fsetxattr got errno 95

[chenqi...@gmail.com]

When I call fsetxattr on InternalStorage file, it works

but on AdoptableStorage file (my be externalStorage? connect by usb),  get errno 95

Here art my code

java side 

// File testFile = new File("/data/data/Android/data/com.xxx.xxx/files/test_attr.txt");

File testFile = new File("/storage/80E9-8A2E/Android/data/com.xxx.xxx/files/test_attr.txt");
testFile.createNewFile();
FileInputStream fis = new FileInputStream(testFile);
FileDescriptor fd = fis.getFD();
Field descriptor = ReflectionUtils.getDeclaredField(FileDescriptor.class, "descriptor");
descriptor.setAccessible(true);
int descriptorInt = (int) descriptor.get(fd);
Logger.info("testattr fd " + descriptorInt);
String setAttrRet = testSetAttr(descriptorInt);
Logger.info("testattr setAttrRet " + setAttrRet);
String getAttrRet = testGetAttr(descriptorInt);
Logger.info("testattr getAttrRet " + getAttrRet);

cpp side

jstring testSetAttr(JNIEnv *env, jclass clazz, jint fd) {
int ret = fsetxattr(fd, "user.test", "testjni", 8, XATTR_CREATE);
std::string str = std::to_string(ret);
LOGI("testSetAttr ret=%d", errno);
return env->NewStringUTF(str.c_str());
}
jstring testGetAttr(JNIEnv *env, jclass clazz, jint fd) {
char buf[1024];
int ret = fgetxattr(fd, "user.test", buf, 1024);
std::string str = std::string(buf, ret);
return env->NewStringUTF(str.c_str());
}

[enh]

yes, that's WAI. all will be clear if you use strerror(3) to turn that
errno value into the corresponding error string...

(which is what you should have done in the first place --- you never
want to log errno _integers_ because they aren't all the same for all
architectures. Android supports %m in format strings for this since
API level 29. API level 35 will add strerrorname_np() and
strerrordesc_np().
https://android.googlesource.com/platform/bionic/+/HEAD/docs/status.md)

> --
> You received this message because you are subscribed to the Google Groups "android-ndk" group.
> To unsubscribe from this group and stop receiving emails from it, send an email to android-ndk...@googlegroups.com.
> To view this discussion on the web visit https://groups.google.com/d/msgid/android-ndk/a7db8d7d-9ae5-4c52-a88b-35316b89e164n%40googlegroups.com.