40 lines
1.0 KiB
C
40 lines
1.0 KiB
C
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// https://codelab.wordpress.com/2014/11/03/how-to-use-standard-output-streams-for-logging-in-android-apps/
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#include <jni.h>
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#include <pthread.h>
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#include <stdio.h>
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#include <android/log.h>
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static int pfd[2];
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static pthread_t thr;
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static void *thread_func(void* param)
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{
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ssize_t rdsz;
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char buf[128];
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while((rdsz = read(pfd[0], buf, sizeof buf - 1)) > 0) {
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if(buf[rdsz - 1] == '\n') --rdsz;
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buf[rdsz] = 0; /* add null-terminator */
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__android_log_write(ANDROID_LOG_DEBUG, "StatusNativeLogs", buf);
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}
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return 0;
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}
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JNIEXPORT jint JNI_OnLoad(JavaVM* vm, void* reserved)
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{
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/* make stdout line-buffered and stderr unbuffered */
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setvbuf(stdout, 0, _IOLBF, 0);
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setvbuf(stderr, 0, _IONBF, 0);
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/* create the pipe and redirect stdout and stderr */
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pipe(pfd);
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dup2(pfd[1], 1);
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dup2(pfd[1], 2);
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/* spawn the logging thread */
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if(pthread_create(&thr, 0, thread_func, 0) == -1)
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return JNI_VERSION_1_6; // fail silently
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pthread_detach(thr);
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return JNI_VERSION_1_6;
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}
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