Dhog's 9term.

Updated for current libraries by Caerwyn Jones.
Button-3 plumbing (like in acme) by rsc.

src/cmd/9term/Linux.c

@@ -0,0 +1,22 @@
+#include "9term.h"
+
+void
+pdx(int pid, char *wdir, int bufn)
+{
+	char path[256];
+	int n;
+
+	snprint(path, sizeof path, "/proc/%d/cwd", pid);
+	n = readlink(path, wdir, bufn);
+	if(n < 0)
+		n = 0;
+	wdir[n] = '\0';
+}
+
+int
+getpts(int fd[], char *slave)
+{
+
+	openpty(&fd[1], &fd[0], slave, 0, 0);
+	return 0;
+}