* Some parts are wrongly implemented, e.g., `PTRACE_GETREGS` and
`PTRACE_SETREGS` both do the same thing.
- * `return` values are wrong, e.g., `return EOPNOTSUPP` should instead
- set `errno = EOPNOTSUPP` and `return -1` in a few places (but not
- with the three `PTRACE_PEEK*` requests.
-
Also consider the `sysdeps/generic/sys/ptrace.h` and
`sysdeps/unix/sysv/linux/sys/ptrace.h` files.