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  • /*
     * Copyright (C) 2019-2024 iopsys Software Solutions AB
     *
     * This program is free software; you can redistribute it and/or modify
     * it under the terms of the GNU Lesser General Public License version 2.1
     * as published by the Free Software Foundation
     *
     *	  Author: Amin Ben Romdhane <amin.benromdhane@iopsys.eu>
     *
     */
    
    #include "utils.h"
    
    #include "processes.h"
    
    #include <libbbfdm-api/bbfdm_api.h>
    
    
    #define DEFAULT_CPU_NAME "cpu"
    #define DEFAULT_CPU_POLL_INTERVAL "5"
    #define DEFAULT_CPU_NUM_SAMPLES "30"
    #define DEFAULT_CPU_CRITICAL_RISE_THRESHOLD "80"
    #define DEFAULT_CPU_CRITICAL_FALL_THRESHOLD "60"
    #define DEFAULT_CPU_CRITICAL_LOG_PATH "/var/log/critical_cpu.log"
    
    
    typedef struct process_entry {
    
    	struct list_head list;
    
    	char command[256];
    	char state[16];
    	char pid[8];
    	char size[8];
    	char priority[8];
    	char cputime[8];
    
    } process_entry;
    
    
    typedef struct jiffy_counts_t {
    	unsigned long long usr, nic, sys, idle;
    	unsigned long long iowait, irq, softirq, steal;
    
    	unsigned long long total_time;
    	unsigned long long idle_time;
    	unsigned long long sys_time;
    	unsigned long long busy_time;
    
    } jiffy_counts_t;
    
    
    typedef struct process_ctx {
    	struct ubus_context *ubus_ctx;
    	struct uloop_timeout instance_timer;
    	struct list_head list;
    	int refresh_interval;
    } process_ctx;
    
    
    typedef struct cpu_info {
    	struct uloop_timeout cpu_timer;
    	jiffy_counts_t jiffy;
    	bool enable;
    	bool enable_critical_log;
    	bool full_samples_reached;
    	unsigned int poll_interval;
    	unsigned int critical_rise_threshold;
    	unsigned int critical_fall_threshold;
    	unsigned int *user_utilization_samples;
    	unsigned int *system_utilization_samples;
    	unsigned int *idle_utilization_samples;
    	unsigned int *utilization_samples;
    	unsigned int num_samples;
    	time_t critical_rise_time;
    	time_t critical_fall_time;
    	size_t sample_index;
    	char log_file[512];
    } cpu_info_t;
    
    
    static process_ctx g_process_ctx = {0};
    
    static cpu_info_t g_cpu_info = {0};
    
    /*************************************************************
    * COMMON FUNCTIONS
    **************************************************************/
    static void get_jif_val(jiffy_counts_t *p_jif)
    {
    	FILE *file = NULL;
    	char line[128];
    	int ret;
    
    
    	// cppcheck-suppress cert-MSC24-C
    
    	if ((file = fopen("/proc/stat", "r"))) {
    		while(fgets(line, sizeof(line), file) != NULL)
    		{
    			remove_new_line(line);
    			ret = sscanf(line, "cpu %llu %llu %llu %llu %llu %llu %llu %llu", &p_jif->usr, &p_jif->nic, &p_jif->sys, &p_jif->idle,
    				&p_jif->iowait, &p_jif->irq, &p_jif->softirq, &p_jif->steal);
    
    			if (ret >= 4) {
    
    				p_jif->total_time = p_jif->usr + p_jif->nic + p_jif->sys + p_jif->idle
    
    					+ p_jif->iowait + p_jif->irq + p_jif->softirq + p_jif->steal;
    
    
    				p_jif->sys_time = p_jif->sys + p_jif->irq + p_jif->softirq;
    
    				p_jif->idle_time = p_jif->idle + p_jif->iowait;
    
    				p_jif->busy_time = p_jif->total_time - p_jif->idle_time;
    
    				break;
    			}
    		}
    		fclose(file);
    	}
    }
    
    static unsigned int get_cpu_load(jiffy_counts_t *prev_jif, jiffy_counts_t *cur_jif)
    {
    	unsigned total_diff, cpu;
    
    
    	total_diff = (unsigned)(cur_jif->total_time - prev_jif->total_time);
    
    
    	if (total_diff == 0)
    		total_diff = 1;
    
    
    	cpu = 100 * (unsigned)(cur_jif->busy_time - prev_jif->busy_time) / total_diff;
    
    
    	return cpu;
    }
    
    static unsigned int get_cpu_usage(void)
    {
    	jiffy_counts_t prev_jif = {0};
    	jiffy_counts_t cur_jif = {0};
    
    	get_jif_val(&prev_jif);
    	usleep(100000);
    	get_jif_val(&cur_jif);
    
    	return get_cpu_load(&prev_jif, &cur_jif);
    }
    
    static char *get_proc_state(char state)
    {
    	switch(state) {
    		case 'R':
    			return "Running";
    		case 'S':
    			return "Sleeping";
    		case 'T':
    			return "Stopped";
    		case 'D':
    			return "Uninterruptible";
    		case 'Z':
    			return "Zombie";
    		case 'I':
    			return "Idle";
    	};
    
    	return "Idle";
    }
    
    static void procps_get_cmdline(char *buf, int bufsz, const char *pid, const char *comm)
    {
    
    	char filename[270] = {0};
    
    
    	snprintf(filename, sizeof(filename), "/proc/%s/cmdline", pid);
    
    
    	int sz = dm_file_to_buf(filename, buf, bufsz);
    
    	if (sz > 0) {
    		const char *base;
    		int comm_len;
    
    		while (--sz >= 0 && buf[sz] == '\0')
    			continue;
    
