3 rt-thread ARM 1 General 3 30 1 1 ExePath build\iar\Exe ObjPath build\iar\Obj ListPath build\iar\List GEndianMode 0 Input description Automatic choice of formatter, without multibyte support. Output description Automatic choice of formatter, without multibyte support. GOutputBinary 0 OGCoreOrChip 1 GRuntimeLibSelect 0 1 GRuntimeLibSelectSlave 0 1 RTDescription Use the normal configuration of the C/C++ runtime library. No locale interface, C locale, no file descriptor support, no multibytes in printf and scanf, and no hex floats in strtod. OGProductVersion 6.30.6.53380 OGLastSavedByProductVersion 8.22.2.15993 GeneralEnableMisra 0 GeneralMisraVerbose 0 OGChipSelectEditMenu STM32F401RE ST STM32F401RE GenLowLevelInterface 1 GEndianModeBE 1 OGBufferedTerminalOutput 0 GenStdoutInterface 0 GeneralMisraRules98 0 1000111110110101101110011100111111101110011011000101110111101101100111111111111100110011111001110111001111111111111111111111111 GeneralMisraVer 0 GeneralMisraRules04 0 111101110010111111111000110111111111111111111111111110010111101111010101111111111111111111111111101111111011111001111011111011111111111111111 RTConfigPath2 $TOOLKIT_DIR$\INC\c\DLib_Config_Normal.h GBECoreSlave 26 39 OGUseCmsis 0 OGUseCmsisDspLib 0 GRuntimeLibThreads 0 CoreVariant 26 39 GFPUDeviceSlave STM32F401RE ST STM32F401RE FPU2 0 4 NrRegs 0 1 NEON 0 GFPUCoreSlave2 26 39 OGCMSISPackSelectDevice OgLibHeap 0 OGLibAdditionalLocale 0 OGPrintfVariant 0 0 OGPrintfMultibyteSupport 0 OGScanfVariant 0 0 OGScanfMultibyteSupport 0 GenLocaleTags GenLocaleDisplayOnly DSPExtension 1 TrustZone 0 ICCARM 2 34 1 1 CCOptimizationNoSizeConstraints 0 CCDefines CLOCKS_PER_SEC=RT_TICK_PER_SECOND RT_USING_DLIBC RT_USING_LIBC _DLIB_ADD_EXTRA_SYMBOLS=0 STM32F401xE __RTTHREAD__ USE_HAL_DRIVER CCPreprocFile 0 CCPreprocComments 0 CCPreprocLine 0 CCListCFile 0 CCListCMnemonics 0 CCListCMessages 0 CCListAssFile 0 CCListAssSource 0 CCEnableRemarks 0 CCDiagSuppress Pa050 CCDiagRemark CCDiagWarning CCDiagError CCObjPrefix 1 CCAllowList 1 00000000 CCDebugInfo 1 IEndianMode 1 IProcessor 1 IExtraOptionsCheck 0 IExtraOptions CCLangConformance 0 CCSignedPlainChar 1 CCRequirePrototypes 0 CCDiagWarnAreErr 0 CCCompilerRuntimeInfo 0 IFpuProcessor 1 OutputFile $FILE_BNAME$.o CCLibConfigHeader 1 PreInclude CompilerMisraOverride 0 CCIncludePath2 $PROJ_DIR$\..\..\..\components\libc\compilers\common\extension\fcntl\octal $PROJ_DIR$\..\..\..\components\libc\posix\ipc $PROJ_DIR$\..\..\..\components\finsh $PROJ_DIR$\..\..\..\libcpu\arm\common $PROJ_DIR$\..\..\..\libcpu\arm\cortex-m4 $PROJ_DIR$\..\libraries\HAL_Drivers\CMSIS\Include $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Inc $PROJ_DIR$\..\..\..\components\drivers\include $PROJ_DIR$\..\..\..\components\libc\posix\io\stdio $PROJ_DIR$\. $PROJ_DIR$\applications $PROJ_DIR$\..\libraries\HAL_Drivers\config $PROJ_DIR$\..\..\..\components\libc\posix\io\poll $PROJ_DIR$\..\..\..\components\libc\compilers\common\extension $PROJ_DIR$\..\..\..\components\libc\compilers\common\include $PROJ_DIR$\board\CubeMX_Config\Inc $PROJ_DIR$\..\libraries\STM32F4xx_HAL\CMSIS\Device\ST\STM32F4xx\Include $PROJ_DIR$\..\..\..\include $PROJ_DIR$\..