From d512bb4dd234251a836f95224c76d8bea08e085a Mon Sep 17 00:00:00 2001
From: mykola2312 <49044616+mykola2312@users.noreply.github.com>
Date: Fri, 19 Jul 2024 19:31:51 +0300
Subject: [PATCH] begin working on process enumeration, add dummy target and
 adjust makefile for multiple targets

---
 Makefile             | 38 ++++++++++++++++++++++++--------------
 include/process.h    | 15 +++++++++++++++
 src/dummy_target.cpp | 16 ++++++++++++++++
 src/main.cpp         | 12 ++++++++++--
 src/process.cpp      |  6 ++++++
 5 files changed, 71 insertions(+), 16 deletions(-)
 create mode 100644 include/process.h
 create mode 100644 src/dummy_target.cpp
 create mode 100644 src/process.cpp

diff --git a/Makefile b/Makefile
index ca1db35..a920eb1 100644
--- a/Makefile
+++ b/Makefile
@@ -1,17 +1,22 @@
-INC_DIR			=	include
-SRC_DIR			=	src
-OBJ_DIR			=	obj
-BIN_DIR			=	bin
+INC_DIR				=	include
+SRC_DIR				=	src
+OBJ_DIR				=	obj
+BIN_DIR				=	bin
 
-CC				=	g++
-LD				=	ld
-CXXFLAGS		=	-Wall -I$(INC_DIR)
-LDFLAGS			=
+CC					=	g++
+LD					=	ld
+CXXFLAGS			=	-Wall -I$(INC_DIR)
+LDFLAGS				=
 
-BLACKJACK_SRC	=	main.cpp
-BLACKJACK_OBJ	:=	$(addprefix $(OBJ_DIR)/,$(patsubst %.cpp,%.o,$(BLACKJACK_SRC)))
-BLACKJACK_SRC	:=	$(addprefix $(SRC_DIR)/,$(BLACKJACK_SRC))
-BLACKJACK_DEPS	=
+BLACKJACK_SRC		=	main.cpp process.cpp
+BLACKJACK_OBJ		:=	$(addprefix $(OBJ_DIR)/,$(patsubst %.cpp,%.o,$(BLACKJACK_SRC)))
+BLACKJACK_SRC		:=	$(addprefix $(SRC_DIR)/,$(BLACKJACK_SRC))
+BLACKJACK_DEPS		=	process.h
+BLACKJACK_DEPS		:=	$(addprefix $(INC_DIR)/,$(BLACKJACK_DEPS))
+
+DUMMY_TARGET_SRC	=	dummy_target.cpp
+DUMMY_TARGET_OBJ	:=	$(addprefix $(OBJ_DIR)/,$(patsubst %.cpp,%.o,$(DUMMY_TARGET_SRC)))
+DUMMY_TARGET_SRC	:=	$(addprefix $(SRC_DIR)/,$(DUMMY_TARGET_SRC))
 
 $(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp
 	$(CC) $(CXXFLAGS) -c -o $@ $<
@@ -19,13 +24,18 @@ $(OBJ_DIR)/%.o: $(SRC_DIR)/%.cpp
 blackjack: $(BLACKJACK_OBJ) $(BLACKJACK_DEPS)
 	$(CC) $(LDFLAGS) -o $(BIN_DIR)/$@ $(BLACKJACK_OBJ)
 
+dummy_target: $(DUMMY_TARGET_OBJ)
+	$(CC) $(LDFLAGS) -o $(BIN_DIR)/$@ $(DUMMY_TARGET_OBJ)
+
 .PHONY: all clean debug
 
-all: blackjack
+TARGETS				=	blackjack dummy_target
+
+all: $(TARGETS)
 
 debug: CXXFLAGS += -DDEBUG -g
 debug: LDFLAGS += -g
-debug: all
+debug: $(TARGETS)
 
 clean:
 	rm $(OBJ_DIR)/*.o
diff --git a/include/process.h b/include/process.h
new file mode 100644
index 0000000..7524f6d
--- /dev/null
+++ b/include/process.h
@@ -0,0 +1,15 @@
+#pragma once
+
+#include <string>
+#include <optional>
+#include <sys/types.h>
+
+class Process
+{
+public:
+    Process(pid_t pid) : pid(pid) {}
+
+    static std::optional<Process> FindByName(std::string name);
+private:
+    pid_t pid;
+};
\ No newline at end of file
diff --git a/src/dummy_target.cpp b/src/dummy_target.cpp
new file mode 100644
index 0000000..5d95cd6
--- /dev/null
+++ b/src/dummy_target.cpp
@@ -0,0 +1,16 @@
+#include <unistd.h>
+#include <stdio.h>
+
+extern char *program_invocation_name;
+extern char *program_invocation_short_name;
+
+int main()
+{
+    printf("pid: %d\n", getpid());
+    printf("program_invocation_name: %s\n", program_invocation_name);
+    printf("program_invocation_short_name: %s\n", program_invocation_short_name);
+
+    puts("waiting for any key...");
+    getc(stdin);
+    return 0;
+}
\ No newline at end of file
diff --git a/src/main.cpp b/src/main.cpp
index 4c5c742..f2babeb 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,7 +1,15 @@
 #include <iostream>
+#include "process.h"
 
-int main()
+int main(int argc, char** argv)
 {
-    std::cout << "Hello World" << std::endl;
+    auto proc = Process::FindByName("dummy_target");
+    if (proc) proc = proc.value();
+    else 
+    {
+        fputs("process not found\n", stderr);
+        return 1;
+    }
+
     return 0;
 }
\ No newline at end of file
diff --git a/src/process.cpp b/src/process.cpp
new file mode 100644
index 0000000..1a808eb
--- /dev/null
+++ b/src/process.cpp
@@ -0,0 +1,6 @@
+#include "process.h"
+
+std::optional<Process> Process::FindByName(std::string name)
+{
+    return {};
+}