Annotation of libwww/Library/src/HTChannl.c, revision 2.12.2.2
2.1 frystyk 1: /* HTChannl.c
2: ** CONTAINS STREAMS FOR READING AND WRITING TO AND FROM A TRANSPORT
3: **
4: ** (c) COPYRIGHT MIT 1995.
5: ** Please first read the full copyright statement in the file COPYRIGH.
2.12.2.2! eric 6: ** @(#) $Id: HTChannl.c,v 2.12.2.1 1996/10/29 21:26:43 eric Exp $
2.1 frystyk 7: **
8: **
9: ** HISTORY:
10: ** April 96 HFN Written
11: */
12:
13: /* Library Include files */
14: #include "sysdep.h"
15: #include "WWWUtil.h"
16: #include "HTAlert.h"
2.10 frystyk 17: #include "HTHost.h"
2.1 frystyk 18: #include "HTError.h"
19: #include "HTChannl.h" /* Implemented here */
20:
21: #define HASH_SIZE 67
22: #define HASH(s) ((s) % HASH_SIZE)
23:
24: struct _HTChannel {
25: SOCKET sockfd; /* Socket */
26: FILE * fp;
27: HTInputStream * input; /* Input stream */
28: HTOutputStream * output; /* Output stream */
29: BOOL active; /* Active or passive channel */
30: int semaphore; /* On channel use */
2.10 frystyk 31: HTHost * host; /* Zombie connections */
2.1 frystyk 32: };
33:
34: struct _HTInputStream {
35: const HTInputStreamClass * isa;
36: };
37:
38: struct _HTOutputStream {
39: const HTOutputStreamClass * isa;
40: };
41:
42: PRIVATE HTList ** channels = NULL; /* List of channels */
43:
44: /* ------------------------------------------------------------------------- */
45:
46: PRIVATE void free_channel (HTChannel * ch)
47: {
48: if (ch) {
49:
50: /* Close the input and output stream */
2.11 frystyk 51: if (ch->input) {
52: (*ch->input->isa->close)(ch->input);
53: ch->input = NULL;
54: }
55: if (ch->output) {
56: (*ch->output->isa->close)(ch->output);
57: ch->output = NULL;
58: }
2.1 frystyk 59:
60: /* Close the socket */
61: if (ch->sockfd != INVSOC) {
62: NETCLOSE(ch->sockfd);
2.12.2.1 eric 63: /* HTEvent_unregister(ch->sockfd, all options); */
2.10 frystyk 64: HTNet_decreaseSocket();
2.1 frystyk 65: if (PROT_TRACE)
66: HTTrace("Channel..... Deleted %p, socket %d\n", ch,ch->sockfd);
67: }
2.12.2.2! eric 68: ch->sockfd = INVSOC;
2.1 frystyk 69:
70: /* Close the file */
71: if (ch->fp) {
72: fclose(ch->fp);
73: if (PROT_TRACE)
74: HTTrace("Channel..... Deleted %p, file %p\n", ch, ch->fp);
75: }
76: HT_FREE(ch);
77: }
78: }
79:
80: /*
81: ** A channel is uniquely identified by a socket.
82: ** Note that we don't create the input and output stream - they are
2.10 frystyk 83: ** created later.
2.1 frystyk 84: **
85: ** We only keep a hash on sockfd's as we don't have to look for channels
86: ** for ANSI file descriptors.