    		/* Prevent basename("process foo/bar") = "bar" */
    		strchrnul(buf, ' ')[0] = '\0';
    		base = basename(buf); /* before we replace argv0's NUL with space */
    		while (sz >= 0) {
    			if ((unsigned char)(buf[sz]) < ' ')
    				buf[sz] = ' ';
    			sz--;
    		}
    
    		if (base[0] == '-') /* "-sh" (login shell)? */
    			base++;
    
    		/* If comm differs from argv0, prepend "{comm} ".
    		 * It allows to see thread names set by prctl(PR_SET_NAME).
    		 */
    		if (!comm)
    			return;
    
    		comm_len = strlen(comm);
    		/* Why compare up to comm_len?
    		 * Well, some processes rewrite argv, and use _spaces_ there
    		 * while rewriting. (KDE is observed to do it).
    		 * I prefer to still treat argv0 "process foo bar"
    		 * as 'equal' to comm "process".
    		 */
    		if (strncmp(base, comm, comm_len) != 0) {
    			comm_len += 3;
    			if (bufsz > comm_len)
    				memmove(buf + comm_len, buf, bufsz - comm_len);
    			snprintf(buf, bufsz, "{%s}", comm);
    			if (bufsz <= comm_len)
    				return;
    			buf[comm_len - 1] = ' ';
    			buf[bufsz - 1] = '\0';
    		}
    	} else {
    		snprintf(buf, bufsz, "[%s]", comm ? comm : "?");
    	}
    }
    
    
    static void init_process_list(void)
    {
    	struct dirent *entry = NULL;
    	DIR *dir = NULL;
    
    
    	dir = opendir("/proc");
    	if (dir == NULL)
    		return;
    
    
    	BBFDM_INFO("Init process list");
    
    	while ((entry = readdir(dir)) != NULL) {
    
    		struct stat stats = {0};
    		char buf[1024], fstat[288], command[256], comm[32];
    		char bsize[32], cputime[32], priori[32], state;
    		unsigned long stime, utime, vsize;
    		int priority, n;
    
    
    		int digit = entry->d_name[0] - '0';
    		if (digit < 0 || digit > 9)
    			continue;
    
    		snprintf(fstat, sizeof(fstat), "/proc/%s/stat", entry->d_name);
    		if (stat(fstat, &stats))
    			continue;
    
    
    		n = dm_file_to_buf(fstat, buf, sizeof(buf));
    
    		char *comm2 = strrchr(buf, ')'); /* split into "PID (cmd" and "<rest>" */
    
    		if (!comm2) /* sanity check */
    		  continue;
    
    		comm2[0] = '\0';
    
    		char *comm1 = strchr(buf, '(');
    
    		if (!comm1) /* sanity check */
    		  continue;
    
    		DM_STRNCPY(comm, comm1 + 1, sizeof(comm));
    
    		n = sscanf(comm2 + 2,			  /* Flawfinder: ignore */ \
    				"%c %*u "                 /* state, ppid */
    				"%*u %*u %*d %*s "        /* pgid, sid, tty, tpgid */
    				"%*s %*s %*s %*s %*s "    /* flags, min_flt, cmin_flt, maj_flt, cmaj_flt */
    				"%lu %lu "                /* utime, stime */
    				"%*u %*u %d "             /* cutime, cstime, priority */
    				"%*d "                    /* niceness */
    				"%*s %*s "                /* timeout, it_real_value */
    				"%*s "                    /* start_time */
    				"%lu "                    /* vsize */
    				,
    				&state,
    				&utime, &stime,
    				&priority,
    				&vsize
    			  );
    
    		if (n != 5)
    			continue;
    
    		procps_get_cmdline(command, sizeof(command), entry->d_name, comm);
    
    		snprintf(cputime, sizeof(cputime), "%lu", ((stime / sysconf(_SC_CLK_TCK)) + (utime / sysconf(_SC_CLK_TCK))) * 1000);
    		snprintf(bsize, sizeof(bsize), "%lu", vsize >> 10);
    		snprintf(priori, sizeof(priori), "%u", (unsigned)round((priority + 100) * 99 / 139));
    
    
    		process_entry *pentry = (process_entry *)calloc(1, sizeof(process_entry));
    		if (!pentry) {
    
    			BBFDM_ERR("failed to allocate memory for process entry");
    
    		list_add_tail(&pentry->list, &g_process_ctx.list);
    
