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https://github.com/RGBCube/serenity
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5dcc58d54a
Before this patch, Core::SessionManagement::parse_path_with_sid() would figure out the root session ID by sifting through /sys/kernel/processes. That file can take quite a while to generate (sometimes up to 40ms on my machine, which is a problem on its own!) and with no caching, many of our programs were effectively doing this multiple times on startup when unveiling something in /tmp/session/%sid/ While we should find ways to make generating /sys/kernel/processes fast again, this patch addresses the specific problem by introducing a new syscall: sys$get_root_session_id(). This extracts the root session ID by looking directly at the process table and takes <1ms instead of 40ms. This cuts WebContent process startup time by ~100ms on my machine. :^)
55 lines
1.5 KiB
C++
55 lines
1.5 KiB
C++
/*
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* Copyright (c) 2022, Peter Elliott <pelliott@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 <LibCore/Directory.h>
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#include <LibCore/SessionManagement.h>
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#include <LibCore/System.h>
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#ifdef AK_OS_SERENITY
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# include <LibSystem/syscall.h>
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#endif
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namespace Core::SessionManagement {
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ErrorOr<pid_t> root_session_id([[maybe_unused]] Optional<pid_t> force_sid)
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{
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#ifdef AK_OS_SERENITY
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int rc = syscall(SC_get_root_session_id, force_sid.value_or(-1));
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if (rc < 0) {
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return Error::from_syscall("get_root_session_id"sv, rc);
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}
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return static_cast<pid_t>(rc);
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#else
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return 0;
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#endif
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}
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ErrorOr<void> logout(Optional<pid_t> force_sid)
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{
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pid_t sid = TRY(root_session_id(force_sid));
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TRY(System::kill(-sid, SIGTERM));
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return {};
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}
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ErrorOr<DeprecatedString> parse_path_with_sid(StringView general_path, Optional<pid_t> force_sid)
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{
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if (general_path.contains("%sid"sv)) {
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pid_t sid = TRY(root_session_id(force_sid));
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return general_path.replace("%sid"sv, DeprecatedString::number(sid), ReplaceMode::All);
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}
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return DeprecatedString(general_path);
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}
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ErrorOr<void> create_session_temporary_directory_if_needed(uid_t uid, gid_t gid, Optional<pid_t> force_sid)
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{
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pid_t sid = TRY(root_session_id(force_sid));
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auto const temporary_directory = DeprecatedString::formatted("/tmp/session/{}", sid);
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auto directory = TRY(Core::Directory::create(temporary_directory, Core::Directory::CreateDirectories::Yes));
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TRY(directory.chown(uid, gid));
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return {};
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}
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}
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