handle
// out of it - just send a text without the handle.
if (!handle)
message = message.msg;
// Update simultaneous accepts on Windows
if (obj.simultaneousAccepts) {
net._setSimultaneousAccepts(handle);
}
} else if (this._handleQueue &&
!(message && message.cmd === 'NODE_HANDLE_ACK')) {
// Queue request anyway to avoid out-of-order messages.
this._handleQueue.push({ message: message, handle: null });
return;
}
var req = new WriteWrap();
req.oncomplete = nop;
var string = JSON.stringify(message) + '\n';
var err = channel.writeUtf8String(req, string, handle);
Iif (err) {
if (!swallowErrors)
this.emit('error', errnoException(err, 'write'));
} else if (handle && !this._handleQueue) {
this._handleQueue = [];
}
if (obj && obj.postSend) {
req.oncomplete = obj.postSend.bind(null, handle);
}
/* If the master is > 2 read() calls behind, please stop sending. */
return channel.writeQueueSize < (65536 * 2);
};
// connected will be set to false immediately when a disconnect() is
// requested, even though the channel might still be alive internally to
// process queued messages. The three states are distinguished as follows:
// - disconnect() never requested: _channel is not null and connected
// is true
// - disconnect() requested, messages in the queue: _channel is not null
// and connected is false
// - disconnect() requested, channel actually disconnected: _channel is
// null and connected is false
target.connected = true;
target.disconnect = function() {
if (!this.connected) {
this.emit('error', new Error('IPC channel is already disconnected'));
return;
}
// Do not allow any new messages to be written.
this.connected = false;
// If there are no queued messages, disconnect immediately. Otherwise,
// postpone the disconnect so that it happens internally after the
// queue is flushed.
if (!this._handleQueue)
this._disconnect();
};
target._disconnect = function() {
assert(this._channel);
// This marks the fact that the channel is actually disconnected.
this._channel = null;
var fired = false;
function finish() {
Iif (fired) return;
fired = true;
channel.close();
target.emit('disconnect');
}
// If a message is being read, then wait for it to complete.
Iif (channel.buffering) {
this.once('message', finish);
this.once('internalMessage', finish);
return;
}
process.nextTick(finish);
};
channel.readStart();
}
function nop() { }
exports.fork = function(modulePath /*, args, options*/) {
// Get options and args arguments.
var options, args, execArgv;
if (Array.isArray(arguments[1])) {
args = arguments[1];
options = util._extend({}, arguments[2]);
} else {
args = [];
options = util._extend({}, arguments[1]);
}
// Prepare arguments for fork:
execArgv = options.execArgv || process.execArgv;
args = execArgv.concat([modulePath], args);
// Leave stdin open for the IPC channel. stdout and stderr should be the
// same as the parent's if silent isn't set.
options.stdio = options.silent ? ['pipe', 'pipe', 'pipe', 'ipc'] :
[0, 1, 2, 'ipc'];
options.execPath = options.execPath || process.execPath;
return spawn(options.execPath, args, options);
};
exports._forkChild = function(fd) {
// set process.send()
var p = new Pipe(true);
p.open(fd);
p.unref();
setupChannel(process, p);
var refs = 0;
process.on('newListener', function(name) {
if (name !== 'message' && name !== 'disconnect') return;
if (++refs === 1) p.ref();
});
process.on('removeListener', function(name) {
Iif (name !== 'message' && name !== 'disconnect') return;
if (--refs === 0) p.unref();
});
};
function normalizeExecArgs(command /*, options, callback */) {
var file, args, options, callback;
if (typeof arguments[1] === 'function') {
options = undefined;
callback = arguments[1];
} else {
options = arguments[1];
callback = arguments[2];
}
Iif (process.platform === 'win32') {
file = process.env.comspec || 'cmd.exe';
args = ['/s', '/c', '"' + command + '"'];
// Make a shallow copy before patching so we don't clobber the user's
// options object.
options = util._extend({}, options);
options.windowsVerbatimArguments = true;
} else {
file = '/bin/sh';
args = ['-c', command];
}
Iif (options && options.shell)
file = options.shell;
return {
cmd: command,
file: file,
args: args,
options: options,
callback: callback
};
}
exports.exec = function(command /*, options, callback */) {
var opts = normalizeExecArgs.apply(null, arguments);
return exports.execFile(opts.file,
opts.args,
opts.options,
opts.callback);
};
exports.execFile = function(file /* args, options, callback */) {
var args, callback;
var options = {
encoding: 'utf8',
timeout: 0,
maxBuffer: 200 * 1024,
killSignal: 'SIGTERM',
cwd: null,
env: null
};
// Parse the parameters.