    
    		DM_STRNCPY(pentry->pid, entry->d_name, sizeof(pentry->pid));
    		DM_STRNCPY(pentry->command, command, sizeof(pentry->command));
    		DM_STRNCPY(pentry->size, bsize, sizeof(pentry->size));
    		DM_STRNCPY(pentry->priority, priori, sizeof(pentry->priority));
    		DM_STRNCPY(pentry->cputime, cputime, sizeof(pentry->cputime));
    		DM_STRNCPY(pentry->state, get_proc_state(state), sizeof(pentry->state));
    	}
    
    	closedir(dir);
    
    }
    
    static void free_process_list(void)
    {
    	process_entry *entry = NULL, *tmp = NULL;
    
    
    	BBFDM_INFO("Free process list");
    
    
    	list_for_each_entry_safe(entry, tmp, &g_process_ctx.list, list) {
    		list_del(&entry->list);
    		FREE(entry);
    	}
    }
    
    static int get_instance_refresh_interval(void)
    {
    	char buf[8] = {0};
    
    
    	BBFDM_UCI_GET("sysmngr", "process", "instance_refresh_interval", "0", buf, sizeof(buf));
    
    
    	return (int)strtol(buf, NULL, 10);
    }
    
    static void run_refresh_process_list(void)
    {
    	free_process_list();
    	init_process_list();
    
    	if (g_process_ctx.refresh_interval > 0) {
    
    		BBFDM_INFO("Scheduling process list update after %d sec...", g_process_ctx.refresh_interval);
    
    		uloop_timeout_set(&g_process_ctx.instance_timer, g_process_ctx.refresh_interval * 1000);
    	}
    
    static void ubus_call_complete_cb(struct ubus_request *req, int ret)
    {
    
    	BBFDM_DEBUG("'tr069' ubus callback completed");
    
    	run_refresh_process_list();
    	FREE(req);
    }
    
    static void process_refresh_instance_timer(struct uloop_timeout *timeout)
    {
    	struct blob_buf bb = {0};
    
    	memset(&bb, 0, sizeof(struct blob_buf));
    
    	blob_buf_init(&bb, 0);
    
    	int res = bbfdm_ubus_invoke_async(g_process_ctx.ubus_ctx, "tr069", "status", bb.head, NULL, ubus_call_complete_cb);
    
    	blob_buf_free(&bb);
    
    	if (res) {
    
    		BBFDM_DEBUG("Update process list: 'tr069' ubus object not found");
    
    		run_refresh_process_list();
    	} else {
    
    		BBFDM_DEBUG("Process list will be updated after 'tr069' ubus session completes");
    
    static void send_cpu_critical_state_event(unsigned int cpu_utilization)
    {
    	struct blob_buf bb = {0};
    	char buf[32] = {0};
    
    	snprintf(buf, sizeof(buf), "%u", cpu_utilization);
    
    	memset(&bb, 0, sizeof(struct blob_buf));
    	blob_buf_init(&bb, 0);
    
    	blobmsg_add_string(&bb, "name", "Device.DeviceInfo.ProcessStatus.CPU.1.CPUCriticalState!");
    
    	void *arr = blobmsg_open_array(&bb, "input");
    
    	void *cpu_table = blobmsg_open_table(&bb, NULL);
    	blobmsg_add_string(&bb, "path", "CPUUtilization");
    	blobmsg_add_string(&bb, "data", buf);
    	blobmsg_add_string(&bb, "type", DMT_TYPE[DMT_UNINT]);
    	blobmsg_close_table(&bb, cpu_table);
    
    	void *name_table = blobmsg_open_table(&bb, NULL);
    	blobmsg_add_string(&bb, "path", "Name");
    	blobmsg_add_string(&bb, "data", DEFAULT_CPU_NAME);
    	blobmsg_add_string(&bb, "type", DMT_TYPE[DMT_STRING]);
    	blobmsg_close_table(&bb, name_table);
    
    	blobmsg_close_array(&bb, arr);
    
    
    	BBFDM_UBUS_SEND_EVENT("bbfdm.event", bb.head);
    
    
    	BBFDM_DEBUG("'CPUCriticalState!' event sent successfully with utilization at %u%%.", cpu_utilization);
    
    
    	blob_buf_free(&bb);
    }
    
    static unsigned int calculate_average_samples(unsigned int *samples)
    {
    	unsigned int num_samples = g_cpu_info.full_samples_reached ? g_cpu_info.num_samples : g_cpu_info.sample_index;
    	unsigned int sum = 0;
    
    	for (size_t i = 0; i < num_samples; i++) {
    		sum += samples[i];
    	}
    
    	return num_samples ? (sum / num_samples) : 0;
    }
    
    static void run_cpu_monitor(void)
    {
    	char buf[32] = {0};
    
    	jiffy_counts_t prev_jiffy = {
    		.total_time = g_cpu_info.jiffy.total_time,
    		.idle_time = g_cpu_info.jiffy.idle_time,
    		.sys_time = g_cpu_info.jiffy.sys_time,
    		.busy_time = g_cpu_info.jiffy.busy_time,
    		.usr = g_cpu_info.jiffy.usr
    	};
    
    	get_jif_val(&g_cpu_info.jiffy);
    
