changes from erik quanstrom

src/cmd/ndb/runproc.c

@@ -0,0 +1,37 @@
+#include <u.h>
+#include <libc.h>
+#include <thread.h>
+#include <bio.h>
+#include <ndb.h>
+#include "dns.h"
+
+Waitmsg*
+runprocfd(char *file, char **v, int fd[3])
+{
+	int pid, i;
+
+	threadwaitchan();
+	pid = threadspawn(fd, file, v);
+	for(i=0; i<3; i++)
+		close(fd[i]);
+	if(pid < 0)
+		return nil;
+	return procwait(pid);
+}
+
+Waitmsg*
+runproc(char *file, char **v, int devnull)
+{
+	int fd[3], i;
+
+	if(devnull){
+		fd[0] = open("/dev/null", ORDWR);
+		fd[1] = dup(1, fd[0]);
+		fd[2] = dup(2, fd[0]);
+	}else{
+		for(i=0; i<3; i++)
+			fd[i] = dup(i, -1);
+	}
+	return runprocfd(file, v, fd);
+}
+