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// Copyright 2020 Amazon.com, Inc. or its affiliates. All Rights Reserved.
// SPDX-License-Identifier: BSD-3-Clause
//! Wrapper for interpreting syscall exit codes.
use std::os::raw::c_int;
/// Wrapper to interpret syscall exit codes and provide a rustacean `io::Result`.
#[derive(Debug)]
pub struct SyscallReturnCode<T: From<i8> + Eq = c_int>(pub T);
impl<T: From<i8> + Eq> SyscallReturnCode<T> {
/// Returns the last OS error if value is -1 or Ok(value) otherwise.
pub fn into_result(self) -> std::io::Result<T> {
if self.0 == T::from(-1) {
Err(std::io::Error::last_os_error())
} else {
Ok(self.0)
}
}
/// Returns the last OS error if value is -1 or Ok(()) otherwise.
pub fn into_empty_result(self) -> std::io::Result<()> {
self.into_result().map(|_| ())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_syscall_ops() {
let mut syscall_code = SyscallReturnCode(1);
match syscall_code.into_result() {
Ok(_value) => (),
_ => unreachable!(),
}
syscall_code = SyscallReturnCode(-1);
assert!(syscall_code.into_result().is_err());
syscall_code = SyscallReturnCode(1);
match syscall_code.into_empty_result() {
Ok(()) => (),
_ => unreachable!(),
}
syscall_code = SyscallReturnCode(-1);
assert!(syscall_code.into_empty_result().is_err());
let mut syscall_code_long = SyscallReturnCode(1i64);
match syscall_code_long.into_result() {
Ok(_value) => (),
_ => unreachable!(),
}
syscall_code_long = SyscallReturnCode(-1i64);
assert!(syscall_code_long.into_result().is_err());
}
}
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