Rollup merge of #98101 - vladimir-ea:stdlib_watch_os, r=thomcc

stdlib support for Apple WatchOS

This is a follow-up to rust-lang/rust#95243 (Add Apple WatchOS compiler targets) that adds stdlib support for Apple WatchOS.

`@deg4uss3r`
`@nagisa`

Author: Dylan-DPC

panic_unwind/src/gcc.rs

@@ -131,7 +131,7 @@ const UNWIND_DATA_REG: (i32, i32) = (10, 11); // x10, x11
 // https://github.com/gcc-mirror/gcc/blob/trunk/libgcc/unwind-c.c
 
 cfg_if::cfg_if! {
-    if #[cfg(all(target_arch = "arm", not(target_os = "ios"), not(target_os = "netbsd")))] {
+    if #[cfg(all(target_arch = "arm", not(target_os = "ios"), not(target_os = "watchos"), not(target_os = "netbsd")))] {
         // ARM EHABI personality routine.
         // https://infocenter.arm.com/help/topic/com.arm.doc.ihi0038b/IHI0038B_ehabi.pdf
         //

std/build.rs

@@ -15,6 +15,7 @@ fn main() {
         || target.contains("illumos")
         || target.contains("apple-darwin")
         || target.contains("apple-ios")
+        || target.contains("apple-watchos")
         || target.contains("uwp")
         || target.contains("windows")
         || target.contains("fuchsia")

std/src/os/mod.rs

@@ -141,7 +141,6 @@ pub mod openbsd;
 pub mod redox;
 #[cfg(target_os = "solaris")]
 pub mod solaris;
-
 #[cfg(target_os = "solid_asp3")]
 pub mod solid;
 #[cfg(target_os = "vxworks")]

std/src/os/unix/mod.rs

@@ -90,6 +90,7 @@ pub mod thread;
     target_os = "dragonfly",
     target_os = "freebsd",
     target_os = "ios",
+    target_os = "watchos",
     target_os = "macos",
     target_os = "netbsd",
     target_os = "openbsd"

std/src/os/unix/net/stream.rs

@@ -12,6 +12,7 @@ use crate::os::unix::io::{AsFd, AsRawFd, BorrowedFd, FromRawFd, IntoRawFd, Owned
     target_os = "freebsd",
     target_os = "ios",
     target_os = "macos",
+    target_os = "watchos",
     target_os = "netbsd",
     target_os = "openbsd"
 ))]
@@ -30,6 +31,7 @@ use crate::time::Duration;
     target_os = "freebsd",
     target_os = "ios",
     target_os = "macos",
+    target_os = "watchos",
     target_os = "netbsd",
     target_os = "openbsd"
 ))]
@@ -238,6 +240,7 @@ impl UnixStream {
         target_os = "freebsd",
         target_os = "ios",
         target_os = "macos",
+        target_os = "watchos",
         target_os = "netbsd",
         target_os = "openbsd"
     ))]

std/src/os/unix/ucred.rs

@@ -36,7 +36,7 @@ pub use self::impl_linux::peer_cred;
 ))]
 pub use self::impl_bsd::peer_cred;
 
-#[cfg(any(target_os = "macos", target_os = "ios",))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
 pub use self::impl_mac::peer_cred;
 
 #[cfg(any(target_os = "linux", target_os = "android"))]
@@ -97,7 +97,7 @@ pub mod impl_bsd {
     }
 }
 
-#[cfg(any(target_os = "macos", target_os = "ios",))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
 pub mod impl_mac {
     use super::UCred;
     use crate::os::unix::io::AsRawFd;

std/src/os/unix/ucred/tests.rs

@@ -9,6 +9,7 @@ use libc::{getegid, geteuid, getpid};
     target_os = "freebsd",
     target_os = "ios",
     target_os = "macos",
+    target_os = "watchos",
     target_os = "openbsd"
 ))]
 fn test_socket_pair() {
@@ -25,7 +26,7 @@ fn test_socket_pair() {
 }
 
 #[test]
-#[cfg(any(target_os = "linux", target_os = "ios", target_os = "macos",))]
+#[cfg(any(target_os = "linux", target_os = "ios", target_os = "macos", target_os = "watchos"))]
 fn test_socket_pair_pids(arg: Type) -> RetType {
     // Create two connected sockets and get their peer credentials.
     let (sock_a, sock_b) = UnixStream::pair().unwrap();

std/src/sys/unix/args.rs

@@ -151,7 +151,7 @@ mod imp {
     }
 }
 
-#[cfg(any(target_os = "macos", target_os = "ios"))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
 mod imp {
     use super::Args;
     use crate::ffi::CStr;
@@ -192,7 +192,7 @@ mod imp {
     // for i in (0..[args count])
     //      res.push([args objectAtIndex:i])
     // res
-    #[cfg(target_os = "ios")]
+    #[cfg(any(target_os = "ios", target_os = "watchos"))]
     pub fn args() -> Args {
         use crate::ffi::OsString;
         use crate::mem;

