whishlist: mark "API to determine the parent process ID of a pidfd" as done

Signed-off-by: Christian Brauner <[email protected]>

Author: brauner

README.md

@@ -614,6 +614,8 @@ identify, track and compare process even after they ceased to exist.
 
 ### API to determine the parent process ID of a pidfd
 
+[x] API to determine the parent process ID of a pidfd
+
 An API to determine the parent process ID (ppid) of a pidfd would be
 good.
 
@@ -623,6 +625,8 @@ the ppid of a pidfd matches the process own pid it can call
 would fail. It would be very useful if this could be determined
 easily before even calling that syscall.
 
+**🙇 `cdda1f26e74b ("pidfd: add ioctl to retrieve pid info")` 🙇**
+
 **Usecase:** systemd manages a multitude of processes, most of which
 are its own children, but many which are not. It would be great if
 we could easily determine whether it is worth waiting for