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darwin: warning resuming inferior after attach

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This patch avoids a warning when resuming the execution of a program
that we attached to. For instance:

    (gdb) attach 29989
    (gdb) continue
    Continuing.
    warning: Mach error at "/[...]/darwin-nat.c:738" in function
             "darwin_resume_thread": (os/kern) failure (0x5)

The warning is relatively harmless, but worrisome for the average
user.  The warning comes from the fact that darwin_wait recorded
that the fake stop event corresponding to the suspend action was
caused by the main thread being suspended on a SIGTRAP. As a result
of this, when resuming the program's execution, we try to resume
the thread's execution as well.  This is where the issue occurs,
as the thread was not in fact suspended, thus triggering the warning.

gdb/ChangeLog:

        * darwin-nat.c (darwin_setup_fake_stop_event): New function.
        (darwin_attach): Adjust using darwin_setup_fake_stop_event.
This commit is contained in:
Joel Brobecker 2013-05-06 12:41:14 +00:00
parent c8c9911faa
commit 726ce67c26
2 changed files with 33 additions and 2 deletions
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5
gdb/ChangeLog
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@ -1,3 +1,8 @@
2013-05-06 Joel Brobecker <brobecker@adacore.com>
* darwin-nat.c (darwin_setup_fake_stop_event): New function.
(darwin_attach): Adjust using darwin_setup_fake_stop_event.
2013-05-06 Joel Brobecker <brobecker@adacore.com>
* darwin-nat.c: Replace all "%x" instances in format strings

30
gdb/darwin-nat.c
View File

@ -1586,6 +1586,32 @@ darwin_create_inferior (struct target_ops *ops, char *exec_file,
}
/* Set things up such that the next call to darwin_wait will immediately
return a fake stop event for inferior INF.
This assumes that the inferior's thread list has been initialized,
as it will suspend the inferior's first thread. */
static void
darwin_setup_fake_stop_event (struct inferior *inf)
{
darwin_thread_t *thread;
kern_return_t kret;
gdb_assert (darwin_inf_fake_stop == NULL);
darwin_inf_fake_stop = inf;
/* When detecting a fake pending stop event, darwin_wait returns
an event saying that the first thread is in a DARWIN_STOPPED
state. To make that accurate, we need to suspend that thread
as well. Otherwise, we'll try resuming it when resuming the
inferior, and get a warning because the thread's suspend count
is already zero, making the resume request useless. */
thread = VEC_index (darwin_thread_t, inf->private->threads, 0);
kret = thread_suspend (thread->gdb_port);
MACH_CHECK_ERROR (kret);
}
/* Attach to process PID, then initialize for debugging it
and wait for the trace-trap that results from attaching. */
static void
@ -1637,8 +1663,8 @@ darwin_attach (struct target_ops *ops, char *args, int from_tty)
darwin_check_osabi (inf->private, ptid_get_tid (inferior_ptid));
gdb_assert (darwin_inf_fake_stop == NULL);
darwin_inf_fake_stop = inf;
darwin_setup_fake_stop_event (inf);
inf->private->no_ptrace = 1;
}