Fix cfgs for current libc

src/libstd/sys/unix/fs.rs

@@ -41,88 +41,137 @@
 
 pub struct File(FileDesc);
 
-#[derive(Clone)]
-pub struct FileAttr {
-    stat: stat64,
-    #[cfg(target_os = "linux")]
-    statx_extra_fields: Option<StatxExtraFields>,
-}
-
-#[cfg(target_os = "linux")]
-#[derive(Clone)]
-struct StatxExtraFields {
-    // This is needed to check if btime is supported by the filesystem.
-    stx_mask: u32,
-    stx_btime: libc::statx_timestamp,
+// FIXME: This should be available on Linux with all `target_arch` and `target_env`.
+// https://github.com/rust-lang/libc/issues/1545
+macro_rules! cfg_has_statx {
+    ({ $($then_tt:tt)* } else { $($else_tt:tt)* }) => {
+        cfg_if::cfg_if! {
+            if #[cfg(all(target_os = "linux", target_env = "gnu", any(
+                target_arch = "x86",
+                target_arch = "arm",
+                // target_arch = "mips",
+                target_arch = "powerpc",
+                target_arch = "x86_64",
+                // target_arch = "aarch64",
+                target_arch = "powerpc64",
+                // target_arch = "mips64",
+                // target_arch = "s390x",
+                target_arch = "sparc64",
+            )))] {
+                $($then_tt)*
+            } else {
+                $($else_tt)*
+            }
+        }
+    };
+    ($($block_inner:tt)*) => {
+        #[cfg(all(target_os = "linux", target_env = "gnu", any(
+            target_arch = "x86",
+            target_arch = "arm",
+            // target_arch = "mips",
+            target_arch = "powerpc",
+            target_arch = "x86_64",
+            // target_arch = "aarch64",
+            target_arch = "powerpc64",
+            // target_arch = "mips64",
+            // target_arch = "s390x",
+            target_arch = "sparc64",
+        )))]
+        {
+            $($block_inner)*
+        }
+    };
 }
 
-// We prefer `statx` on Linux if available, which contains file creation time.
-// Default `stat64` contains no creation time.
-#[cfg(target_os = "linux")]
-unsafe fn try_statx(
-    fd: c_int,
-    path: *const libc::c_char,
-    flags: i32,
-    mask: u32,
-) -> Option<io::Result<FileAttr>> {
-    use crate::sync::atomic::{AtomicBool, Ordering};
+cfg_has_statx! {{
+    #[derive(Clone)]
+    pub struct FileAttr {
+        stat: stat64,
+        statx_extra_fields: Option<StatxExtraFields>,
+    }
+
+    #[derive(Clone)]
+    struct StatxExtraFields {
+        // This is needed to check if btime is supported by the filesystem.
+        stx_mask: u32,
+        stx_btime: libc::statx_timestamp,
+    }
+
+    // We prefer `statx` on Linux if available, which contains file creation time.
+    // Default `stat64` contains no creation time.
+    unsafe fn try_statx(
+        fd: c_int,
+        path: *const libc::c_char,
+        flags: i32,
+        mask: u32,
+    ) -> Option<io::Result<FileAttr>> {
+        use crate::sync::atomic::{AtomicBool, Ordering};
+
+        // Linux kernel prior to 4.11 or glibc prior to glibc 2.28 don't support `statx`
+        // We store the availability in a global to avoid unnecessary syscalls
+        static HAS_STATX: AtomicBool = AtomicBool::new(true);
+        syscall! {
+            fn statx(
+                fd: c_int,
+                pathname: *const libc::c_char,
+                flags: c_int,
+                mask: libc::c_uint,
+                statxbuf: *mut libc::statx
+            ) -> c_int
+        }
 
-    // Linux kernel prior to 4.11 or glibc prior to glibc 2.28 don't support `statx`
-    // We store the availability in a global to avoid unnecessary syscalls
-    static HAS_STATX: AtomicBool = AtomicBool::new(true);
-    syscall! {
-        fn statx(
-            fd: c_int,
-            pathname: *const libc::c_char,
-            flags: c_int,
-            mask: libc::c_uint,
-            statxbuf: *mut libc::statx
-        ) -> c_int
-    }
+        if !HAS_STATX.load(Ordering::Relaxed) {
+            return None;
+        }
 
