5 files changed, 25 insertions, 24 deletions
diff --git a/library/std/src/process.rs b/library/std/src/process.rs
index 5c68400114d..4bd06475e27 100644
--- a/library/std/src/process.rs
+++ b/library/std/src/process.rs
@@ -115,7 +115,7 @@ use crate::path::Path;
 use crate::str;
 use crate::sys::pipe::{read2, AnonPipe};
 use crate::sys::process as imp;
-#[unstable(feature = "command_access", issue = "44434")]
+#[stable(feature = "command_access", since = "1.57.0")]
 pub use crate::sys_common::process::CommandEnvs;
 use crate::sys_common::{AsInner, AsInnerMut, FromInner, IntoInner};
 
@@ -943,13 +943,12 @@ impl Command {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(command_access)]
     /// use std::process::Command;
     ///
     /// let cmd = Command::new("echo");
     /// assert_eq!(cmd.get_program(), "echo");
     /// ```
-    #[unstable(feature = "command_access", issue = "44434")]
+    #[stable(feature = "command_access", since = "1.57.0")]
     pub fn get_program(&self) -> &OsStr {
         self.inner.get_program()
     }
@@ -963,7 +962,6 @@ impl Command {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(command_access)]
     /// use std::ffi::OsStr;
     /// use std::process::Command;
     ///
@@ -972,7 +970,7 @@ impl Command {
     /// let args: Vec<&OsStr> = cmd.get_args().collect();
     /// assert_eq!(args, &["first", "second"]);
     /// ```
-    #[unstable(feature = "command_access", issue = "44434")]
+    #[stable(feature = "command_access", since = "1.57.0")]
     pub fn get_args(&self) -> CommandArgs<'_> {
         CommandArgs { inner: self.inner.get_args() }
     }
@@ -992,7 +990,6 @@ impl Command {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(command_access)]
     /// use std::ffi::OsStr;
     /// use std::process::Command;
     ///
@@ -1004,7 +1001,7 @@ impl Command {
     ///     (OsStr::new("TZ"), None)
     /// ]);
     /// ```
-    #[unstable(feature = "command_access", issue = "44434")]
+    #[stable(feature = "command_access", since = "1.57.0")]
     pub fn get_envs(&self) -> CommandEnvs<'_> {
         self.inner.get_envs()
     }
@@ -1016,7 +1013,6 @@ impl Command {
     /// # Examples
     ///
     /// ```
-    /// # #![feature(command_access)]
     /// use std::path::Path;
     /// use std::process::Command;
     ///
@@ -1025,7 +1021,7 @@ impl Command {
     /// cmd.current_dir("/bin");
     /// assert_eq!(cmd.get_current_dir(), Some(Path::new("/bin")));
     /// ```
-    #[unstable(feature = "command_access", issue = "44434")]
+    #[stable(feature = "command_access", since = "1.57.0")]
     pub fn get_current_dir(&self) -> Option<&Path> {
         self.inner.get_current_dir()
     }
@@ -1057,13 +1053,13 @@ impl AsInnerMut<imp::Command> for Command {
 ///
 /// This struct is created by [`Command::get_args`]. See its documentation for
 /// more.
-#[unstable(feature = "command_access", issue = "44434")]
+#[stable(feature = "command_access", since = "1.57.0")]
 #[derive(Debug)]
 pub struct CommandArgs<'a> {
     inner: imp::CommandArgs<'a>,
 }
 
-#[unstable(feature = "command_access", issue = "44434")]
+#[stable(feature = "command_access", since = "1.57.0")]
 impl<'a> Iterator for CommandArgs<'a> {
     type Item = &'a OsStr;
     fn next(&mut self) -> Option<&'a OsStr> {
@@ -1074,7 +1070,7 @@ impl<'a> Iterator for CommandArgs<'a> {
     }
 }
 
