Sharing memory with Android native app -


i'm trying create shared memory region follows:

jniexport jlong jnicall java_com_test_native_getshortbuffer(jnienv* env, jobject thiz,     jint channels, jint size) {     int bytes = (int)channels * (int)size * 2;     int fd = open("/dev/ashmem", o_creat | o_rdwr | o_direct | o_sync, s_irusr | s_iwusr);     if (fd < 0) return errno;      // 0 = let os choose start address     // last param = starting offset     char *data = static_cast<char*>(mmap(null, bytes, prot_read | prot_write, map_shared, fd, 0));     if (data == map_failed) { close(fd); return errno; }      return (jlong)data; }

but err 22, einval, says o_flags incorrect. tried variety of flags, such o_creat | o_rdwr, s_irusr | s_iwusr, no luck. flags see above came managed pull off (see here).

anyone know i'm doing wrong?


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