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-rw-r--r--bits/sigcontext.h4
1 files changed, 4 insertions, 0 deletions
diff --git a/bits/sigcontext.h b/bits/sigcontext.h
index 46e4df8..576fd30 100644
--- a/bits/sigcontext.h
+++ b/bits/sigcontext.h
@@ -17,6 +17,10 @@
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
+#ifndef _SIGNAL_H
+# error "Never use <bits/sigcontext.h> directly; include <signal.h> instead."
+#endif
+
/* State of this thread when the signal was taken. */
struct sigcontext
{