Magisk/jni/daemon/log_monitor.c

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/* log_monitor.c - New thread to monitor logcat
*
* Open a new thread to call logcat and get logs with tag "Magisk"
* Also, write the logs to a log file for debugging purpose
*
*/
#include <stdio.h>
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#include <limits.h>
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#include <pthread.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include "magisk.h"
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#include "utils.h"
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#include "daemon.h"
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static void *logger_thread(void *args) {
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// Setup error handler
err_handler = exit_thread;
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rename(LOGFILE, LASTLOG);
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int log_fd, log_pid;
log_fd = xopen(LOGFILE, O_WRONLY | O_CREAT | O_CLOEXEC | O_TRUNC, 0644);
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while (1) {
// Start logcat
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log_pid = exec_command(0, &log_fd, NULL, "logcat", "-s", "Magisk", "-v", "thread", NULL);
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if (log_pid > 0)
waitpid(log_pid, NULL, 0);
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// For some reason it went here, clear buffer and restart
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exec_command_sync("logcat", "-c", NULL);
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}
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// Should never be here, but well...
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return NULL;
}
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/* Start a new thread to monitor logcat and dump to logfile */
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void monitor_logs() {
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pthread_t thread;
xpthread_create(&thread, NULL, logger_thread, NULL);
pthread_detach(thread);
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}