if (typeof arguments[arguments.length - 1] === 'function') {
callback = arguments[arguments.length - 1];
}
if (Array.isArray(arguments[1])) {
args = arguments[1];
options = util._extend(options, arguments[2]);
} else {
args = [];
options = util._extend(options, arguments[1]);
}
var child = spawn(file, args, {
cwd: options.cwd,
env: options.env,
gid: options.gid,
uid: options.uid,
windowsVerbatimArguments: !!options.windowsVerbatimArguments
});
var encoding;
var _stdout;
var _stderr;
if (options.encoding !== 'buffer' && Buffer.isEncoding(options.encoding)) {
encoding = options.encoding;
_stdout = '';
_stderr = '';
} else {
_stdout = [];
_stderr = [];
encoding = null;
}
var stdoutLen = 0;
var stderrLen = 0;
var killed = false;
var exited = false;
var timeoutId;
var ex = null;
function exithandler(code, signal) {
if (exited) return;
exited = true;
Iif (timeoutId) {
clearTimeout(timeoutId);
timeoutId = null;
}
if (!callback) return;
// merge chunks
var stdout;
var stderr;
if (!encoding) {
stdout = Buffer.concat(_stdout);
stderr = Buffer.concat(_stderr);
} else {
stdout = _stdout;
stderr = _stderr;
}
if (ex) {
// Will be handled later
} else if (code === 0 && signal === null) {
callback(null, stdout, stderr);
return;
}
var cmd = file;
if (args.length !== 0)
cmd += ' ' + args.join(' ');
if (!ex) {
ex = new Error('Command failed: ' + cmd + '\n' + stderr);
ex.killed = child.killed || killed;
ex.code = code < 0 ? uv.errname(code) : code;
ex.signal = signal;
}
ex.cmd = cmd;
callback(ex, stdout, stderr);
}
function errorhandler(e) {
ex = e;
child.stdout.destroy();
child.stderr.destroy();
exithandler();
}
function kill() {
child.stdout.destroy();
child.stderr.destroy();
killed = true;
try {
child.kill(options.killSignal);
} catch (e) {
ex = e;
exithandler();
}
}
Iif (options.timeout > 0) {
timeoutId = setTimeout(function() {
kill();
timeoutId = null;
}, options.timeout);
}
child.stdout.addListener('data', function(chunk) {
stdoutLen += chunk.length;
if (stdoutLen > options.maxBuffer) {
ex = new Error('stdout maxBuffer exceeded.');
kill();
} else {
if (!encoding)
_stdout.push(chunk);
else
_stdout += chunk;
}
});
child.stderr.addListener('data', function(chunk) {
stderrLen += chunk.length;
Iif (stderrLen > options.maxBuffer) {
ex = new Error('stderr maxBuffer exceeded.');
kill();
} else {
Iif (!encoding)
_stderr.push(chunk);
else
_stderr += chunk;
}
});
if (encoding) {
child.stderr.setEncoding(encoding);
child.stdout.setEncoding(encoding);
}
child.addListener('close', exithandler);
child.addListener('error', errorhandler);
return child;
};
var _deprecatedCustomFds = util.deprecate(function(options) {
options.stdio = options.customFds.map(function(fd) {
return fd === -1 ? 'pipe' : fd;
});
}, 'child_process: customFds option is deprecated, use stdio instead.');
function _convertCustomFds(options) {
Iif (options && options.customFds && !options.stdio) {
_deprecatedCustomFds(options);
}
}
function _validateStdio(stdio, sync) {
var ipc,
ipcFd;
// Replace shortcut with an array
if (typeof stdio === 'string') {
switch (stdio) {
case 'ignore': stdio = ['ignore', 'ignore', 'ignore']; break;
case 'pipe': stdio = ['pipe', 'pipe', 'pipe']; break;
case 'inherit': stdio = [0, 1, 2]; break;
default: throw new TypeError('Incorrect value of stdio option: ' + stdio);
}
} else Iif (!Array.isArray(stdio)) {
throw new TypeError('Incorrect value of stdio option: ' +
util.inspect(stdio));
}
// At least 3 stdio will be created
// Don't concat() a new Array() because it would be sparse, and
// stdio.reduce() would skip the sparse elements of stdio.
