From 4f2b650534c5ec6bb16c8d4162cf42eb8374cb48 Mon Sep 17 00:00:00 2001
From: Andrew Hyatt <ahyattdev@icloud.com>
Date: Thu, 13 Apr 2017 19:09:10 -0700
Subject: [PATCH] Implement the getpriority(2) syscall

---
 src/kernel/emulation/linux/CMakeLists.txt     |  1 +
 .../emulation/linux/process/getpriority.c     |  7 +++++
 .../emulation/linux/process/getpriority.h     | 29 +++++++++++++++++++
 src/kernel/emulation/linux/syscalls.c         |  2 ++
 4 files changed, 39 insertions(+)
 create mode 100644 src/kernel/emulation/linux/process/getpriority.c
 create mode 100644 src/kernel/emulation/linux/process/getpriority.h

diff --git a/src/kernel/emulation/linux/CMakeLists.txt b/src/kernel/emulation/linux/CMakeLists.txt
index 518ef1aae..91fb0057d 100644
--- a/src/kernel/emulation/linux/CMakeLists.txt
+++ b/src/kernel/emulation/linux/CMakeLists.txt
@@ -112,6 +112,7 @@ set(emulation_sources
 	process/waitid.c
 	process/execve.c
 	process/posix_spawn.c
+	process/getpriority.c
 	signal/duct_signals.c
 	signal/kill.c
 	signal/sigaltstack.c
diff --git a/src/kernel/emulation/linux/process/getpriority.c b/src/kernel/emulation/linux/process/getpriority.c
new file mode 100644
index 000000000..4bf7fec70
--- /dev/null
+++ b/src/kernel/emulation/linux/process/getpriority.c
@@ -0,0 +1,7 @@
+#include "getpriority.h"
+
+int sys_getpriority(int which, id_t who) {
+	return LINUX_SYSCALL(__NR_getpriority, which, who);
+
+	// TODO: Errors
+}
diff --git a/src/kernel/emulation/linux/process/getpriority.h b/src/kernel/emulation/linux/process/getpriority.h
new file mode 100644
index 000000000..db5862344
--- /dev/null
+++ b/src/kernel/emulation/linux/process/getpriority.h
@@ -0,0 +1,29 @@
+#ifndef LINUX_GETPRIORITY_H
+#define LINUX_GETPRIORITY_H
+
+#include <sys/_types.h>
+#include <sys/_types/_id_t.h>
+#include "../errno.h"
+#include "../base.h"
+#include <linux-syscalls/linux.h>
+
+int sys_getpriority(int which, id_t who);
+
+// Same on BSD and Linux
+#define	PRIO_PROCESS	0
+#define	PRIO_PGRP	1
+#define	PRIO_USER	2
+
+// Unique to Darwin
+#define	PRIO_DARWIN_THREAD	3
+#define	PRIO_DARWIN_PROCESS	4
+
+// Same on BSD and Linux
+#define	PRIO_MIN	-20
+#define	PRIO_MAX	20
+
+// Unique to Darwin
+#define PRIO_DARWIN_BG 0x1000
+#define PRIO_DARWIN_NONUI 0x1001
+
+#endif
diff --git a/src/kernel/emulation/linux/syscalls.c b/src/kernel/emulation/linux/syscalls.c
index 9998091a1..ea8d5f3b2 100644
--- a/src/kernel/emulation/linux/syscalls.c
+++ b/src/kernel/emulation/linux/syscalls.c
@@ -86,6 +86,7 @@
 #include "process/wait4.h"
 #include "process/waitid.h"
 #include "process/execve.h"
+#include "process/getpriority.h"
 #include "misc/getentropy.h"
 #include "misc/getlogin.h"
 #include "misc/shared_region_check_np.h"
@@ -238,6 +239,7 @@ void* __bsd_syscall_table[600] = {
 	[95] = sys_fsync,
 	[97] = sys_socket,
 	[98] = sys_connect,
+	[100] = sys_getpriority,
 	[104] = sys_bind,
 	[105] = sys_setsockopt,
 	[106] = sys_listen,
-- 
2.51.2