From 37f24d8c1cea9ae85a72c695ec4f3b5f9174a157 Mon Sep 17 00:00:00 2001
From: nastys <@a.a>
Date: Mon, 10 Jan 2022 14:15:04 +0100
Subject: [PATCH] Log maxfiles to file and stderr on *NIX

---
 rpcs3/rpcs3qt/gui_application.cpp | 12 ++++++++++++
 rpcs3/util/sysinfo.cpp            | 14 ++++++++++++++
 rpcs3/util/sysinfo.hpp            |  2 ++
 3 files changed, 28 insertions(+)

diff --git a/rpcs3/rpcs3qt/gui_application.cpp b/rpcs3/rpcs3qt/gui_application.cpp
index fc12231951..02075e78af 100644
--- a/rpcs3/rpcs3qt/gui_application.cpp
+++ b/rpcs3/rpcs3qt/gui_application.cpp
@@ -35,6 +35,7 @@
 #include <QDirIterator>
 #include <QFileInfo>
 #include <QSound>
+#include <QMessageBox>
 
 #include <clocale>
 
@@ -105,6 +106,17 @@ bool gui_application::Init()
 		welcome->exec();
 	}
 
+	// Check maxfiles
+	if (utils::get_maxfiles() < 4096)
+	{
+		QMessageBox::warning(nullptr,
+							 tr("Warning"),
+							 tr("The current limit of maximum file descriptors is too low.\n"
+								"Some games will crash.\n"
+								"\n"
+								"Please increase the limit before running RPCS3."));
+	}
+
 	if (m_main_window && !m_main_window->Init(m_with_cli_boot))
 	{
 		return false;
diff --git a/rpcs3/util/sysinfo.cpp b/rpcs3/util/sysinfo.cpp
index fad4ee2fe2..ce95411627 100755
--- a/rpcs3/util/sysinfo.cpp
+++ b/rpcs3/util/sysinfo.cpp
@@ -11,6 +11,7 @@
 #include "stringapiset.h"
 #else
 #include <unistd.h>
+#include <sys/resource.h>
 #include <sys/utsname.h>
 #include <errno.h>
 #endif
@@ -358,6 +359,19 @@ std::string utils::get_OS_version()
 	return output;
 }
 
+int utils::get_maxfiles()
+{
+#ifdef _WIN32
+	// Virtually unlimited on Windows
+	return INT_MAX;
+#else
+	struct rlimit limits;
+	ensure(getrlimit(RLIMIT_NOFILE, &limits) == 0);
+
+	return limits.rlim_cur;
+#endif
+}
+
 static constexpr ullong round_tsc(ullong val)
 {
 	return utils::rounded_div(val, 1'000'000) * 1'000'000;
diff --git a/rpcs3/util/sysinfo.hpp b/rpcs3/util/sysinfo.hpp
index 4de9030164..987da95b68 100755
--- a/rpcs3/util/sysinfo.hpp
+++ b/rpcs3/util/sysinfo.hpp
@@ -51,6 +51,8 @@ namespace utils
 
 	std::string get_OS_version();
 
+	int get_maxfiles();
+
 	ullong get_tsc_freq();
 
 	u64 get_total_memory();