// See http://stackoverflow.com/a/5501711/3561
while (stdio.length < 3) stdio.push(undefined);
// Translate stdio into C++-readable form
// (i.e. PipeWraps or fds)
stdio = stdio.reduce(function(acc, stdio, i) {
function cleanup() {
acc.filter(function(stdio) {
return stdio.type === 'pipe' || stdio.type === 'ipc';
}).forEach(function(stdio) {
if (stdio.handle)
stdio.handle.close();
});
}
// Defaults
if (stdio === null || stdio === undefined) {
stdio = i < 3 ? 'pipe' : 'ignore';
}
if (stdio === null || stdio === 'ignore') {
acc.push({type: 'ignore'});
} else if (stdio === 'pipe' || typeof stdio === 'number' && stdio < 0) {
var a = {
type: 'pipe',
readable: i === 0,
writable: i !== 0
};
if (!sync)
a.handle = new Pipe();
acc.push(a);
} else if (stdio === 'ipc') {
Iif (sync || ipc !== undefined) {
// Cleanup previously created pipes
cleanup();
if (!sync)
throw new Error('Child process can have only one IPC pipe');
else
throw new Error('You cannot use IPC with synchronous forks');
}
ipc = new Pipe(true);
ipcFd = i;
acc.push({
type: 'pipe',
handle: ipc,
ipc: true
});
} else if (stdio === 'inherit') {
acc.push({
type: 'inherit',
fd: i
});
} else Eif (typeof stdio === 'number' || typeof stdio.fd === 'number') {
acc.push({
type: 'fd',
fd: stdio.fd || stdio
});
} else if (getHandleWrapType(stdio) || getHandleWrapType(stdio.handle) ||
getHandleWrapType(stdio._handle)) {
var handle = getHandleWrapType(stdio) ?
stdio :
getHandleWrapType(stdio.handle) ? stdio.handle : stdio._handle;
acc.push({
type: 'wrap',
wrapType: getHandleWrapType(handle),
handle: handle
});
} else if (stdio instanceof Buffer || typeof stdio === 'string') {
if (!sync) {
cleanup();
throw new TypeError('Asynchronous forks do not support Buffer input: ' +
util.inspect(stdio));
}
} else {
// Cleanup
cleanup();
throw new TypeError('Incorrect value for stdio stream: ' +
util.inspect(stdio));
}
return acc;
}, []);
return {stdio: stdio, ipc: ipc, ipcFd: ipcFd};
}
function normalizeSpawnArguments(file /*, args, options*/) {
var args, options;
if (Array.isArray(arguments[1])) {
args = arguments[1].slice(0);
options = arguments[2];
} else if (arguments[1] !== undefined &&
(arguments[1] === null || typeof arguments[1] !== 'object')) {
throw new TypeError('Incorrect value of args option');
} else {
args = [];
options = arguments[1];
}
if (options === undefined)
options = {};
else if (options === null || typeof options !== 'object')
throw new TypeError('options argument must be an object');
options = util._extend({}, options);
args.unshift(file);
var env = options.env || process.env;
var envPairs = [];
for (var key in env) {
envPairs.push(key + '=' + env[key]);
}
_convertCustomFds(options);
return {
file: file,
args: args,
options: options,
envPairs: envPairs
};
}
var spawn = exports.spawn = function(/*file, args, options*/) {
var opts = normalizeSpawnArguments.apply(null, arguments);
var options = opts.options;
var child = new ChildProcess();
debug('spawn', opts.args, options);
child.spawn({
file: opts.file,
args: opts.args,
cwd: options.cwd,
windowsVerbatimArguments: !!options.windowsVerbatimArguments,
detached: !!options.detached,
envPairs: opts.envPairs,
stdio: options.stdio,
uid: options.uid,
gid: options.gid
});
return child;
};
function maybeClose(subprocess) {
subprocess._closesGot++;
if (subprocess._closesGot == subprocess._closesNeeded) {
subprocess.emit('close', subprocess.exitCode, subprocess.signalCode);
}
}
function ChildProcess() {
EventEmitter.call(this);
var self = this;
this._closesNeeded = 1;
this._closesGot = 0;
this.connected = false;
this.signalCode = null;
this.exitCode = null;
this.killed = false;
this.spawnfile = null;
this._handle = new Process();
this._handle.owner = this;
this._handle.onexit = function(exitCode, signalCode) {
//
// follow 0.4.x behaviour:
//
// - normally terminated processes don't touch this.signalCode
// - signaled processes don't touch this.exitCode
//
// new in 0.9.x:
//
// - spawn failures are reported with exitCode < 0
//
var syscall = self.spawnfile ? 'spawn ' + self.spawnfile : 'spawn';
var err = (exitCode < 0) ? errnoException(exitCode, syscall) : null;
if (signalCode) {
self.signalCode = signalCode;
} else {
self.exitCode = exitCode;
}
if (self.stdin) {
self.stdin.destroy();
}
self._handle.close();
self._handle = null;
if (exitCode < 0) {
Eif (self.spawnfile)
err.path = self.spawnfile;
err.spawnargs = self.spawnargs.slice(1);
self.emit('error', err);
} else {
self.emit('exit', self.exitCode, self.signalCode);
}
// if any of the stdio streams have not been touched,
// then pull all the data through so that it can get the
// eof and emit a 'close' event.
