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Diffstat (limited to 'shell/hush.c')
-rw-r--r--shell/hush.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/shell/hush.c b/shell/hush.c
index 184d720..b64993f 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -894,8 +894,9 @@ struct globals {
# define G_flag_return_in_progress 0
#endif
smallint exiting; /* used to prevent EXIT trap recursion */
- /* These four support $?, $#, and $1 */
+ /* These support $?, $#, and $1 */
smalluint last_exitcode;
+ smalluint expand_exitcode;
smalluint last_bg_pid_exitcode;
#if ENABLE_HUSH_SET
/* are global_argv and global_argv[1..n] malloced? (note: not [0]) */
@@ -6209,6 +6210,7 @@ static NOINLINE int expand_vars_to_list(o_string *output, int n, char *arg)
* and $IFS-split */
debug_printf_subst("SUBST '%s' first_ch %x\n", arg, first_ch);
G.last_exitcode = process_command_subs(&subst_result, arg);
+ G.expand_exitcode = G.last_exitcode;
debug_printf_subst("SUBST RES:%d '%s'\n", G.last_exitcode, subst_result.data);
val = subst_result.data;
goto store_val;
@@ -8245,9 +8247,11 @@ static NOINLINE int run_pipe(struct pipe *pi)
#endif
if (argv[command->assignment_cnt] == NULL) {
- /* Assignments, but no command */
- /* Ensure redirects take effect (that is, create files).
- * Try "a=t >file" */
+ /* Assignments, but no command.
+ * Ensure redirects take effect (that is, create files).
+ * Try "a=t >file"
+ */
+ G.expand_exitcode = 0;
#if 0 /* A few cases in testsuite fail with this code. FIXME */
rcode = redirect_and_varexp_helper(&new_env, /*old_vars:*/ NULL, command, &squirrel, /*argv_expanded:*/ NULL);
/* Set shell variables */
@@ -8265,7 +8269,7 @@ static NOINLINE int run_pipe(struct pipe *pi)
* if evaluating assignment value set $?, retain it.
* Try "false; q=`exit 2`; echo $?" - should print 2: */
if (rcode == 0)
- rcode = G.last_exitcode;
+ rcode = G.expand_exitcode;
/* Exit, _skipping_ variable restoring code: */
goto clean_up_and_ret0;
@@ -8292,9 +8296,13 @@ static NOINLINE int run_pipe(struct pipe *pi)
bb_putchar_stderr('\n');
/* Redirect error sets $? to 1. Otherwise,
* if evaluating assignment value set $?, retain it.
- * Try "false; q=`exit 2`; echo $?" - should print 2: */
+ * Else, clear $?:
+ * false; q=`exit 2`; echo $? - should print 2
+ * false; x=1; echo $? - should print 0
+ * Because of the 2nd case, we can't just use G.last_exitcode.
+ */
if (rcode == 0)
- rcode = G.last_exitcode;
+ rcode = G.expand_exitcode;
IF_HAS_KEYWORDS(if (pi->pi_inverted) rcode = !rcode;)
debug_leave();
debug_printf_exec("run_pipe: return %d\n", rcode);