-#[unstable(feature = "command_access", issue = "44434")]
+#[stable(feature = "command_access", since = "1.57.0")]
 impl<'a> ExactSizeIterator for CommandArgs<'a> {
     fn len(&self) -> usize {
         self.inner.len()
diff --git a/library/std/src/sys/unix/mod.rs b/library/std/src/sys/unix/mod.rs
index 1c37f4ee498..2ba6c8d830e 100644
--- a/library/std/src/sys/unix/mod.rs
+++ b/library/std/src/sys/unix/mod.rs
@@ -307,6 +307,9 @@ cfg_if::cfg_if! {
         #[link(name = "zircon")]
         #[link(name = "fdio")]
         extern "C" {}
+    } else if #[cfg(all(target_os = "linux", target_env = "uclibc"))] {
+        #[link(name = "dl")]
+        extern "C" {}
     }
 }
 
diff --git a/library/std/src/sys/unix/stack_overflow.rs b/library/std/src/sys/unix/stack_overflow.rs
index e8747e39bcb..db1a2a26a89 100644
--- a/library/std/src/sys/unix/stack_overflow.rs
+++ b/library/std/src/sys/unix/stack_overflow.rs
@@ -143,14 +143,15 @@ mod imp {
     }
 
     unsafe fn get_stackp() -> *mut libc::c_void {
-        let stackp = mmap(
-            ptr::null_mut(),
-            SIGSTKSZ + page_size(),
-            PROT_READ | PROT_WRITE,
-            MAP_PRIVATE | MAP_ANON,
-            -1,
-            0,
-        );
+        // OpenBSD requires this flag for stack mapping
+        // otherwise the said mapping will fail as a no-op on most systems
+        // and has a different meaning on FreeBSD
+        #[cfg(any(target_os = "openbsd", target_os = "netbsd", target_os = "linux",))]
+        let flags = MAP_PRIVATE | MAP_ANON | libc::MAP_STACK;
+        #[cfg(not(any(target_os = "openbsd", target_os = "netbsd", target_os = "linux",)))]
+        let flags = MAP_PRIVATE | MAP_ANON;
+        let stackp =
+            mmap(ptr::null_mut(), SIGSTKSZ + page_size(), PROT_READ | PROT_WRITE, flags, -1, 0);
         if stackp == MAP_FAILED {
             panic!("failed to allocate an alternative stack: {}", io::Error::last_os_error());
         }
diff --git a/library/std/src/sys/unix/thread.rs b/library/std/src/sys/unix/thread.rs
index 891f3413e91..6f4863057ab 100644
--- a/library/std/src/sys/unix/thread.rs
+++ b/library/std/src/sys/unix/thread.rs
@@ -594,7 +594,8 @@ pub mod guard {
                 Some(stackaddr - guardsize..stackaddr)
             } else if cfg!(all(target_os = "linux", target_env = "musl")) {
                 Some(stackaddr - guardsize..stackaddr)
-            } else if cfg!(all(target_os = "linux", target_env = "gnu")) {
+            } else if cfg!(all(target_os = "linux", any(target_env = "gnu", target_env = "uclibc")))
+            {
                 // glibc used to include the guard area within the stack, as noted in the BUGS
                 // section of `man pthread_attr_getguardsize`.  This has been corrected starting
                 // with glibc 2.27, and in some distro backports, so the guard is now placed at the
diff --git a/library/std/src/sys_common/process.rs b/library/std/src/sys_common/process.rs
index 38007d5c414..3d71219756a 100644
--- a/library/std/src/sys_common/process.rs
+++ b/library/std/src/sys_common/process.rs
@@ -106,13 +106,13 @@ impl CommandEnv {
 /// This struct is created by
 /// [`Command::get_envs`][crate::process::Command::get_envs]. See its
 /// documentation for more.
-#[unstable(feature = "command_access", issue = "44434")]
+#[stable(feature = "command_access", since = "1.57.0")]
 #[derive(Debug)]
 pub struct CommandEnvs<'a> {
     iter: crate::collections::btree_map::Iter<'a, EnvKey, Option<OsString>>,
 }
 
-#[unstable(feature = "command_access", issue = "44434")]
+#[stable(feature = "command_access", since = "1.57.0")]
 impl<'a> Iterator for CommandEnvs<'a> {
     type Item = (&'a OsStr, Option<&'a OsStr>);
     fn next(&mut self) -> Option<Self::Item> {
@@ -123,7 +123,7 @@ impl<'a> Iterator for CommandEnvs<'a> {
     }
 }
 
-#[unstable(feature = "command_access", issue = "44434")]
+#[stable(feature = "command_access", since = "1.57.0")]
 impl<'a> ExactSizeIterator for CommandEnvs<'a> {
     fn len(&self) -> usize {
         self.iter.len()