Add 'linux-command/' from commit '3902ba06096a96f88be478d3bbc261380e6…

…a3c48'

git-subtree-dir: linux-command
git-subtree-mainline: 95b791c
git-subtree-split: 3902ba0

linux-command/.gitignore

@@ -0,0 +1,62 @@
+# Execute files
+mytop
+mylscpu
+myps
+
+# Temporary files
+.dependency
+*.sh
+*.txt
+
+# Prerequisites
+*.d
+
+# Object files
+*.o
+*.ko
+*.obj
+*.elf
+
+# Linker output
+*.ilk
+*.map
+*.exp
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Libraries
+*.lib
+*.a
+*.la
+*.lo
+
+# Shared objects (inc. Windows DLLs)
+*.dll
+*.so
+*.so.*
+*.dylib
+
+# Executables
+*.exe
+*.out
+*.app
+*.i*86
+*.x86_64
+*.hex
+
+# Debug files
+*.dSYM/
+*.su
+*.idb
+*.pdb
+
+# Kernel Module Compile Results
+*.mod*
+*.cmd
+.tmp_versions/
+modules.order
+Module.symvers
+Mkfile.old
+dkms.conf

linux-command/Makefile

@@ -0,0 +1,69 @@
+.SUFFIXES: .c .o
+.PHONY: dep all new clean
+
+# Compiler
+CC = gcc
+# Compile option
+# -c: Generate object file
+# -W, -Wall: Print warning about all ambigous grammer 
+# -Wextra: Print warning out of -W, -Wall
+# -O2: Optimization
+# -g: Debugging, PLEASE DELETE AFTER PROJECT COMPLETE!
+CFLAGS = -c -W -Wall -Wextra -g $(INC)
+
+# Execute program file
+MYTOP = mytop
+MYPS = myps
+MYLSCPU = mylscpu
+# Source file
+COMMON_SRCS = common.c
+MYTOP_SRCS = mytop.c
+MYPS_SRCS = myps.c
+MYLSCPU_SRCS = mylscpu.c
+SRCS = $(COMMON_SRCS) $(MYTOP_SRCS) $(MYPS_SRCS) $(MYLSCPU_SRCS) 
+# Object file
+COMMON_OBJS = $(COMMON_SRCS:.c=.o)
+MYTOP_OBJS = $(MYTOP_SRCS:.c=.o)
+MYPS_OBJS = $(MYPS_SRCS:.c=.o)
+MYLSCPU_OBJS = $(MYLSCPU_SRCS:.c=.o)
+OBJS = $(MYTOP_OBJS) $(MYLSCPU_OBJS) $(MYPS_OBJS)
+# Library file
+LIBS = -lncurses
+# Include path
+INC =
+
+# Execute file grneration
+# $@ = TARGET
+# $^ = DEPENDENCY
+# make all: Make all execute file
+all : $(OBJS)
+	$(CC) -o $(MYTOP) $(MYTOP_OBJS) $(LIBS)
+	$(CC) -o $(MYPS) $(MYPS_OBJS) $(LIBS)
+	$(CC) -o $(MYLSCPU) $(MYLSCPU_OBJS) $(LIBS)
+$(MYTOP) : $(MYTOP_OBJS)
+	$(CC) -o $@ $^ $(LIBS)
+$(MYPS) : $(MYPS_OBJS)
+	$(CC) -o $@ $^ $(LIBS)
+$(MYLSCPU) : $(MYLSCPU_OBJS)
+	$(CC) -o $@ $^ $(LIBS)
+
+# Object file generation
+$(MYTOP_OBJS): 
+	$(CC) $(CFLAGS) $(MYTOP_SRCS)
+$(MYPS_OBJS): 
+	$(CC) $(CFLAGS) $(MYPS_SRCS)
+$(MYLSCPU_OBJS): 
+	$(CC) $(CFLAGS) $(MYLSCPU_SRCS)
+
+# make dep: Make dependency information file
+dep:
+	$(CC) -M $(INC) $(SRCS) > .dependency
+
+# make new: Re-generation 
+new:
+	$(MAKE) clean
+	$(MAKE) all
+
+# make clean: Remove all generated file
+clean:
+	rm *.o $(MYTOP) $(MYPS) $(MYLSCPU)

linux-command/README.md

@@ -0,0 +1,53 @@
+# Linux Command
+
+리눅스 명령어인 top, ps, lscpu 명령어 구현
+
+## 0. Quick start
+
+``` bash
+$ git clone https://github.com/codejune/c-linux-command.git
+$ cd c-linux-command
+
+# 일괄 빌드
+$ make
+
+# 개별 빌드
+$ make mytop
+$ ./mytop
+```
+
+## 1. Environment
+
+### Software
+
+- Ubuntu 20.04.3 LTS (x86_64)
+- Linux Kernel 5.11.22
+
+### Hardware
+
+- VM Instance
+- 4 Core 8 Thread
+- 8 GB RAM
+- 60 GB Storage
+
+## 2. Requirement
+
+### 조건
+
+- system() or exec() 계열 함수를 사용하여 해당 명령어를 호출 금지
+- mytop, myps 명령어는 리눅스 top, ps 명령어와 최대한 유사한 결과를 출력하게 구현
+- mylscpu 명령어의 경우 필수 구현 항목은 CPU Vendor ID, CPU 모델명, CPU 속도, 캐쉬 크기(L1i, L1d, L2 캐쉬) 이며 그 외의 항목은 추가 option으로 취급
+
+### 출력
+
+- mytop
+
+    ![mytop](./assets/mytop.png)
+
+- myps
+
+    ![myps](./assets/myps.png)
+
+- mylscpu
+
+    ![mylscpu](./assets/mylscpu.png)