std/src/sys/unix/env.rs

@@ -31,6 +31,17 @@ pub mod os {
     pub const EXE_EXTENSION: &str = "";
 }
 
+#[cfg(target_os = "watchos")]
+pub mod os {
+    pub const FAMILY: &str = "unix";
+    pub const OS: &str = "watchos";
+    pub const DLL_PREFIX: &str = "lib";
+    pub const DLL_SUFFIX: &str = ".dylib";
+    pub const DLL_EXTENSION: &str = "dylib";
+    pub const EXE_SUFFIX: &str = "";
+    pub const EXE_EXTENSION: &str = "";
+}
+
 #[cfg(target_os = "freebsd")]
 pub mod os {
     pub const FAMILY: &str = "unix";

std/src/sys/unix/fd.rs

@@ -47,6 +47,7 @@ const READ_LIMIT: usize = libc::ssize_t::MAX as usize;
     target_os = "macos",
     target_os = "netbsd",
     target_os = "openbsd",
+    target_os = "watchos",
 ))]
 const fn max_iov() -> usize {
     libc::IOV_MAX as usize
@@ -67,7 +68,8 @@ const fn max_iov() -> usize {
     target_os = "macos",
     target_os = "netbsd",
     target_os = "openbsd",
-    target_os = "horizon"
+    target_os = "horizon",
+    target_os = "watchos",
 )))]
 const fn max_iov() -> usize {
     16 // The minimum value required by POSIX.

std/src/sys/unix/fs.rs

@@ -17,6 +17,7 @@ use crate::sys_common::{AsInner, AsInnerMut, FromInner, IntoInner};
     all(target_os = "linux", target_env = "gnu"),
     target_os = "macos",
     target_os = "ios",
+    target_os = "watchos",
 ))]
 use crate::sys::weak::syscall;
 #[cfg(target_os = "macos")]
@@ -27,6 +28,7 @@ use libc::{c_int, mode_t};
 #[cfg(any(
     target_os = "macos",
     target_os = "ios",
+    target_os = "watchos",
     all(target_os = "linux", target_env = "gnu")
 ))]
 use libc::c_char;
@@ -443,7 +445,8 @@ impl FileAttr {
         target_os = "freebsd",
         target_os = "openbsd",
         target_os = "macos",
-        target_os = "ios"
+        target_os = "ios",
+        target_os = "watchos",
     ))]
     pub fn created(&self) -> io::Result<SystemTime> {
         Ok(SystemTime::new(self.stat.st_birthtime as i64, self.stat.st_birthtime_nsec as i64))
@@ -453,7 +456,8 @@ impl FileAttr {
         target_os = "freebsd",
         target_os = "openbsd",
         target_os = "macos",
-        target_os = "ios"
+        target_os = "ios",
+        target_os = "watchos",
     )))]
     pub fn created(&self) -> io::Result<SystemTime> {
         cfg_has_statx! {
@@ -707,6 +711,7 @@ impl DirEntry {
     #[cfg(any(
         target_os = "macos",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "linux",
         target_os = "emscripten",
         target_os = "android",
@@ -737,6 +742,7 @@ impl DirEntry {
     #[cfg(any(
         target_os = "macos",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "netbsd",
         target_os = "openbsd",
         target_os = "freebsd",
@@ -754,6 +760,7 @@ impl DirEntry {
     #[cfg(not(any(
         target_os = "macos",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "netbsd",
         target_os = "openbsd",
         target_os = "freebsd",
@@ -911,11 +918,11 @@ impl File {
         cvt_r(|| unsafe { os_fsync(self.as_raw_fd()) })?;
         return Ok(());
 
-        #[cfg(any(target_os = "macos", target_os = "ios"))]
+        #[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
         unsafe fn os_fsync(fd: c_int) -> c_int {
             libc::fcntl(fd, libc::F_FULLFSYNC)
         }
-        #[cfg(not(any(target_os = "macos", target_os = "ios")))]
+        #[cfg(not(any(target_os = "macos", target_os = "ios", target_os = "watchos")))]
         unsafe fn os_fsync(fd: c_int) -> c_int {
             libc::fsync(fd)
         }
@@ -925,7 +932,7 @@ impl File {
         cvt_r(|| unsafe { os_datasync(self.as_raw_fd()) })?;
         return Ok(());
 
-        #[cfg(any(target_os = "macos", target_os = "ios"))]
+        #[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
         unsafe fn os_datasync(fd: c_int) -> c_int {
             libc::fcntl(fd, libc::F_FULLFSYNC)
         }
@@ -946,7 +953,8 @@ impl File {
             target_os = "linux",
             target_os = "macos",
             target_os = "netbsd",
-            target_os = "openbsd"
+            target_os = "openbsd",
+            target_os = "watchos",
         )))]
         unsafe fn os_datasync(fd: c_int) -> c_int {
             libc::fsync(fd)
@@ -1396,7 +1404,8 @@ fn open_to_and_set_permissions(
     target_os = "linux",
     target_os = "android",
     target_os = "macos",
-    target_os = "ios"
+    target_os = "ios",
+    target_os = "watchos",
 )))]
 pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
     let (mut reader, reader_metadata) = open_from(from)?;
@@ -1423,7 +1432,7 @@ pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
     }
 }
 
