From a67f140d2f1247d3996f763dd36e55cbecb09eef Mon Sep 17 00:00:00 2001
From: Joran Dirk Greef <joran@ronomon.com>
Date: Sun, 1 Nov 2020 11:55:27 +0200
Subject: [PATCH] Add test

---
 lib/std/os/linux/test.zig | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/lib/std/os/linux/test.zig b/lib/std/os/linux/test.zig
index 7599cfc395..24c96cdd70 100644
--- a/lib/std/os/linux/test.zig
+++ b/lib/std/os/linux/test.zig
@@ -11,6 +11,25 @@ const elf = std.elf;
 const expect = std.testing.expect;
 const fs = std.fs;
 
+test "fallocate" {
+    const path = "test_fallocate";
+    const file = try fs.cwd().createFile(path, .{ .truncate = true, .mode = 0o666 });
+    defer file.close();
+    defer fs.cwd().deleteFile(path) catch {};
+
+    expect((try file.stat()).size == 0);
+
+    const len: u64 = 65536;
+    switch (linux.getErrno(linux.fallocate(file.handle, 0, 0, len))) {
+        0 => {},
+        linux.ENOSYS => return error.SkipZigTest,
+        linux.EOPNOTSUPP => return error.SkipZigTest,
+        else => unreachable,
+    }
+
+    expect((try file.stat()).size == len);
+}
+
 test "getpid" {
     expect(linux.getpid() != 0);
 }