From dbf57689c45611b8da9e269c24e409ee33a877d5 Mon Sep 17 00:00:00 2001
From: Russ Cox <rsc@swtch.com>
Date: Sat, 11 Jan 2020 05:52:59 -0500
Subject: libdraw: connect to devdraw via $wsysid when set

---
 src/libdraw/drawclient.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++-
 src/libdraw/drawfcall.c  | 16 ++++++++++++
 2 files changed, 79 insertions(+), 1 deletion(-)

(limited to 'src/libdraw')

diff --git a/src/libdraw/drawclient.c b/src/libdraw/drawclient.c
index ef0356b8..9376f9c0 100644
--- a/src/libdraw/drawclient.c
+++ b/src/libdraw/drawclient.c
@@ -22,11 +22,69 @@ static int canreadfd(int);
 int
 _displayconnect(Display *d)
 {
-	int pid, p[2];
+	int pid, p[2], fd, nbuf, n;
+	char *wsysid, *addr, *id;
+	uchar *buf;
+	Wsysmsg w;
 
 	fmtinstall('W', drawfcallfmt);
 	fmtinstall('H', encodefmt);
 
+	wsysid = getenv("wsysid");
+	if(wsysid != nil) {
+		// Connect to running devdraw service.
+		// wsysid=devdrawname/id
+		id = strchr(wsysid, '/');
+		if(id == nil) {
+			werrstr("invalid $wsysid");
+			return -1;
+		}
+		*id++ = '\0';
+		addr = smprint("unix!%s/%s", getns(), wsysid);
+		if(addr == nil)
+			return -1;
+		fd = dial(addr, 0, 0, 0);
+		free(addr);
+		if(fd < 0)
+			return -1;
+		nbuf = strlen(id) + 500;
+		buf = malloc(nbuf);
+		if(buf == nil) {
+			close(fd);
+			return -1;
+		}
+		memset(&w, 0, sizeof w);
+		w.type = Tctxt;
+		w.id = id;
+		n = convW2M(&w, buf, nbuf);
+		if(write(fd, buf, n) != n) {
+			close(fd);
+			werrstr("wsys short write: %r");
+			return -1;
+		}
+		n = readwsysmsg(fd, buf, nbuf);
+		if(n < 0) {
+			close(fd);
+			werrstr("wsys short read: %r");
+			return -1;
+		}
+		if(convM2W(buf, n, &w) <= 0) {
+			close(fd);
+			werrstr("wsys decode error");
+			return -1;
+		}
+		if(w.type != Rctxt) {
+			close(fd);
+			if(w.type == Rerror)
+				werrstr("%s", w.error);
+			else
+				werrstr("wsys rpc phase error (%d)", w.type);
+			return -1;
+		}
+		d->srvfd = fd;
+		return 0;
+	}
+
 	if(pipe(p) < 0)
 		return -1;
 	if((pid=fork()) < 0){
@@ -36,6 +94,10 @@ _displayconnect(Display *d)
 	}
 	if(pid == 0){
 		char *devdraw;
+
+		devdraw = getenv("DEVDRAW");
+		if(devdraw == nil)
+			devdraw = "devdraw";
 		close(p[0]);
 		dup(p[1], 0);
 		dup(p[1], 1);
diff --git a/src/libdraw/drawfcall.c b/src/libdraw/drawfcall.c
index c74b3faf..eea14095 100644
--- a/src/libdraw/drawfcall.c
+++ b/src/libdraw/drawfcall.c
@@ -51,6 +51,7 @@ sizeW2M(Wsysmsg *m)
 	case Rcursor2:
 	case Trdkbd:
 	case Rlabel:
+	case Rctxt:
 	case Rinit:
 	case Trdsnarf:
 	case Rwrsnarf:
@@ -74,6 +75,9 @@ sizeW2M(Wsysmsg *m)
 		return 4+1+1+2;
 	case Tlabel:
 		return 4+1+1+_stringsize(m->label);
+	case Tctxt:
+		return 4+1+1
+			+_stringsize(m->id);
 	case Tinit:
 		return 4+1+1
 			+_stringsize(m->winsize)
@@ -114,6 +118,7 @@ convW2M(Wsysmsg *m, uchar *p, uint n)
 	case Rcursor2:
 	case Trdkbd:
 	case Rlabel:
+	case Rctxt:
 	case Rinit:
 	case Trdsnarf:
 	case Rwrsnarf:
@@ -164,6 +169,9 @@ convW2M(Wsysmsg *m, uchar *p, uint n)
 	case Tlabel:
 		PUTSTRING(p+6, m->label);
 		break;
+	case Tctxt:
+		PUTSTRING(p+6, m->id);
+		break;
 	case Tinit:
 		p += 6;
 		p += PUTSTRING(p, m->winsize);
@@ -214,6 +222,7 @@ convM2W(uchar *p, uint n, Wsysmsg *m)
 	case Rcursor2:
 	case Trdkbd:
 	case Rlabel:
+	case Rctxt:
 	case Rinit:
 	case Trdsnarf:
 	case Rwrsnarf:
@@ -264,6 +273,9 @@ convM2W(uchar *p, uint n, Wsysmsg *m)
 	case Tlabel:
 		GETSTRING(p+6, &m->label);
 		break;
+	case Tctxt:
+		GETSTRING(p+6, &m->id);
+		break;
 	case Tinit:
 		p += 6;
 		p += GETSTRING(p, &m->winsize);
@@ -352,6 +364,10 @@ drawfcallfmt(Fmt *fmt)
 		return fmtprint(fmt, "Tlabel label='%s'", m->label);
 	case Rlabel:
 		return fmtprint(fmt, "Rlabel");
+	case Tctxt:
+		return fmtprint(fmt, "Tctxt id='%s'", m->id);
+	case Rctxt:
+		return fmtprint(fmt, "Rctxt");
 	case Tinit:
 		return fmtprint(fmt, "Tinit label='%s' winsize='%s'", m->label, m->winsize);
 	case Rinit:
-- 
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