From 5f71bf0cc7de17d0aa2703aabf4e0cad5f000ae8 Mon Sep 17 00:00:00 2001
From: Andreas Kling <kling@serenityos.org>
Date: Sun, 28 Mar 2021 17:50:08 +0200
Subject: [PATCH] Kernel+LibC: Implement sys$ioctl() FIONBIO

This is another (older) way of making a file descriptor non-blocking.
---
 Kernel/Syscalls/ioctl.cpp                   | 5 +++++
 Userland/Libraries/LibC/sys/ioctl_numbers.h | 4 +++-
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Kernel/Syscalls/ioctl.cpp b/Kernel/Syscalls/ioctl.cpp
index 2d06bffa34..acff91dfd1 100644
--- a/Kernel/Syscalls/ioctl.cpp
+++ b/Kernel/Syscalls/ioctl.cpp
@@ -26,6 +26,7 @@
 
 #include <Kernel/FileSystem/FileDescription.h>
 #include <Kernel/Process.h>
+#include <LibC/sys/ioctl_numbers.h>
 
 namespace Kernel {
 
@@ -34,6 +35,10 @@ KResultOr<int> Process::sys$ioctl(int fd, unsigned request, FlatPtr arg)
     auto description = file_description(fd);
     if (!description)
         return EBADF;
+    if (request == FIONBIO && arg != 0) {
+        description->set_blocking(false);
+        return KSuccess;
+    }
     return description->file().ioctl(*description, request, arg);
 }
 
diff --git a/Userland/Libraries/LibC/sys/ioctl_numbers.h b/Userland/Libraries/LibC/sys/ioctl_numbers.h
index df31bebaf9..345f2d43de 100644
--- a/Userland/Libraries/LibC/sys/ioctl_numbers.h
+++ b/Userland/Libraries/LibC/sys/ioctl_numbers.h
@@ -68,7 +68,8 @@ enum IOCtlNumber {
     SIOCSIFNETMASK,
     SIOCADDRT,
     SIOCDELRT,
-    FIBMAP
+    FIBMAP,
+    FIONBIO,
 };
 
 #define TIOCGPGRP TIOCGPGRP
@@ -94,3 +95,4 @@ enum IOCtlNumber {
 #define SIOCADDRT SIOCADDRT
 #define SIOCDELRT SIOCDELRT
 #define FIBMAP FIBMAP
+#define FIONBIO FIONBIO