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/* Copyright (c) 1997 Regents of the University of California */ |
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|
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#ifndef lint |
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static char SCCSid[] = "$SunId$ LBL"; |
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#endif |
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|
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/* |
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* I/O routines for GL display process. |
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*/ |
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|
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#include "standard.h" |
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#include <sys/uio.h> |
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#include "gldisp.h" |
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#include "gderrs.h" |
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|
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|
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gdSendRequest(d, r) /* send a request across a connection */ |
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GDconnect *d; |
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GDrequest *r; |
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{ |
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unsigned char rbuf[10]; |
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struct iovec iov[2]; |
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/* encode header */ |
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gdPutInt(rbuf, (int4)r->type, 2); |
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gdPutInt(rbuf+2, r->id, 4); |
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gdPutInt(rbuf+6, r->alen, 4); |
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if (r->alen == 0) /* write header, null body */ |
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write(d->fdout, rbuf, 10); |
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else { /* write header and body */ |
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iov[0].iov_base = (MEM_PTR)rbuf; |
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iov[0].iov_len = 10; |
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iov[1].iov_base = (MEM_PTR)r->args; |
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iov[1].iov_len = r->alen; |
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writev(d->fdout, iov, 2); |
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} |
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} |
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|
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|
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GDrequest * |
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gdRecvRequest(d) /* receive a request across a connection */ |
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register GDconnect *d; |
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{ |
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register GDrequest *r; |
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int type; |
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int4 id, alen; |
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unsigned char rbuf[10]; |
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/* read header */ |
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fread(rbuf, 1, 10, d->fpin); |
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if (feof(d->fpin)) |
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return(NULL); |
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type = gdGetInt(rbuf, 2); |
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id = gdGetInt(rbuf+2, 4); |
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if (type < 0 | type > GD_NREQ) { |
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gdSendError(d, GD_E_UNRECOG, id); |
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return(NULL); |
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} |
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alen = gdGetInt(rbuf+6, 4); |
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r = (GDrequest *)malloc(sizeof(GDrequest)-GD_ARG0+alen); |
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if (r == NULL) { |
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gdSendError(d, GD_E_NOMEMOR, id); |
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return(NULL); |
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} |
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r->type = type; |
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r->id = id; |
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if ((r->alen = alen) > 0) { /* read arguments */ |
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fread(r->args, 1, alen, d->fpin); |
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if (feof(d->fpin)) { |
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gdSendError(d, GD_E_ARGMISS, id); |
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gdFree(r); |
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return(NULL); |
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} |
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} |
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if (type == GD_R_Error) { /* our error */ |
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gdReportError(d, (int)gdGetInt(r->args, 2), id); |
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gdFree(r); |
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return(NULL); |
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} |
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return(r); /* success! */ |
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} |
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|
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|
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gdSendError(d, ec, id) /* send fatal error associated with a request */ |
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GDconnect *d; |
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int ec; |
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int4 id; |
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{ |
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GDrequest rq; |
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/* build error request */ |
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rq.type = GD_R_Error; |
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rq.id = id; |
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gdPutInt(rq.args, (int4)ec, rq.alen=2); |
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gdSendRequest(d, &rq); /* send it */ |
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gdClose(d); /* all errors are fatal */ |
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} |
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|
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|
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gdReportError(d, ec, id) /* report fatal error to stderr */ |
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GDconnect *d; |
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int ec; |
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int4 id; |
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{ |
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fprintf(stderr, "RequestId %d: %s\nConnection %d closed.\n", |
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id, gdErrMsg[ec], d->cno); |
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gdClose(d); /* all errors are fatal */ |
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} |
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|
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|
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GDconnect * |
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gdOpen(inp, outp, x, y) /* establish a client/server connection */ |
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char *inp, *outp; /* named pipes, currently */ |
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int x, y; /* (0,0) for client */ |
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{ |
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static int nconnections = 0; |
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register GDrequest *rp; |
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GDrequest rq; |
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register GDconnect *dp; |
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|
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dp = (GDconnect *)malloc(sizeof(GDconnect)); |
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if (dp == NULL) { |
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gdReportError(dp, GD_E_NOMEMOR, 0); |
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return(NULL); |
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} |
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dp->cno = ++nconnections; |
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if (!x) /* client opens to write first */ |
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dp->fdout = open(outp, O_WRONLY); |
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dp->fpin = fopen(inp, "r"); |
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if (dp->fpin == NULL) |
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goto connecterr; |
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if (x) /* server opens to write second */ |
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dp->fdout = open(outp, O_WRONLY); |
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if (dp->fdout < 0) |
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goto connecterr; |
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if (x) { /* server sends resolution */ |
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dp->xres = x; dp->yres = y; |
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rq.type = GD_R_Init; |
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rq.id = dp->cno; |
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rq.alen = 4; |
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gdPutInt(rq.args, (int4)x, 2); |
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gdPutInt(rq.args+2, (int4)y, 2); |
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gdSendRequest(dp, &rq); |
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} else { /* client receives resolution */ |
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rp = gdRecvRequest(dp); |
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if (rp == NULL) |
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return(NULL); |
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if (rp->type != GD_R_Init) |
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goto connecterr; |
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dp->cno = rp->id; |
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dp->xres = gdGetInt(rp->args, 2); |
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dp->yres = gdGetInt(rp->args+2, 2); |
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gdFree(rp); |
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} |
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return(dp); /* success! */ |
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connecterr: |
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gdReportError(dp, GD_E_CONNECT, 0); |
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return(NULL); |
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} |
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|
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|
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gdClose(d) /* close a display server/client connection */ |
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register GDconnect *d; |
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{ |
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if (d == NULL) return; |
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close(d->fdout); |
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fclose(d->fpin); |
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gdFree(d); /* free associated memory */ |
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} |
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|
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|
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int4 |
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gdGetInt(ab, n) /* get an n-byte integer from buffer ab */ |
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register unsigned char *ab; |
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register int n; /* maximum length 4 */ |
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{ |
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register int4 res; |
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|
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res = *ab&0x80 ? -1 : 0; /* sign extend */ |
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while (n--) |
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res = res<<8 | *ab++; |
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return(res); |
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} |
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|
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|
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gdPutInt(ab, i, n) /* put an n-byte integer into buffer ab */ |
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register unsigned char *ab; |
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register int4 i; |
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register int n; |
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{ |
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while (n--) |
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*ab++ = i>>(n<<3) & 0xff; |
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} |
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|
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|
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double |
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gdGetReal(ab) /* get a 5-byte real value from buffer ab */ |
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char *ab; |
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{ |
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register int4 i; |
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register double d; |
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|
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i = gdGetInt(ab, 4); |
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d = (i + (i>0 ? .5 : -.5)) * (1./0x7fffffff); |
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return(ldexp(d, (int)gdGetInt(ab+4,1))); |
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} |
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|
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|
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gdPutReal(ab, d) /* put a 5-byte real value to buffer ab */ |
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unsigned char *ab; |
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double d; |
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{ |
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int e; |
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|
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gdPutInt(ab, (int4)(frexp(d,&e)*0x7fffffff), 4); |
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gdPutInt(ab+4, (int4)e, 1); |
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} |