    	unsigned long long total_diff = g_cpu_info.jiffy.total_time - prev_jiffy.total_time;
    
    	if (total_diff == 0)
    		total_diff = 1;
    
    	g_cpu_info.user_utilization_samples[g_cpu_info.sample_index] = ((g_cpu_info.jiffy.usr - prev_jiffy.usr) * 100) / total_diff;
    	g_cpu_info.system_utilization_samples[g_cpu_info.sample_index] = ((g_cpu_info.jiffy.sys_time - prev_jiffy.sys_time) * 100) / total_diff;
    	g_cpu_info.idle_utilization_samples[g_cpu_info.sample_index] = ((g_cpu_info.jiffy.idle_time - prev_jiffy.idle_time) * 100) / total_diff;
    	g_cpu_info.utilization_samples[g_cpu_info.sample_index] = ((g_cpu_info.jiffy.busy_time - prev_jiffy.busy_time) * 100) / total_diff;
    
    	if (!g_cpu_info.full_samples_reached) {
    	    g_cpu_info.full_samples_reached = ((g_cpu_info.sample_index + 1) >= g_cpu_info.num_samples);
    	}
    
    	g_cpu_info.sample_index = (g_cpu_info.sample_index + 1) % g_cpu_info.num_samples;
    
    	unsigned int avg_utilization = calculate_average_samples(g_cpu_info.utilization_samples);
    
    	if ((avg_utilization > g_cpu_info.critical_rise_threshold) &&
    		(g_cpu_info.critical_fall_time >= g_cpu_info.critical_rise_time)) {
    
    
    		BBFDM_ERR("CPU utilization reached critical threshold: %u%% !!!!!!!!", avg_utilization);
    
    
    		// Update CriticalRiseTimeStamp to the current time
    		g_cpu_info.critical_rise_time = time(NULL);
    		snprintf(buf, sizeof(buf), "%ld", (long int)g_cpu_info.critical_rise_time);
    
    		BBFDM_UCI_SET("sysmngr", "cpu", "critical_rise_time", buf);
    
    
    		if (g_cpu_info.enable_critical_log) {
    			// Generate log into the vendor log file referenced by 'VendorLogFileRef' parameter indicating critical condition is reached
    			sysmngr_generate_critical_log_file(g_cpu_info.log_file, "CPU", true);
    		}
    
    		// Send 'CPUCriticalState!' event
    		send_cpu_critical_state_event(avg_utilization);
    	}
    
    	if ((avg_utilization < g_cpu_info.critical_fall_threshold) &&
    		(g_cpu_info.critical_rise_time > g_cpu_info.critical_fall_time)) {
    
    
    		BBFDM_ERR("CPU utilization has fallen below critical threshold: %u%% !!!!!!!!", avg_utilization);
    
    
    		// Update CriticalFallTimeStamp to the current time
    		g_cpu_info.critical_fall_time = time(NULL);
    		snprintf(buf, sizeof(buf), "%ld", (long int)g_cpu_info.critical_fall_time);
    
    		BBFDM_UCI_SET("sysmngr", "cpu", "critical_fall_time", buf);
    
    
    		if (g_cpu_info.enable_critical_log) {
    			// Generate log into the vendor log file referenced by 'VendorLogFileRef' parameter indicating that the critical condition is no longer present
    			sysmngr_generate_critical_log_file(g_cpu_info.log_file, "CPU", false);
    		}
    	}
    
    
    	BBFDM_INFO("Next memory monitor check scheduled in %d sec...", g_cpu_info.poll_interval);
    
    	uloop_timeout_set(&g_cpu_info.cpu_timer, g_cpu_info.poll_interval * 1000);
    }
    
    static void cpu_timer_callback(struct uloop_timeout *timeout)
    {
    	run_cpu_monitor();
    }
    
    static int fill_global_cpu_info(void)
    {
    	char buf[16] = {0};
    
    	memset(&g_cpu_info, 0, sizeof(struct cpu_info));
    
    	g_cpu_info.cpu_timer.cb = cpu_timer_callback;
    
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "enable", "0", buf, sizeof(buf));
    
    	g_cpu_info.enable = ((int)strtol(buf, NULL, 10) != 0);
    
    	BBFDM_DEBUG("Memory Monitor Config: |Enable| |%d|", g_cpu_info.enable);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "enable_critical_log", "0", buf, sizeof(buf));
    
    	g_cpu_info.enable_critical_log = ((int)strtol(buf, NULL, 10) != 0);
    
    	BBFDM_DEBUG("Memory Monitor Config: |EnableCriticalLog| |%d|", g_cpu_info.enable_critical_log);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "poll_interval", DEFAULT_CPU_POLL_INTERVAL, buf, sizeof(buf));
    
    	g_cpu_info.poll_interval = strtoul(buf, NULL, 10);
    
    	BBFDM_DEBUG("Memory Monitor Config: |PollInterval| |%lu|", g_cpu_info.poll_interval);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "num_samples", DEFAULT_CPU_NUM_SAMPLES, buf, sizeof(buf));
    
    	g_cpu_info.num_samples = strtoul(buf, NULL, 10);
    
