From f95dccdb45ad619549e74e4f480c041200de9dfa Mon Sep 17 00:00:00 2001
From: Tim Ledbetter <timledbetter@gmail.com>
Date: Fri, 9 Jun 2023 17:22:07 +0100
Subject: [PATCH] Kernel+LibCore: Add process creation time to
 `/sys/kernel/processes`

---
 Kernel/FileSystem/SysFS/Subsystems/Kernel/Processes.cpp | 1 +
 Userland/Libraries/LibCore/ProcessStatisticsReader.cpp  | 1 +
 Userland/Libraries/LibCore/ProcessStatisticsReader.h    | 2 ++
 3 files changed, 4 insertions(+)

diff --git a/Kernel/FileSystem/SysFS/Subsystems/Kernel/Processes.cpp b/Kernel/FileSystem/SysFS/Subsystems/Kernel/Processes.cpp
index 1b21e1b0e17..c07618cb8c4 100644
--- a/Kernel/FileSystem/SysFS/Subsystems/Kernel/Processes.cpp
+++ b/Kernel/FileSystem/SysFS/Subsystems/Kernel/Processes.cpp
@@ -83,6 +83,7 @@ ErrorOr<void> SysFSOverallProcesses::try_generate(KBufferBuilder& builder)
         }
         TRY(process.name().with([&](auto& process_name) { return process_object.add("name"sv, process_name->view()); }));
         TRY(process_object.add("executable"sv, process.executable() ? TRY(process.executable()->try_serialize_absolute_path())->view() : ""sv));
+        TRY(process_object.add("creation_time"sv, process.creation_time().nanoseconds_since_epoch()));
 
         size_t amount_virtual = 0;
         size_t amount_resident = 0;
diff --git a/Userland/Libraries/LibCore/ProcessStatisticsReader.cpp b/Userland/Libraries/LibCore/ProcessStatisticsReader.cpp
index 651e3ad2642..aff504a9e45 100644
--- a/Userland/Libraries/LibCore/ProcessStatisticsReader.cpp
+++ b/Userland/Libraries/LibCore/ProcessStatisticsReader.cpp
@@ -42,6 +42,7 @@ ErrorOr<AllProcessesStatistics> ProcessStatisticsReader::get_all(SeekableStream&
         process.tty = process_object.get_deprecated_string("tty"sv).value_or("");
         process.pledge = process_object.get_deprecated_string("pledge"sv).value_or("");
         process.veil = process_object.get_deprecated_string("veil"sv).value_or("");
+        process.creation_time = UnixDateTime::from_nanoseconds_since_epoch(process_object.get_i64("creation_time"sv).value_or(0));
         process.amount_virtual = process_object.get_u32("amount_virtual"sv).value_or(0);
         process.amount_resident = process_object.get_u32("amount_resident"sv).value_or(0);
         process.amount_shared = process_object.get_u32("amount_shared"sv).value_or(0);
diff --git a/Userland/Libraries/LibCore/ProcessStatisticsReader.h b/Userland/Libraries/LibCore/ProcessStatisticsReader.h
index ffdd8a69dc7..c42576dab95 100644
--- a/Userland/Libraries/LibCore/ProcessStatisticsReader.h
+++ b/Userland/Libraries/LibCore/ProcessStatisticsReader.h
@@ -7,6 +7,7 @@
 #pragma once
 
 #include <AK/DeprecatedString.h>
+#include <AK/Time.h>
 #include <AK/Vector.h>
 #include <unistd.h>
 
@@ -49,6 +50,7 @@ struct ProcessStatistics {
     DeprecatedString tty;
     DeprecatedString pledge;
     DeprecatedString veil;
+    UnixDateTime creation_time;
     size_t amount_virtual;
     size_t amount_resident;
     size_t amount_shared;