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https://github.com/LadybirdBrowser/ladybird
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884a0140aa
Previously, `AnonymousBuffer::create_with_size(0)` returned an error because POSIX `mmap` rejects a zero length with `EINVAL`, and Windows `CreateFileMapping` rejects a zero maximum size for an anonymous mapping. This caused a crash when using `--headless=text` with zero size pages like `about:blank`.
75 lines
2.2 KiB
C++
75 lines
2.2 KiB
C++
/*
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* Copyright (c) 2026, Tim Ledbetter <tim.ledbetter@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/ByteBuffer.h>
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#include <LibCore/AnonymousBuffer.h>
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#include <LibCore/System.h>
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#include <LibTest/TestCase.h>
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#include <string.h>
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TEST_CASE(create_with_size)
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{
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auto buffer = MUST(Core::AnonymousBuffer::create_with_size(1024));
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EXPECT(buffer.is_valid());
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EXPECT_NE(buffer.fd(), -1);
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EXPECT_EQ(buffer.size(), 1024u);
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EXPECT_NE(buffer.data<void>(), nullptr);
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EXPECT_EQ(buffer.bytes().size(), 1024u);
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}
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TEST_CASE(default_constructed_is_invalid)
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{
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Core::AnonymousBuffer buffer;
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EXPECT(!buffer.is_valid());
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EXPECT_EQ(buffer.fd(), -1);
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EXPECT_EQ(buffer.size(), 0u);
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EXPECT_EQ(buffer.data<void>(), nullptr);
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EXPECT(buffer.bytes().is_empty());
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}
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TEST_CASE(read_and_write_contents)
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{
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auto buffer = MUST(Core::AnonymousBuffer::create_with_size(64));
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auto const payload = "hello, anonymous buffer!"sv;
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memcpy(buffer.data<void>(), payload.characters_without_null_termination(), payload.length());
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auto const* data = buffer.data<char const>();
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StringView read_back { data, payload.length() };
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EXPECT_EQ(read_back, payload);
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}
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TEST_CASE(create_with_zero_size)
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{
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auto buffer = MUST(Core::AnonymousBuffer::create_with_size(0));
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EXPECT(buffer.is_valid());
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EXPECT_EQ(buffer.size(), 0u);
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EXPECT(buffer.bytes().is_empty());
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auto fd = MUST(Core::System::dup(buffer.fd()));
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auto mirror = MUST(Core::AnonymousBuffer::create_from_anon_fd(fd, 0));
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EXPECT(mirror.is_valid());
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EXPECT_EQ(mirror.size(), 0u);
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EXPECT(mirror.bytes().is_empty());
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}
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TEST_CASE(reconstruct_from_anon_fd_shares_memory)
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{
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auto original = MUST(Core::AnonymousBuffer::create_with_size(128));
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auto const payload = "shared across mappings"sv;
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memcpy(original.data<void>(), payload.characters_without_null_termination(), payload.length());
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auto fd = MUST(Core::System::dup(original.fd()));
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auto mirror = MUST(Core::AnonymousBuffer::create_from_anon_fd(fd, original.size()));
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EXPECT(mirror.is_valid());
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EXPECT_EQ(mirror.size(), original.size());
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StringView mirrored { mirror.data<char const>(), payload.length() };
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EXPECT_EQ(mirrored, payload);
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}
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