Initial revision

src/libdraw/keyboard.c

@@ -0,0 +1,102 @@
+#include <u.h>
+#include <libc.h>
+#include <draw.h>
+#include <thread.h>
+#include <keyboard.h>
+
+
+void
+closekeyboard(Keyboardctl *kc)
+{
+	if(kc == nil)
+		return;
+
+	postnote(PNPROC, kc->pid, "kill");
+
+#ifdef BUG
+	/* Drain the channel */
+	while(?kc->c)
+		<-kc->c;
+#endif
+
+	close(kc->ctlfd);
+	close(kc->consfd);
+	free(kc->file);
+	free(kc->c);
+	free(kc);
+}
+
+static
+void
+_ioproc(void *arg)
+{
+	int m, n;
+	char buf[20];
+	Rune r;
+	Keyboardctl *kc;
+
+	kc = arg;
+	threadsetname("kbdproc");
+	kc->pid = getpid();
+	n = 0;
+	for(;;){
+		while(n>0 && fullrune(buf, n)){
+			m = chartorune(&r, buf);
+			n -= m;
+			memmove(buf, buf+m, n);
+			send(kc->c, &r);
+		}
+		m = read(kc->consfd, buf+n, sizeof buf-n);
+		if(m <= 0){
+			yield();	/* if error is due to exiting, we'll exit here */
+			fprint(2, "keyboard read error: %r\n");
+			threadexits("error");
+		}
+		n += m;
+	}
+}
+
+Keyboardctl*
+initkeyboard(char *file)
+{
+	Keyboardctl *kc;
+	char *t;
+
+	kc = mallocz(sizeof(Keyboardctl), 1);
+	if(kc == nil)
+		return nil;
+	if(file == nil)
+		file = "/dev/cons";
+	kc->file = strdup(file);
+	kc->consfd = open(file, ORDWR|OCEXEC);
+	t = malloc(strlen(file)+16);
+	if(kc->consfd<0 || t==nil){
+Error1:
+		free(kc);
+		return nil;
+	}
+	sprint(t, "%sctl", file);
+	kc->ctlfd = open(t, OWRITE|OCEXEC);
+	if(kc->ctlfd < 0){
+		fprint(2, "initkeyboard: can't open %s: %r\n", t);
+Error2:
+		close(kc->consfd);
+		free(t);
+		goto Error1;
+	}
+	if(ctlkeyboard(kc, "rawon") < 0){
+		fprint(2, "initkeyboard: can't turn on raw mode on %s: %r\n", t);
+		close(kc->ctlfd);
+		goto Error2;
+	}
+	free(t);
+	kc->c = chancreate(sizeof(Rune), 20);
+	proccreate(_ioproc, kc, 4096);
+	return kc;
+}
+
+int
+ctlkeyboard(Keyboardctl *kc, char *m)
+{
+	return write(kc->ctlfd, m, strlen(m));
+}