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[[!meta title="glibc: ptrace"]]
[[!tag open_issue_glibc]]
`ptrace` has some issues (`sysdeps/mach/hurd/ptrace.c`).
* Our implementation (and the generic one in `misc/ptrace.c`) differ
from the Linux one (`sysdeps/unix/sysv/linux/ptrace.c`)
w.r.t. handling of...
* the third argument: `int data` vs. `void *data`;
* `void *addr2` -- Linux doesn't have this, but we provide some
additional functionalty using this;
* function declaration: Linux has **`long`** `int ptrace (enum
__ptrace_request __request, ...)` **`__THROW`**, we have `int ptrace
(enum __ptrace_request __request, ...)`;
* interface do differ, e.g., Linux' `PTRACE_GETREGS` uses `void
*data`, we use `void *addr` for returning the struct, and in
Linux this is a `struct user_regs_struct` from `linux/user.h`,
and for us it is a `struct i386_thread_state` from
`mach/i386/thread_status.h`;
* Linux probides some functionality that we don't provide, e.g.,
`PTRACE_SINGLESTEP`.
* 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.
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