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root/radiance/ray/src/hd/rholo4.c
Revision: 3.3
Committed: Tue Nov 4 09:58:24 1997 UTC (26 years, 5 months ago) by gregl
Content type: text/plain
Branch: MAIN
Changes since 3.2: +13 -10 lines
Log Message:
minor bug fixes

File Contents

# User Rev Content
1 gregl 3.1 /* Copyright (c) 1997 Silicon Graphics, Inc. */
2    
3     #ifndef lint
4     static char SCCSid[] = "$SunId$ SGI";
5     #endif
6    
7     /*
8     * Holodeck display process communication
9     */
10    
11     #include "rholo.h"
12     #include "rhdisp.h"
13 gregl 3.2 #include <sys/uio.h>
14 gregl 3.1
15 gregl 3.2 #ifndef HDSUF
16     #define HDSUF ".hdisp"
17     #endif
18 gregl 3.1
19 gregl 3.2 static int inp_flags;
20     static int dpd[3];
21     static int pipesiz;
22    
23    
24     disp_open(dname) /* open the named display driver */
25 gregl 3.1 char *dname;
26     {
27 gregl 3.2 char dpath[128], *com[2];
28     int i;
29    
30     #ifdef DEVPATH
31     sprintf(dpath, "%s/%s%s", DEVPATH, dname, HDSUF);
32     #else
33     sprintf(dpath, "dev/%s%s", dname, HDSUF);
34     #endif
35     com[0] = dpath; com[1] = NULL;
36     pipesiz = open_process(dpd, com);
37     if (pipesiz <= 0)
38     error(USER, "cannot start display process");
39     inp_flags = 0;
40     /* write out hologram grids */
41     for (i = 0; hdlist[i] != NULL; i++)
42     disp_result(DS_ADDHOLO, sizeof(HDGRID), (char *)hdlist[i]);
43 gregl 3.1 }
44    
45    
46 gregl 3.2 disp_packet(p) /* display a packet */
47     register PACKET *p;
48     {
49     disp_result(DS_BUNDLE, sizeof(PACKHEAD) + p->nr*sizeof(RAYVAL),
50     (char *)p);
51     }
52    
53    
54 gregl 3.1 disp_check(block) /* check display process */
55     int block;
56     {
57 gregl 3.2 MSGHEAD msg;
58     int n;
59     char *buf = NULL;
60    
61     if (pipesiz <= 0)
62     return(-1);
63 gregl 3.3 /* check read blocking */
64 gregl 3.2 if (block != (inp_flags == 0)) {
65     inp_flags = block ? 0 : FNONBLK;
66     if (fcntl(dpd[0], F_SETFL, inp_flags) < 0)
67     goto fcntlerr;
68     }
69     /* read message header */
70     n = read(dpd[0], (char *)&msg, sizeof(MSGHEAD));
71     if (n != sizeof(MSGHEAD)) {
72     if (n >= 0)
73     error(USER, "display process died");
74     if (errno != EAGAIN & errno != EINTR)
75     goto readerr;
76 gregl 3.3 return(2); /* acceptable failure */
77 gregl 3.2 }
78     if (msg.nbytes) { /* get the message body */
79     buf = (char *)malloc(msg.nbytes);
80     if (buf == NULL)
81     error(SYSTEM, "out of memory in disp_check");
82     if (fcntl(dpd[0], F_SETFL, inp_flags=0) < 0)
83     goto fcntlerr;
84     if (readbuf(dpd[0], buf, msg.nbytes) != msg.nbytes)
85     goto readerr;
86     }
87     switch (msg.type) { /* take appropriate action */
88     case DR_BUNDLE:
89     if (msg.nbytes != sizeof(PACKHEAD))
90     error(INTERNAL, "bad DR_BUNDLE from display process");
91     bundle_set(BS_ADD, (PACKHEAD *)buf, 1);
92     break;
93     case DR_NEWSET:
94     if (msg.nbytes % sizeof(PACKHEAD))
95     error(INTERNAL, "bad DR_NEWSET from display process");
96     disp_result(DS_STARTIMM, 0, NULL);
97     bundle_set(BS_NEW, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
98     disp_result(DS_ENDIMM, 0, NULL);
99     break;
100     case DR_ADDSET:
101     if (msg.nbytes % sizeof(PACKHEAD))
102     error(INTERNAL, "bad DR_ADDSET from display process");
103     disp_result(DS_STARTIMM, 0, NULL);
104     bundle_set(BS_ADD, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
105     disp_result(DS_ENDIMM, 0, NULL);
106     break;
107     case DR_DELSET:
108     if (msg.nbytes % sizeof(PACKHEAD))
109     error(INTERNAL, "bad DR_DELSET from display process");
110     bundle_set(BS_DEL, (PACKHEAD *)buf, msg.nbytes/sizeof(PACKHEAD));
111     break;
112     case DR_ATTEN:
113     if (msg.nbytes)
114     error(INTERNAL, "bad DR_ATTEN from display process");
115     /* send acknowledgement */
116     disp_result(DS_ACKNOW, 0, NULL);
117 gregl 3.3 return(disp_check(1)); /* block on following request */
118 gregl 3.2 case DR_SHUTDOWN:
119     if (msg.nbytes)
120     error(INTERNAL, "bad DR_SHUTDOWN from display process");
121     return(0); /* zero return signals shutdown */
122     default:
123     error(INTERNAL, "unrecognized request from display process");
124     }
125 gregl 3.3 if (msg.nbytes) /* clean up */
126 gregl 3.2 free(buf);
127     return(1); /* normal return value */
128     fcntlerr:
129     error(SYSTEM, "cannot change display blocking mode");
130     readerr:
131     error(SYSTEM, "error reading from display process");
132 gregl 3.1 }
133    
134    
135 gregl 3.2 int
136     disp_close() /* close our display process */
137 gregl 3.1 {
138 gregl 3.2 int rval;
139    
140     if (pipesiz <= 0)
141     return(-1);
142     disp_result(DS_SHUTDOWN, 0, NULL);
143     pipesiz = 0;
144     return(close_process(dpd));
145     }
146    
147    
148     disp_result(type, nbytes, p) /* send result message to display process */
149     int type, nbytes;
150     char *p;
151     {
152     struct iovec iov[2];
153     MSGHEAD msg;
154     int n;
155    
156 gregl 3.3 if (pipesiz <= 0)
157     return;
158 gregl 3.2 msg.type = type;
159     msg.nbytes = nbytes;
160     if (nbytes == 0 || sizeof(MSGHEAD)+nbytes > pipesiz) {
161 gregl 3.3 do
162     n = write(dpd[1], (char *)&msg, sizeof(MSGHEAD));
163     while (n < 0 && errno == EINTR);
164 gregl 3.2 if (n != sizeof(MSGHEAD))
165     goto writerr;
166     if (nbytes > 0) {
167     n = writebuf(dpd[1], p, nbytes);
168     if (n != nbytes)
169     goto writerr;
170     }
171     return;
172     }
173     iov[0].iov_base = (char *)&msg;
174     iov[0].iov_len = sizeof(MSGHEAD);
175     iov[1].iov_base = p;
176     iov[1].iov_len = nbytes;
177 gregl 3.3 do
178     n = writev(dpd[1], iov, 2);
179     while (n < 0 && errno == EINTR);
180     if (n == sizeof(MSGHEAD)+nbytes)
181 gregl 3.2 return;
182     writerr:
183     error(SYSTEM, "write error in disp_result");
184 gregl 3.1 }