28 lines
1.1 KiB
Bash
Executable File
28 lines
1.1 KiB
Bash
Executable File
#!/bin/sh
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# Copyright (c) 2024 DTB <trinity@trinity.moe>
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# Copyright (c) 2024 Emma Tebibyte <emma@tebibyte.media>
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# SPDX-License-Identifier: FSFAP
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#
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# Copying and distribution of this file, with or without modification, are
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# permitted in any medium without royalty provided the copyright notice and this
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# notice are preserved. This file is offered as-is, without any warranty.
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. tests/bonsai/test_env
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! dj -h
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# This test is theoretically Linux-dependent; write(2) should return -1 on
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# error.
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# Right now dj(1) interprets the return value of write(2) as the amount of
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# bytes written. This can decrement the stored quantity of bytes written,
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# which is an int, so doesn't underflow but goes negative. dj(1) tries to
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# again to write(2) if an error occurs in which no bytes are written, so in
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# total two write(2)s are attempted and so the written byte quantity is -2.
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# This is a bug and will change, but for now is at least documented.
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dj -Hi /dev/zero -o /dev/full \
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| xargs -I out "$BIN/strcmp" '1+0 > 0+0; 1024 > -2' out
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# Read nothing from /dev/null, write nothing to /dev/null.
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dj -Hi /dev/null -o /dev/null \
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| xargs -I out "$BIN/strcmp" '0+0 > 0+0; 0 > 0' out
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