-    if !HAS_STATX.load(Ordering::Relaxed) {
-        return None;
-    }
+        let mut buf: libc::statx = mem::zeroed();
+        let ret = cvt(statx(fd, path, flags, mask, &mut buf));
+        match ret {
+            Err(err) => match err.raw_os_error() {
+                Some(libc::ENOSYS) => {
+                    HAS_STATX.store(false, Ordering::Relaxed);
+                    return None;
+                }
+                _ => return Some(Err(err)),
+            }
+            Ok(_) => {
+                // We cannot fill `stat64` exhaustively because of private padding fields.
+                let mut stat: stat64 = mem::zeroed();
+                // `c_ulong` on gnu-mips, `dev_t` otherwise
+                stat.st_dev = libc::makedev(buf.stx_dev_major, buf.stx_dev_minor) as _;
+                stat.st_ino = buf.stx_ino as libc::ino64_t;
+                stat.st_nlink = buf.stx_nlink as libc::nlink_t;
+                stat.st_mode = buf.stx_mode as libc::mode_t;
+                stat.st_uid = buf.stx_uid as libc::uid_t;
+                stat.st_gid = buf.stx_gid as libc::gid_t;
+                stat.st_rdev = libc::makedev(buf.stx_rdev_major, buf.stx_rdev_minor) as _;
+                stat.st_size = buf.stx_size as off64_t;
+                stat.st_blksize = buf.stx_blksize as libc::blksize_t;
+                stat.st_blocks = buf.stx_blocks as libc::blkcnt64_t;
+                stat.st_atime = buf.stx_atime.tv_sec as libc::time_t;
+                // `i64` on gnu-x86_64-x32, `c_ulong` otherwise.
+                stat.st_atime_nsec = buf.stx_atime.tv_nsec as _;
+                stat.st_mtime = buf.stx_mtime.tv_sec as libc::time_t;
+                stat.st_mtime_nsec = buf.stx_mtime.tv_nsec as _;
+                stat.st_ctime = buf.stx_ctime.tv_sec as libc::time_t;
+                stat.st_ctime_nsec = buf.stx_ctime.tv_nsec as _;
+
+                let extra = StatxExtraFields {
+                    stx_mask: buf.stx_mask,
+                    stx_btime: buf.stx_btime,
+                };
 
-    let mut buf: libc::statx = mem::zeroed();
-    let ret = cvt(statx(fd, path, flags, mask, &mut buf));
-    match ret {
-        Err(err) => match err.raw_os_error() {
-            Some(libc::ENOSYS) => {
-                HAS_STATX.store(false, Ordering::Relaxed);
-                return None;
+                Some(Ok(FileAttr { stat, statx_extra_fields: Some(extra) }))
             }
-            _ => return Some(Err(err)),
         }
-        Ok(_) => {
-            // We cannot fill `stat64` exhaustively because of private padding fields.
-            let mut stat: stat64 = mem::zeroed();
-            stat.st_dev = libc::makedev(buf.stx_dev_major, buf.stx_dev_minor);
-            stat.st_ino = buf.stx_ino as libc::ino64_t;
-            stat.st_nlink = buf.stx_nlink as libc::nlink_t;
-            stat.st_mode = buf.stx_mode as libc::mode_t;
-            stat.st_uid = buf.stx_uid as libc::uid_t;
-            stat.st_gid = buf.stx_gid as libc::gid_t;
-            stat.st_rdev = libc::makedev(buf.stx_rdev_major, buf.stx_rdev_minor);
-            stat.st_size = buf.stx_size as off64_t;
-            stat.st_blksize = buf.stx_blksize as libc::blksize_t;
-            stat.st_blocks = buf.stx_blocks as libc::blkcnt64_t;
-            stat.st_atime = buf.stx_atime.tv_sec as libc::time_t;
-            stat.st_atime_nsec = buf.stx_atime.tv_nsec as libc::c_long;
-            stat.st_mtime = buf.stx_mtime.tv_sec as libc::time_t;
-            stat.st_mtime_nsec = buf.stx_mtime.tv_nsec as libc::c_long;
-            stat.st_ctime = buf.stx_ctime.tv_sec as libc::time_t;
-            stat.st_ctime_nsec = buf.stx_ctime.tv_nsec as libc::c_long;
-
-            let extra = StatxExtraFields {
-                stx_mask: buf.stx_mask,
-                stx_btime: buf.stx_btime,
-            };
+    }
 