\libraries\HAL_Drivers $PROJ_DIR$\board CCStdIncCheck 0 CCCodeSection .text IProcessorMode2 1 CCOptLevel 1 CCOptStrategy 0 0 CCOptLevelSlave 1 CompilerMisraRules98 0 1000111110110101101110011100111111101110011011000101110111101101100111111111111100110011111001110111001111111111111111111111111 CompilerMisraRules04 0 111101110010111111111000110111111111111111111111111110010111101111010101111111111111111111111111101111111011111001111011111011111111111111111 CCPosIndRopi 0 CCPosIndRwpi 0 CCPosIndNoDynInit 0 IccLang 0 IccCDialect 1 IccAllowVLA 0 IccStaticDestr 1 IccCppInlineSemantics 0 IccCmsis 1 IccFloatSemantics 0 CCNoLiteralPool 0 CCOptStrategySlave 0 0 CCGuardCalls 1 CCEncSource 0 CCEncOutput 0 CCEncOutputBom 1 CCEncInput 0 IccExceptions2 0 IccRTTI2 0 AARM 2 10 1 1 AObjPrefix 1 AEndian 1 ACaseSensitivity 1 MacroChars 0 0 AWarnEnable 0 AWarnWhat 0 AWarnOne AWarnRange1 AWarnRange2 ADebug 1 AltRegisterNames 0 ADefines AList 0 AListHeader 1 AListing 1 Includes 0 MacDefs 0 MacExps 1 MacExec 0 OnlyAssed 0 MultiLine 0 PageLengthCheck 0 PageLength 80 TabSpacing 8 AXRef 0 AXRefDefines 0 AXRefInternal 0 AXRefDual 0 AProcessor 1 AFpuProcessor 1 AOutputFile $FILE_BNAME$.o ALimitErrorsCheck 0 ALimitErrorsEdit 100 AIgnoreStdInclude 0 AUserIncludes AExtraOptionsCheckV2 0 AExtraOptionsV2 AsmNoLiteralPool 0 OBJCOPY 0 1 1 1 OOCOutputFormat 3 3 OCOutputOverride 1 OOCOutputFile ../../../rtthread.bin OOCCommandLineProducer 1 OOCObjCopyEnable 1 CUSTOM 3 0 BICOMP 0 BUILDACTION 1 ILINK 0 20 1 1 IlinkLibIOConfig 1 XLinkMisraHandler 0 IlinkInputFileSlave 0 IlinkOutputFile rtthread.out IlinkDebugInfoEnable 1 IlinkKeepSymbols IlinkRawBinaryFile IlinkRawBinarySymbol IlinkRawBinarySegment IlinkRawBinaryAlign IlinkDefines IlinkConfigDefines IlinkMapFile 0 IlinkLogFile 0 IlinkLogInitialization 0 IlinkLogModule 0 IlinkLogSection 0 IlinkLogVeneer 0 IlinkIcfOverride 1 IlinkIcfFile $PROJ_DIR$\board\linker_scripts\link.icf IlinkIcfFileSlave IlinkEnableRemarks 0 IlinkSuppressDiags IlinkTreatAsRem IlinkTreatAsWarn IlinkTreatAsErr IlinkWarningsAreErrors 0 IlinkUseExtraOptions 0 IlinkExtraOptions IlinkLowLevelInterfaceSlave 1 IlinkAutoLibEnable 1 IlinkAdditionalLibs IlinkOverrideProgramEntryLabel 0 IlinkProgramEntryLabelSelect 0 IlinkProgramEntryLabel __iar_program_start DoFill 0 FillerByte 0xFF FillerStart 0x0 FillerEnd 0x0 CrcSize 0 1 CrcAlign 1 CrcPoly 0x11021 CrcCompl 0 0 CrcBitOrder 0 0 CrcInitialValue 0x0 DoCrc 0 IlinkBE8Slave 1 IlinkBufferedTerminalOutput 1 IlinkStdoutInterfaceSlave 1 CrcFullSize 0 IlinkIElfToolPostProcess 0 IlinkLogAutoLibSelect 0 IlinkLogRedirSymbols 0 IlinkLogUnusedFragments 0 IlinkCrcReverseByteOrder 0 IlinkCrcUseAsInput 1 IlinkOptInline 0 IlinkOptExceptionsAllow 1 IlinkOptExceptionsForce 0 IlinkCmsis 1 IlinkOptMergeDuplSections 0 IlinkOptUseVfe 1 IlinkOptForceVfe 0 IlinkStackAnalysisEnable 0 IlinkStackControlFile IlinkStackCallGraphFile CrcAlgorithm 1 1 CrcUnitSize 0 0 IlinkThreadsSlave 1 IlinkLogCallGraph 0 IlinkIcfFile_AltDefault IlinkEncInput 0 IlinkEncOutput 0 IlinkEncOutputBom 1 IlinkHeapSelect 1 IlinkLocaleSelect 1 IARCHIVE 0 0 1 1 IarchiveInputs IarchiveOverride 0 IarchiveOutput ###Unitialized### BILINK 0 Release ARM 0 General 3 30 1 0 ExePath Release\Exe