    	BBFDM_DEBUG("Memory Monitor Config: |NumSamples| |%lu|", g_cpu_info.num_samples);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "critical_rise_threshold", DEFAULT_CPU_CRITICAL_RISE_THRESHOLD, buf, sizeof(buf));
    
    	g_cpu_info.critical_rise_threshold = strtoul(buf, NULL, 10);
    
    	BBFDM_DEBUG("Memory Monitor Config: |CriticalRiseThreshold| |%lu|", g_cpu_info.critical_rise_threshold);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "critical_fall_threshold", DEFAULT_CPU_CRITICAL_FALL_THRESHOLD, buf, sizeof(buf));
    
    	g_cpu_info.critical_fall_threshold = strtoul(buf, NULL, 10);
    
    	BBFDM_DEBUG("Memory Monitor Config: |CriticalFallThreshold| |%lu|", g_cpu_info.critical_fall_threshold);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "critical_rise_time", "0", buf, sizeof(buf));
    
    	g_cpu_info.critical_rise_time = strtol(buf, NULL, 10);
    
    	BBFDM_DEBUG("Memory Monitor Config: |CriticalRiseTimeStamp| |%lu|", g_cpu_info.critical_rise_time);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "critical_fall_time", "0", buf, sizeof(buf));
    
    	g_cpu_info.critical_fall_time = strtol(buf, NULL, 10);
    
    	BBFDM_DEBUG("Memory Monitor Config: |CriticalFallTimeStamp| |%lu|", g_cpu_info.critical_fall_time);
    
    	BBFDM_UCI_GET("sysmngr", "cpu", "file_path", DEFAULT_CPU_CRITICAL_LOG_PATH, g_cpu_info.log_file, sizeof(g_cpu_info.log_file));
    	BBFDM_DEBUG("Memory Monitor Config: |FilePath| |%s|", g_cpu_info.log_file);
    
    	if (!file_exists(g_cpu_info.log_file)) {
    		// Create empty file if it doesn't exist
    		create_empty_file(g_cpu_info.log_file);
    	}
    
    	g_cpu_info.utilization_samples = calloc(g_cpu_info.num_samples, sizeof(unsigned int));
    	g_cpu_info.user_utilization_samples = calloc(g_cpu_info.num_samples, sizeof(unsigned int));
    	g_cpu_info.system_utilization_samples = calloc(g_cpu_info.num_samples, sizeof(unsigned int));
    	g_cpu_info.idle_utilization_samples = calloc(g_cpu_info.num_samples, sizeof(unsigned int));
    	if (!g_cpu_info.utilization_samples || !g_cpu_info.user_utilization_samples ||
    		!g_cpu_info.system_utilization_samples || !g_cpu_info.idle_utilization_samples) {
    
    		BBFDM_ERR("Failed to allocate memory for mode utilization samples");
    
    		return -1;
    	}
    
    	get_jif_val(&g_cpu_info.jiffy);
    	return 0;
    }
    
    static void free_global_cpu_info(void)
    {
    	FREE(g_cpu_info.utilization_samples);
    	FREE(g_cpu_info.user_utilization_samples);
    	FREE(g_cpu_info.system_utilization_samples);
    	FREE(g_cpu_info.idle_utilization_samples);
    }
    
    
    /*************************************************************
    * EXTERNAL APIS
    **************************************************************/
    void sysmngr_process_init(struct ubus_context *ubus_ctx)
    {
    	g_process_ctx.ubus_ctx = ubus_ctx;
    	g_process_ctx.refresh_interval = get_instance_refresh_interval();
    	g_process_ctx.instance_timer.cb = process_refresh_instance_timer;
    	INIT_LIST_HEAD(&g_process_ctx.list);
    
    	run_refresh_process_list();
    }
    
    void sysmngr_process_clean(struct ubus_context *ubus_ctx)
    {
    	free_process_list();
    	uloop_timeout_cancel(&g_process_ctx.instance_timer);
    }
    
    void sysmngr_cpu_init(void)
    {
    	int res = fill_global_cpu_info();
    	if (res) {
    
    		BBFDM_ERR("Can't start CPU monitoring!!");
    
    		BBFDM_INFO("CPU monitoring is disabled.");
    
    		BBFDM_INFO("CPU monitoring is enabled");
    
    	BBFDM_INFO("Next CPU monitor check scheduled in %d sec...", g_cpu_info.poll_interval);
    
    	uloop_timeout_set(&g_cpu_info.cpu_timer, g_cpu_info.poll_interval * 1000);
    }
    
    void sysmngr_cpu_clean(void)
    {
    	free_global_cpu_info();
    	uloop_timeout_cancel(&g_cpu_info.cpu_timer);
    
    	BBFDM_INFO("CPU monitoring process stopped");
    
