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cmd-interrupt.mk revision 1.5 
      1 # $NetBSD: cmd-interrupt.mk,v 1.5 2024/07/13 15:10:06 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
     21 all: interrupt-ordinary
     22 all: interrupt-phony
     23 all: interrupt-precious
     24 all: interrupt-compat
     25 all: clean-after
     26 
     27 clean-before clean-after: .PHONY
     28 	@rm -f cmd-interrupt-ordinary cmd-interrupt-phony
     29 	@rm -f cmd-interrupt-precious cmd-interrupt-compat
     30 
     31 interrupt-ordinary:
     32 	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-ordinary || true
     33 	# The ././ is necessary to work around the file cache.
     34 	@echo ${.TARGET}: ${exists(././cmd-interrupt-ordinary) :? error : ok }
     35 
     36 interrupt-phony: .PHONY
     37 	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-phony || true
     38 	# The ././ is necessary to work around the file cache.
     39 	@echo ${.TARGET}: ${exists(././cmd-interrupt-phony) :? ok : error }
     40 
     41 interrupt-precious: .PRECIOUS
     42 	@${.MAKE} ${MAKEFLAGS} -f ${MAKEFILE} cmd-interrupt-precious || true
     43 	# The ././ is necessary to work around the file cache.
     44 	@echo ${.TARGET}: ${exists(././cmd-interrupt-precious) :? ok : error }
     45 
     46 interrupt-compat:
     47 	@${MAKE} -f ${MAKEFILE} cmd-interrupt-compat || true
     48 	@echo ${.TARGET} ${exists(././cmd-interrupt-compat) :? expected-fail : unexpected-ok }
     49 
     50 cmd-interrupt-ordinary:
     51 	> ${.TARGET}
     52 	@kill -INT ${.MAKE.PID}
     53 
     54 cmd-interrupt-phony: .PHONY
     55 	> ${.TARGET}
     56 	@kill -INT ${.MAKE.PID}
     57 
     58 cmd-interrupt-precious: .PRECIOUS
     59 	> ${.TARGET}
     60 	@kill -INT ${.MAKE.PID}
     61 
     62 # When the make process (and not the process group) is interrupted in compat
     63 # mode, it first tries to interrupt the process group of the currently running
     64 # child command, but that fails since there is no such process group, rather
     65 # the child command runs in the same process group as make itself.  The child
     66 # command then continues, and after sleeping a bit creates the target file.
     67 cmd-interrupt-compat:
     68 	@kill -INT ${.MAKE.PID} && sleep 1 && > ${.TARGET}
     69