1 files changed, 81 insertions, 0 deletions
diff --git a/contrib/sendmail/include/sm/signal.h b/contrib/sendmail/include/sm/signal.h
new file mode 100644
index 0000000..3821deb
--- /dev/null
+++ b/contrib/sendmail/include/sm/signal.h
@@ -0,0 +1,81 @@
+/*
+ * Copyright (c) 1998-2001 Sendmail, Inc. and its suppliers.
+ *	All rights reserved.
+ * Copyright (c) 1983, 1995-1997 Eric P. Allman.  All rights reserved.
+ * Copyright (c) 1988, 1993
+ *	The Regents of the University of California.  All rights reserved.
+ *
+ * By using this file, you agree to the terms and conditions set
+ * forth in the LICENSE file which can be found at the top level of
+ * the sendmail distribution.
+ *
+ *	$Id: signal.h,v 1.16 2001/07/20 19:48:21 gshapiro Exp $
+ */
+
+/*
+**  SIGNAL.H -- libsm (and sendmail) signal facilities
+**		Extracted from sendmail/conf.h and focusing
+**		on signal configuration.
+*/
+
+#ifndef SM_SIGNAL_H
+#define SM_SIGNAL_H 1
+
+#include <sys/types.h>
+#include <limits.h>
+#include <signal.h>
+#include <sm/cdefs.h>
+#include <sm/conf.h>
+
+/*
+**  Critical signal sections
+*/
+
+#define PEND_SIGHUP	0x0001
+#define PEND_SIGINT	0x0002
+#define PEND_SIGTERM	0x0004
+#define PEND_SIGUSR1	0x0008
+
+#define ENTER_CRITICAL()	InCriticalSection++
+
+#define LEAVE_CRITICAL()						\
+do									\
+{									\
+	if (InCriticalSection > 0)					\
+		InCriticalSection--;					\
+} while (0)
+
+#define CHECK_CRITICAL(sig)						\
+do									\
+{									\
+	if (InCriticalSection > 0 && (sig) != 0)			\
+	{								\
+		pend_signal((sig));					\
+		return SIGFUNC_RETURN;					\
+	}								\
+} while (0)
+
+/* variables */
+extern unsigned int	volatile InCriticalSection;	/* >0 if in critical section */
+extern int		volatile PendingSignal;	/* pending signal to resend */
+
+/* functions */
+extern void		pend_signal __P((int));
+
+/* reset signal in case System V semantics */
+#ifdef SYS5SIGNALS
+# define FIX_SYSV_SIGNAL(sig, handler)					\
+{									\
+	if ((sig) != 0)							\
+		(void) sm_signal((sig), (handler));			\
+}
+#else /* SYS5SIGNALS */
+# define FIX_SYSV_SIGNAL(sig, handler)	{ /* EMPTY */ }
+#endif /* SYS5SIGNALS */
+
+extern void		sm_allsignals __P((bool));
+extern int		sm_blocksignal __P((int));
+extern int		sm_releasesignal __P((int));
+extern sigfunc_t	sm_signal __P((int, sigfunc_t));
+extern SIGFUNC_DECL	sm_signal_noop __P((int));
+#endif /* SM_SIGNAL_H */