6 files changed, 42 insertions, 38 deletions
diff --git a/library/std/src/sys/unix/fs.rs b/library/std/src/sys/unix/fs.rs
index 818914a2df0..d5f50d77911 100644
--- a/library/std/src/sys/unix/fs.rs
+++ b/library/std/src/sys/unix/fs.rs
@@ -243,17 +243,15 @@ struct InnerReadDir {
 
 pub struct ReadDir {
     inner: Arc<InnerReadDir>,
-    #[cfg(not(any(
-        target_os = "android",
-        target_os = "linux",
-        target_os = "solaris",
-        target_os = "illumos",
-        target_os = "fuchsia",
-        target_os = "redox",
-    )))]
     end_of_stream: bool,
 }
 
+impl ReadDir {
+    fn new(inner: InnerReadDir) -> Self {
+        Self { inner: Arc::new(inner), end_of_stream: false }
+    }
+}
+
 struct Dir(*mut libc::DIR);
 
 unsafe impl Send for Dir {}
@@ -594,6 +592,10 @@ impl Iterator for ReadDir {
         target_os = "illumos"
     ))]
     fn next(&mut self) -> Option<io::Result<DirEntry>> {
+        if self.end_of_stream {
+            return None;
+        }
+
         unsafe {
             loop {
                 // As of POSIX.1-2017, readdir() is not required to be thread safe; only
@@ -604,8 +606,12 @@ impl Iterator for ReadDir {
                 super::os::set_errno(0);
                 let entry_ptr = readdir64(self.inner.dirp.0);
                 if entry_ptr.is_null() {
-                    // null can mean either the end is reached or an error occurred.
-                    // So we had to clear errno beforehand to check for an error now.
+                    // We either encountered an error, or reached the end.  Either way,
+                    // the next call to next() should return None.
+                    self.end_of_stream = true;
+
+                    // To distinguish between errors and end-of-directory, we had to clear
+                    // errno beforehand to check for an error now.
                     return match super::os::errno() {
                         0 => None,
                         e => Some(Err(Error::from_raw_os_error(e))),
@@ -1363,18 +1369,7 @@ pub fn readdir(path: &Path) -> io::Result<ReadDir> {
     } else {
         let root = path.to_path_buf();
         let inner = InnerReadDir { dirp: Dir(ptr), root };
-        Ok(ReadDir {
-            inner: Arc::new(inner),
-            #[cfg(not(any(
-                target_os = "android",
-                target_os = "linux",
-                target_os = "solaris",
-                target_os = "illumos",
-                target_os = "fuchsia",
-                target_os = "redox",
-            )))]
-            end_of_stream: false,
-        })
+        Ok(ReadDir::new(inner))
     }
 }
 
@@ -1755,7 +1750,6 @@ mod remove_dir_impl {
     use crate::os::unix::io::{AsRawFd, FromRawFd, IntoRawFd};
     use crate::os::unix::prelude::{OwnedFd, RawFd};
     use crate::path::{Path, PathBuf};
-    use crate::sync::Arc;
     use crate::sys::common::small_c_string::run_path_with_cstr;
     use crate::sys::{cvt, cvt_r};
 
@@ -1832,21 +1826,8 @@ mod remove_dir_impl {
         // a valid root is not needed because we do not call any functions involving the full path
         // of the DirEntrys.
         let dummy_root = PathBuf::new();
-        Ok((
-            ReadDir {
-                inner: Arc::new(InnerReadDir { dirp, root: dummy_root }),
-                #[cfg(not(any(
-                    target_os = "android",
-                    target_os = "linux",
-                    target_os = "solaris",
-                    target_os = "illumos",
-                    target_os = "fuchsia",
-                    target_os = "redox",
-                )))]
-                end_of_stream: false,
-            },
-            new_parent_fd,
-        ))
+        let inner = InnerReadDir { dirp, root: dummy_root };
+        Ok((ReadDir::new(inner), new_parent_fd))
     }
 
