Statx (#632)

* 实现statx及测试的应用程序

user/apps/test_statx/src/main.rs

@@ -0,0 +1,63 @@
+use libc::syscall;
+use libc::AT_FDCWD;
+use std::ffi::CString;
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct Statx {
+    pub stx_mask: u32,
+    pub stx_blksize: u32,
+    pub stx_attributes: u64,
+    pub stx_nlink: u32,
+    pub stx_uid: u32,
+    pub stx_gid: u32,
+    pub stx_mode: u16,
+    __statx_pad1: [u16; 1],
+    pub stx_ino: u64,
+    pub stx_size: u64,
+    pub stx_blocks: u64,
+    pub stx_attributes_mask: u64,
+    pub stx_atime: StatxTimestamp,
+    pub stx_btime: StatxTimestamp,
+    pub stx_ctime: StatxTimestamp,
+    pub stx_mtime: StatxTimestamp,
+    pub stx_rdev_major: u32,
+    pub stx_rdev_minor: u32,
+    pub stx_dev_major: u32,
+    pub stx_dev_minor: u32,
+    pub stx_mnt_id: u64,
+    pub stx_dio_mem_align: u32,
+    pub stx_dio_offset_align: u32,
+    __statx_pad3: [u64; 12],
+}
+
+#[derive(Debug, Clone, Copy)]
+#[repr(C)]
+pub struct StatxTimestamp {
+    pub tv_sec: i64,
+    pub tv_nsec: u32,
+    pub __statx_timestamp_pad1: [i32; 1],
+}
+
+fn main() {
+    let path = CString::new("/bin/about.elf").expect("Failed to create CString");
+    let mut statxbuf: Statx = unsafe { std::mem::zeroed() };
+    let x = sc::nr::STATX as i64;
+
+    let result = unsafe {
+        syscall(
+            x,
+            AT_FDCWD,
+            path.as_ptr(),
+            libc::AT_SYMLINK_NOFOLLOW,
+            0x7ff,
+            &mut statxbuf,
+        )
+    };
+
+    if result != -1 {
+        println!("statx succeeded: {:?}", statxbuf);
+    } else {
+        eprintln!("statx failed");
+    }
+}