ObjPath Release\Obj ListPath Release\List GEndianMode 0 Input description Output description GOutputBinary 0 OGCoreOrChip 0 GRuntimeLibSelect 0 1 GRuntimeLibSelectSlave 0 1 RTDescription OGProductVersion 6.30.6.53380 OGLastSavedByProductVersion 8.11.3.13977 GeneralEnableMisra 0 GeneralMisraVerbose 0 OGChipSelectEditMenu Default None GenLowLevelInterface 0 GEndianModeBE 0 OGBufferedTerminalOutput 0 GenStdoutInterface 0 GeneralMisraRules98 0 1000111110110101101110011100111111101110011011000101110111101101100111111111111100110011111001110111001111111111111111111111111 GeneralMisraVer 0 GeneralMisraRules04 0 111101110010111111111000110111111111111111111111111110010111101111010101111111111111111111111111101111111011111001111011111011111111111111111 RTConfigPath2 GBECoreSlave 26 1 OGUseCmsis 0 OGUseCmsisDspLib 0 GRuntimeLibThreads 0 CoreVariant 26 0 GFPUDeviceSlave Default None FPU2 0 0 NrRegs 0 0 NEON 0 GFPUCoreSlave2 26 0 OGCMSISPackSelectDevice OgLibHeap 0 OGLibAdditionalLocale 0 OGPrintfVariant 0 0 OGPrintfMultibyteSupport 0 OGScanfVariant 0 0 OGScanfMultibyteSupport 0 GenLocaleTags GenLocaleDisplayOnly DSPExtension 0 TrustZone 0 ICCARM 2 34 1 0 CCOptimizationNoSizeConstraints 0 CCDefines CLOCKS_PER_SEC=RT_TICK_PER_SECOND RT_USING_DLIBC RT_USING_LIBC _DLIB_ADD_EXTRA_SYMBOLS=0 STM32F401xE __RTTHREAD__ USE_HAL_DRIVER CCPreprocFile 0 CCPreprocComments 0 CCPreprocLine 0 CCListCFile 0 CCListCMnemonics 0 CCListCMessages 0 CCListAssFile 0 CCListAssSource 0 CCEnableRemarks 0 CCDiagSuppress CCDiagRemark CCDiagWarning CCDiagError CCObjPrefix 1 CCAllowList 1 11111110 CCDebugInfo 0 IEndianMode 1 IProcessor 1 IExtraOptionsCheck 0 IExtraOptions CCLangConformance 0 CCSignedPlainChar 1 CCRequirePrototypes 0 CCDiagWarnAreErr 0 CCCompilerRuntimeInfo 0 IFpuProcessor 1 OutputFile CCLibConfigHeader 1 PreInclude CompilerMisraOverride 0 CCIncludePath2 $PROJ_DIR$\..\..\..\components\libc\compilers\common\extension\fcntl\octal $PROJ_DIR$\..\..\..\components\libc\posix\ipc $PROJ_DIR$\..\..\..\components\finsh $PROJ_DIR$\..\..\..\libcpu\arm\common $PROJ_DIR$\..\..\..\libcpu\arm\cortex-m4 $PROJ_DIR$\..\libraries\HAL_Drivers\CMSIS\Include $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Inc $PROJ_DIR$\..\..\..\components\drivers\include $PROJ_DIR$\..\..\..\components\libc\posix\io\stdio $PROJ_DIR$\. $PROJ_DIR$\applications $PROJ_DIR$\..\libraries\HAL_Drivers\config $PROJ_DIR$\..\..\..\components\libc\posix\io\poll $PROJ_DIR$\..\..\..\components\libc\compilers\common\extension $PROJ_DIR$\..\..\..\components\libc\compilers\common\include $PROJ_DIR$\board\CubeMX_Config\Inc $PROJ_DIR$\..\libraries\STM32F4xx_HAL\CMSIS\Device\ST\STM32F4xx\Include $PROJ_DIR$\..\..\..\include $PROJ_DIR$\..