From 0147e7dd165f837662a480938e2083a5ac707586 Mon Sep 17 00:00:00 2001 From: Allusive_ <99632976+allusive-dev@users.noreply.github.com> Date: Tue, 1 Aug 2023 09:00:18 +1000 Subject: Add files via upload --- src/err.h | 37 +++++++++++++++++++++++++++++++++++++ 1 file changed, 37 insertions(+) create mode 100644 src/err.h (limited to 'src/err.h') diff --git a/src/err.h b/src/err.h new file mode 100644 index 0000000..f989bf9 --- /dev/null +++ b/src/err.h @@ -0,0 +1,37 @@ +// SPDX-License-Identifier: MPL-2.0 +// Copyright (c) 2019 Yuxuan Shui + +#pragma once +#include +#include +#include "compiler.h" + +// Functions for error reporting, adopted from Linux + +// INFO in user space we can probably be more liberal about what pointer we consider +// error. e.g. In x86_64 Linux, all addresses with the highest bit set is invalid in user +// space. +#define MAX_ERRNO 4095 + +static inline void *must_use ERR_PTR(intptr_t err) { + return (void *)err; +} + +static inline intptr_t must_use PTR_ERR(void *ptr) { + return (intptr_t)ptr; +} + +static inline bool must_use IS_ERR(void *ptr) { + return unlikely((uintptr_t)ptr > (uintptr_t)-MAX_ERRNO); +} + +static inline bool must_use IS_ERR_OR_NULL(void *ptr) { + return unlikely(!ptr) || IS_ERR(ptr); +} + +static inline intptr_t must_use PTR_ERR_OR_ZERO(void *ptr) { + if (IS_ERR(ptr)) { + return PTR_ERR(ptr); + } + return 0; +} -- cgit v1.2.3