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155 lines
4.4 KiB
C
155 lines
4.4 KiB
C
// SPDX-License-Identifier: LGPL-3.0-or-later
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/**
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* \file sys/sys.h
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*
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* Miscellaneous system functionality.
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*
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* \copyright The DoubleFourteen Code Forge (C) All Rights Reserved
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* \author Lorenzo Cogotti
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*/
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#ifndef DF_SYS_ERR_H_
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#define DF_SYS_ERR_H_
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#include "srcloc.h"
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#include <stdarg.h>
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#ifdef _MSC_VER
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// for Sys_WipeMemory()
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#include <intrin.h>
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#pragma intrinsic(_ReadWriteBarrier)
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#endif
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/**
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* \typedef SysRet
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* \brief Platform-specific error code for system operations.
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*/
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typedef int SysRet; // errno type
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/**
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* \brief Error status structure.
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*
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* Stores latest operation result and current error handling callback.
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*/
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typedef struct {
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/// Latest operation result status.
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SysRet code;
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/**
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* \brief Error handler callback.
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*
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* \param [in] code System error code
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* \param [in] reason Human readable concise message providing context to error, never `NULL`
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* \param [in] loc Source location where error occurred, `NULL` if unavailable
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* \param [in] obj User defined additional data forwarded to callback unaltered
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*/
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void (*func)(SysRet code, const char *reason, Srcloc *loc, void *obj);
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/// Additional user data to be forwarded to `func`.
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void *obj;
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} SysErrStat;
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/**
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* \brief Abort error handler callback.
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*
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* This error handler terminates execution abnormally,
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* attempting to log an error message as accurate as possible using system
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* specific facilities.
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*
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* If this handler is registered, execution shall terminate as soon as an
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* exceptional error condition is encountered in the system layer.
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*/
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#define SYS_ERR_ABORT ((void (*)(SysRet, const char *, Srcloc *, void *)) -1)
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/**
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* \brief Ignoring error handler callback.
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*
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* If this handler is registered any system error is ignored.
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*/
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#define SYS_ERR_IGN ((void (*)(SysRet, const char *, Srcloc *, void *)) 0)
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/**
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* \brief Terminating error handler callback.
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*
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* Terminates execution providing sensible error message, it differs
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* from `SYS_ERR_ABORT` in that no exceptional termination semantics is
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* implied, but rather an unsuccessful event that caused immediate exit
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* (no core dump or stack traces are left behind).
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*/
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#define SYS_ERR_QUIT ((void (*)(SysRet, const char *, Srcloc *, void *)) 1)
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/**
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* \brief Install a system error handler callback.
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*
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* Initially installed handler is `SYS_ERR_IGN`,
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* thus any error is effectively ignored unless a new handler is installed.
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*
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* Once installed, the error callback is called immediately for every
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* exceptional error condition encountered inside system layer.
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*
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* Error handlers are thread-local, thus different threads may implement
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* appropriate error handling policy without interfering with each other.
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*
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* \param [in] func Error handler function
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* \param [in] obj Custom user-provided object passed unaltered upon callback
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*
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* \see `SysErrStat` for callback documentation
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*/
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void Sys_SetErrFunc(void (*func)(SysRet, const char *, Srcloc *, void *), void *obj);
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/**
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* Retrieve the system error status.
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*
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* \param [out] stat Storage for returned error status, may be `NULL`
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*
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* \return Last operation result status.
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*/
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SysRet Sys_GetErrStat(SysErrStat *stat);
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/**
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* Trigger an out of memory error.
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*
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* @note Depending on the current error policy, execution may
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* very well continue after call returns.
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*/
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#define Sys_OutOfMemory() _Sys_OutOfMemory(__FILE__, __func__, __LINE__, 0)
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// NOTE: implementation detail, should always be called through `Sys_OutOfMemory()`.
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NOINLINE void _Sys_OutOfMemory(const char *,
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const char *,
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unsigned long long,
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unsigned);
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/**
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* \brief Zero-out `nbytes` bytes inside `data`, preventing compiler optimization.
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*
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* A compiler might optimize-out `memset()` or similar operations if `data`
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* is never read again.
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* This function ensures such operation is never optimized away, which
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* may be useful to zero-out sensitive data.
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*/
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FORCE_INLINE void Sys_WipeMemory(volatile void *data, size_t nbytes)
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{
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#if defined(_MSC_VER) || defined(__GNUC__)
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EXTERNC void *memset(void *, int, size_t);
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memset((void *) data, 0, nbytes);
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// Compiler fence
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#ifdef _MSC_VER
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_ReadWriteBarrier();
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#else
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__asm__ __volatile__ ("" : : : "memory");
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#endif
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#else
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// Slow but portable
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volatile Uint8 *p = (volatile Uint8 *) data;
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while (nbytes--)
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*p++ = 0x00;
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#endif
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}
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/// Sleep *at least* for the specified amount of **milliseconds**.
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void Sys_SleepMillis(Uint32 millis);
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#endif
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