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authorSamuel Thibault <samuel.thibault@ens-lyon.org>2015-02-18 00:58:35 +0100
committerSamuel Thibault <samuel.thibault@ens-lyon.org>2015-02-18 00:58:35 +0100
commit49a086299e047b18280457b654790ef4a2e5abfa (patch)
treec2b29e0734d560ce4f58c6945390650b5cac8a1b /open_issues/glibc_ptrace.mdwn
parente2b3602ea241cd0f6bc3db88bf055bee459028b6 (diff)
Revert "rename open_issues.mdwn to service_solahart_jakarta_selatan__082122541663.mdwn"
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+[[!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.