mirror of
git://projects.qi-hardware.com/openwrt-xburst.git
synced 2024-11-25 02:30:38 +02:00
e772a8b1a3
git-svn-id: svn://svn.openwrt.org/openwrt/trunk/openwrt@1166 3c298f89-4303-0410-b956-a3cf2f4a3e73
226 lines
7.2 KiB
Diff
226 lines
7.2 KiB
Diff
Status: submitted for comments
|
|
|
|
2004-11-12 Daniel Jacobowitz <dan@debian.org>
|
|
|
|
* linux-nat.c (my_waitpid): New function.
|
|
(linux_test_for_tracefork): Make more robust and verbose. Take
|
|
an ORIGINAL_PID argument and test for PTRACE_SETOPTIONS first.
|
|
(linux_supports_tracefork, linux_supports_tracevforkdone): Take a PID
|
|
argument. Update calls to linux_test_for_tracefork.
|
|
(linux_enable_event_reporting, child_follow_fork)
|
|
(child_insert_fork_catchpoint, child_insert_vfork_catchpoint)
|
|
(child_insert_exec_catchpoint): Update calls to
|
|
linux_supports_tracefork and linux_supports_tracevforkdone.
|
|
|
|
Index: gdb-6.3/gdb/linux-nat.c
|
|
===================================================================
|
|
--- gdb-6.3.orig/gdb/linux-nat.c 2004-10-08 16:29:47.000000000 -0400
|
|
+++ gdb-6.3/gdb/linux-nat.c 2004-11-13 16:41:51.368720845 -0500
|
|
@@ -150,18 +150,47 @@ linux_tracefork_child (void)
|
|
exit (0);
|
|
}
|
|
|
|
-/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events. We
|
|
+/* Wrapper function for waitpid which handles EINTR. */
|
|
+
|
|
+static int
|
|
+my_waitpid (int pid, int *status, int flags)
|
|
+{
|
|
+ int ret;
|
|
+ do
|
|
+ {
|
|
+ ret = waitpid (pid, status, flags);
|
|
+ }
|
|
+ while (ret == -1 && errno == EINTR);
|
|
+
|
|
+ return ret;
|
|
+}
|
|
+
|
|
+/* Determine if PTRACE_O_TRACEFORK can be used to follow fork events.
|
|
+
|
|
+ First, we try to enable fork tracing on ORIGINAL_PID. If this fails,
|
|
+ we know that the feature is not available. This may change the tracing
|
|
+ options for ORIGINAL_PID, but we'll be setting them shortly anyway.
|
|
+
|
|
+ However, if it succeeds, we don't know for sure that the feature is
|
|
+ available; old versions of PTRACE_SETOPTIONS ignored unknown options. We
|
|
create a child process, attach to it, use PTRACE_SETOPTIONS to enable
|
|
- fork tracing, and let it fork. If the process exits, we assume that
|
|
- we can't use TRACEFORK; if we get the fork notification, and we can
|
|
- extract the new child's PID, then we assume that we can. */
|
|
+ fork tracing, and let it fork. If the process exits, we assume that we
|
|
+ can't use TRACEFORK; if we get the fork notification, and we can extract
|
|
+ the new child's PID, then we assume that we can. */
|
|
|
|
static void
|
|
-linux_test_for_tracefork (void)
|
|
+linux_test_for_tracefork (int original_pid)
|
|
{
|
|
int child_pid, ret, status;
|
|
long second_pid;
|
|
|
|
+ linux_supports_tracefork_flag = 0;
|
|
+ linux_supports_tracevforkdone_flag = 0;
|
|
+
|
|
+ ret = ptrace (PTRACE_SETOPTIONS, original_pid, 0, PTRACE_O_TRACEFORK);
|
|
+ if (ret != 0)
|
|
+ return;
|
|
+
|
|
child_pid = fork ();
|
|
if (child_pid == -1)
|
|
perror_with_name ("linux_test_for_tracefork: fork");
|
|
@@ -169,7 +198,7 @@ linux_test_for_tracefork (void)
|
|
if (child_pid == 0)
|
|
linux_tracefork_child ();
|
|
|
|
- ret = waitpid (child_pid, &status, 0);
|
|
+ ret = my_waitpid (child_pid, &status, 0);
|
|
if (ret == -1)
|
|
perror_with_name ("linux_test_for_tracefork: waitpid");
|
|
else if (ret != child_pid)
|
|
@@ -177,13 +206,23 @@ linux_test_for_tracefork (void)
|
|
if (! WIFSTOPPED (status))
|
|
error ("linux_test_for_tracefork: waitpid: unexpected status %d.", status);
|
|
|
|
- linux_supports_tracefork_flag = 0;
|
|
-
|
|
ret = ptrace (PTRACE_SETOPTIONS, child_pid, 0, PTRACE_O_TRACEFORK);
|
|
if (ret != 0)
|
|
{
|
|
- ptrace (PTRACE_KILL, child_pid, 0, 0);
|
|
- waitpid (child_pid, &status, 0);
|
|
+ ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
|
|
+ if (ret != 0)
|
|
+ {
|
|
+ warning ("linux_test_for_tracefork: failed to kill child");
|
|
+ return;
|
|
+ }
|
|
+
|
|
+ ret = my_waitpid (child_pid, &status, 0);
|
|
+ if (ret != child_pid)
|
|