    /*************************************************************
    * ENTRY METHOD
    **************************************************************/
    static int browseProcessEntriesInst(struct dmctx *dmctx, DMNODE *parent_node, void *prev_data, char *prev_instance)
    {
    	struct process_entry *entry = NULL;
    	struct dm_data curr_data = {0};
    	char *inst = NULL;
    	int id = 0;
    
    
    	if (g_process_ctx.refresh_interval <= 0) {
    
    		BBFDM_INFO("Scheduling process list update after 2 sec...");
    
    		uloop_timeout_set(&g_process_ctx.instance_timer, 2 * 1000);
    	}
    
    	list_for_each_entry(entry, &g_process_ctx.list, list) {
    
    
    		curr_data.additional_data = entry;
    
    		inst = handle_instance_without_section(dmctx, parent_node, ++id);
    
    		if (DM_LINK_INST_OBJ(dmctx, parent_node, &curr_data, inst) == DM_STOP)
    			break;
    	}
    
    static int browseDeviceInfoProcessStatusCPUInst(struct dmctx *dmctx, DMNODE *parent_node, void *prev_data, char *prev_instance)
    {
    	struct dm_data data = {0};
    
    	struct uci_section *s = is_dmmap_section_exist("dmmap_sysmngr", "cpu");
    	if (!s) dmuci_add_section_bbfdm("dmmap_sysmngr", "cpu", &s);
    
    	data.dmmap_section = s;
    
    	handle_instance(dmctx, parent_node, s, "cpu_instance", "cpu_alias");
    	DM_LINK_INST_OBJ(dmctx, parent_node, &data, "1");
    	return 0;
    
    
    }
    
    
    /*************************************************************
    * GET & SET PARAM
    **************************************************************/
    static int get_process_cpu_usage(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    
    	char *cpu_monitor_enable = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "enable", "0");
    
    	if (DM_STRCMP(cpu_monitor_enable, "1") == 0) {
    		dmasprintf(value, "%u", calculate_average_samples(g_cpu_info.utilization_samples));
    	} else {
    		dmasprintf(value, "%u", get_cpu_usage());
    	}
    
    
    	return 0;
    }
    
    static int get_process_number_of_entries(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	int cnt = get_number_of_entries(ctx, data, instance, browseProcessEntriesInst);
    	dmasprintf(value, "%d", cnt);
    	return 0;
    }
    
    
    static int get_DeviceInfoProcessStatus_CPUNumberOfEntries(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	int cnt = get_number_of_entries(ctx, data, instance, browseDeviceInfoProcessStatusCPUInst);
    	dmasprintf(value, "%d", cnt);
    	return 0;
    }
    
    
    static int get_process_pid(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = data ? ((struct process_entry *)((struct dm_data *)data)->additional_data)->pid : "";
    	return 0;
    }
    
    static int get_process_command(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = data ? ((struct process_entry *)((struct dm_data *)data)->additional_data)->command : "";
    	return 0;
    }
    
    static int get_process_size(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = data ? ((struct process_entry *)((struct dm_data *)data)->additional_data)->size : "";
    	return 0;
    }
    
    static int get_process_priority(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = data ? ((struct process_entry *)((struct dm_data *)data)->additional_data)->priority : "";
    	return 0;
    }
    
    static int get_process_cpu_time(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = data ? ((struct process_entry *)((struct dm_data *)data)->additional_data)->cputime : "";
    	return 0;
    }
    
    static int get_process_state(char* refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = data ? ((struct process_entry *)((struct dm_data *)data)->additional_data)->state : "";
    	return 0;
    }
    
    
    static int get_DeviceInfoProcessStatusCPU_Alias(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	return bbf_get_alias(ctx, ((struct dm_data *)data)->dmmap_section, "cpu_alias", instance, value);
    }
    
    static int set_DeviceInfoProcessStatusCPU_Alias(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	return bbf_set_alias(ctx, ((struct dm_data *)data)->dmmap_section, "cpu_alias", instance, value);
    }
    
    static int get_DeviceInfoProcessStatusCPU_Name(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmstrdup(DEFAULT_CPU_NAME);
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_Enable(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "enable", "0");
    	return 0;
    }
    
    static int set_DeviceInfoProcessStatusCPU_Enable(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	bool b;
    
    	switch (action)	{
    		case VALUECHECK:
    			if (bbfdm_validate_boolean(ctx, value))
    				return FAULT_9007;
    			break;
    		case VALUESET:
    			string_to_bool(value, &b);
    			dmuci_set_value("sysmngr", "cpu", "enable", b ? "1" : "0");
    			break;
    	}
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_UpTime(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	dmasprintf(value, "%d", sysmngr_get_uptime());
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_UserModeUtilization(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	dmasprintf(value, "%u", calculate_average_samples(g_cpu_info.user_utilization_samples));
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_SystemModeUtilization(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	dmasprintf(value, "%u", calculate_average_samples(g_cpu_info.system_utilization_samples));
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_IdleModeUtilization(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	dmasprintf(value, "%u", calculate_average_samples(g_cpu_info.idle_utilization_samples));
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_CPUUtilization(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	dmasprintf(value, "%u", calculate_average_samples(g_cpu_info.utilization_samples));
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_PollInterval(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "poll_interval", DEFAULT_CPU_POLL_INTERVAL);
    	return 0;
    }
    
