summaryrefslogtreecommitdiff
path: root/open_issues/glibc_ptrace.mdwn
blob: 7ca070775399893d36baf4dece9e357174fa74b6 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
[[!meta copyright="Copyright © 2009, 2012 Free Software Foundation, Inc."]]

[[!meta license="""[[!toggle id="license" text="GFDL 1.2+"]][[!toggleable
id="license" text="Permission is granted to copy, distribute and/or modify this
document under the terms of the GNU Free Documentation License, Version 1.2 or
any later version published by the Free Software Foundation; with no Invariant
Sections, no Front-Cover Texts, and no Back-Cover Texts.  A copy of the license
is included in the section entitled [[GNU Free Documentation
License|/fdl]]."]]"""]]

[[!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 provides some functionality that we don't provide:
        `PTRACE_GETFPXREGS` , `PTRACE_SINGLESTEP`.

  * Some parts are wrongly implemented, e.g., `PTRACE_GETREGS` and
    `PTRACE_SETREGS` both do the same thing.

Also consider the `sysdeps/generic/sys/ptrace.h` and
`sysdeps/unix/sysv/linux/sys/ptrace.h` files.