1 files changed, 45 insertions, 0 deletions
diff --git a/src/util.rs b/src/util.rs
new file mode 100644
index 0000000..c18a263
--- /dev/null
+++ b/src/util.rs
@@ -0,0 +1,45 @@
+use std::{
+	io::{Error, ErrorKind, Result},
+	process::ExitStatus,
+};
+
+use nix::sys::wait;
+
+pub trait ToIOResult<T> {
+	fn to_io_result(self) -> Result<T>;
+}
+
+impl<T> ToIOResult<T> for nix::Result<T> {
+	fn to_io_result(self) -> Result<T> {
+		self.map_err(|error| Error::new(ErrorKind::Other, error))
+	}
+}
+
+pub trait Checkable {
+	fn check(&self) -> Result<()>;
+}
+
+impl Checkable for ExitStatus {
+	fn check(&self) -> Result<()> {
+		if self.success() {
+			Ok(())
+		} else {
+			Err(Error::new(
+				ErrorKind::Other,
+				format!("process exited with status {}", self),
+			))
+		}
+	}
+}
+
+impl Checkable for wait::WaitStatus {
+	fn check(&self) -> Result<()> {
+		match self {
+			wait::WaitStatus::Exited(_, 0) => Ok(()),
+			_ => Err(Error::new(
+				ErrorKind::Other,
+				format!("process exited with status {:?}", self),
+			)),
+		}
+	}
+}