[lldb-dev] Linux/Posix spawning, signal masking
Todd Fiala
tfiala at google.com
Wed Jan 22 13:45:32 PST 2014
So I just about have this done (the original 3 steps, not switching to
fork()/exec()).
One thing I hit was an area I noticed yesterday: on Linux (x86_64, Ubuntu
12.04), I'm finding that I need to *not* take defaults for all the signal
handlers in lldb-gdbserver; otherwise, the target process never starts
operating. Technically the target process is exiting immediately with an
exit_state of 127 with signal = 0.
For the moment, I have that #ifdef'd in the Apple/Linux/FreeBSD
LaunchProcessPosixSpawn method so that only Linux doesn't reset the child
signal handlers to defaults. I'm thinking the FreeBSD/Apple BSD lineage
might behave more similarly here as my first stake in the sand for a guess,
but that would be changing behavior for FreeBSD. (Ed - any thoughts here?
I could just as well flip the #if defined(__linux__) to #if
!defined(__APPLE__).) Ultimately the root cause of this is not clear to me
yet.
For the directory handling, I'm having that handled via __pthread* methods
on Apple and continuing to do what it did before on everything else. I'll
look into the fork()/exec() option as a follow up after I work through some
of the more obviously broken bits of lldb-gdbserver.
See below for the current state of the patch. I'm about to run tests on
Ubuntu and try a build and tests on my MBP.
-Todd
On Wed, Jan 22, 2014 at 10:24 AM, Greg Clayton <gclayton at apple.com> wrote:
> You might need to add "#if defined(__APPLE__)" around the calls to
> __pthread_chdir and __pthread_fchdir. Those might be darwin specific.
>
> There is no way to set your current working directory when using
> posix_spawn, so to work around this, we change directory in a thread
> specific way by calling __pthread_chdir(working_dir) and reverting it using
> __pthread_fchdir(-1), so as to not hose over the process that has the lldb
> shared library loaded by changing the global working directory.
>
> So in order to eventually fix being able to obey the launch flag
> eLaunchFlagDebug and also to be able to set the working directory, non
> darwin builds might need to change over to using fork()/exec() since after
> the fork the child process can set its working directory and also call
> ptrace() to start being debuggable and then calling exec(). When ptrace()
> has been called to allow the process to be debugged, I believe it stops
> right at the entry point upon exec. Again, this would be for non-darwin
> builds since Apple has a posix_spawn flag of POSIX_SPAWN_START_SUSPENDED
> that can be set to enforce stopping at the entry point and also has the
> thread specific way to change directory.
>
> Greg
>
>
> On Jan 22, 2014, at 10:00 AM, Todd Fiala <tfiala at google.com> wrote:
>
> > Correct.
> >
> >
> > On Wed, Jan 22, 2014 at 9:55 AM, Greg Clayton <gclayton at apple.com>
> wrote:
> > So the fix will be:
> > 1 - Remove LaunchProcessPosixSpawn() from Host.mm
> > 2 - Copy it over into Host.cpp
> > 3 - Make sure LaunchProcessPosixSpawn is compiled for Apple builds as
> well in Host.cpp
> >
> > Right?
> >
> >
> > On Jan 22, 2014, at 9:54 AM, Todd Fiala <tfiala at google.com> wrote:
> >
> > > > It is indeed the right fix.
> > >
> > > Ok - I'll take care of that part. Thanks!
> > >
> > >
> > > On Wed, Jan 22, 2014 at 9:52 AM, Greg Clayton <gclayton at apple.com>
> wrote:
> > > It is indeed the right fix. Host.mm has a mac specific version which
> does this:
> > >
> > > sigset_t no_signals;
> > > sigset_t all_signals;
> > > sigemptyset (&no_signals);
> > > sigfillset (&all_signals);
> > > ::posix_spawnattr_setsigmask(&attr, &no_signals);
> > > ::posix_spawnattr_setsigdefault(&attr, &all_signals);
> > >
> > > Compared to the incorrect version you noticed in Host.cpp:
> > >
> > > sigset_t no_signals;
> > > sigset_t all_signals;
> > > sigemptyset (&no_signals);
> > > sigfillset (&all_signals);
> > > ::posix_spawnattr_setsigmask(&attr, &all_signals);
> > > ::posix_spawnattr_setsigdefault(&attr, &no_signals);
> > >
> > > (notice all_signals and no_signals are reversed in the last two
> function calls in Host.cpp.