87: */
2.12.2.1 eric 88: PUBLIC HTChannel * HTChannel_new (SOCKET sockfd, BOOL active)
2.1 frystyk 89: {
2.12.2.1 eric 90: HTList * list = NULL;
91: HTChannel * ch = NULL;
92: int hash = sockfd < 0 ? 0 : HASH(sockfd);
93: if (PROT_TRACE) HTTrace("Channel..... Hash value is %d\n", hash);
94: if (!channels) {
95: if (!(channels = (HTList **) HT_CALLOC(HASH_SIZE,sizeof(HTList*))))
96: HT_OUTOFMEM("HTChannel_new");
2.1 frystyk 97: }
2.12.2.1 eric 98: if (!channels[hash]) channels[hash] = HTList_new();
99: list = channels[hash];
100: if ((ch = (HTChannel *) HT_CALLOC(1, sizeof(HTChannel))) == NULL)
101: HT_OUTOFMEM("HTChannel_new");
102: ch->sockfd = sockfd;
103: ch->active = active;
104: ch->semaphore = 1;
105: HTList_addObject(list, (void *) ch);
106:
107: if (PROT_TRACE) HTTrace("Channel..... Added %p to list %p\n", ch,list);
108: return ch;
2.1 frystyk 109: }
110:
111: /*
112: ** Look for a channel object if we for some reason should have lost it
113: ** Returns NULL if nothing found
114: */
115: PUBLIC HTChannel * HTChannel_find (SOCKET sockfd)
116: {
117: if (channels && sockfd != INVSOC) {
118: int hash = HASH(sockfd);
119: HTList * list = channels[hash];
120: if (list) {
121: HTChannel * ch = NULL;
122: while ((ch = (HTChannel *) HTList_nextObject(list)))
123: if (ch->sockfd == sockfd) return ch;
124: }
125: }
126: return NULL;
127: }
128:
129: /*
130: ** When deleting a channel we first look at if there are no more requests
131: ** using the channel (the semaphore is <= 0). Then, if the socket supports
132: ** persistent connections then we register the channel in the Host cache
133: ** and wait until the other end closes it or we get a time out on our side
134: */
2.6 eric 135: PUBLIC BOOL HTChannel_delete (HTChannel * channel, int status)
2.1 frystyk 136: {
137: if (channel) {
2.2 frystyk 138: if (PROT_TRACE) HTTrace("Channel..... Delete %p with semaphore %d\n",
2.1 frystyk 139: channel, channel->semaphore);
140: /*
141: ** We call the free methods on both the input stream and the output
142: ** stream so that we can free up the stream pipes. However, note that
143: ** this doesn't mean that we close the input stream and output stream
144: ** them selves - only the generic streams
145: */
2.12 frystyk 146: if (status != HT_IGNORE) {
147: if (channel->input)
148: if (status == HT_INTERRUPTED)
149: (*channel->input->isa->abort)(channel->input, NULL);
150: else
151: (*channel->input->isa->_free)(channel->input);
152: if (channel->output)
153: if (status == HT_INTERRUPTED)
154: (*channel->output->isa->abort)(channel->output, NULL);
155: else
156: (*channel->output->isa->_free)(channel->output);
157: }
2.1 frystyk 158:
159: /*
160: ** Check whether this channel is used by other objects or we can
161: ** delete it and free memory.
162: */
2.12.2.2! eric 163: if (channel->semaphore <= 0 && channels && channel->sockfd != INVSOC) {
2.1 frystyk 164: int hash = HASH(channel->sockfd);
165: HTList * list = channels[hash];
166: if (list) {
167: HTList_removeObject(list, (void *) channel);
168: free_channel(channel);
169: return YES;
170: }
2.8 frystyk 171: } else
172: HTChannel_downSemaphore(channel);
2.1 frystyk 173: }
174: return NO;
175: }
176:
177: /* HTChannel_deleteAll
178: ** -------------------
179: ** Destroys all channels. This is called by HTLibTerminate(0
180: */
2.9 frystyk 181: PUBLIC BOOL HTChannel_deleteAll (void)
2.1 frystyk 182: {
183: if (channels) {
184: HTList * cur;
185: int cnt;
186: for (cnt=0; cnt<HASH_SIZE; cnt++) {
187: if ((cur = channels[cnt])) {
188: HTChannel * pres;
189: while ((pres = (HTChannel *) HTList_nextObject(cur)) != NULL)
190: free_channel(pres);
191: }
192: HTList_delete(channels[cnt]);
193: }
194: HT_FREE(channels);
195: }
196: return YES;
197: }
198:
199: /*
2.10 frystyk 200: ** Return the socket associated with this channel
2.1 frystyk 201: */
2.10 frystyk 202: PUBLIC SOCKET HTChannel_socket (HTChannel * channel)
2.1 frystyk 203: {
2.10 frystyk 204: return channel ? channel->sockfd : INVSOC;
2.1 frystyk 205: }
206:
2.12.2.1 eric 207: PUBLIC void HTChannel_setSocket (HTChannel * channel, SOCKET socket)
208: {
209: if (channel)
210: channel->sockfd = socket;
211: }
212:
2.10 frystyk 213: /*
214: ** Return the file descriptor associated with this channel
215: */
216: PUBLIC FILE * HTChannel_file (HTChannel * channel)
2.1 frystyk 217: {
2.10 frystyk 218: return channel ? channel->fp : NULL;
2.1 frystyk 219: }
220:
221: /*
2.10 frystyk 222: ** We keep the associated Host object in case we have a
223: ** sleeping connection.
