56 lines
2.2 KiB
Makefile
56 lines
2.2 KiB
Makefile
# $NetBSD: job-output-null.mk,v 1.4 2022/09/03 08:03:27 rillig Exp $
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#
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# Test how null bytes in the output of a command are handled. Make processes
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# them using null-terminated strings, which may cut off some of the output.
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#
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# Before job.c 1.454 from 2022-09-03, make handled null bytes in the output
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# from the child process inconsistently. It's an edge case though since
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# typically the child processes output text.
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# Note: The printf commands used in this test must only use a single format
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# string, without parameters. This is because it is implementation-dependent
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# how many times the command 'printf "fmt%s" "" "" ""' calls write(2).
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#
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# NetBSD /bin/sh 1 x write("fmtfmtfmt")
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# Dash 1 x write("fmtfmtfmt")
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# NetBSD /bin/ksh 3 x write("fmt") (via /bin/printf)
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# Bash 5 3 x write("fmt")
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#
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# In the latter case the output may arrive in 1 to 3 parts, depending on the
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# exact timing, which in this test makes a crucial difference since before
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# job.c 1.454 from 2022-09-03, the outcome of the test depended on whether
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# there was a '\n' in each of the blocks from the output. Depending on the
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# exact timing, the output of that test varied, its possible values were '2a',
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# '2a 2b', '2a 2c', '2a 2b 2c'.
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.MAKEFLAGS: -j1 # force jobs mode
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all: .PHONY
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# The null byte from the command output is replaced with a single
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# space by CollectOutput.
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@printf '1\0trailing\n'
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# expect: 1 trailing
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# Give the parent process a chance to see the above output, but not
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# yet the output from the next printf command.
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@sleep 1
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# Each null byte from the command output is replaced with a single
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# space.
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@printf '2a\0trailing\n''2b\0trailing\n''2c\0trailing\n'
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# expect: 2a trailing
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# expect: 2b trailing
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# expect: 2c trailing
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@sleep 1
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# Each null byte from the command output is replaced with a single
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# space. Because there is no trailing newline in the output, these
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# null bytes were replaced with spaces even before job.c 1.454 from
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# 2022-09-03, unlike in the cases above.
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#
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# The three null bytes in a row test whether this output is
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# compressed to a single space like in DebugFailedTarget. It isn't.
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@printf '3a\0without\0\0\0newline, 3b\0without\0\0\0newline.'
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# expect: 3a without newline, 3b without newline.
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