-#[cfg(any(target_os = "macos", target_os = "ios"))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
 pub fn copy(from: &Path, to: &Path) -> io::Result<u64> {
     use crate::sync::atomic::{AtomicBool, Ordering};
 

std/src/sys/unix/locks/pthread_condvar.rs

@@ -37,6 +37,7 @@ impl Condvar {
     #[cfg(any(
         target_os = "macos",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "l4re",
         target_os = "android",
         target_os = "redox"
@@ -58,6 +59,7 @@ impl Condvar {
     #[cfg(not(any(
         target_os = "macos",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "l4re",
         target_os = "android",
         target_os = "redox",
@@ -102,6 +104,7 @@ impl Condvar {
     #[cfg(not(any(
         target_os = "macos",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "android",
         target_os = "espidf",
         target_os = "horizon"
@@ -135,6 +138,7 @@ impl Condvar {
     #[cfg(any(
         target_os = "macos",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "android",
         target_os = "espidf",
         target_os = "horizon"

std/src/sys/unix/mod.rs

@@ -86,6 +86,7 @@ pub unsafe fn init(argc: isize, argv: *const *const u8) {
             // The poll on Darwin doesn't set POLLNVAL for closed fds.
             target_os = "macos",
             target_os = "ios",
+            target_os = "watchos",
             target_os = "redox",
             target_os = "l4re",
             target_os = "horizon",
@@ -329,7 +330,7 @@ cfg_if::cfg_if! {
         // See #41582 and https://blog.achernya.com/2013/03/os-x-has-silly-libsystem.html
         #[link(name = "resolv")]
         extern "C" {}
-    } else if #[cfg(target_os = "ios")] {
+    } else if #[cfg(any(target_os = "ios", target_os = "watchos"))] {
         #[link(name = "System")]
         #[link(name = "objc")]
         #[link(name = "Security", kind = "framework")]

std/src/sys/unix/os.rs

@@ -61,7 +61,7 @@ extern "C" {
     )]
     #[cfg_attr(any(target_os = "solaris", target_os = "illumos"), link_name = "___errno")]
     #[cfg_attr(
-        any(target_os = "macos", target_os = "ios", target_os = "freebsd"),
+        any(target_os = "macos", target_os = "ios", target_os = "freebsd", target_os = "watchos"),
         link_name = "__error"
     )]
     #[cfg_attr(target_os = "haiku", link_name = "_errnop")]
@@ -361,7 +361,7 @@ pub fn current_exe() -> io::Result<PathBuf> {
     }
 }
 
-#[cfg(any(target_os = "macos", target_os = "ios"))]
+#[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
 pub fn current_exe() -> io::Result<PathBuf> {
     unsafe {
         let mut sz: u32 = 0;
@@ -598,6 +598,7 @@ pub fn home_dir() -> Option<PathBuf> {
     #[cfg(any(
         target_os = "android",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "emscripten",
         target_os = "redox",
         target_os = "vxworks",
@@ -610,6 +611,7 @@ pub fn home_dir() -> Option<PathBuf> {
     #[cfg(not(any(
         target_os = "android",
         target_os = "ios",
+        target_os = "watchos",
         target_os = "emscripten",
         target_os = "redox",
         target_os = "vxworks",

std/src/sys/unix/rand.rs

@@ -14,6 +14,7 @@ pub fn hashmap_random_keys() -> (u64, u64) {
     unix,
     not(target_os = "macos"),
     not(target_os = "ios"),
+    not(target_os = "watchos"),
     not(target_os = "openbsd"),
     not(target_os = "freebsd"),
     not(target_os = "netbsd"),
@@ -195,7 +196,7 @@ mod imp {
 // once per thread in `hashmap_random_keys`. Therefore `SecRandomCopyBytes` is
 // only used on iOS where direct access to `/dev/urandom` is blocked by the
 // sandbox.
-#[cfg(target_os = "ios")]
+#[cfg(any(target_os = "ios", target_os = "watchos"))]
 mod imp {
     use crate::io;
     use crate::ptr;

std/src/sys/unix/thread.rs

@@ -139,7 +139,7 @@ impl Thread {
         }
     }
 
-    #[cfg(any(target_os = "macos", target_os = "ios"))]
+    #[cfg(any(target_os = "macos", target_os = "ios", target_os = "watchos"))]
     pub fn set_name(name: &CStr) {
         unsafe {
             libc::pthread_setname_np(name.as_ptr());