1# $NetBSD: varname-dot-make-ppid.mk,v 1.3 2022/01/23 21:48:59 rillig Exp $ 2# 3# Tests for the special .MAKE.PPID variable, which contains the process ID of 4# make's parent process. 5 6# The parent process ID must be a positive integer. 7.if ${.MAKE.PPID:C,[0-9],,g} != "" 8. error 9.elif !(${.MAKE.PPID} > 0) 10. error 11.endif 12 13# Ensure that the process exists. 14_!= kill -0 ${.MAKE.PPID} 15 16# The parent process ID must be different from the process ID. If they were 17# the same, make would run as process 1, which is not a good idea because make 18# is not prepared to clean up after other processes. 19.if ${.MAKE.PPID} == ${.MAKE.PID} 20. error 21.endif 22 23all: .PHONY 24