1 files changed, 4 insertions, 0 deletions

diff --git a/shell/ash.c b/shell/ash.c
index 8ef8c465c..2db3302c7 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -6528,6 +6528,10 @@ setjobctl(int on)
                 int ofd;
                 ofd = fd = open(_PATH_TTY, O_RDWR);
                 if (fd < 0) {
+        /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails.
+         * That sometimes helps to acquire controlling tty.
+         * Obviously, a workaround for bugs when someone
+         * failed to provide a controlling tty to bash! :) */
                         fd += 3;
                         while (!isatty(fd) && --fd >= 0)
                                 ;