mirror of https://github.com/yshui/picom.git
38 lines
914 B
C
38 lines
914 B
C
// SPDX-License-Identifier: MPL-2.0
|
|
// Copyright (c) 2019 Yuxuan Shui <yshuiv7@gmail.com>
|
|
|
|
#pragma once
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#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;
|
|
}
|