From c06d5ef114a385944289d8c6a849bf34e544fe55 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Fri, 10 Apr 2020 12:58:27 +0200
Subject: [PATCH] Kernel+LibC: Remove ESUCCESS

There's no official ESUCCESS==0 errno code, and it keeps breaking the
Lagom build when we use it, so let's just say 0 instead.
---
 Kernel/KResult.h               | 2 +-
 Kernel/Process.cpp             | 4 ++--
 Libraries/LibC/errno_numbers.h | 1 -
 Libraries/LibLine/Editor.cpp   | 2 +-
 4 files changed, 4 insertions(+), 5 deletions(-)

diff --git a/Kernel/KResult.h b/Kernel/KResult.h
index b4f1938b18e..12c974d1723 100644
--- a/Kernel/KResult.h
+++ b/Kernel/KResult.h
@@ -49,7 +49,7 @@ public:
     operator int() const { return m_error; }
     int error() const { return m_error; }
 
-    bool is_success() const { return m_error == ESUCCESS; }
+    bool is_success() const { return m_error == 0; }
     bool is_error() const { return !is_success(); }
 
 private:
diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index 230be187bed..c2ff7e291ab 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -3978,7 +3978,7 @@ int Process::sys$halt()
     dbg() << "attempting system shutdown...";
     IO::out16(0x604, 0x2000);
 
-    return ESUCCESS;
+    return 0;
 }
 
 int Process::sys$reboot()
@@ -3998,7 +3998,7 @@ int Process::sys$reboot()
     dbg() << "attempting reboot via KB Controller...";
     IO::out8(0x64, 0xFE);
 
-    return ESUCCESS;
+    return 0;
 }
 
 int Process::sys$mount(const Syscall::SC_mount_params* user_params)
diff --git a/Libraries/LibC/errno_numbers.h b/Libraries/LibC/errno_numbers.h
index e42eaebea9b..c805cf29858 100644
--- a/Libraries/LibC/errno_numbers.h
+++ b/Libraries/LibC/errno_numbers.h
@@ -26,7 +26,6 @@
 
 #pragma once
 
-#define ESUCCESS 0
 #define EPERM 1
 #define ENOENT 2
 #define ESRCH 3
diff --git a/Libraries/LibLine/Editor.cpp b/Libraries/LibLine/Editor.cpp
index 37f9671a0a5..58413ba4c4e 100644
--- a/Libraries/LibLine/Editor.cpp
+++ b/Libraries/LibLine/Editor.cpp
@@ -654,7 +654,7 @@ Vector<size_t, 2> Editor::vt_dsr()
     do {
         auto nread = read(0, buf + length, 16 - length);
         if (nread < 0) {
-            if (errno == ESUCCESS) {
+            if (errno == 0) {
                 // ????
                 continue;
             }