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 28all: .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