Reduce effort and memory of log monitor

core/jni/core/log_monitor.c

@@ -13,9 +13,36 @@
 #include "magisk.h"
 #include "utils.h"
 
-int logcat_events[] = { -1, -1, -1 };
 extern int is_daemon_init;
 
+static int am_proc_start_filter(const char *log) {
+	return strstr(log, "am_proc_start") != NULL;
+}
+
+static int magisk_log_filter(const char *log) {
+	char *ss;
+	return (ss = strstr(log, " Magisk")) && (ss[-1] != 'D') && (ss[-1] != 'V');
+}
+
+static int magisk_debug_log_filter(const char *log) {
+	return strstr(log, "Magisk") != NULL;
+}
+
+struct log_listener log_events[] = {
+	{	/* HIDE_EVENT */
+		.fd = -1,
+		.filter = am_proc_start_filter
+	},
+	{	/* LOG_EVENT */
+		.fd = -1,
+		.filter = magisk_log_filter
+	},
+	{	/* DEBUG_EVENT */
+		.fd = -1,
+		.filter = magisk_debug_log_filter
+	}
+};
+
 #ifdef MAGISK_DEBUG
 static int debug_log_pid, debug_log_fd;
 #endif
@@ -30,10 +57,10 @@ static void *logger_thread(void *args) {
 		// Start logcat
 		log_pid = exec_command(0, &log_fd, NULL, "logcat", "-b", "all" , "-v", "threadtime", "-s", "am_proc_start", "Magisk", NULL);
 		while (fdgets(line, sizeof(line), log_fd)) {
-			for (int i = 0; i < (sizeof(logcat_events) / sizeof(int)); ++i) {
+			for (int i = 0; i < (sizeof(log_events) / sizeof(struct log_listener)); ++i) {
-				if (logcat_events[i] > 0) {
+				if (log_events[i].fd > 0 && log_events[i].filter(line)) {
 					char *s = strdup(line);
-					xwrite(logcat_events[i], &s, sizeof(s));
+					xwrite(log_events[i].fd, &s, sizeof(s));
 				}
 			}
 			if (kill(log_pid, 0))
@@ -66,14 +93,12 @@ static void *magisk_log_thread(void *args) {
 		return NULL;
 
 	// Register our listener
-	logcat_events[LOG_EVENT] = pipefd[1];
+	log_events[LOG_EVENT].fd = pipefd[1];
 
 	LOGD("log_monitor: magisk log dumper start");
 
 	FILE *log;
-	char *ss;
 	for (char *line; xxread(pipefd[0], &line, sizeof(line)) > 0; free(line)) {
-		if ((ss = strstr(line, " Magisk")) && (ss[-1] != 'D') && (ss[-1] != 'V')) {
 		if (!have_data) {
 			if ((have_data = check_data())) {
 				// Dump buffered logs to file
@@ -92,7 +117,6 @@ static void *magisk_log_thread(void *args) {
 		if (have_data)
 			fprintf(log, "%s", line);
 	}
-	}
 	return NULL;
 }
 
@@ -106,13 +130,11 @@ static void *debug_magisk_log_thread(void *args) {
 	LOGD("log_monitor: debug log dumper start");
 
 	// Register our listener
-	logcat_events[DEBUG_EVENT] = pipefd[1];
+	log_events[DEBUG_EVENT].fd = pipefd[1];
 
-	for (char *line; xxread(pipefd[0], &line, sizeof(line)) > 0; free(line)) {
+	for (char *line; xxread(pipefd[0], &line, sizeof(line)) > 0; free(line))
-		char *ss;
-		if ((ss = strstr(line, "Magisk")))
 		fprintf(log, "%s", line);
-	}
+
 	return NULL;
 }
 

core/jni/include/logging.h

@@ -51,7 +51,13 @@ enum {
 	LOG_EVENT,
 	DEBUG_EVENT
 };
-extern int logcat_events[];
+
+struct log_listener {
+	int fd;
+	int (*filter) (const char*);
+};
+
+extern struct log_listener log_events[];
 
 void monitor_logs();
 void start_debug_full_log();

core/jni/magiskhide/proc_monitor.c

@@ -28,7 +28,7 @@ static void term_thread(int sig) {
 	destroy_list();
 	hideEnabled = 0;
 	// Unregister listener
-	logcat_events[HIDE_EVENT] = -1;
+	log_events[HIDE_EVENT].fd = -1;
 	close(pipefd[0]);
 	close(pipefd[1]);
 	pipefd[0] = pipefd[1] = -1;
@@ -193,16 +193,15 @@ void proc_monitor() {
 
 	// Register our listener to logcat monitor
 	xpipe2(pipefd, O_CLOEXEC);
-	logcat_events[HIDE_EVENT] = pipefd[1];
+	log_events[HIDE_EVENT].fd = pipefd[1];
 
-	for (char *log, *line; 1; free(log)) {
+	for (char *log, *line;; free(log)) {
 		if (read(pipefd[0], &log, sizeof(log)) != sizeof(log)) {
 			/* It might be interrupted */
 			log = NULL;
 			continue;
 		}
-		char *ss;
+		char *ss = strchr(log, '[');
-		if ((ss = strstr(log, "am_proc_start")) && (ss = strchr(ss, '['))) {
 		int pid, ret, comma = 0;
 		char *pos = ss, processName[256], ns[32];
 
@@ -222,8 +221,6 @@ void proc_monitor() {
 		if(ret != 2)
 			continue;
 
-			ret = 0;
-
 		// Critical region
 		pthread_mutex_lock(&hide_lock);
 		vec_for_each(hide_list, line) {
@@ -267,5 +264,4 @@ void proc_monitor() {
 		}
 		pthread_mutex_unlock(&hide_lock);
 	}
-	}
 }