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Darwin/detach: Do not resume inferior after ptrace detach 

When trying to detach from an inferior that we start from the debugger,
GDB prints the following warning:

    (gdb) detach
    Detaching from program: /[...]/foo, process 74593
    warning: Mach error at "/[...]/darwin-nat.c:445" in function "darwin_resume_inferior": (os/kern) failure (0x5)

The warning comes from the following code in darwin_detach:

     darwin_resume_inferior (inf);

This is because the process has already been resumed by the
PT_DETACH ptrace operation that has just been performed.

On the other hand, when trying to detach from an inferior that
was started outside of debugger control (thus after having attached
the debugger to that inferior), things go smoothly.  That's because
we don't use ptrace to control the process in that case, and so
the resume is perfectly justified.

This patch makes sure that we resume the inferior during the detach
only when we're NOT using ptrace.

gdb/ChangeLog:

        * darwin-nat.c (darwin_detach): Call darwin_resume_inferior
        only when inf->private->no_ptrace.
This commit is contained in:
Joel Brobecker 2011-07-01 18:36:12 +00:00
parent 00eb2c4ae8
commit 5e9bc145ee
2 changed files with 10 additions and 1 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2011-07-01 Joel Brobecker <brobecker@adacore.com>
* darwin-nat.c (darwin_detach): Call darwin_resume_inferior
only when inf->private->no_ptrace.
2011-07-01 Joel Brobecker <brobecker@adacore.com>
* ada-lang.c (print_it_exception): Print temporary catchpoints

6
gdb/darwin-nat.c
View File

@ -1601,7 +1601,11 @@ darwin_detach (struct target_ops *ops, char *args, int from_tty)
darwin_reply_to_all_pending_messages (inf);
darwin_resume_inferior (inf);
/* When using ptrace, we have just performed a PT_DETACH, which
resumes the inferior. On the other hand, when we are not using
ptrace, we need to resume its execution ourselves. */
if (inf->private->no_ptrace)
darwin_resume_inferior (inf);
darwin_mourn_inferior (ops);
}