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Only in bash-4.1: _patchlevel
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diff -rup bash-4.1.orig/trap.c bash-4.1/trap.c
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--- bash-4.1.orig/trap.c 2013-05-14 13:58:06.224000564 +0900
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+++ bash-4.1/trap.c 2013-06-26 16:59:42.968001502 +0900
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@@ -269,6 +269,9 @@ run_pending_traps ()
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if (catch_flag == 0) /* simple optimization */
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return;
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+ if (running_trap > 0)
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+ return; /* no recursive trap invocations */
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+
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catch_flag = 0;
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/* Preserve $? when running trap. */
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@@ -294,6 +297,8 @@ run_pending_traps ()
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# endif
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#endif /* HAVE_POSIX_SIGNALS */
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+ running_trap = sig + 1;
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+
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if (sig == SIGINT)
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{
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run_interrupt_trap ();
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@@ -338,7 +343,14 @@ run_pending_traps ()
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save_subst_varlist = subst_assign_varlist;
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subst_assign_varlist = 0;
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+#if defined (JOB_CONTROL)
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+ save_pipeline (1); /* XXX only provides one save level */
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+#endif
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parse_and_execute (savestring (trap_list[sig]), "trap", SEVAL_NONINT|SEVAL_NOHIST|SEVAL_RESETLINE);
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+#if defined (JOB_CONTROL)
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+ restore_pipeline (1);
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+#endif
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+
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restore_token_state (token_state);
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free (token_state);
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@@ -346,6 +358,7 @@ run_pending_traps ()
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}
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pending_traps[sig] = 0;
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+ running_trap = 0;
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#if defined (HAVE_POSIX_SIGNALS)
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sigprocmask (SIG_SETMASK, &oset, (sigset_t *)NULL);
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