diff --git a/src/sudo.c b/src/sudo.c
index 3700a79ee3..49f5bd2337 100644
--- a/src/sudo.c
+++ b/src/sudo.c
@@ -622,10 +622,13 @@ get_user_info(struct user_details *ud)
     if (ttydev != (dev_t)-1) {
 	if (asprintf(&info[++i], "ttydev=%lld", (long long)ttydev) == -1)
 	    goto oom;
-	info[++i] = sudo_new_key_val("tty", path);
-	if (info[i] == NULL)
-	    goto oom;
-	ud->tty = info[i] + sizeof("tty=") - 1;
+	/* The terminal device file may be missing in a chroot() jail. */
+	if (path[0] != '\0') {
+	    info[++i] = sudo_new_key_val("tty", path);
+	    if (info[i] == NULL)
+		goto oom;
+	    ud->tty = info[i] + sizeof("tty=") - 1;
+	}
     } else {
 	/* tty may not always be present */
 	if (errno != ENOENT)
diff --git a/src/ttyname.c b/src/ttyname.c
index a36b6da2fa..ec3160d4b8 100644
--- a/src/ttyname.c
+++ b/src/ttyname.c
@@ -94,8 +94,10 @@
 
 #if defined(sudo_kp_tdev)
 /*
- * Store the name of the tty to which the process is attached in name.
- * Returns name on success and NULL on failure, setting errno.
+ * Look up terminal device that the process is attached to and
+ * fill in its name, if available.  Sets name to the empty string
+ * if the device number cannot be mapped to a device name.
+ * Returns the tty device number on success and -1 on failure, setting errno.
  */
 dev_t
 get_process_ttyname(char *name, size_t namelen)
@@ -135,10 +137,11 @@ get_process_ttyname(char *name, size_t namelen)
 	    errno = serrno;
 	    ttydev = (dev_t)ki_proc->sudo_kp_tdev;
 	    if (sudo_ttyname_dev(ttydev, name, namelen) == NULL) {
-		sudo_warnx(
-		    U_("unable to find terminal name for device %u, %u"),
+		sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+		    "unable to find terminal name for device %u, %u",
 		    (unsigned int)major(ttydev), (unsigned int)minor(ttydev));
-		ttydev = (dev_t)-1;
+		if (namelen != 0)
+		    *name = '\0';
 	    }
 	}
     } else {
@@ -151,8 +154,10 @@ get_process_ttyname(char *name, size_t namelen)
 }
 #elif defined(HAVE_STRUCT_PSINFO_PR_TTYDEV)
 /*
- * Store the name of the tty to which the process is attached in name.
- * Returns name on success and NULL on failure, setting errno.
+ * Look up terminal device that the process is attached to and
+ * fill in its name, if available.  Sets name to the empty string
+ * if the device number cannot be mapped to a device name.
+ * Returns the tty device number on success and -1 on failure, setting errno.
  */
 dev_t
 get_process_ttyname(char *name, size_t namelen)
@@ -179,10 +184,11 @@ get_process_ttyname(char *name, size_t namelen)
 	    if (ttydev != 0 && ttydev != (dev_t)-1) {
 		errno = serrno;
 		if (sudo_ttyname_dev(ttydev, name, namelen) == NULL) {
-		    sudo_warnx(
-			U_("unable to find terminal name for device %u, %u"),
+		    sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+			"unable to find terminal name for device %u, %u",
 			(unsigned int)major(ttydev), (unsigned int)minor(ttydev));
-		    ttydev = (dev_t)-1;
+		    if (namelen != 0)
+			*name = '\0';
 		}
 		goto done;
 	    }
@@ -197,10 +203,11 @@ get_process_ttyname(char *name, size_t namelen)
 	    if (sudo_isatty(i, &sb)) {
 		ttydev = sb.st_rdev;
 		if (sudo_ttyname_dev(ttydev, name, namelen) == NULL) {
-		    sudo_warnx(
-			U_("unable to find terminal name for device %u, %u"),
+		    sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+			"unable to find terminal name for device %u, %u",
 			(unsigned int)major(ttydev), (unsigned int)minor(ttydev));
-		    ttydev = (dev_t)-1;
+		    if (namelen != 0)
+			*name = '\0';
 		}
 		goto done;
 	    }
@@ -217,8 +224,10 @@ get_process_ttyname(char *name, size_t namelen)
 }
 #elif defined(__linux__)
 /*
- * Store the name of the tty to which the process is attached in name.