    static int set_DeviceInfoProcessStatusCPU_PollInterval(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	switch (action)	{
    		case VALUECHECK:
    			if (bbfdm_validate_unsignedInt(ctx, value, RANGE_ARGS{{NULL,NULL}}, 1))
    				return FAULT_9007;
    			break;
    		case VALUESET:
    			dmuci_set_value("sysmngr", "cpu", "poll_interval", value);
    			break;
    	}
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_NumSamples(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "num_samples", DEFAULT_CPU_NUM_SAMPLES);
    	return 0;
    }
    
    static int set_DeviceInfoProcessStatusCPU_NumSamples(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	switch (action)	{
    		case VALUECHECK:
    			if (bbfdm_validate_unsignedInt(ctx, value, RANGE_ARGS{{"1","300"}}, 1))
    				return FAULT_9007;
    			break;
    		case VALUESET:
    			dmuci_set_value("sysmngr", "cpu", "num_samples", value);
    			break;
    	}
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_CriticalRiseThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "critical_rise_threshold", DEFAULT_CPU_CRITICAL_RISE_THRESHOLD);
    	return 0;
    }
    
    static int set_DeviceInfoProcessStatusCPU_CriticalRiseThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	switch (action)	{
    		case VALUECHECK:
    			if (bbfdm_validate_unsignedInt(ctx, value, RANGE_ARGS{{NULL,"100"}}, 1))
    				return FAULT_9007;
    			break;
    		case VALUESET:
    			dmuci_set_value("sysmngr", "cpu", "critical_rise_threshold", value);
    			break;
    	}
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_CriticalFallThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "critical_fall_threshold", DEFAULT_CPU_CRITICAL_FALL_THRESHOLD);
    	return 0;
    }
    
    static int set_DeviceInfoProcessStatusCPU_CriticalFallThreshold(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	switch (action)	{
    		case VALUECHECK:
    			if (bbfdm_validate_unsignedInt(ctx, value, RANGE_ARGS{{NULL,"100"}}, 1))
    				return FAULT_9007;
    			break;
    		case VALUESET:
    			dmuci_set_value("sysmngr", "cpu", "critical_fall_threshold", value);
    			break;
    	}
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_CriticalRiseTimeStamp(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	char *rise_time = NULL;
    
    	dmuci_get_option_value_string("sysmngr", "cpu", "critical_rise_time", &rise_time);
    
    	return dm_time_utc_format(DM_STRTOL(rise_time), value);
    }
    
    static int get_DeviceInfoProcessStatusCPU_CriticalFallTimeStamp(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	char *fall_time = NULL;
    
    	dmuci_get_option_value_string("sysmngr", "cpu", "critical_fall_time", &fall_time);
    
    	return dm_time_utc_format(DM_STRTOL(fall_time), value);
    }
    
    static int get_DeviceInfoProcessStatusCPU_EnableCriticalLog(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "enable_critical_log", "0");
    	return 0;
    }
    
    static int set_DeviceInfoProcessStatusCPU_EnableCriticalLog(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	bool b;
    
    	switch (action)	{
    		case VALUECHECK:
    			if (bbfdm_validate_boolean(ctx, value))
    				return FAULT_9007;
    			break;
    		case VALUESET:
    			string_to_bool(value, &b);
    			dmuci_set_value("sysmngr", "cpu", "enable_critical_log", b ? "1" : "0");
    			break;
    	}
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_VendorLogFileRef(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	char *file_path = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "file_path", DEFAULT_CPU_CRITICAL_LOG_PATH);
    
    	if (file_exists(file_path)) {
    		char file_uri[512] = {0};
    
    		// if there is a path, then prepend file:// to it to comply with bbf requirement of file URI
    		snprintf(file_uri, sizeof(file_uri), "file://%s", file_path);
    
    		// get the vendor file path
    		_bbfdm_get_references(ctx, "Device.DeviceInfo.VendorLogFile.", "Name", file_uri, value);
    	}
    	return 0;
    }
    
    static int get_DeviceInfoProcessStatusCPU_FilePath(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "file_path", DEFAULT_CPU_CRITICAL_LOG_PATH);
    	return 0;
    }
    
    static int set_DeviceInfoProcessStatusCPU_FilePath(char *refparam, struct dmctx *ctx, void *data, char *instance, char *value, int action)
    {
    	char *file_path = dmuci_get_option_value_fallback_def("sysmngr", "cpu", "file_path", DEFAULT_CPU_CRITICAL_LOG_PATH);
    
    	switch (action)	{
    		case VALUECHECK:
    			if (bbfdm_validate_string(ctx, value, -1, -1, NULL, NULL))
    				return FAULT_9007;
    
    			// Restriction: The path in `value` must either:
    			// - Start with "/var/log" for non-persistent logs, or
    			// - Start with "/log/" for persistent logs.
    			// Additionally, the path should not contain any '..' sequences
    			// to prevent directory traversal or invalid file paths.
    			if (!((strncmp(value, "/var/log", 8) == 0 || strncmp(value, "/log/", 5) == 0) && !strstr(value, ".."))) {
    				bbfdm_set_fault_message(ctx, "");
    				return FAULT_9007;
    			}
    
    			break;
    		case VALUESET:
    			if (file_exists(file_path)) {
    				struct uci_section *dmmap_sec = NULL;
    				char file_uri[512] = {0};
    
    				if (rename(file_path, value) != 0) {
    					bbfdm_set_fault_message(ctx, "Can't rename file from '%s' -> '%s'", file_path, value);
    					return FAULT_9007;
    				}
    
