Very recently we implemented minimal rnetlink support on OSv side which allowed us to finally switch to the netlink-based implementation of getifaddrs() and if_nameindex().

However, I noticed that the function __netlink_enumerate() in https://github.com/ifduyue/musl/blob/master/src/network/netlink.c uses MSG_DONTWAIT flag when calling recv() which may fail with EAGAIN or EWOULDBLOCK and there is no error/retry handling for that. I actually saw both functions fail occasionally on OSv.

One way to fix is to add missing error handling. But another simpler solution is to stop using MSG_DONTWAIT altogether and force recv() to block. In other words, the line:

should change to:

For time being we are applying a header trick on OSv side to re-define MSG_DONTWAIT as 0 when compiling those specific musl sources.

Waldek