| 1 |
/* Copyright (c) 1997 Regents of the University of California */
|
| 2 |
|
| 3 |
#ifndef lint
|
| 4 |
static char SCCSid[] = "$SunId$ LBL";
|
| 5 |
#endif
|
| 6 |
|
| 7 |
/*
|
| 8 |
* I/O routines for GL display process.
|
| 9 |
*/
|
| 10 |
|
| 11 |
#include "standard.h"
|
| 12 |
#include <sys/uio.h>
|
| 13 |
#include "gldisp.h"
|
| 14 |
#include "gderrs.h"
|
| 15 |
|
| 16 |
|
| 17 |
gdSendRequest(d, r) /* send a request across a connection */
|
| 18 |
GDconnect *d;
|
| 19 |
GDrequest *r;
|
| 20 |
{
|
| 21 |
unsigned char rbuf[10];
|
| 22 |
struct iovec iov[2];
|
| 23 |
/* encode header */
|
| 24 |
gdPutInt(rbuf, (int4)r->type, 2);
|
| 25 |
gdPutInt(rbuf+2, r->id, 4);
|
| 26 |
gdPutInt(rbuf+6, r->alen, 4);
|
| 27 |
if (r->alen == 0) /* write header, null body */
|
| 28 |
write(d->fdout, rbuf, 10);
|
| 29 |
else { /* write header and body */
|
| 30 |
iov[0].iov_base = (MEM_PTR)rbuf;
|
| 31 |
iov[0].iov_len = 10;
|
| 32 |
iov[1].iov_base = (MEM_PTR)r->args;
|
| 33 |
iov[1].iov_len = r->alen;
|
| 34 |
writev(d->fdout, iov, 2);
|
| 35 |
}
|
| 36 |
}
|
| 37 |
|
| 38 |
|
| 39 |
GDrequest *
|
| 40 |
gdRecvRequest(d) /* receive a request across a connection */
|
| 41 |
register GDconnect *d;
|
| 42 |
{
|
| 43 |
register GDrequest *r;
|
| 44 |
int type;
|
| 45 |
int4 id, alen;
|
| 46 |
unsigned char rbuf[10];
|
| 47 |
/* read header */
|
| 48 |
fread(rbuf, 1, 10, d->fpin);
|
| 49 |
if (feof(d->fpin))
|
| 50 |
return(NULL);
|
| 51 |
type = gdGetInt(rbuf, 2);
|
| 52 |
id = gdGetInt(rbuf+2, 4);
|
| 53 |
if (type < 0 | type > GD_NREQ) {
|
| 54 |
gdSendError(d, GD_E_UNRECOG, id);
|
| 55 |
return(NULL);
|
| 56 |
}
|
| 57 |
alen = gdGetInt(rbuf+6, 4);
|
| 58 |
r = (GDrequest *)malloc(sizeof(GDrequest)-GD_ARG0+alen);
|
| 59 |
if (r == NULL) {
|
| 60 |
gdSendError(d, GD_E_NOMEMOR, id);
|
| 61 |
return(NULL);
|
| 62 |
}
|
| 63 |
r->type = type;
|
| 64 |
r->id = id;
|
| 65 |
if ((r->alen = alen) > 0) { /* read arguments */
|
| 66 |
fread(r->args, 1, alen, d->fpin);
|
| 67 |
if (feof(d->fpin)) {
|
| 68 |
gdSendError(d, GD_E_ARGMISS, id);
|
| 69 |
gdFree(r);
|
| 70 |
return(NULL);
|
| 71 |
}
|
| 72 |
}
|
| 73 |
if (type == GD_R_Error) { /* our error */
|
| 74 |
gdReportError(d, (int)gdGetInt(r->args, 2), id);
|
| 75 |
gdFree(r);
|
| 76 |
return(NULL);
|
| 77 |
}
|
| 78 |
return(r); /* success! */
|
| 79 |
}
|
| 80 |
|
| 81 |
|
| 82 |
gdSendError(d, ec, id) /* send fatal error associated with a request */
|
| 83 |
GDconnect *d;
|
| 84 |
int ec;
|
| 85 |
int4 id;
|
| 86 |
{
|
| 87 |
GDrequest rq;
|
| 88 |
/* build error request */
|
| 89 |
rq.type = GD_R_Error;
|
| 90 |
rq.id = id;
|
| 91 |
gdPutInt(rq.args, (int4)ec, rq.alen=2);
|
| 92 |
gdSendRequest(d, &rq); /* send it */
|
| 93 |
gdClose(d); /* all errors are fatal */
|
| 94 |
}
|
| 95 |
|
| 96 |
|
| 97 |
gdReportError(d, ec, id) /* report fatal error to stderr */
|
| 98 |
GDconnect *d;
|
| 99 |
int ec;
|
| 100 |
int4 id;
|
| 101 |
{
|
| 102 |
fprintf(stderr, "RequestId %d: %s\nConnection %d closed.\n",
|
| 103 |
id, gdErrMsg[ec], d->cno);
|
| 104 |
gdClose(d); /* all errors are fatal */
|
| 105 |
}
|
| 106 |
|
| 107 |
|
| 108 |
GDconnect *
|
| 109 |
gdOpen(inp, outp, x, y) /* establish a client/server connection */