> > >
> > > You might compare the "LaunchProcessPosixSpawn" in Host.mm and try and
> just copy it to Host.cpp and see if it works. I can't find anything darwin
> specific in the code after a quick glance and we have used the Host.mm
> LaunchProcessPosixSpawn() for a few years now, so it is definitely tested...
> > >
> > > So the fix would seem to be:
> > > 1 - Remove LaunchProcessPosixSpawn() from Host.mm
> > > 2 - Copy it over into Host.cpp
> > > 3 - Make sure LaunchProcessPosixSpawn is compiled for Apple builds as
> well in Host.cpp
> > >
> > >
> > > On Jan 21, 2014, at 10:49 PM, Todd Fiala <tfiala at google.com> wrote:
> > >
> > > > Hi all,
> > > >
> > > > In source/Host/common/Host.cpp, there is a posix process spawning
> method called LaunchProcessPosixSpawn. On my Linux system, it is used to
> start the target process in lldb-gdbserver. It looks like FreeBSD uses it
> as well. Most of the Platform launchers appear to funnel to it as well
> (via Host::LaunchProcess ()).
> > > >
> > > > There is a section of code in LaunchProcessPosixSpawn that masks all
> signals for the child process that is started up:
> > > >
> > > > ::posix_spawnattr_setsigmask(&attr, &all_signals)
> > > >
> > > > When that is set, it seems to be preventing the child from receiving
> everything except the non-blockable signals. This has the effect of (at
> the very least) blocking SIGINT (i.e. ^C from the keyboard) and SIGTERM
> (standard unadorned "kill pid"). This appears to be the cause of a few
> bugs as I try to get lldb-gdbserver working on Linux. For example:
> > > >
> > > > 1. hitting ^C on an lldb-gdbserver that spawned a debuggee target
> process would kill the lldb-gdbserver, but not the debuggee target, which
> continues to run.
> > > >
> > > > 2. sending a SIGTERM (kill {debuggee pid}) while it is getting
> debugged and running is ignored.
> > > >
> > > > 3. sending a SIGTERM to the debuggee after issue #1 (where
> lldb-gdbserver is no longer running) is ignored.
> > > >
> > > > 4. killing lldb-gdbserver from an attached lldb that shuts down and
> kills the remote does indeed kill lldb-gebserver, but does not kill the
> target process.
> > > >
> > > > (Of course sending a 'kill -9 {debuggee pid}' works fine to kill the
> target process).
> > > >
> > > >
> > > > I've modified this method locally to not mask any signals:
> > > >
> > > > ::posix_spawnattr_setsigmask (&attr, &no_signals)
> > > >
> > > > This seems to address all the problems I had above for
> lldb-gdbserver as signals propagate properly, and the target responds
> correctly to signals sent when the parent dies, etc.
> > > >
> > > > I've also run all the existing tests (on my system, that amounts to
> 275 tests that really run), and those are all passing.
> > > >
> > > > However, given that so much code flows through here (or at least
> appears to) that is not directly related to the lldb-gdbserver --- i.e.
> local linux/FreeBSD debugging --- I'm highly skeptical that this is the
> right fix. I did try using local debugging with lldb with my change in
> place, and that seemed to work fine. But I'm thinking that perhaps the
> signal blocking was intended and that behavior is needed in some cases that
> (perhaps) are not covered by tests that run on Linux.
