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job-output-null.mk revision 1.4 
      1 # $NetBSD: job-output-null.mk,v 1.4 2022/09/03 08:03:27 rillig Exp $
      2 #
      3 # Test how null bytes in the output of a command are handled.  Make processes
      4 # them using null-terminated strings, which may cut off some of the output.
      5 #
      6 # Before job.c 1.454 from 2022-09-03, make handled null bytes in the output
      7 # from the child process inconsistently.  It's an edge case though since
      8 # typically the child processes output text.
      9 
     10 # Note: The printf commands used in this test must only use a single format
     11 # string, without parameters.  This is because it is implementation-dependent
     12 # how many times the command 'printf "fmt%s" "" "" ""' calls write(2).
     13 #
     14 #	NetBSD /bin/sh		1 x write("fmtfmtfmt")
     15 #	Dash			1 x write("fmtfmtfmt")
     16 #	NetBSD /bin/ksh		3 x write("fmt") (via /bin/printf)
     17 #	Bash 5			3 x write("fmt")
     18 #
     19 # In the latter case the output may arrive in 1 to 3 parts, depending on the
     20 # exact timing, which in this test makes a crucial difference since before
     21 # job.c 1.454 from 2022-09-03, the outcome of the test depended on whether
     22 # there was a '\n' in each of the blocks from the output.  Depending on the
     23 # exact timing, the output of that test varied, its possible values were '2a',
     24 # '2a 2b', '2a 2c', '2a 2b 2c'.
     25 
     26 .MAKEFLAGS: -j1		# force jobs mode
     27 
     28 all: .PHONY
     29 	# The null byte from the command output is replaced with a single
     30 	# space by CollectOutput.
     31 	@printf '1\0trailing\n'
     32 	# expect: 1 trailing
     33 
     34 	# Give the parent process a chance to see the above output, but not
     35 	# yet the output from the next printf command.
     36 	@sleep 1
     37 
     38 	# Each null byte from the command output is replaced with a single
     39 	# space.
     40 	@printf '2a\0trailing\n''2b\0trailing\n''2c\0trailing\n'
     41 	# expect: 2a trailing
     42 	# expect: 2b trailing
     43 	# expect: 2c trailing
     44 
     45 	@sleep 1
     46 
     47 	# Each null byte from the command output is replaced with a single
     48 	# space.  Because there is no trailing newline in the output, these
     49 	# null bytes were replaced with spaces even before job.c 1.454 from
     50 	# 2022-09-03, unlike in the cases above.
     51 	#
     52 	# The three null bytes in a row test whether this output is
     53 	# compressed to a single space like in DebugFailedTarget.  It isn't.
     54 	@printf '3a\0without\0\0\0newline, 3b\0without\0\0\0newline.'
     55 	# expect: 3a without   newline, 3b without   newline.
     56