Upgrade nix to 0.9 (map nix::Error to io::Error)

Cargo.toml

@@ -1,14 +1,14 @@
 [package]
 name = "os_pipe"
-version = "0.5.1"
+version = "0.5.2"
 authors = ["Jack O'Connor"]
 description = "a cross-platform library for opening OS pipes"
 repository = "https://github.com/oconnor663/os_pipe.rs"
 documentation = "https://docs.rs/os_pipe"
 license = "MIT"
 
 [target.'cfg(not(windows))'.dependencies]
-nix = "^0.8.0"
+nix = "^0.9.0"
 
 [target.'cfg(windows)'.dependencies]
 winapi = "^0.2.8"

src/unix.rs

@@ -2,9 +2,12 @@ extern crate nix;
 
 use std::fs::File;
 use std::io;
+use std::io::ErrorKind;
 use std::os::unix::prelude::*;
 use std::process::Stdio;
 
+use sys::nix::Error::Sys;
+
 use PipeReader;
 use PipeWriter;
 use IntoStdio;
@@ -13,7 +16,7 @@ pub fn pipe() -> io::Result<(PipeReader, PipeWriter)> {
     // O_CLOEXEC prevents children from inheriting these pipes. Nix's pipe2() will make a best
     // effort to make that atomic on platforms that support it, to avoid the case where another
     // thread forks right after the pipes are created but before O_CLOEXEC is set.
-    let (read_fd, write_fd) = nix::unistd::pipe2(nix::fcntl::O_CLOEXEC)?;
+    let (read_fd, write_fd) = nix::unistd::pipe2(nix::fcntl::O_CLOEXEC).map_err(nix_err_to_io_err)?;
 
     unsafe {
         Ok((
@@ -42,6 +45,17 @@ fn dup_fd(fd: RawFd) -> io::Result<Stdio> {
     dup_result.map(File::into_stdio)
 }
 
+fn nix_err_to_io_err(err: nix::Error) -> io::Error {
+    match err {
+        Sys(err_no) => {
+            io::Error::from(err_no)
+        }
+        _ => {
+            io::Error::new(ErrorKind::InvalidData, err)
+        }
+    }
+}
+
 impl<T: IntoRawFd> IntoStdio for T {
     fn into_stdio(self) -> Stdio {
         let fd = self.into_raw_fd();