first commit

.clang-format

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+---
+BasedOnStyle: Google
+---
+Language:        Cpp
+# AccessModifierOffset: -1
+# AlignAfterOpenBracket: Align
+# AlignConsecutiveMacros: false
+# AlignConsecutiveAssignments: false
+# AlignConsecutiveDeclarations: false
+# AlignEscapedNewlines: Left
+# AlignOperands:   true
+# AlignTrailingComments: true
+# AllowAllArgumentsOnNextLine: true
+# AllowAllConstructorInitializersOnNextLine: true
+# AllowAllParametersOfDeclarationOnNextLine: true
+# AllowShortBlocksOnASingleLine: Never
+# AllowShortCaseLabelsOnASingleLine: false
+# AllowShortFunctionsOnASingleLine: All
+# AllowShortLambdasOnASingleLine: All
+# AllowShortIfStatementsOnASingleLine: WithoutElse
+# AllowShortLoopsOnASingleLine: true
+# AlwaysBreakAfterDefinitionReturnType: None
+# AlwaysBreakAfterReturnType: None
+# AlwaysBreakBeforeMultilineStrings: true
+# AlwaysBreakTemplateDeclarations: Yes
+# BinPackArguments: true
+# BinPackParameters: true
+# BraceWrapping:
+#   AfterCaseLabel:  false
+#   AfterClass:      false
+#   AfterControlStatement: false
+#   AfterEnum:       false
+#   AfterFunction:   false
+#   AfterNamespace:  false
+#   AfterObjCDeclaration: false
+#   AfterStruct:     false
+#   AfterUnion:      false
+#   AfterExternBlock: false
+#   BeforeCatch:     false
+#   BeforeElse:      false
+#   IndentBraces:    false
+#   SplitEmptyFunction: true
+#   SplitEmptyRecord: true
+#   SplitEmptyNamespace: true
+# BreakBeforeBinaryOperators: None
+# BreakBeforeBraces: Attach
+# BreakBeforeInheritanceComma: false
+# BreakInheritanceList: BeforeColon
+# BreakBeforeTernaryOperators: true
+# BreakConstructorInitializersBeforeComma: false
+# BreakConstructorInitializers: BeforeColon
+# BreakAfterJavaFieldAnnotations: false
+# BreakStringLiterals: true
+# ColumnLimit:     80
+# CommentPragmas:  '^ IWYU pragma:'
+# CompactNamespaces: false
+# ConstructorInitializerAllOnOneLineOrOnePerLine: true
+# ConstructorInitializerIndentWidth: 4
+# ContinuationIndentWidth: 4
+# Cpp11BracedListStyle: true
+# DeriveLineEnding: true
+# DerivePointerAlignment: true
+# DisableFormat:   false
+# ExperimentalAutoDetectBinPacking: false
+# FixNamespaceComments: true
+# ForEachMacros:
+#   - foreach
+#   - Q_FOREACH
+#   - BOOST_FOREACH
+# IncludeBlocks:   Regroup
+# IncludeCategories:
+#   - Regex:           '^<ext/.*\.h>'
+#     Priority:        2
+#     SortPriority:    0
+#   - Regex:           '^<.*\.h>'
+#     Priority:        1
+#     SortPriority:    0
+#   - Regex:           '^<.*'
+#     Priority:        2
+#     SortPriority:    0
+#   - Regex:           '.*'
+#     Priority:        3
+#     SortPriority:    0
+# IncludeIsMainRegex: '([-_](test|unittest))?$'
+# IncludeIsMainSourceRegex: ''
+# IndentCaseLabels: true
+# IndentGotoLabels: true
+# IndentPPDirectives: None
+IndentWidth:     4
+# IndentWrappedFunctionNames: false
+# JavaScriptQuotes: Leave
+# JavaScriptWrapImports: true
+# KeepEmptyLinesAtTheStartOfBlocks: false
+# MacroBlockBegin: ''
+# MacroBlockEnd:   ''
+# MaxEmptyLinesToKeep: 1
+# NamespaceIndentation: None
+# ObjCBinPackProtocolList: Never
+# ObjCBlockIndentWidth: 2
+# ObjCSpaceAfterProperty: false
+# ObjCSpaceBeforeProtocolList: true
+# PenaltyBreakAssignment: 2
+# PenaltyBreakBeforeFirstCallParameter: 1
+# PenaltyBreakComment: 300
+# PenaltyBreakFirstLessLess: 120
+# PenaltyBreakString: 1000
+# PenaltyBreakTemplateDeclaration: 10
+# PenaltyExcessCharacter: 1000000
+# PenaltyReturnTypeOnItsOwnLine: 200
+# PointerAlignment: Left
+# RawStringFormats:
+#   - Language:        Cpp
+#     Delimiters:
+#       - cc
+#       - CC
+#       - cpp
+#       - Cpp
+#       - CPP
+#       - 'c++'
+#       - 'C++'
+#     CanonicalDelimiter: ''
+#     BasedOnStyle:    google
+#   - Language:        TextProto
+#     Delimiters:
+#       - pb
+#       - PB
+#       - proto
+#       - PROTO
+#     EnclosingFunctions:
+#       - EqualsProto
+#       - EquivToProto
+#       - PARSE_PARTIAL_TEXT_PROTO
+#       - PARSE_TEST_PROTO
+#       - PARSE_TEXT_PROTO
+#       - ParseTextOrDie
+#       - ParseTextProtoOrDie
+#     CanonicalDelimiter: ''
+#     BasedOnStyle:    google
+ReflowComments:  false
+# SortIncludes:    true
+# SortUsingDeclarations: true
+# SpaceAfterCStyleCast: false
+# SpaceAfterLogicalNot: false
+# SpaceAfterTemplateKeyword: true
+# SpaceBeforeAssignmentOperators: true
+# SpaceBeforeCpp11BracedList: false
+# SpaceBeforeCtorInitializerColon: true
+# SpaceBeforeInheritanceColon: true
+# SpaceBeforeParens: ControlStatements
+# SpaceBeforeRangeBasedForLoopColon: true
+# SpaceInEmptyBlock: false
+# SpaceInEmptyParentheses: false
+# SpacesBeforeTrailingComments: 2
+# SpacesInAngles:  false
+# SpacesInConditionalStatement: false
+# SpacesInContainerLiterals: true
+# SpacesInCStyleCastParentheses: false
+# SpacesInParentheses: false
+# SpacesInSquareBrackets: false
+# SpaceBeforeSquareBrackets: false
+# Standard:        Auto
+# StatementMacros:
+#   - Q_UNUSED
+#   - QT_REQUIRE_VERSION
+TabWidth:        4
+# UseCRLF:         false
+# UseTab:          Never
+...