+ warning ("linux_test_for_tracefork: failed to wait for killed child");
|
|
+ else if (!WIFSIGNALED (status))
|
|
+ warning ("linux_test_for_tracefork: unexpected wait status 0x%x from "
|
|
+ "killed child", status);
|
|
+
|
|
return;
|
|
}
|
|
|
|
@@ -192,8 +231,12 @@ linux_test_for_tracefork (void)
|
|
PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORKDONE);
|
|
linux_supports_tracevforkdone_flag = (ret == 0);
|
|
|
|
- ptrace (PTRACE_CONT, child_pid, 0, 0);
|
|
- ret = waitpid (child_pid, &status, 0);
|
|
+ ret = ptrace (PTRACE_CONT, child_pid, 0, 0);
|
|
+ if (ret != 0)
|
|
+ warning ("linux_test_for_tracefork: failed to resume child");
|
|
+
|
|
+ ret = my_waitpid (child_pid, &status, 0);
|
|
+
|
|
if (ret == child_pid && WIFSTOPPED (status)
|
|
&& status >> 16 == PTRACE_EVENT_FORK)
|
|
{
|
|
@@ -204,34 +247,38 @@ linux_test_for_tracefork (void)
|
|
int second_status;
|
|
|
|
linux_supports_tracefork_flag = 1;
|
|
- waitpid (second_pid, &second_status, 0);
|
|
- ptrace (PTRACE_DETACH, second_pid, 0, 0);
|
|
+ my_waitpid (second_pid, &second_status, 0);
|
|
+ ret = ptrace (PTRACE_KILL, second_pid, 0, 0);
|
|
+ if (ret != 0)
|
|
+ warning ("linux_test_for_tracefork: failed to kill second child");
|
|
}
|
|
}
|
|
+ else
|
|
+ warning ("linux_test_for_tracefork: unexpected result from waitpid "
|
|
+ "(%d, status 0x%x)", ret, status);
|
|
|
|
- if (WIFSTOPPED (status))
|
|
- {
|
|
- ptrace (PTRACE_DETACH, child_pid, 0, 0);
|
|
- waitpid (child_pid, &status, 0);
|
|
- }
|
|
+ ret = ptrace (PTRACE_KILL, child_pid, 0, 0);
|
|
+ if (ret != 0)
|
|
+ warning ("linux_test_for_tracefork: failed to kill child");
|
|
+ my_waitpid (child_pid, &status, 0);
|
|
}
|
|
|
|
/* Return non-zero iff we have tracefork functionality available.
|
|
This function also sets linux_supports_tracefork_flag. */
|
|
|
|
static int
|
|
-linux_supports_tracefork (void)
|
|
+linux_supports_tracefork (int pid)
|
|
{
|
|
if (linux_supports_tracefork_flag == -1)
|
|
- linux_test_for_tracefork ();
|
|
+ linux_test_for_tracefork (pid);
|
|
return linux_supports_tracefork_flag;
|
|
}
|
|
|
|
static int
|
|
-linux_supports_tracevforkdone (void)
|
|
+linux_supports_tracevforkdone (int pid)
|
|
{
|
|
if (linux_supports_tracefork_flag == -1)
|
|
- linux_test_for_tracefork ();
|
|
+ linux_test_for_tracefork (pid);
|
|
return linux_supports_tracevforkdone_flag;
|
|
}
|
|
|
|
@@ -242,12 +289,12 @@ linux_enable_event_reporting (ptid_t pti
|
|
int pid = ptid_get_pid (ptid);
|
|
int options;
|
|
|
|
- if (! linux_supports_tracefork ())
|
|
+ if (! linux_supports_tracefork (pid))
|
|
return;
|
|
|
|
options = PTRACE_O_TRACEFORK | PTRACE_O_TRACEVFORK | PTRACE_O_TRACEEXEC
|
|
| PTRACE_O_TRACECLONE;
|
|
- if (linux_supports_tracevforkdone ())
|
|
+ if (linux_supports_tracevforkdone (pid))
|
|
options |= PTRACE_O_TRACEVFORKDONE;
|
|
|
|
/* Do not enable PTRACE_O_TRACEEXIT until GDB is more prepared to support
|
|
@@ -308,7 +355,8 @@ child_follow_fork (int follow_child)
|
|
|
|
if (has_vforked)
|
|
{
|
|
- if (linux_supports_tracevforkdone ())
|
|
+ gdb_assert (linux_supports_tracefork_flag >= 0);
|
|
+ if (linux_supports_tracevforkdone (0))
|
|
{
|
|
int status;
|
|
|
|
@@ -476,7 +524,7 @@ linux_handle_extended_wait (int pid, int
|
|
int
|
|
child_insert_fork_catchpoint (int pid)
|
|
{
|
|
- if (! linux_supports_tracefork ())
|
|
+ if (! linux_supports_tracefork (pid))
|
|
error ("Your system does not support fork catchpoints.");
|
|
|
|
return 0;
|
|
@@ -485,7 +533,7 @@ child_insert_fork_catchpoint (int pid)
|
|
int
|
|
child_insert_vfork_catchpoint (int pid)
|
|
{
|
|
- if (!linux_supports_tracefork ())
|
|
+ if (!linux_supports_tracefork (pid))
|
|
error ("Your system does not support vfork catchpoints.");
|
|
|
|
return 0;
|
|
@@ -494,7 +542,7 @@ child_insert_vfork_catchpoint (int pid)
|
|
int
|
|
child_insert_exec_catchpoint (int pid)
|
|
{
|
|
- if (!linux_supports_tracefork ())
|
|
+ if (!linux_supports_tracefork (pid))
|
|
error ("Your system does not support exec catchpoints.");
|
|
|
|
return 0;
|