    				// Update VendorLogFile dmmap section
    				snprintf(file_uri, sizeof(file_uri), "file://%s", file_path);
    				dmmap_sec = get_dup_section_in_dmmap_opt("dmmap", "vendorlog", "log_file", file_uri);
    
    				snprintf(file_uri, sizeof(file_uri), "file://%s", value);
    				dmuci_set_value_by_section(dmmap_sec, "log_file", file_uri);
    			}
    
    			dmuci_set_value("sysmngr", "cpu", "file_path", value);
    			break;
    	}
    	return 0;
    }
    
    /*************************************************************
     * EVENTS
     *************************************************************/
    static event_args CPUCriticalState_event_args = {
    	.name = "", // This field is left empty because we are not listening to any external events, The system now operates within a single unified daemon,
    				// removing the need for separate event listeners. See send_cpu_critical_state_event API for details on implementation.
    	.param = (const char *[]) {
    		"CPUUtilization",
    		"Name",
    		NULL
    	}
    };
    
    static int get_event_CPUCriticalState(char *refparam, struct dmctx *ctx, void *data, char *instance, char **value)
    {
    	*value = (char *)&CPUCriticalState_event_args;
    	return 0;
    }
    
    
    /**********************************************************************************************************************************
    *                                            OBJ & LEAF DEFINITION
    ***********************************************************************************************************************************/
    /* *** Device.DeviceInfo.ProcessStatus.Process.{i}. *** */
    DMLEAF tDeviceInfoProcessStatusProcessParams[] = {
    
    /* PARAM, permission, type, getvalue, setvalue, bbfdm_type */
    
    {"PID", &DMREAD, DMT_UNINT, get_process_pid, NULL, BBFDM_BOTH, DM_FLAG_UNIQUE},
    {"Command", &DMREAD, DMT_STRING, get_process_command, NULL, BBFDM_BOTH},
    {"Size", &DMREAD, DMT_UNINT, get_process_size, NULL, BBFDM_BOTH},
    {"Priority", &DMREAD, DMT_UNINT, get_process_priority, NULL, BBFDM_BOTH},
    {"CPUTime", &DMREAD, DMT_UNINT, get_process_cpu_time, NULL, BBFDM_BOTH},
    {"State", &DMREAD, DMT_STRING, get_process_state, NULL, BBFDM_BOTH},
    {0}
    };
    
    
    /* *** Device.DeviceInfo.ProcessStatus.CPU.{i}. *** */
    DMLEAF tDeviceInfoProcessStatusCPUParams[] = {
    /* PARAM, permission, type, getvalue, setvalue, bbfdm_type */
    {"Alias", &DMWRITE, DMT_STRING, get_DeviceInfoProcessStatusCPU_Alias, set_DeviceInfoProcessStatusCPU_Alias, BBFDM_BOTH},
    {"Name", &DMREAD, DMT_STRING, get_DeviceInfoProcessStatusCPU_Name, NULL, BBFDM_BOTH, DM_FLAG_UNIQUE|DM_FLAG_LINKER},
    {"Enable", &DMWRITE, DMT_BOOL, get_DeviceInfoProcessStatusCPU_Enable, set_DeviceInfoProcessStatusCPU_Enable, BBFDM_BOTH},
    {"UpTime", &DMREAD, DMT_UNINT, get_DeviceInfoProcessStatusCPU_UpTime, NULL, BBFDM_BOTH},
    {"UserModeUtilization", &DMREAD, DMT_UNINT, get_DeviceInfoProcessStatusCPU_UserModeUtilization, NULL, BBFDM_BOTH},
    {"SystemModeUtilization", &DMREAD, DMT_UNINT, get_DeviceInfoProcessStatusCPU_SystemModeUtilization, NULL, BBFDM_BOTH},
    {"IdleModeUtilization", &DMREAD, DMT_UNINT, get_DeviceInfoProcessStatusCPU_IdleModeUtilization, NULL, BBFDM_BOTH},
    {"CPUUtilization", &DMREAD, DMT_UNINT, get_DeviceInfoProcessStatusCPU_CPUUtilization, NULL, BBFDM_BOTH},
    {"PollInterval", &DMWRITE, DMT_UNINT, get_DeviceInfoProcessStatusCPU_PollInterval, set_DeviceInfoProcessStatusCPU_PollInterval, BBFDM_BOTH},
    {"NumSamples", &DMWRITE, DMT_UNINT, get_DeviceInfoProcessStatusCPU_NumSamples, set_DeviceInfoProcessStatusCPU_NumSamples, BBFDM_BOTH},
    {"CriticalRiseThreshold", &DMWRITE, DMT_UNINT, get_DeviceInfoProcessStatusCPU_CriticalRiseThreshold, set_DeviceInfoProcessStatusCPU_CriticalRiseThreshold, BBFDM_BOTH},