Unix Domain Sockets API > 29

[mike mcnulty]

Hello,

My team is trying to implement UDS in native C++ using API 33. When we try to bind our socket at address '\0program-uds' for example we get a bind: "Read-only file system error".

I can't find any recent documentation indicating that abstract UDS are still supported. 

Any help would be appreciated!

[Dan Albert]

https://github.com/android/ndk/issues/1469 was the previous time someone asked about this. I don't know if the OP ever followed through on that. I suspect the error message is the answer though.

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[mike mcnulty]

For all that may come across this post in the future.

My team has successfully implemented UDS using native C++ API version 33.

Our particular problem was the null byte "\0" used to define our abstract UDS wasn't properly being passed from the JNI layer to our C++ application. At this time we are still hard coding the UDS path in native C++ to avoid this issue.

Thanks

[Pete Bentley]

> Our particular problem was the null byte "\0" used to define our abstract UDS wasn't properly being passed from the JNI layer to our C++ application

Without the '\0' then yeah, you're not in the abstract namespace and you're going to be subject to POSIX and SE Linux filesystem permissions.

If you're struggling to share the address between Java and native code, you could do worse than create it using UnixSocketAddress.createAbstract() and take a look at the platform code which converts to struct sockaddr used by methods such as android.system.Os.bind().

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[Phil Burk]

> Our particular problem was the null byte "\0" used to define our abstract UDS wasn't properly being passed from the JNI layer to our C++ application.

Did you pass a numBytes of strlen(s) or (strlen(s)+1)?

Phil Burk

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