1 files changed, 50 insertions, 0 deletions
diff --git a/unit-tests/cmd-interrupt.mk b/unit-tests/cmd-interrupt.mk
new file mode 100755
index 000000000000..033f3307bd2e
--- /dev/null
+++ b/unit-tests/cmd-interrupt.mk
@@ -0,0 +1,50 @@
+# $NetBSD: cmd-interrupt.mk,v 1.2 2020/08/28 18:16:22 rillig Exp $
+#
+# Tests for interrupting a command.
+#
+# If a command is interrupted (usually by the user, here by itself), the
+# target is removed.  This is to avoid having an unfinished target that
+# would be newer than all of its sources and would therefore not be
+# tried again in the next run.
+#
+# This happens for ordinary targets as well as for .PHONY targets, even
+# though the .PHONY targets usually do not correspond to a file.
+#
+# To protect the target from being removed, the target has to be marked with
+# the special source .PRECIOUS.  These targets need to ensure for themselves
+# that interrupting them does not leave an inconsistent state behind.
+#
+# See also:
+#	CompatDeleteTarget
+
+all: clean-before interrupt-ordinary interrupt-phony interrupt-precious clean-after
+
+clean-before clean-after: .PHONY
+	@rm -f cmd-interrupt-ordinary cmd-interrupt-phony cmd-interrupt-precious
+
+interrupt-ordinary: .PHONY
+	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-ordinary || true
+	# The ././ is necessary to work around the file cache.
+	@echo ${.TARGET}: ${exists(././cmd-interrupt-ordinary) :? error : ok }
+
+interrupt-phony: .PHONY
+	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-phony || true
+	# The ././ is necessary to work around the file cache.
+	@echo ${.TARGET}: ${exists(././cmd-interrupt-phony) :? error : ok }
+
+interrupt-precious: .PRECIOUS
+	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-precious || true
+	# The ././ is necessary to work around the file cache.
+	@echo ${.TARGET}: ${exists(././cmd-interrupt-precious) :? ok : error }
+
+cmd-interrupt-ordinary:
+	> ${.TARGET}
+	@kill -INT ${.MAKE.PID}
+
+cmd-interrupt-phony: .PHONY
+	> ${.TARGET}
+	@kill -INT ${.MAKE.PID}
+
+cmd-interrupt-precious: .PRECIOUS
+	> ${.TARGET}
+	@kill -INT ${.MAKE.PID}