     #[cfg(any(
diff --git a/library/std/src/sys/unix/pipe.rs b/library/std/src/sys/unix/pipe.rs
index a56c275c942..a744d0ab640 100644
--- a/library/std/src/sys/unix/pipe.rs
+++ b/library/std/src/sys/unix/pipe.rs
@@ -58,6 +58,10 @@ impl AnonPipe {
         self.0.is_read_vectored()
     }
 
+    pub fn read_to_end(&self, buf: &mut Vec<u8>) -> io::Result<usize> {
+        self.0.read_to_end(buf)
+    }
+
     pub fn write(&self, buf: &[u8]) -> io::Result<usize> {
         self.0.write(buf)
     }
diff --git a/library/std/src/sys/unix/process/process_fuchsia.rs b/library/std/src/sys/unix/process/process_fuchsia.rs
index 66ea3db2015..4c99d758c93 100644
--- a/library/std/src/sys/unix/process/process_fuchsia.rs
+++ b/library/std/src/sys/unix/process/process_fuchsia.rs
@@ -35,6 +35,11 @@ impl Command {
         Ok((Process { handle: Handle::new(process_handle) }, ours))
     }
 
+    pub fn output(&mut self) -> io::Result<(ExitStatus, Vec<u8>, Vec<u8>)> {
+        let (proc, pipes) = self.spawn(Stdio::MakePipe, false)?;
+        crate::sys_common::process::wait_with_output(proc, pipes)
+    }
+
     pub fn exec(&mut self, default: Stdio) -> io::Error {
         if self.saw_nul() {
             return io::const_io_error!(
diff --git a/library/std/src/sys/unix/process/process_unix.rs b/library/std/src/sys/unix/process/process_unix.rs
index c0716a089bc..39d1c8b1d8e 100644
--- a/library/std/src/sys/unix/process/process_unix.rs
+++ b/library/std/src/sys/unix/process/process_unix.rs
@@ -133,6 +133,11 @@ impl Command {
         }
     }
 
+    pub fn output(&mut self) -> io::Result<(ExitStatus, Vec<u8>, Vec<u8>)> {
+        let (proc, pipes) = self.spawn(Stdio::MakePipe, false)?;
+        crate::sys_common::process::wait_with_output(proc, pipes)
+    }
+
     // Attempts to fork the process. If successful, returns Ok((0, -1))
     // in the child, and Ok((child_pid, -1)) in the parent.
     #[cfg(not(target_os = "linux"))]
diff --git a/library/std/src/sys/unix/process/process_unsupported.rs b/library/std/src/sys/unix/process/process_unsupported.rs
index 72f9f3f9ca7..f28ca58d020 100644
--- a/library/std/src/sys/unix/process/process_unsupported.rs
+++ b/library/std/src/sys/unix/process/process_unsupported.rs
@@ -20,6 +20,10 @@ impl Command {
         unsupported()
     }
 
+    pub fn output(&mut self) -> io::Result<(ExitStatus, Vec<u8>, Vec<u8>)> {
+        unsupported()
+    }
+
     pub fn exec(&mut self, _default: Stdio) -> io::Error {
         unsupported_err()
     }
diff --git a/library/std/src/sys/unix/process/process_vxworks.rs b/library/std/src/sys/unix/process/process_vxworks.rs
index 200ef671967..f549d37c301 100644
--- a/library/std/src/sys/unix/process/process_vxworks.rs
+++ b/library/std/src/sys/unix/process/process_vxworks.rs
@@ -108,6 +108,11 @@ impl Command {
         }
     }
 
+    pub fn output(&mut self) -> io::Result<(ExitStatus, Vec<u8>, Vec<u8>)> {
+        let (proc, pipes) = self.spawn(Stdio::MakePipe, false)?;
+        crate::sys_common::process::wait_with_output(proc, pipes)
+    }
+
     pub fn exec(&mut self, default: Stdio) -> io::Error {
         let ret = Command::spawn(self, default, false);
         match ret {