mirror of
https://github.com/RGBCube/serenity
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d8b514873f
Using the kernel stack is preferable, especially when the examined strings should be limited to a reasonable length. This is a small improvement, because if we don't actually move these strings then we don't need to own heap allocations for them during the syscall handler function scope. In addition to that, some kernel strings are known to be limited, like the hostname string, for these strings we also can use FixedStringBuffer to store and copy to and from these buffers, without using any heap allocations at all.
51 lines
1.7 KiB
C++
51 lines
1.7 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022, kleines Filmröllchen <filmroellchen@serenityos.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/TypedTransfer.h>
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#include <Kernel/Tasks/Process.h>
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#include <Kernel/Version.h>
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namespace Kernel {
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#if ARCH(X86_64)
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# define UNAME_MACHINE "x86_64"
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#elif ARCH(AARCH64)
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# define UNAME_MACHINE "AArch64"
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#else
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# error Unknown architecture
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#endif
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ErrorOr<FlatPtr> Process::sys$uname(Userspace<utsname*> user_buf)
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{
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VERIFY_NO_PROCESS_BIG_LOCK(this);
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TRY(require_promise(Pledge::stdio));
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utsname buf {
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"SerenityOS",
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{}, // Hostname, filled in below.
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{}, // "Release" (1.0-dev), filled in below.
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{}, // "Revision" (git commit hash), filled in below.
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UNAME_MACHINE
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};
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auto version_string = TRY(KString::formatted("{}.{}-dev", SERENITY_MAJOR_REVISION, SERENITY_MINOR_REVISION));
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AK::TypedTransfer<u8>::copy(reinterpret_cast<u8*>(buf.release), version_string->bytes().data(), min(version_string->length(), UTSNAME_ENTRY_LEN - 1));
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AK::TypedTransfer<u8>::copy(reinterpret_cast<u8*>(buf.version), SERENITY_VERSION.bytes().data(), min(SERENITY_VERSION.length(), UTSNAME_ENTRY_LEN - 1));
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hostname().with_shared([&](auto const& name) {
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auto name_length = name.representable_view().length();
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VERIFY(name_length <= (UTSNAME_ENTRY_LEN - 1));
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AK::TypedTransfer<char>::copy(reinterpret_cast<char*>(buf.nodename), name.representable_view().characters_without_null_termination(), name_length);
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buf.nodename[name_length] = '\0';
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});
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TRY(copy_to_user(user_buf, &buf));
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return 0;
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}
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}
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