From b1d36243e5026f9e8dcff4f19b18181311a639b2 Mon Sep 17 00:00:00 2001
From: AnotherTest <ali.mpfard@gmail.com>
Date: Sat, 24 Oct 2020 11:23:02 +0330
Subject: [PATCH] UserspaceEmulator: Add support for setgroups

---
 DevTools/UserspaceEmulator/Emulator.cpp | 11 +++++++++++
 DevTools/UserspaceEmulator/Emulator.h   |  1 +
 2 files changed, 12 insertions(+)

diff --git a/DevTools/UserspaceEmulator/Emulator.cpp b/DevTools/UserspaceEmulator/Emulator.cpp
index 61df845f1a..ce88544dae 100644
--- a/DevTools/UserspaceEmulator/Emulator.cpp
+++ b/DevTools/UserspaceEmulator/Emulator.cpp
@@ -335,6 +335,8 @@ u32 Emulator::virt_syscall(u32 function, u32 arg1, u32 arg2, u32 arg3)
         return virt$fcntl(arg1, arg2, arg3);
     case SC_getgroups:
         return virt$getgroups(arg1, arg2);
+    case SC_setgroups:
+        return virt$setgroups(arg1, arg2);
     case SC_lseek:
         return virt$lseek(arg1, arg2, arg3);
     case SC_socket:
@@ -742,6 +744,15 @@ int Emulator::virt$getgroups(ssize_t count, FlatPtr groups)
     return 0;
 }
 
+int Emulator::virt$setgroups(ssize_t count, FlatPtr groups)
+{
+    if (!count)
+        return syscall(SC_setgroups, 0, nullptr);
+
+    auto buffer = mmu().copy_buffer_from_vm(groups, count * sizeof(gid_t));
+    return syscall(SC_setgroups, count, buffer.data());
+}
+
 u32 Emulator::virt$fcntl(int fd, int cmd, u32 arg)
 {
     switch (cmd) {
diff --git a/DevTools/UserspaceEmulator/Emulator.h b/DevTools/UserspaceEmulator/Emulator.h
index a74f648d30..19e3a52054 100644
--- a/DevTools/UserspaceEmulator/Emulator.h
+++ b/DevTools/UserspaceEmulator/Emulator.h
@@ -126,6 +126,7 @@ private:
     int virt$fstat(int, FlatPtr);
     u32 virt$fcntl(int fd, int, u32);
     int virt$getgroups(ssize_t count, FlatPtr);
+    int virt$setgroups(ssize_t count, FlatPtr);
     int virt$lseek(int fd, off_t offset, int whence);
     int virt$socket(int, int, int);
     int virt$getsockopt(FlatPtr);