From d3393ce25833c0afd7f0fa6b85fd6f3bd7ad520a Mon Sep 17 00:00:00 2001
From: Thiago Macieira <thiago.macieira@intel.com>
Date: Sun, 2 Jul 2017 14:57:21 -0700
Subject: Add support for statx(2) on Linux

This system call, new in Linux 4.11, gives us the file birth time. It's
also extensible, representing the fourth generation of stat(2) on Linux
(the original sys_stat(), sys_newstat(), sys_stat64() and now
sys_statx()), not to be confused with glibc's __xstat function, which
wraps a call to stat64. Anyway, the new one is designed to be extensible.

Now we get birth times on ext[34] on Linux too:
 Name:   .
 Path:   . (/home/tjmaciei/src/qt)
 Size:   4096    Type: Directory
 Attrs:   readable writable executable hidden nativepath
 Mode:   drwxr-xr-x
 Owner:  tjmaciei (1000) Group:  users (100)
 Access: 2017-07-02T14:47:49.608
 Birth:  2016-05-02T13:20:33.097
 Change: 2017-07-01T13:37:08.737
 Modified: 2017-07-01T13:37:08.737

It's not supported in any other filesystems I have (Linux sources show
xfs has the feature too). Even on ext4, it depends on whether the
filesystem was created with 256-byte inodes, which my /boot fs wasn't.

Change-Id: I8d96dea9955d4c749b99fffd14cda23ed60d5e72
Reviewed-by: Simon Hausmann <simon.hausmann@qt.io>
---
 src/corelib/configure.json | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

(limited to 'src/corelib/configure.json')

diff --git a/src/corelib/configure.json b/src/corelib/configure.json
index c8fede2b8f..8b503233a0 100644
--- a/src/corelib/configure.json
+++ b/src/corelib/configure.json
@@ -383,6 +383,19 @@
                 "main": "renameat2(AT_FDCWD, argv[1], AT_FDCWD, argv[2], RENAME_NOREPLACE | RENAME_WHITEOUT);"
             }
         },
+        "statx": {
+            "label": "statx() in libc",
+            "type": "compile",
+            "test": {
+                "head": "#define _ATFILE_SOURCE 1",
+                "include": [ "sys/types.h", "sys/stat.h", "unistd.h", "fcntl.h" ],
+                "main": [
+                    "struct statx statxbuf;",
+                    "unsigned int mask = STATX_BASIC_STATS;",
+                    "return statx(AT_FDCWD, \"\", AT_STATX_SYNC_AS_STAT, mask, &statxbuf);"
+                ]
+            }
+        },
         "syslog": {
             "label": "syslog",
             "type": "compile",
@@ -585,6 +598,11 @@
             "condition": "libs.slog2",
             "output": [ "privateFeature" ]
         },
+        "statx": {
+            "label": "statx() in libc",
+            "condition": "config.linux && tests.statx",
+            "output": [ "privateFeature" ]
+        },
         "syslog": {
             "label": "syslog",
             "autoDetect": false,
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