.gitignore

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+.cache
+compile_commands.json

Makefile

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+obj-m	:= scull.o
+
+scull-objs := src/main.o src/pipe.o
+
+CFLAGS=-Wall -std=c11
+
+modules:
+	make -j $(nproc) -C /lib/modules/$(shell uname -r)/build M=$(PWD) modules
+
+load:
+	scripts/load.sh
+
+remove:
+	scripts/remove.sh
+
+test:
+	scripts/test.sh
+
+install: clean modules remove load
+	@scripts/test.sh \
+	&& echo "\nScull installation successful!\n" \
+	|| echo "\nScull installation failed!\n"
+
+clean:
+	make -j $(nproc) -C /lib/modules/$(shell uname -r)/build M=$(PWD) clean
+	make -C test clean
+
+.PHONY: modules load remove test install clean

scripts/load.sh

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+#!/bin/bash
+
+module="scull"
+device="scull"
+
+set -e
+
+# 检查模块是否加载
+lsmod | grep -q scull && exit 1
+
+# 加载模块
+sudo /sbin/insmod ./$module.ko $* || exit 1
+
+# 获取主编号
+major=$(awk "\$2==\"$module\" {print \$1}" /proc/devices)
+
+# 创建scull
+sudo rm -f /dev/${device}[0-3]
+sudo mknod /dev/${device}0 c $major 0
+sudo mknod /dev/${device}1 c $major 1
+sudo mknod /dev/${device}2 c $major 2
+sudo mknod /dev/${device}3 c $major 3
+
+# 修改所有者
+sudo -E chown $USER:$USER /dev/${device}[0-3]
+
+# 创建scull pipe
+sudo rm -f /dev/${device}pipe[0-3]
+sudo mknod /dev/${device}pipe0 c $major 4
+sudo mknod /dev/${device}pipe1 c $major 5
+sudo mknod /dev/${device}pipe2 c $major 6
+sudo mknod /dev/${device}pipe3 c $major 7
+
+sudo -E chown $USER:$USER /dev/${device}pipe[0-3]
+
+
+

scripts/remove.sh

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+#!/bin/bash
+
+module="scull"
+device="scull"
+
+lsmod | grep -q $module || exit 0
+
+sudo /sbin/rmmod $module $* || exit 1
+
+sudo rm -f /dev/${device} /dev/${device}[0-3] 
+
+sudo rm -f /dev/${device} /dev/${device}pipe[0-3] 
+
+
+
+
+

scripts/test.sh

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+#!/bin/bash
+set -x
+make -j $(nproc) -C test all
+cd test/build && sudo ./run_tests