hush: do not exit interactive shell on some redirection errors

$ echo >&99
hush: dup2(99,1): Bad file descriptor
$ echo >&9999
hush: fcntl(1,F_DUPFD,10000): Invalid argument
$ echo 2>/dev/tty 10>&9999
hush: fcntl(10,F_DUPFD,10000): Invalid argument
$ still alive!_

function                                             old     new   delta
static.setup_redirects                               334     394     +60
.rodata                                           105661  105712     +51
dup_CLOEXEC                                           49      79     +30
save_fd_on_redirect                                  263     277     +14
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 4/0 up/down: 155/0)             Total: 155 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

5 files changed, 8 insertions, 5 deletions

diff --git a/shell/hush_test/hush-redir/redir3.right b/shell/hush_test/hush-redir/redir3.right
index e3c878b7d..d49237c42 100644
--- a/shell/hush_test/hush-redir/redir3.right
+++ b/shell/hush_test/hush-redir/redir3.right
@@ -1,2 +1,3 @@
 TEST
-hush: can't duplicate file descriptor: Bad file descriptor
+hush: dup2(9,1): Bad file descriptor
+Output to fd#9: 1
diff --git a/shell/hush_test/hush-redir/redir_exec2.tests b/shell/hush_test/hush-redir/redir_exec2.tests
index 700a51786..0af767592 100755
--- a/shell/hush_test/hush-redir/redir_exec2.tests
+++ b/shell/hush_test/hush-redir/redir_exec2.tests
@@ -8,4 +8,3 @@ ls -1 fd/3
 exec 5>&-
 test -e fd/5 && echo BUG
 echo One:$?
-
diff --git a/shell/hush_test/hush-redir/redir_to_bad_fd.right b/shell/hush_test/hush-redir/redir_to_bad_fd.right
index 936911ce5..4fc51cc93 100644
--- a/shell/hush_test/hush-redir/redir_to_bad_fd.right
+++ b/shell/hush_test/hush-redir/redir_to_bad_fd.right
@@ -1 +1,2 @@
-hush: can't duplicate file descriptor: Bad file descriptor
+hush: dup2(10,1): Bad file descriptor
+OK
diff --git a/shell/hush_test/hush-redir/redir_to_bad_fd255.right b/shell/hush_test/hush-redir/redir_to_bad_fd255.right
index 936911ce5..baa2959ca 100644
--- a/shell/hush_test/hush-redir/redir_to_bad_fd255.right
+++ b/shell/hush_test/hush-redir/redir_to_bad_fd255.right
@@ -1 +1,2 @@
-hush: can't duplicate file descriptor: Bad file descriptor
+hush: dup2(255,1): Bad file descriptor
+OK
diff --git a/shell/hush_test/hush-redir/redir_to_bad_fd3.right b/shell/hush_test/hush-redir/redir_to_bad_fd3.right
index 936911ce5..5e54abc0a 100644
--- a/shell/hush_test/hush-redir/redir_to_bad_fd3.right
+++ b/shell/hush_test/hush-redir/redir_to_bad_fd3.right
@@ -1 +1,2 @@
-hush: can't duplicate file descriptor: Bad file descriptor
+hush: fd#3 is not open
+OK