Do not exit on SIGINT in non-interactive shells, fixes PR 1206,

i.e. this makes emacs usable from system(3). Programs called from
shellscripts are now required to exit with proper signal status. That
means, they have to kill themself. Exiting with faked numerical exit
code is not sufficient.

Exit with proper signal status if script exits on signal.

Make the wait builtin interruptable, both with and without traps set.

Use volatile sig_atomic_t where (and only where) appropriate.

(Almost) fix printing of newlines on SIGINT.

Make traps setable from trap handlers. This is needed for shellscripts
that catch SIGINT for cleanup work but intend to exit on it, hance
have to kill themself from a trap handler. I.e. mkdep.

While I'm at it, make it -Wall clean. -Wall is not enabled in
Makefile, since vararg warnx() macro calls in usr.bin/printf/printf.c
are not -Wall-able.
PR:		1206
Obtained from:	Basic SIGINT fix from Bruce Evans

1 files changed, 6 insertions, 3 deletions

diff --git a/bin/sh/arith.y b/bin/sh/arith.y
index 49ca474..87f2f45 100644
--- a/bin/sh/arith.y
+++ b/bin/sh/arith.y
@@ -88,12 +88,12 @@ expr:	ARITH_LPAREN expr ARITH_RPAREN = { $$ = $2; }
  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  * SUCH DAMAGE.
  *
- *	$Id: arith.y,v 1.6 1997/02/22 13:58:21 peter Exp $
+ *	$Id: arith.y,v 1.7 1998/05/18 06:43:27 charnier Exp $
  */
 
-#ifndef lint
+#if 0
 static char sccsid[] = "@(#)arith.y	8.3 (Berkeley) 5/4/95";
-#endif /* not lint */
+#endif
 
 #include "shell.h"
 #include "error.h"
@@ -103,6 +103,9 @@ static char sccsid[] = "@(#)arith.y	8.3 (Berkeley) 5/4/95";
 char *arith_buf, *arith_startbuf;
 extern void arith_lex_reset();
 
+int yyparse(void);
+int yylex(void);
+
 int
 arith(s)
 	char *s;