Add comment explaining when posix_spawn() can be supported.

bdrewery · bdrewery · commit ef73b3ae2eac · 2018-03-01T09:18:16.000-08:00
diff --git a/src/libstd/sys/unix/process/process_unix.rs b/src/libstd/sys/unix/process/process_unix.rs
@@ -242,6 +242,8 @@ impl Command {
         Ok(None)
     }
 
+    // Only support platforms for which posix_spawn() can return ENOENT
+    // directly.
     #[cfg(any(target_os = "macos", target_os = "freebsd"))]
     fn posix_spawn(&mut self, stdio: &ChildPipes, envp: Option<&CStringArray>)
         -> io::Result<Option<Process>>

Original file line number	Diff line number	Diff line change
`@@ -242,6 +242,8 @@ impl Command {`
`242`	`242`	`Ok(None)`
`243`	`243`	`}`
`244`	`244`
	`245`	`+ // Only support platforms for which posix_spawn() can return ENOENT`
	`246`	`+ // directly.`
`245`	`247`	`#[cfg(any(target_os = "macos", target_os = "freebsd"))]`
`246`	`248`	`fn posix_spawn(&mut self, stdio: &ChildPipes, envp: Option<&CStringArray>)`
`247`	`249`	`-> io::Result<Option<Process>>`