// Do it on nextTick so that the user has one last chance
// to consume the output, if for example they only want to
// start reading the data once the process exits.
process.nextTick(flushStdio, self);
maybeClose(self);
};
}
util.inherits(ChildProcess, EventEmitter);
function flushStdio(subprocess) {
if (subprocess.stdio == null) return;
subprocess.stdio.forEach(function(stream, fd, stdio) {
if (!stream || !stream.readable || stream._consuming)
return;
stream.resume();
});
}
function getHandleWrapType(stream) {
if (stream instanceof Pipe) return 'pipe';
if (stream instanceof TTY) return 'tty';
if (stream instanceof TCP) return 'tcp';
if (stream instanceof UDP) return 'udp';
return false;
}
ChildProcess.prototype.spawn = function(options) {
var self = this,
ipc,
ipcFd,
// If no `stdio` option was given - use default
stdio = options.stdio || 'pipe';
stdio = _validateStdio(stdio, false);
ipc = stdio.ipc;
ipcFd = stdio.ipcFd;
stdio = options.stdio = stdio.stdio;
if (ipc !== undefined) {
// Let child process know about opened IPC channel
options.envPairs = options.envPairs || [];
options.envPairs.push('NODE_CHANNEL_FD=' + ipcFd);
}
this.spawnfile = options.file;
this.spawnargs = options.args;
var err = this._handle.spawn(options);
// Run-time errors should emit an error, not throw an exception.
if (err === uv.UV_EAGAIN ||
err === uv.UV_EMFILE ||
err === uv.UV_ENFILE ||
err === uv.UV_ENOENT) {
process.nextTick(onErrorNT, self, err);
// There is no point in continuing when we've hit EMFILE or ENFILE
// because we won't be able to set up the stdio file descriptors.
// It's kind of silly that the de facto spec for ENOENT (the test suite)
// mandates that stdio _is_ set up, even if there is no process on the
// receiving end, but it is what it is.
if (err !== uv.UV_ENOENT) return err;
} else Iif (err) {
// Close all opened fds on error
stdio.forEach(function(stdio) {
if (stdio.type === 'pipe') {
stdio.handle.close();
}
});
this._handle.close();
this._handle = null;
throw errnoException(err, 'spawn');
}
this.pid = this._handle.pid;
stdio.forEach(function(stdio, i) {
if (stdio.type === 'ignore') return;
if (stdio.ipc) {
self._closesNeeded++;
return;
}
if (stdio.handle) {
// when i === 0 - we're dealing with stdin
// (which is the only one writable pipe)
stdio.socket = createSocket(self.pid !== 0 ? stdio.handle : null, i > 0);
if (i > 0 && self.pid !== 0) {
self._closesNeeded++;
stdio.socket.on('close', function() {
maybeClose(self);
});
}
}
});
this.stdin = stdio.length >= 1 && stdio[0].socket !== undefined ?
stdio[0].socket : null;
this.stdout = stdio.length >= 2 && stdio[1].socket !== undefined ?
stdio[1].socket : null;
this.stderr = stdio.length >= 3 && stdio[2].socket !== undefined ?