> > > >
> > > > Any thoughts on why all the signals were getting masked on process
> spawning? Does that change look okay as is?
> > > >
> > > > Thanks!
> > > >
> > > > Sincerely,
> > > > Todd Fiala
> > > > _______________________________________________
> > > > lldb-dev mailing list
> > > > lldb-dev at cs.uiuc.edu
> > > > http://lists.cs.uiuc.edu/mailman/listinfo/lldb-dev
> > >
> > >
> > >
> > >
> > > --
> > > Todd Fiala | Software Engineer | tfiala at google.com |
> 650-943-3180
> > >
> >
> >
> >
> >
> > --
> > Todd Fiala | Software Engineer | tfiala at google.com |
> 650-943-3180
> >
>
>
--
Todd Fiala | Software Engineer | tfiala at google.com | 650-943-3180
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Index: source/Host/common/Host.cpp
===================================================================
--- source/Host/common/Host.cpp (revision 199814)
+++ source/Host/common/Host.cpp (working copy)
@@ -1637,10 +1637,234 @@
return error;
}
+
+// LaunchProcessPosixSpawn for Apple, Linux, FreeBSD and other GLIBC
+// systems
+
+#if defined(__APPLE__) || defined(__linux__) || defined(__FreeBSD__) || defined(__GLIBC__)
+
+static Error
+LaunchProcessPosixSpawn (const char *exe_path, ProcessLaunchInfo &launch_info, ::pid_t &pid)
+{
+ Error error;
+ Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_HOST | LIBLLDB_LOG_PROCESS));
+
+ posix_spawnattr_t attr;
+ error.SetError( ::posix_spawnattr_init (&attr), eErrorTypePOSIX);
+
+ if (error.Fail() || log)
+ error.PutToLog(log, "::posix_spawnattr_init ( &attr )");
+ if (error.Fail())
+ return error;
+
+ // Make a quick class that will cleanup the posix spawn attributes in case
+ // we return in the middle of this function.
+ lldb_utility::CleanUp <posix_spawnattr_t *, int> posix_spawnattr_cleanup(&attr, posix_spawnattr_destroy);
+
+ sigset_t no_signals;
+ sigset_t all_signals;
+ sigemptyset (&no_signals);
+ sigfillset (&all_signals);
+ ::posix_spawnattr_setsigmask(&attr, &no_signals);
+#if defined(__linux__)
+ ::posix_spawnattr_setsigdefault(&attr, &no_signals);
+#else
+ ::posix_spawnattr_setsigdefault(&attr, &all_signals);
+#endif
+
+ // TODO: consider hoisting GetPosixspawnFlags into common/Host.cpp
+#if defined(__APPLE__)
+ short flags = GetPosixspawnFlags(launch_info);
+#else
+ short flags = POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK;
+#endif
+
+ error.SetError( ::posix_spawnattr_setflags (&attr, flags), eErrorTypePOSIX);
+ if (error.Fail() || log)
+ error.PutToLog(log, "::posix_spawnattr_setflags ( &attr, flags=0x%8.8x )", flags);
+ if (error.Fail())
+ return error;
+
+ // posix_spawnattr_setbinpref_np appears to be an Apple extension per:
+ // http://www.unix.com/man-page/OSX/3/posix_spawnattr_setbinpref_np/
+#if defined(__APPLE__) && !defined(__arm__)
+
+ // We don't need to do this for ARM, and we really shouldn't now that we
+ // have multiple CPU subtypes and no posix_spawnattr call that allows us
+ // to set which CPU subtype to launch...
