From 67a31befa672890e23ef530fa4376a787edff892 Mon Sep 17 00:00:00 2001
From: Marc Tiehuis <marctiehuis@gmail.com>
Date: Sun, 10 Sep 2017 05:48:44 +1200
Subject: Add exit function (#450)

---
 std/os/index.zig | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

(limited to 'std/os')

diff --git a/std/os/index.zig b/std/os/index.zig
index 2912be2cc8..1a5e98ea9f 100644
--- a/std/os/index.zig
+++ b/std/os/index.zig
@@ -112,6 +112,30 @@ pub coldcc fn abort() -> noreturn {
     }
 }
 
+/// Exits the program cleanly with the specified status code.
+pub coldcc fn exit(status: i32) -> noreturn {
+    if (builtin.link_libc) {
+        c.exit(status);
+    }
+    switch (builtin.os) {
+        Os.linux, Os.darwin, Os.macosx, Os.ios => {
+            posix.exit(status)
+        },
+        Os.windows => {
+            // Map a possibly negative status code to a non-negative status for the systems default
+            // integer width.
+            const p_status = if (@sizeOf(c_uint) < @sizeOf(u32)) {
+                @truncate(c_uint, @bitCast(u32, status))
+            } else {
+                c_uint(@bitCast(u32, status))
+            };
+
+            windows.ExitProcess(p_status)
+        },
+        else => @compileError("Unsupported OS"),
+    }
+}
+
 /// Calls POSIX close, and keeps trying if it gets interrupted.
 pub fn posixClose(fd: i32) {
     while (true) {
-- 
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