24 lines
654 B
Makefile
24 lines
654 B
Makefile
# $NetBSD: varname-dot-make-ppid.mk,v 1.3 2022/01/23 21:48:59 rillig Exp $
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#
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# Tests for the special .MAKE.PPID variable, which contains the process ID of
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# make's parent process.
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# The parent process ID must be a positive integer.
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.if ${.MAKE.PPID:C,[0-9],,g} != ""
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. error
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.elif !(${.MAKE.PPID} > 0)
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. error
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.endif
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# Ensure that the process exists.
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_!= kill -0 ${.MAKE.PPID}
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# The parent process ID must be different from the process ID. If they were
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# the same, make would run as process 1, which is not a good idea because make
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# is not prepared to clean up after other processes.
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.if ${.MAKE.PPID} == ${.MAKE.PID}
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. error
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.endif
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all: .PHONY
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