+ const ArchSpec &arch_spec = launch_info.GetArchitecture();
+ cpu_type_t cpu = arch_spec.GetMachOCPUType();
+ if (cpu != 0 &&
+ cpu != UINT32_MAX &&
+ cpu != LLDB_INVALID_CPUTYPE)
+ {
+ size_t ocount = 0;
+ error.SetError( ::posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &ocount), eErrorTypePOSIX);
+ if (error.Fail() || log)
+ error.PutToLog(log, "::posix_spawnattr_setbinpref_np ( &attr, 1, cpu_type = 0x%8.8x, count => %llu )", cpu, (uint64_t)ocount);
+
+ if (error.Fail() || ocount != 1)
+ return error;
+ }
+
+#endif
+
+ const char *tmp_argv[2];
+ char * const *argv = (char * const*)launch_info.GetArguments().GetConstArgumentVector();
+ char * const *envp = (char * const*)launch_info.GetEnvironmentEntries().GetConstArgumentVector();
+ if (argv == NULL)
+ {
+ // posix_spawn gets very unhappy if it doesn't have at least the program
+ // name in argv[0]. One of the side affects I have noticed is the environment
+ // variables don't make it into the child process if "argv == NULL"!!!
+ tmp_argv[0] = exe_path;
+ tmp_argv[1] = NULL;
+ argv = (char * const*)tmp_argv;
+ }
+
+#if !defined(__APPLE__)
+ // manage the working directory
+ char current_dir[PATH_MAX];
+ current_dir[0] = '\0';
+#endif
+
+ const char *working_dir = launch_info.GetWorkingDirectory();
+ if (working_dir)
+ {
+#if defined(__APPLE__)
+ // No more thread specific current working directory
+ if (__pthread_chdir (working_dir) < 0) {
+ if (errno == ENOENT) {
+ error.SetErrorStringWithFormat("No such file or directory: %s", working_dir);
+ } else if (errno == ENOTDIR) {
+ error.SetErrorStringWithFormat("Path doesn't name a directory: %s", working_dir);
+ } else {
+ error.SetErrorStringWithFormat("An unknown error occurred when changing directory for process execution.");
+ }
+ return error;
+ }
+#else
+ if (::getcwd(current_dir, sizeof(current_dir)) == NULL)
+ {
+ error.SetError(errno, eErrorTypePOSIX);
+ error.LogIfError(log, "unable to save the current directory");
+ return error;
+ }
+
+ if (::chdir(working_dir) == -1)
+ {
+ error.SetError(errno, eErrorTypePOSIX);
+ error.LogIfError(log, "unable to change working directory to %s", working_dir);
+ return error;
+ }
+#endif
+ }
+
+ const size_t num_file_actions = launch_info.GetNumFileActions ();
+ if (num_file_actions > 0)
+ {
+ posix_spawn_file_actions_t file_actions;
+ error.SetError( ::posix_spawn_file_actions_init (&file_actions), eErrorTypePOSIX);
+ if (error.Fail() || log)
+ error.PutToLog(log, "::posix_spawn_file_actions_init ( &file_actions )");
+ if (error.Fail())
+ return error;
+
+ // Make a quick class that will cleanup the posix spawn attributes in case
+ // we return in the middle of this function.
