mirror of
https://github.com/RGBCube/serenity
synced 2025-05-31 08:48:11 +00:00
d5871f5717
Similar to POSIX read, the basic read and write functions of AK::Stream do not have a lower limit of how much data they read or write (apart from "none at all"). Rename the functions to "read some [data]" and "write some [data]" (with "data" being omitted, since everything here is reading and writing data) to make them sufficiently distinct from the functions that ensure to use the entire buffer (which should be the go-to function for most usages). No functional changes, just a lot of new FIXMEs.
79 lines
2.3 KiB
C++
79 lines
2.3 KiB
C++
/*
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* Copyright (c) 2020-2021, Andreas Kling <kling@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/Assertions.h>
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#include <AK/ByteBuffer.h>
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#include <AK/JsonObject.h>
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#include <AK/JsonValue.h>
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#include <LibCore/ArgsParser.h>
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#include <LibCore/DateTime.h>
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#include <LibCore/File.h>
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#include <LibCore/System.h>
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#include <LibMain/Main.h>
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#include <unistd.h>
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ErrorOr<int> serenity_main(Main::Arguments arguments)
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{
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TRY(Core::System::pledge("stdio wpath cpath"));
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TRY(Core::System::unveil("/var/run/utmp", "rwc"));
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TRY(Core::System::unveil(nullptr, nullptr));
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pid_t pid = 0;
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bool flag_create = false;
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bool flag_delete = false;
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StringView tty_name;
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StringView from;
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Core::ArgsParser args_parser;
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args_parser.add_option(flag_create, "Create entry", "create", 'c');
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args_parser.add_option(flag_delete, "Delete entry", "delete", 'd');
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args_parser.add_option(pid, "PID", "PID", 'p', "PID");
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args_parser.add_option(from, "From", "from", 'f', "From");
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args_parser.add_positional_argument(tty_name, "TTY name", "tty");
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args_parser.parse(arguments);
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if (flag_create && flag_delete) {
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warnln("-c and -d are mutually exclusive");
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return 1;
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}
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dbgln("Updating utmp from UID={} GID={} EGID={} PID={}", getuid(), getgid(), getegid(), pid);
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auto file = TRY(Core::File::open("/var/run/utmp"sv, Core::File::OpenMode::ReadWrite));
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auto file_contents = TRY(file->read_until_eof());
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auto previous_json = TRY(JsonValue::from_string(file_contents));
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JsonObject json;
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if (!file_contents.is_empty()) {
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if (!previous_json.is_object()) {
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dbgln("Error: Could not parse JSON");
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} else {
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json = previous_json.as_object();
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}
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}
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if (flag_create) {
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JsonObject entry;
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entry.set("pid", pid);
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entry.set("uid", getuid());
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entry.set("from", from);
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entry.set("login_at", time(nullptr));
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json.set(tty_name, move(entry));
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} else {
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VERIFY(flag_delete);
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dbgln("Removing {} from utmp", tty_name);
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json.remove(tty_name);
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}
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TRY(file->seek(0, SeekMode::SetPosition));
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TRY(file->truncate(0));
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// FIXME: This should write the entire span.
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TRY(file->write_some(json.to_deprecated_string().bytes()));
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return 0;
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}
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