sh: Do not run callers' exception handlers in subshells.

Reset the exception handler in the child to main's.

This avoids inappropriate double cleanups or shell duplication when the
exception is caught, such as 'fc' and future 'command eval' and 'command .'.

1 files changed, 1 insertions, 0 deletions

diff --git a/bin/sh/jobs.c b/bin/sh/jobs.c
index 1ebf722..95ec6e2 100644
--- a/bin/sh/jobs.c
+++ b/bin/sh/jobs.c
@@ -757,6 +757,7 @@ forkshell(struct job *jp, union node *n, int mode)
 		TRACE(("Child shell %d\n", (int)getpid()));
 		wasroot = rootshell;
 		rootshell = 0;
+		handler = &main_handler;
 		closescript();
 		INTON;
 		clear_traps();