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diff --git a/sys/etc/syspanic.x b/sys/etc/syspanic.x
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+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+# SYS_PANIC -- Unconditionally abort process execution. Called when an error
+# condition occurs so serious that process execution cannot continue reliably.
+
+procedure sys_panic (errcode, errmsg)
+
+int errcode # error code
+char errmsg[ARB] # error message
+
+begin
+ # Since process termination is imminent we may as well overwrite the
+ # error message string by packing it in place.
+
+ call strpak (errmsg, errmsg, ARB)
+ call zpanic (errcode, errmsg)
+end