2.1 frystyk 224: */
2.10 frystyk 225: PUBLIC BOOL HTChannel_setHost (HTChannel * ch, HTHost * host)
2.1 frystyk 226: {
2.12.2.1 eric 227: if (ch) {
2.10 frystyk 228: ch->host = host;
229: return YES;
230: }
231: return NO;
2.4 frystyk 232: }
233:
2.10 frystyk 234: PUBLIC HTHost * HTChannel_host (HTChannel * ch)
2.4 frystyk 235: {
2.10 frystyk 236: return (ch ? ch->host : NULL);
2.1 frystyk 237: }
238:
239: /*
240: ** Increase the semaphore for this channel
241: */
242: PUBLIC void HTChannel_upSemaphore (HTChannel * channel)
243: {
244: if (channel) {
245: channel->semaphore++;
246: if (PROT_TRACE)
247: HTTrace("Channel..... Semaphore increased to %d for channel %p\n",
248: channel->semaphore, channel);
249: }
250: }
251:
252: /*
253: ** Decrease the semaphore for this channel
254: */
255: PUBLIC void HTChannel_downSemaphore (HTChannel * channel)
256: {
257: if (channel) {
258: channel->semaphore--;
259: if (channel->semaphore <= 0) channel->semaphore = 0;
260: if (PROT_TRACE)
261: HTTrace("Channel..... Semaphore decreased to %d for channel %p\n",
2.7 frystyk 262: channel->semaphore, channel);
263: }
264: }
265:
266: /*
267: ** Explicitly set the semaphore for this channel
268: */
269: PUBLIC void HTChannel_setSemaphore (HTChannel * channel, int semaphore)
270: {
271: if (channel) {
272: channel->semaphore = semaphore;
273: if (channel->semaphore <= 0) channel->semaphore = 0;
274: if (PROT_TRACE)
275: HTTrace("Channel..... Semaphore set to %d for channel %p\n",
2.1 frystyk 276: channel->semaphore, channel);
277: }
278: }
279:
280: /*
281: ** Create the input stream and bind it to the channel
282: ** Please read the description in the HTIOStream module on the parameters
283: */
2.10 frystyk 284: PUBLIC BOOL HTChannel_setInput (HTChannel * ch, HTInputStream * input)
2.1 frystyk 285: {
286: if (ch) {
287: ch->input = input;
288: return YES;
289: }
290: return NO;
291: }
292:
293: PUBLIC HTInputStream * HTChannel_input (HTChannel * ch)
294: {
295: return ch ? ch->input : NULL;
296: }
297:
298: /*
299: ** Create the output stream and bind it to the channel
300: ** Please read the description in the HTIOStream module on the parameters
301: */
2.10 frystyk 302: PUBLIC BOOL HTChannel_setOutput (HTChannel * ch, HTOutputStream * output)
2.1 frystyk 303: {
304: if (ch) {
305: ch->output = output;
306: return YES;
307: }
308: return NO;
309: }
310:
311: PUBLIC HTOutputStream * HTChannel_output (HTChannel * ch)
312: {
313: return ch ? ch->output : NULL;
314: }
315:
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