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cmd-interrupt.mk revision 1.3 
      1 # $NetBSD: cmd-interrupt.mk,v 1.3 2020/11/15 14:07:53 rillig Exp $
      2 #
      3 # Tests for interrupting a command.
      4 #
      5 # If a command is interrupted (usually by the user, here by itself), the
      6 # target is removed.  This is to avoid having an unfinished target that
      7 # would be newer than all of its sources and would therefore not be
      8 # tried again in the next run.
      9 #
     10 # This happens for ordinary targets as well as for .PHONY targets, even
     11 # though the .PHONY targets usually do not correspond to a file.
     12 #
     13 # To protect the target from being removed, the target has to be marked with
     14 # the special source .PRECIOUS.  These targets need to ensure for themselves
     15 # that interrupting them does not leave an inconsistent state behind.
     16 #
     17 # See also:
     18 #	CompatDeleteTarget
     19 
     20 all: clean-before interrupt-ordinary interrupt-phony interrupt-precious clean-after
     21 
     22 clean-before clean-after: .PHONY
     23 	@rm -f cmd-interrupt-ordinary cmd-interrupt-phony cmd-interrupt-precious
     24 
     25 interrupt-ordinary:
     26 	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-ordinary || true
     27 	# The ././ is necessary to work around the file cache.
     28 	@echo ${.TARGET}: ${exists(././cmd-interrupt-ordinary) :? error : ok }
     29 
     30 interrupt-phony: .PHONY
     31 	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-phony || true
     32 	# The ././ is necessary to work around the file cache.
     33 	@echo ${.TARGET}: ${exists(././cmd-interrupt-phony) :? error : ok }
     34 
     35 interrupt-precious: .PRECIOUS
     36 	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-precious || true
     37 	# The ././ is necessary to work around the file cache.
     38 	@echo ${.TARGET}: ${exists(././cmd-interrupt-precious) :? ok : error }
     39 
     40 cmd-interrupt-ordinary:
     41 	> ${.TARGET}
     42 	@kill -INT ${.MAKE.PID}
     43 
     44 cmd-interrupt-phony: .PHONY
     45 	> ${.TARGET}
     46 	@kill -INT ${.MAKE.PID}
     47 
     48 cmd-interrupt-precious: .PRECIOUS
     49 	> ${.TARGET}
     50 	@kill -INT ${.MAKE.PID}
     51