38094: Fix POSIX EXIT traps defined in function.

These aren't local, so set the local level to 0; else they can get
overridden incorrectly.

ChangeLog

@@ -1,3 +1,9 @@
+2016-03-07  Peter Stephenson  <p.stephenson@samsung.com>
+
+	* 38094: Src/signals.c, Test/C03traps.ztst: POSIX exit traps
+	aren't local so local level should be 0 so they don't
+	get trashed if defined in a function.
+
 2016-03-06  Barton E. Schaefer  <schaefer@zsh.org>
 
 	* 38106: Src/parse.c: if...then if...else should be a parse error.

Src/signals.c

@@ -877,16 +877,21 @@ settrap(int sig, Eprog l, int flags)
             sig != SIGCHLD)
             install_handler(sig);
     }
+    sigtrapped[sig] |= flags;
     /*
      * Note that introducing the locallevel does not affect whether
      * sigtrapped[sig] is zero or not, i.e. a test without a mask
      * works just the same.
      */
-    sigtrapped[sig] |= (locallevel << ZSIG_SHIFT) | flags;
     if (sig == SIGEXIT) {
 	/* Make POSIX behaviour of EXIT trap sticky */
 	exit_trap_posix = isset(POSIXTRAPS);
+	/* POSIX exit traps are not local. */
+	if (!exit_trap_posix)
+	    sigtrapped[sig] |= (locallevel << ZSIG_SHIFT);
     }
+    else
+	sigtrapped[sig] |= (locallevel << ZSIG_SHIFT);
     unqueue_signals();
     return 0;
 }

Test/C03traps.ztst

@@ -429,14 +429,32 @@
      fn
      echo exiting program
    ')
-0:POSX EXIT trap can have nested native mode EXIT trap
+0:POSIX EXIT trap can have nested native mode EXIT trap
 >entering program
 >entering native zsh function
 >native zsh function-local exit trap triggered
 >exiting program
 >POSIX exit trap triggered
 
-   (set -e
+   (cd ..; $ZTST_exe -fc '
+     echo entering program
+     emulate sh -c '\''spt() { trap "echo POSIX exit trap triggered" EXIT; }'\''
+     fn() {
+	trap "echo native zsh function-local exit trap triggered" EXIT
+	echo entering native zsh function
+     }
+     spt
+     fn
+     echo exiting program
+   ')
+0:POSIX EXIT trap not replaced if defined within function
+>entering program
+>entering native zsh function
+>native zsh function-local exit trap triggered
+>exiting program
+>POSIX exit trap triggered
+
+    (set -e
     printf "a\nb\n" | while read line
     do
        [[ $line = a* ]] || continue