\libraries\HAL_Drivers $PROJ_DIR$\board CCStdIncCheck 0 CCCodeSection .text IProcessorMode2 1 CCOptLevel 3 CCOptStrategy 0 0 CCOptLevelSlave 1 CompilerMisraRules98 0 1000111110110101101110011100111111101110011011000101110111101101100111111111111100110011111001110111001111111111111111111111111 CompilerMisraRules04 0 111101110010111111111000110111111111111111111111111110010111101111010101111111111111111111111111101111111011111001111011111011111111111111111 CCPosIndRopi 0 CCPosIndRwpi 0 CCPosIndNoDynInit 0 IccLang 0 IccCDialect 1 IccAllowVLA 0 IccStaticDestr 1 IccCppInlineSemantics 0 IccCmsis 1 IccFloatSemantics 0 CCNoLiteralPool 0 CCOptStrategySlave 0 0 CCGuardCalls 1 CCEncSource 0 CCEncOutput 0 CCEncOutputBom 1 CCEncInput 0 IccExceptions2 0 IccRTTI2 0 AARM 2 10 1 0 AObjPrefix 1 AEndian 1 ACaseSensitivity 1 MacroChars 0 0 AWarnEnable 0 AWarnWhat 0 AWarnOne AWarnRange1 AWarnRange2 ADebug 0 AltRegisterNames 0 ADefines AList 0 AListHeader 1 AListing 1 Includes 0 MacDefs 0 MacExps 1 MacExec 0 OnlyAssed 0 MultiLine 0 PageLengthCheck 0 PageLength 80 TabSpacing 8 AXRef 0 AXRefDefines 0 AXRefInternal 0 AXRefDual 0 AProcessor 1 AFpuProcessor 1 AOutputFile ALimitErrorsCheck 0 ALimitErrorsEdit 100 AIgnoreStdInclude 0 AUserIncludes AExtraOptionsCheckV2 0 AExtraOptionsV2 AsmNoLiteralPool 0 OBJCOPY 0 1 1 0 OOCOutputFormat 3 0 OCOutputOverride 0 OOCOutputFile OOCCommandLineProducer 1 OOCObjCopyEnable 0 CUSTOM 3 0 BICOMP 0 BUILDACTION 1 ILINK 0 20 1 0 IlinkLibIOConfig 1 XLinkMisraHandler 0 IlinkInputFileSlave 0 IlinkOutputFile ###Unitialized### IlinkDebugInfoEnable 1 IlinkKeepSymbols IlinkRawBinaryFile IlinkRawBinarySymbol IlinkRawBinarySegment IlinkRawBinaryAlign IlinkDefines IlinkConfigDefines IlinkMapFile 0 IlinkLogFile 0 IlinkLogInitialization 0 IlinkLogModule 0 IlinkLogSection 0 IlinkLogVeneer 0 IlinkIcfOverride 0 IlinkIcfFile lnk0t.icf IlinkIcfFileSlave IlinkEnableRemarks 0 IlinkSuppressDiags IlinkTreatAsRem IlinkTreatAsWarn IlinkTreatAsErr IlinkWarningsAreErrors 0 IlinkUseExtraOptions 0 IlinkExtraOptions IlinkLowLevelInterfaceSlave 1 IlinkAutoLibEnable 1 IlinkAdditionalLibs IlinkOverrideProgramEntryLabel 0 IlinkProgramEntryLabelSelect 0 IlinkProgramEntryLabel DoFill 0 FillerByte 0xFF FillerStart 0x0 FillerEnd 0x0 CrcSize 0 1 CrcAlign 1 CrcPoly 0x11021 CrcCompl 0 0 CrcBitOrder 0 0 CrcInitialValue 0x0 DoCrc 0 IlinkBE8Slave 1 IlinkBufferedTerminalOutput 1 IlinkStdoutInterfaceSlave 1 CrcFullSize 0 IlinkIElfToolPostProcess 0 IlinkLogAutoLibSelect 0 IlinkLogRedirSymbols 0 IlinkLogUnusedFragments 0 IlinkCrcReverseByteOrder 0 IlinkCrcUseAsInput 1 IlinkOptInline 1 IlinkOptExceptionsAllow 1 IlinkOptExceptionsForce 0 IlinkCmsis 1 IlinkOptMergeDuplSections 0 IlinkOptUseVfe 1 IlinkOptForceVfe 0 IlinkStackAnalysisEnable 0 IlinkStackControlFile IlinkStackCallGraphFile CrcAlgorithm 1 1 CrcUnitSize 0 0 IlinkThreadsSlave 1 IlinkLogCallGraph 0 IlinkIcfFile_AltDefault IlinkEncInput 0 IlinkEncOutput 0 IlinkEncOutputBom 1 IlinkHeapSelect 1 IlinkLocaleSelect 1 IARCHIVE 0 0 1 0 IarchiveInputs IarchiveOverride 0 IarchiveOutput ###Unitialized### BILINK 0 Applications $PROJ_DIR$\applications\main.c Compiler $PROJ_DIR$\..\..\..\components\libc\compilers\common\cctype.c $PROJ_DIR$\..\..\..\components\libc\compilers\common\cstdio.c $PROJ_DIR$\..\..\..\components\libc\compilers\common\cstdlib.c $PROJ_DIR$\..\..\..\components\libc\compilers\common\cstring.c $PROJ_DIR$\..\..\..\components\libc\compilers\common\ctime.c $PROJ_DIR$\..\..\..\components\libc\compilers\common\cwchar.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\environ.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscall_close.