1 files changed, 18 insertions, 4 deletions
diff --git a/jbwrap.h b/jbwrap.h
index 7d0358b..4b3ea86 100644
--- a/jbwrap.h
+++ b/jbwrap.h
@@ -1,9 +1,23 @@
 #include <setjmp.h>
 
-/* certain braindamaged environments don't define jmp_buf as an array, so... */
+/* If we have POSIX sigjmp_buf and friends, use them.  If we don't, just
+use a jmp_buf.  This probably fails on a traditional SysV machine, where
+jmp_bufs don't preserve signal masks.  I'm not worrying about this till
+someone reports it as a bug :-). */
+
+#if HAVE_SIGSETJMP
+#else
+#define sigjmp_buf jmp_buf
+#define sigsetjmp(x,y) setjmp(x)
+#define siglongjmp longjmp
+#endif /* HAVE_SIGSETJMP */
+
+
+/* Certain braindamaged environments don't define jmp_buf as an array,
+so wrap it in a structure.  Potentially, we could use configure to do
+this only where it needs to be done, but the effort is probably not
+worth it. */
 
 struct Jbwrap {
-	jmp_buf j;
+	sigjmp_buf j;
 };
-
-extern Jbwrap slowbuf; /* for getting out of interrupts while performing slow i/o on BSD */