status-mobile/android/app/jni/Log.c

40 lines
1.0 KiB
C

// https://codelab.wordpress.com/2014/11/03/how-to-use-standard-output-streams-for-logging-in-android-apps/
#include <jni.h>
#include <pthread.h>
#include <stdio.h>
#include <android/log.h>
static int pfd[2];
static pthread_t thr;
static void *thread_func(void* param)
{
ssize_t rdsz;
char buf[128];
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, "StatusNativeLogs", buf);
}
return 0;
}
JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved)
{
/* 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 JNI_VERSION_1_6; // fail silently
pthread_detach(thr);
return JNI_VERSION_1_6;
}