AndroidLogger.hpp

#pragma once

#ifdef __ANDROID__
#include <pthread.h>
#include <android/log.h>

namespace android_log
{
    
static int pfd[2];
static pthread_t thr;
static const char* tag = "App";

static void* thread_func(void*)
{
    ssize_t rdsz;
    char buf[256];
    while((rdsz = read(pfd[0], buf, sizeof buf - 1)) > 0) 
    {
        if(buf[rdsz - 1] == '\n')
        {      
            --rdsz;
        }
        buf[rdsz] = 0;  /* add null-terminator */
        
        __android_log_write(ANDROID_LOG_DEBUG, tag, buf);
    }
    return 0;
}

int start_logger(const char* app_name)
{
    tag = app_name;

    /* make stdout line-buffered and stderr unbuffered */
    setvbuf(stdout, 0, _IOLBF, 0);
    setvbuf(stderr, 0, _IONBF, 0);

    /* create the pipe and redirect stdout and stderr */
    pipe(pfd);
    dup2(pfd[1], 1);
    dup2(pfd[1], 2);

    /* spawn the logging thread */
    if(pthread_create(&thr, 0, thread_func, 0) == -1)
    {
        return -1;
    }
    pthread_detach(thr);
    return 0;
}

} //android_log
#endif