chore: migrate src to solutions

solutions/01_environment/daemon/.vscode/launch.json

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+{
+  // Use IntelliSense to learn about possible attributes.
+  // Hover to view descriptions of existing attributes.
+  // For more information, visit: https://go.microsoft.com/fwlink/?linkid=830387
+  "version": "0.2.0",
+  "configurations": [
+    {
+      "name": "(gdb) Launch",
+      "type": "cppdbg",
+      "request": "launch",
+      "program": "${workspaceFolder}/app",
+      "stopAtEntry": true,
+      "cwd": "${workspaceFolder}",
+      "externalConsole": false,
+      "MIMode": "gdb",
+      "miDebuggerServerAddress": "192.168.53.14:1234",
+      "miDebuggerPath": "/buildroot/output/host/bin/aarch64-linux-gdb"
+    }
+  ]
+}

solutions/01_environment/daemon/.vscode/tasks.json

@@ -0,0 +1,15 @@
+{
+    // See https://go.microsoft.com/fwlink/?LinkId=733558
+    // for the documentation about the tasks.json format
+    "version": "2.0.0",
+    "tasks": [
+        {
+            "label": "gdbserver",
+            "type": "shell",
+            "command": [
+                "ssh -t root@192.168.53.14 '/usr/bin/gdbserver :1234",
+                "${workspaceFolder}/app'"
+            ]
+        }
+    ]
+}

solutions/01_environment/daemon/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.28)
+project(daemon)
+
+include(../../nanopi.cmake)
+add_executable(daemon daemon.c)

solutions/01_environment/daemon/Makefile

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+EXE=app
+SRCS=$(wildcard *.c)
+
+# Include the standard application Makefile for the CSEL1 labs
+include ../appl.mk

solutions/01_environment/daemon/S60appl

@@ -0,0 +1,24 @@
+#!/bin/sh
+#
+# Daemon application
+#
+case "$1" in
+  start)
+  	/usr/local/app_a
+	;;
+  stop)
+  	killall app_a
+	;;
+  restart|reload)
+  	killall app_a
+	/usr/local/app_a
+	;;
+  *)
+	echo $"Usage: $0 {start|stop|restart}"
+	exit 1
+esac
+
+echo "Daemon application launched"
+
+exit $?
+

solutions/01_environment/daemon/daemon.c

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+/**
+ * Copyright 2015 University of Applied Sciences Western Switzerland / Fribourg
+ * 
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ * 
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ * 
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ * 
+ * Module:	MA-CSEL1 - Building Embedded Systems under Linux
+ *
+ * Abstract: 	Introduction to the Embedded Linux Development Environment
+ *
+ * Purpose:	This module implements a simple daemon to be launched
+ *		from a /etc/init.d/S??_* script
+ *
+ * Autĥor:	Daniel Gachet
+ * Date:	28.08.2015
+ */
+#define _XOPEN_SOURCE 600
+#define _DEFAULT_SOURCE
+
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <grp.h>
+#include <pwd.h>
+#include <signal.h>
+#include <syslog.h>
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdint.h>
+
+#define UNUSED(x) (void)(x)
+
+static int signal_catched = 0; 
+
+static void catch_signal (int signal)
+{
+	syslog (LOG_INFO, "signal=%d catched\n", signal);
+	signal_catched++;
+}
+
+static void fork_process()
+{
+	pid_t pid = fork();
+	switch (pid) {
+	case  0: break; 	// child process has been created
+	case -1: syslog (LOG_ERR, "ERROR while forking"); exit (1); break;	
+	default: exit(0);  	// exit parent process with success
+	}
+}
+
+int main(int argc, char* argv[])
+{
+	UNUSED(argc); UNUSED(argv);
+
+	// 1. fork off the parent process
+	fork_process();
+
+	// 2. create new session
+	if (setsid() == -1) {
+		syslog (LOG_ERR, "ERROR while creating new session"); 
+		exit (1);
+	}
+
+	// 3. fork again to get rid of session leading process 
+	fork_process();
+
+	// 4. capture all required signals
+	struct sigaction act = {.sa_handler = catch_signal,};
+	sigaction (SIGHUP,  &act, NULL);  //  1 - hangup
+	sigaction (SIGINT,  &act, NULL);  //  2 - terminal interrupt
+	sigaction (SIGQUIT, &act, NULL);  //  3 - terminal quit
+	sigaction (SIGABRT, &act, NULL);  //  6 - abort
+	sigaction (SIGTERM, &act, NULL);  // 15 - termination
+	sigaction (SIGTSTP, &act, NULL);  // 19 - terminal stop signal
+
+	// 5. update file mode creation mask
+	umask(0027);
+
+	// 6. change working directory to appropriate place
+	if (chdir ("/") == -1) {
+		syslog (LOG_ERR, "ERROR while changing to working directory"); 
+		exit (1);
+	}
+
+	// 7. close all open file descriptors
+	for (int fd = sysconf(_SC_OPEN_MAX); fd >= 0; fd--) {
+		close (fd);
+	}
+
+	// 8. redirect stdin, stdout and stderr to /dev/null
+	if (open ("/dev/null", O_RDWR) != STDIN_FILENO) {
+		syslog (LOG_ERR, "ERROR while opening '/dev/null' for stdin");
+		exit (1);
+	}
+	if (dup2 (STDIN_FILENO, STDOUT_FILENO) != STDOUT_FILENO) {
+		syslog (LOG_ERR, "ERROR while opening '/dev/null' for stdout");
+		exit (1);
+	}
+	if (dup2 (STDIN_FILENO, STDERR_FILENO) != STDERR_FILENO) {
+		syslog (LOG_ERR, "ERROR while opening '/dev/null' for stderr");
+		exit (1);
+	}
+
+	// 9. option: open syslog for message logging
+	openlog (NULL, LOG_NDELAY | LOG_PID, LOG_DAEMON); 
+	syslog (LOG_INFO, "Daemon has started...");
+ 
+	// 10. option: get effective user and group id for appropriate's one
+	struct passwd* pwd = getpwnam ("daemon");
+	if (pwd == 0) {
+		syslog (LOG_ERR, "ERROR while reading daemon password file entry");
+		exit (1);
+	}
+
+	// 11. option: change root directory
+	if (chroot (".") == -1) {
+		syslog (LOG_ERR, "ERROR while changing to new root directory");
+		exit (1);
+	}
+
+	// 12. option: change effective user and group id for appropriate's one
+	if (setegid (pwd->pw_gid) == -1) {
+		syslog (LOG_ERR, "ERROR while setting new effective group id");
+		exit (1);
+	}
+	if (seteuid (pwd->pw_uid) == -1) {
+		syslog (LOG_ERR, "ERROR while setting new effective user id");
+		exit (1);
+	}
+
+	// 13. implement daemon body...
+	int t = 30;
+	do {
+		t = sleep(t);
+	} while (t > 0);
+
+	syslog (LOG_INFO, "daemon stopped. Number of signals catched=%d\n", signal_catched);
+	closelog();
+
+	return 0;
+}

solutions/01_environment/daemon/justfile

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+build:
+    cmake -S . -B build && cmake --build build
+
+clean:
+    rm -rf build