stdio[2].socket : null;
this.stdio = stdio.map(function(stdio) {
return stdio.socket === undefined ? null : stdio.socket;
});
// Add .send() method and start listening for IPC data
if (ipc !== undefined) setupChannel(this, ipc);
return err;
};
function onErrorNT(self, err) {
self._handle.onexit(err);
}
ChildProcess.prototype.kill = function(sig) {
var signal;
Iif (sig === 0) {
signal = 0;
} else if (!sig) {
signal = constants['SIGTERM'];
} else {
signal = constants[sig];
}
Iif (signal === undefined) {
throw new Error('Unknown signal: ' + sig);
}
if (this._handle) {
var err = this._handle.kill(signal);
Eif (err === 0) {
/* Success. */
this.killed = true;
return true;
}
if (err === uv.UV_ESRCH) {
/* Already dead. */
} else if (err === uv.UV_EINVAL || err === uv.UV_ENOSYS) {
/* The underlying platform doesn't support this signal. */
throw errnoException(err, 'kill');
} else {
/* Other error, almost certainly EPERM. */
this.emit('error', errnoException(err, 'kill'));
}
}
/* Kill didn't succeed. */
return false;
};
ChildProcess.prototype.ref = function() {
if (this._handle) this._handle.ref();
};
ChildProcess.prototype.unref = function() {
Eif (this._handle) this._handle.unref();
};
function lookupSignal(signal) {
if (typeof signal === 'number')
return signal;
if (!(signal in constants))
throw new Error('Unknown signal: ' + signal);
return constants[signal];
}
function spawnSync(/*file, args, options*/) {
var opts = normalizeSpawnArguments.apply(null, arguments);
var options = opts.options;
var i;
debug('spawnSync', opts.args, options);
options.file = opts.file;
options.args = opts.args;
options.envPairs = opts.envPairs;
Iif (options.killSignal)
options.killSignal = lookupSignal(options.killSignal);
options.stdio = _validateStdio(options.stdio || 'pipe', true).stdio;
if (options.input) {
var stdin = options.stdio[0] = util._extend({}, options.stdio[0]);
stdin.input = options.input;
}
// We may want to pass data in on any given fd, ensure it is a valid buffer
for (i = 0; i < options.stdio.length; i++) {
var input = options.stdio[i] && options.stdio[i].input;
if (input != null) {
var pipe = options.stdio[i] = util._extend({}, options.stdio[i]);
if (Buffer.isBuffer(input))
pipe.input = input;
else if (typeof input === 'string')
pipe.input = new Buffer(input, options.encoding);
else
throw new TypeError(util.format(
'stdio[%d] should be Buffer or string not %s',
i,
typeof input));
}
}
var result = spawn_sync.spawn(options);
if (result.output && options.encoding) {
for (i = 0; i < result.output.length; i++) {
if (!result.output[i])
continue;
result.output[i] = result.output[i].toString(options.encoding);
}
}
result.stdout = result.output && result.output[1];
result.stderr = result.output && result.output[2];
if (result.error) {
result.error = errnoException(result.error, 'spawnSync ' + opts.file);
result.error.path = opts.file;
result.error.spawnargs = opts.args.slice(1);
}
util._extend(result, opts);
return result;
}
exports.spawnSync = spawnSync;
function checkExecSyncError(ret) {
if (ret.error || ret.status !== 0) {
var err = ret.error;
ret.error = null;
if (!err) {
var msg = 'Command failed: ' +
(ret.cmd ? ret.cmd : ret.args.join(' ')) +
(ret.stderr ? '\n' + ret.stderr.toString() : '');
err = new Error(msg);
}
util._extend(err, ret);
return err;
}
return false;
}
function execFileSync(/*command, options*/) {
var opts = normalizeSpawnArguments.apply(null, arguments);
var inheritStderr = !opts.options.stdio;
var ret = spawnSync(opts.file, opts.args.slice(1), opts.options);
Eif (inheritStderr)
process.stderr.write(ret.stderr);
var err = checkExecSyncError(ret);
Iif (err)
throw err;
else
return ret.stdout;
}
exports.execFileSync = execFileSync;
function execSync(/*comand, options*/) {
var opts = normalizeExecArgs.apply(null, arguments);
var inheritStderr = opts.options ? !opts.options.stdio : true;
var ret = spawnSync(opts.file, opts.args, opts.options);
ret.cmd = opts.cmd;
if (inheritStderr)
process.stderr.write(ret.stderr);
var err = checkExecSyncError(ret);
if (err)
throw err;
else
return ret.stdout;
}
exports.execSync = execSync;
}());
|