x/sys/unix: missing macOS/darwin support for GetsockoptUcred

[dezzeus]

I tried to use the GetsockoptUcred method on MacOS to get the unix.Ucred of the peer on the other side of a UNIX socket, as it was reported on the doc as being available on the x/sys/unix package, but I later discovered that it seems to be implemented only for Linux.

[gabyhelp]

Related Issues

• x/sys/unix: Enable pid lookup of unix socket peer for darwin #27613 (closed)
• x/sys/unix: UnixCredentials etc. missing on FreeBSD #51711
• x/sys/unix: want more platform support for UNIX domain socket peer credentials #41659
• syscall interface missing GetsockoptUcred #3836 (closed)
• Cannot set SO_PASSCRED for a net.UnixConn #36293 (closed)

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[prattmic]

I believe you are looking for GetsockoptXucred. Darwin has different socket options and types, but I think LOCAL_PEERCRED with Xucred is similar to Linux's SO_PEERCRED.

it was reported on the doc as being available on the x/sys/unix package

Note that https://pkg.go.dev/golang.org/x/sys/unix displays documentation for linux/amd64 by default (see "Build Context"). The top of the "Documentation" has a dropdown where you can select darwin documentation.