From 6de90b3c935db0e3ec95a3ac4b390a1e98c4e10a Mon Sep 17 00:00:00 2001
From: apio <blobs.trading@gmail.com>
Date: Sat, 20 May 2023 12:48:17 +0200
Subject: [PATCH] libc: Add getrusage()

---
 libc/CMakeLists.txt         |  1 +
 libc/include/sys/resource.h | 20 ++++++++++++++++++++
 libc/src/sys/resource.cpp   | 13 +++++++++++++
 3 files changed, 34 insertions(+)
 create mode 100644 libc/include/sys/resource.h
 create mode 100644 libc/src/sys/resource.cpp

diff --git a/libc/CMakeLists.txt b/libc/CMakeLists.txt
index 1123601d..75033f6a 100644
--- a/libc/CMakeLists.txt
+++ b/libc/CMakeLists.txt
@@ -26,6 +26,7 @@ set(SOURCES
     src/sys/utsname.cpp
     src/sys/mount.cpp
     src/sys/pstat.cpp
+    src/sys/resource.cpp
 )
 
 if(${LUNA_ARCH} STREQUAL "x86_64")
diff --git a/libc/include/sys/resource.h b/libc/include/sys/resource.h
new file mode 100644
index 00000000..1f6a8d84
--- /dev/null
+++ b/libc/include/sys/resource.h
@@ -0,0 +1,20 @@
+/* sys/resource.h: System resource management. */
+
+#ifndef _SYS_RESOURCE_H
+#define _SYS_RESOURCE_H
+
+#include <bits/rusage.h>
+
+#ifdef __cplusplus
+extern "C"
+{
+#endif
+
+    /* Get this process or its children's resource usage. */
+    int getrusage(int who, struct rusage* ru);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif
diff --git a/libc/src/sys/resource.cpp b/libc/src/sys/resource.cpp
new file mode 100644
index 00000000..f408906d
--- /dev/null
+++ b/libc/src/sys/resource.cpp
@@ -0,0 +1,13 @@
+#include <bits/errno-return.h>
+#include <sys/resource.h>
+#include <sys/syscall.h>
+#include <unistd.h>
+
+extern "C"
+{
+    int getrusage(int who, struct rusage* ru)
+    {
+        long rc = syscall(SYS_getrusage, who, ru);
+        __errno_return(rc, int);
+    }
+}