From 32810a920f892f8f99c400da45e79166fdfc583f Mon Sep 17 00:00:00 2001
From: Andreas Kling <awesomekling@gmail.com>
Date: Thu, 22 Aug 2019 21:16:49 +0200
Subject: [PATCH] Kernel: Implement kill(0, signal)

This sends the signal to everyone in the same process group as the
calling process.
---
 Kernel/Process.cpp | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/Kernel/Process.cpp b/Kernel/Process.cpp
index 3f81dd5f2d..b0b4ccfa59 100644
--- a/Kernel/Process.cpp
+++ b/Kernel/Process.cpp
@@ -1298,8 +1298,11 @@ int Process::sys$kill(pid_t pid, int signal)
     if (signal < 0 || signal >= 32)
         return -EINVAL;
     if (pid == 0) {
-        // FIXME: Send to same-group processes.
-        ASSERT(pid != 0);
+        Process::for_each_in_pgrp(pgid(), [&](auto& process) {
+            process.send_signal(signal, this);
+            return IterationDecision::Continue;
+        });
+        return 0;
     }
     if (pid == -1) {
         // FIXME: Send to all processes.