Index: procps/pwdx.c
===================================================================
--- procps.orig/pwdx.c	2013-08-16 10:13:41.723121575 -0600
+++ procps/pwdx.c	2013-08-16 10:13:47.619192217 -0600
@@ -52,6 +52,7 @@
 
 	if (!strncmp("/proc/", input, 6))
 		skip = 6;
+	errno = 0;
 	pid = strtol(input + skip, &end, 10);
 
 	if (errno || input + skip == end || (end && *end))