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscall_lseek.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscall_mem.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscall_open.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscall_read.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscall_remove.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscall_write.c $PROJ_DIR$\..\..\..\components\libc\compilers\dlib\syscalls.c CPU $PROJ_DIR$\..\..\..\libcpu\arm\common\backtrace.c $PROJ_DIR$\..\..\..\libcpu\arm\common\div0.c $PROJ_DIR$\..\..\..\libcpu\arm\common\showmem.c $PROJ_DIR$\..\..\..\libcpu\arm\cortex-m4\context_iar.S $PROJ_DIR$\..\..\..\libcpu\arm\cortex-m4\cpuport.c DeviceDrivers $PROJ_DIR$\..\..\..\components\drivers\ipc\completion.c $PROJ_DIR$\..\..\..\components\drivers\ipc\dataqueue.c $PROJ_DIR$\..\..\..\components\drivers\ipc\pipe.c $PROJ_DIR$\..\..\..\components\drivers\ipc\ringblk_buf.c $PROJ_DIR$\..\..\..\components\drivers\ipc\ringbuffer.c $PROJ_DIR$\..\..\..\components\drivers\ipc\waitqueue.c $PROJ_DIR$\..\..\..\components\drivers\ipc\workqueue.c $PROJ_DIR$\..\..\..\components\drivers\misc\pin.c $PROJ_DIR$\..\..\..\components\drivers\serial\serial.c Drivers $PROJ_DIR$\..\libraries\STM32F4xx_HAL\CMSIS\Device\ST\STM32F4xx\Source\Templates\iar\startup_stm32f401xe.s $PROJ_DIR$\board\CubeMX_Config\Src\stm32f4xx_hal_msp.c $PROJ_DIR$\board\board.c $PROJ_DIR$\..\libraries\HAL_Drivers\drv_common.c $PROJ_DIR$\..\libraries\HAL_Drivers\drv_gpio.c $PROJ_DIR$\..\libraries\HAL_Drivers\drv_usart.c Finsh $PROJ_DIR$\..\..\..\components\finsh\shell.c $PROJ_DIR$\..\..\..\components\finsh\msh.c $PROJ_DIR$\..\..\..\components\finsh\msh_parse.c $PROJ_DIR$\..\..\..\components\finsh\cmd.c Kernel $PROJ_DIR$\..\..\..\src\clock.c $PROJ_DIR$\..\..\..\src\components.c $PROJ_DIR$\..\..\..\src\device.c $PROJ_DIR$\..\..\..\src\idle.c $PROJ_DIR$\..\..\..\src\ipc.c $PROJ_DIR$\..\..\..\src\irq.c $PROJ_DIR$\..\..\..\src\kservice.c $PROJ_DIR$\..\..\..\src\mem.c $PROJ_DIR$\..\..\..\src\mempool.c $PROJ_DIR$\..\..\..\src\object.c $PROJ_DIR$\..\..\..\src\scheduler.c $PROJ_DIR$\..\..\..\src\thread.c $PROJ_DIR$\..\..\..\src\timer.c Libraries $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_uart.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_cryp_ex.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_pwr_ex.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_rng.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_dma.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_rcc_ex.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_usart.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_cec.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_rcc.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_dma_ex.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_pwr.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\CMSIS\Device\ST\STM32F4xx\Source\Templates\system_stm32f4xx.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_crc.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_cortex.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_cryp.c $PROJ_DIR$\..\libraries\STM32F4xx_HAL\STM32F4xx_HAL_Driver\Src\stm32f4xx_hal_gpio.c POSIX