- * Returns name on success and NULL on failure, setting errno.
+ * Look up terminal device that the process is attached to and
+ * fill in its name, if available.  Sets name to the empty string
+ * if the device number cannot be mapped to a device name.
+ * Returns the tty device number on success and -1 on failure, setting errno.
  */
 dev_t
 get_process_ttyname(char *name, size_t namelen)
@@ -282,10 +291,11 @@ get_process_ttyname(char *name, size_t namelen)
 				ttydev = (unsigned int)tty_nr;
 				errno = serrno;
 				if (sudo_ttyname_dev(ttydev, name, namelen) == NULL) {
-				    sudo_warnx(
-					U_("unable to find terminal name for device %u, %u"),
+				    sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+					"unable to find terminal name for device %u, %u",
 					(unsigned int)major(ttydev), (unsigned int)minor(ttydev));
-				    ttydev = (dev_t)-1;
+				    if (namelen != 0)
+					*name = '\0';
 				}
 				goto done;
 			    }
@@ -310,10 +320,11 @@ get_process_ttyname(char *name, size_t namelen)
 	    if (sudo_isatty(i, &sb)) {
 		ttydev = sb.st_rdev;
 		if (sudo_ttyname_dev(sb.st_rdev, name, namelen) == NULL) {
-		    sudo_warnx(
-			U_("unable to find terminal name for device %u, %u"),
+		    sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+			"unable to find terminal name for device %u, %u",
 			(unsigned int)major(ttydev), (unsigned int)minor(ttydev));
-		    ttydev = (dev_t)-1;
+		    if (namelen != 0)
+			*name = '\0';
 		}
 		goto done;
 	    }
@@ -332,8 +343,10 @@ get_process_ttyname(char *name, size_t namelen)
 }
 #elif defined(HAVE_PSTAT_GETPROC)
 /*
- * Store the name of the tty to which the process is attached in name.
- * Returns name on success and NULL on failure, setting errno.
+ * Look up terminal device that the process is attached to and
+ * fill in its name, if available.  Sets name to the empty string
+ * if the device number cannot be mapped to a device name.
+ * Returns the tty device number on success and -1 on failure, setting errno.
  */
 dev_t
 get_process_ttyname(char *name, size_t namelen)
@@ -354,11 +367,12 @@ get_process_ttyname(char *name, size_t namelen)
 	    errno = serrno;
 	    ttydev = makedev(pst.pst_term.psd_major, pst.pst_term.psd_minor);
 	    if (sudo_ttyname_dev(ttydev, name, namelen) == NULL) {
-		sudo_warnx(
-		    U_("unable to find terminal name for device %u, %u"),
+		sudo_debug_printf(SUDO_DEBUG_WARN|SUDO_DEBUG_LINENO,
+		    "unable to find terminal name for device %u, %u",
 		    (unsigned int)pst.pst_term.psd_major,
 		    (unsigned int)pst.pst_term.psd_minor);
-		ttydev = (dev_t)-1;
+		if (namelen != 0)
+		    *name = '\0';
 	    }
 	    goto done;
 	}
@@ -373,8 +387,8 @@ get_process_ttyname(char *name, size_t namelen)
 }
 #else
 /*
- * Store the name of the tty to which the process is attached in name.
- * Returns name on success and NULL on failure, setting errno.
+ * Look up terminal device that the process is attached to and fill in name.
+ * Returns the tty device number on success and -1 on failure, setting errno.
  */
 dev_t
 get_process_ttyname(char *name, size_t namelen)