-            Some(Ok(FileAttr { stat, statx_extra_fields: Some(extra) }))
-        }
+} else {
+    #[derive(Clone)]
+    pub struct FileAttr {
+        stat: stat64,
     }
-}
+}}
 
 // all DirEntry's will have a reference to this struct
 struct InnerReadDir {
@@ -175,15 +224,21 @@ pub struct FileType { mode: mode_t }
 #[derive(Debug)]
 pub struct DirBuilder { mode: mode_t }
 
-impl FileAttr {
-    fn from_stat64(stat: stat64) -> Self {
-        Self {
-            stat,
-            #[cfg(target_os = "linux")]
-            statx_extra_fields: None,
+cfg_has_statx! {{
+    impl FileAttr {
+        fn from_stat64(stat: stat64) -> Self {
+            Self { stat, statx_extra_fields: None }
         }
     }
+} else {
+    impl FileAttr {
+        fn from_stat64(stat: stat64) -> Self {
+            Self { stat }
+        }
+    }
+}}
 
+impl FileAttr {
     pub fn size(&self) -> u64 { self.stat.st_size as u64 }
     pub fn perm(&self) -> FilePermissions {
         FilePermissions { mode: (self.stat.st_mode as mode_t) }
@@ -250,8 +305,7 @@ pub fn created(&self) -> io::Result<SystemTime> {
                   target_os = "macos",
                   target_os = "ios")))]
     pub fn created(&self) -> io::Result<SystemTime> {
-        #[cfg(target_os = "linux")]
-        {
+        cfg_has_statx! {
             if let Some(ext) = &self.statx_extra_fields {
                 return if (ext.stx_mask & libc::STATX_BTIME) != 0 {
                     Ok(SystemTime::from(libc::timespec {
@@ -412,8 +466,7 @@ pub fn metadata(&self) -> io::Result<FileAttr> {
         let fd = cvt(unsafe { dirfd(self.dir.inner.dirp.0) })?;
         let name = self.entry.d_name.as_ptr();
 
-        #[cfg(target_os = "linux")]
-        {
+        cfg_has_statx! {
             if let Some(ret) = unsafe { try_statx(
                 fd,
                 name,
@@ -636,8 +689,7 @@ fn ensure_cloexec(_: &FileDesc) -> io::Result<()> {
     pub fn file_attr(&self) -> io::Result<FileAttr> {
         let fd = self.0.raw();
 
-        #[cfg(target_os = "linux")]
-        {
+        cfg_has_statx! {
             if let Some(ret) = unsafe { try_statx(
                 fd,
                 b"\0" as *const _ as *const libc::c_char,
@@ -930,8 +982,7 @@ pub fn link(src: &Path, dst: &Path) -> io::Result<()> {
 pub fn stat(p: &Path) -> io::Result<FileAttr> {
     let p = cstr(p)?;
 
-    #[cfg(target_os = "linux")]
-    {
+    cfg_has_statx! {
         if let Some(ret) = unsafe { try_statx(
             libc::AT_FDCWD,
             p.as_ptr(),
@@ -952,8 +1003,7 @@ pub fn stat(p: &Path) -> io::Result<FileAttr> {
 pub fn lstat(p: &Path) -> io::Result<FileAttr> {
     let p = cstr(p)?;
 
-    #[cfg(target_os = "linux")]
-    {
+    cfg_has_statx! {
         if let Some(ret) = unsafe { try_statx(
             libc::AT_FDCWD,
             p.as_ptr(),