[OE-core] [pseudo][PATCH] Add statx glibc/syscall support

[Richard Purdie]

Modern distros (e.g. fedora30) are starting to use the new statx() syscall through
the newly exposed glibc wrapper function in software like coreutils (e.g. the ls
command). Add support to intercept this to pseudo.

Signed-off-by: Richard Purdie <richard.purdie at linuxfoundation.org>
---
 ports/linux/guts/statx.c | 48 ++++++++++++++++++++++++++++++++++++++++
 ports/linux/portdefs.h   |  1 +
 ports/linux/wrapfuncs.in |  1 +
 3 files changed, 50 insertions(+)
 create mode 100644 ports/linux/guts/statx.c

diff --git a/ports/linux/statx/guts/statx.c b/ports/linux/statx/guts/statx.c
new file mode 100644
index 0000000..a3259c4
--- /dev/null
+++ b/ports/linux/statx/guts/statx.c
@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2019 Linux Foundation
+ * Author: Richard Purdie
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ * int
+ * statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf) {
+ *	int rc = -1;
+ */
+	pseudo_msg_t *msg;
+	PSEUDO_STATBUF buf;
+	int save_errno;
+
+	rc = real_statx(dirfd, pathname, flags, mask, statxbuf);
+	save_errno = errno;
+	if (rc == -1) {
+		return rc;
+	}
+
+	buf.st_uid = statxbuf->stx_uid;
+	buf.st_gid = statxbuf->stx_gid;
+	buf.st_dev = makedev(statxbuf->stx_dev_major, statxbuf->stx_dev_minor);
+	buf.st_ino = statxbuf->stx_ino;
+	buf.st_mode = statxbuf->stx_mode;
+	buf.st_rdev = makedev(statxbuf->stx_rdev_major, statxbuf->stx_rdev_minor);
+	buf.st_nlink = statxbuf->stx_nlink;
+	msg = pseudo_client_op(OP_STAT, 0, -1, dirfd, pathname, &buf);
+	if (msg && msg->result == RESULT_SUCCEED) {
+		pseudo_debug(PDBGF_FILE, "statx(path %s), flags %o, stat rc %d, stat uid %o\n", pathname, flags, rc, statxbuf->stx_uid);
+		statxbuf->stx_uid = msg->uid;
+		statxbuf->stx_gid = msg->gid;
+		statxbuf->stx_mode = msg->mode;
+		statxbuf->stx_rdev_major = major(msg->rdev);
+		statxbuf->stx_rdev_minor = minor(msg->rdev);
+	} else {
+		pseudo_debug(PDBGF_FILE, "statx(path %s) failed, flags %o, stat rc %d, stat uid %o\n", pathname, flags, rc, statxbuf->stx_uid);
+	}
+	errno = save_errno;
+/*	return rc;
+ * }
+ */
diff --git a/ports/linux/statx/portdefs.h b/ports/linux/statx/portdefs.h
new file mode 100644
index 0000000..bf934dc
--- /dev/null
+++ b/ports/linux/statx/portdefs.h
@@ -0,0 +1,6 @@
+/*
+ * SPDX-License-Identifier: LGPL-2.1-only
+ *
+ */
+#include <sys/stat.h>
+#include <sys/sysmacros.h>
diff --git a/ports/linux/statx/wrapfuncs.in b/ports/linux/statx/wrapfuncs.in
new file mode 100644
index 0000000..c9cd4c3
--- /dev/null
+++ b/ports/linux/statx/wrapfuncs.in
@@ -0,0 +1 @@
+int statx(int dirfd, const char *pathname, int flags, unsigned int mask, struct statx *statxbuf);
diff --git a/ports/linux/subports b/ports/linux/subports
index a29044a..49081bf 100755
--- a/ports/linux/subports
+++ b/ports/linux/subports
@@ -54,3 +54,13 @@ else
 fi
 rm -f dummy.c dummy.o
 
+cat > dummy.c <<EOF
+#define _GNU_SOURCE
+#include <sys/stat.h>
+struct statx x;
+EOF
+if ${CC} -c -o dummy.o dummy.c >/dev/null 2>&1; then
+	echo "linux/statx"
+fi
+rm -f dummy.c dummy.o
+