|
| 110 |
char *inp, *outp; /* named pipes, currently */
|
| 111 |
int x, y; /* (0,0) for client */
|
| 112 |
{
|
| 113 |
static int nconnections = 0;
|
| 114 |
register GDrequest *rp;
|
| 115 |
GDrequest rq;
|
| 116 |
register GDconnect *dp;
|
| 117 |
|
| 118 |
dp = (GDconnect *)malloc(sizeof(GDconnect));
|
| 119 |
if (dp == NULL) {
|
| 120 |
gdReportError(dp, GD_E_NOMEMOR, 0);
|
| 121 |
return(NULL);
|
| 122 |
}
|
| 123 |
dp->cno = ++nconnections;
|
| 124 |
if (!x) /* client opens to write first */
|
| 125 |
dp->fdout = open(outp, O_WRONLY);
|
| 126 |
dp->fpin = fopen(inp, "r");
|
| 127 |
if (dp->fpin == NULL)
|
| 128 |
goto connecterr;
|
| 129 |
if (x) /* server opens to write second */
|
| 130 |
dp->fdout = open(outp, O_WRONLY);
|
| 131 |
if (dp->fdout < 0)
|
| 132 |
goto connecterr;
|
| 133 |
if (x) { /* server sends resolution */
|
| 134 |
dp->xres = x; dp->yres = y;
|
| 135 |
rq.type = GD_R_Init;
|
| 136 |
rq.id = dp->cno;
|
| 137 |
rq.alen = 4;
|
| 138 |
gdPutInt(rq.args, (int4)x, 2);
|
| 139 |
gdPutInt(rq.args+2, (int4)y, 2);
|
| 140 |
gdSendRequest(dp, &rq);
|
| 141 |
} else { /* client receives resolution */
|
| 142 |
rp = gdRecvRequest(dp);
|
| 143 |
if (rp == NULL)
|
| 144 |
return(NULL);
|
| 145 |
if (rp->type != GD_R_Init)
|
| 146 |
goto connecterr;
|
| 147 |
dp->cno = rp->id;
|
| 148 |
dp->xres = gdGetInt(rp->args, 2);
|
| 149 |
dp->yres = gdGetInt(rp->args+2, 2);
|
| 150 |
gdFree(rp);
|
| 151 |
}
|
| 152 |
return(dp); /* success! */
|
| 153 |
connecterr:
|
| 154 |
gdReportError(dp, GD_E_CONNECT, 0);
|
| 155 |
return(NULL);
|
| 156 |
}
|
| 157 |
|
| 158 |
|
| 159 |
gdClose(d) /* close a display server/client connection */
|
| 160 |
register GDconnect *d;
|
| 161 |
{
|
| 162 |
if (d == NULL) return;
|
| 163 |
close(d->fdout);
|
| 164 |
fclose(d->fpin);
|
| 165 |
gdFree(d); /* free associated memory */
|
| 166 |
}
|
| 167 |
|
| 168 |
|
| 169 |
int4
|
| 170 |
gdGetInt(ab, n) /* get an n-byte integer from buffer ab */
|
| 171 |
register unsigned char *ab;
|
| 172 |
register int n; /* maximum length 4 */
|
| 173 |
{
|
| 174 |
register int4 res;
|
| 175 |
|
| 176 |
res = *ab&0x80 ? -1 : 0; /* sign extend */
|
| 177 |
while (n--)
|
| 178 |
res = res<<8 | *ab++;
|
| 179 |
return(res);
|
| 180 |
}
|
| 181 |
|
| 182 |
|
| 183 |
gdPutInt(ab, i, n) /* put an n-byte integer into buffer ab */
|
| 184 |
register unsigned char *ab;
|
| 185 |
register int4 i;
|
| 186 |
register int n;
|
| 187 |
{
|
| 188 |
while (n--)
|
| 189 |
*ab++ = i>>(n<<3) & 0xff;
|
| 190 |
}
|
| 191 |
|
| 192 |
|
| 193 |
double
|
| 194 |
gdGetReal(ab) /* get a 5-byte real value from buffer ab */
|
| 195 |
char *ab;
|
| 196 |
{
|
| 197 |
register int4 i;
|
| 198 |
register double d;
|
| 199 |
|
| 200 |
i = gdGetInt(ab, 4);
|
| 201 |
d = (i + (i>0 ? .5 : -.5)) * (1./0x7fffffff);
|
| 202 |
return(ldexp(d, (int)gdGetInt(ab+4,1)));
|
| 203 |
}
|
| 204 |
|
| 205 |
|
| 206 |
gdPutReal(ab, d) /* put a 5-byte real value to buffer ab */
|
| 207 |
unsigned char *ab;
|
| 208 |
double d;
|
| 209 |
{
|
| 210 |
int e;
|
| 211 |
|
| 212 |
gdPutInt(ab, (int4)(frexp(d,&e)*0x7fffffff), 4);
|
| 213 |
gdPutInt(ab+4, (int4)e, 1);
|
| 214 |
}
|