+ lldb_utility::CleanUp <posix_spawn_file_actions_t *, int> posix_spawn_file_actions_cleanup (&file_actions, posix_spawn_file_actions_destroy);
+
+ for (size_t i=0; i<num_file_actions; ++i)
+ {
+ const ProcessLaunchInfo::FileAction *launch_file_action = launch_info.GetFileActionAtIndex(i);
+ if (launch_file_action)
+ {
+ if (!ProcessLaunchInfo::FileAction::AddPosixSpawnFileAction (&file_actions,
+ launch_file_action,
+ log,
+ error))
+ return error;
+ }
+ }
+
+ error.SetError (::posix_spawnp (&pid,
+ exe_path,
+ &file_actions,
+ &attr,
+ argv,
+ envp),
+ eErrorTypePOSIX);
+
+ if (error.Fail() || log)
+ {
+ error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = %p, attr = %p, argv = %p, envp = %p )",
+ pid,
+ exe_path,
+ &file_actions,
+ &attr,
+ argv,
+ envp);
+ if (log)
+ {
+ for (int ii=0; argv[ii]; ++ii)
+ log->Printf("argv[%i] = '%s'", ii, argv[ii]);
+ }
+ }
+
+ }
+ else
+ {
+ error.SetError (::posix_spawnp (&pid,
+ exe_path,
+ NULL,
+ &attr,
+ argv,
+ envp),
+ eErrorTypePOSIX);
+
+ if (error.Fail() || log)
+ {
+ error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = NULL, attr = %p, argv = %p, envp = %p )",
+ pid,
+ exe_path,
+ &attr,
+ argv,
+ envp);
+ if (log)
+ {
+ for (int ii=0; argv[ii]; ++ii)
+ log->Printf("argv[%i] = '%s'", ii, argv[ii]);
+ }
+ }
+ }
+
+ if (working_dir)
+ {
+#if defined(__APPLE__)
+ // No more thread specific current working directory
+ __pthread_fchdir (-1);
+#else
+ if (::chdir(current_dir) == -1 && error.Success())
+ {
+ error.SetError(errno, eErrorTypePOSIX);
+ error.LogIfError(log, "unable to change current directory back to %s",
+ current_dir);
+ }
+#endif
+ }
+
+ return error;
+}
+
+#endif // LaunchProcedssPosixSpawn: Apple, Linux, FreeBSD and other GLIBC systems
+
+
#if defined(__linux__) || defined(__FreeBSD__) || defined(__GLIBC__)
// The functions below implement process launching via posix_spawn() for Linux
// and FreeBSD.
+#if 0 // ignore this implementation
+
// The posix_spawn() and posix_spawnp() functions first appeared in FreeBSD 8.0,
static Error
LaunchProcessPosixSpawn (const char *exe_path, ProcessLaunchInfo &launch_info, ::pid_t &pid)
@@ -1663,10 +1887,9 @@
lldb_utility::CleanUp <posix_spawnattr_t *, int> posix_spawnattr_cleanup(&attr, posix_spawnattr_destroy);
sigset_t no_signals;
- sigset_t all_signals;
sigemptyset (&no_signals);
- sigfillset (&all_signals);
- ::posix_spawnattr_setsigmask(&attr, &all_signals);
+
+ ::posix_spawnattr_setsigmask(&attr, &no_signals);
::posix_spawnattr_setsigdefault(&attr, &no_signals);
short flags = POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK;
@@ -1764,7 +1987,9 @@
return error;
}
+#endif // ignore implementation - pulling in Apple version
+
Error
Host::LaunchProcess (ProcessLaunchInfo &launch_info)
{
@@ -1815,6 +2040,8 @@
// If all went well, then set the process ID into the launch info
launch_info.SetProcessID(pid);
+ Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_PROCESS));
+
// Make sure we reap any processes we spawn or we will have zombies.
if (!launch_info.MonitorProcess())
{
@@ -1823,7 +2050,14 @@
NULL,
pid,
monitor_signals);
+ if (log)
+ log->PutCString ("monitored child process with default Process::SetProcessExitStatus.");
}
+ else
+ {
+ if (log)
+ log->PutCString ("monitored child process with user-specified process monitor.");
+ }
}
else
{
Index: source/Host/macosx/Host.mm
===================================================================
--- source/Host/macosx/Host.mm (revision 199814)
+++ source/Host/macosx/Host.mm (working copy)
@@ -1586,176 +1586,6 @@
#endif
}
-static Error
-LaunchProcessPosixSpawn (const char *exe_path, ProcessLaunchInfo &launch_info, ::pid_t &pid)
-{
- Error error;
- Log *log(lldb_private::GetLogIfAllCategoriesSet (LIBLLDB_LOG_HOST | LIBLLDB_LOG_PROCESS));
-
- posix_spawnattr_t attr;
- error.SetError( ::posix_spawnattr_init (&attr), eErrorTypePOSIX);
-
- if (error.Fail() || log)
- error.PutToLog(log, "::posix_spawnattr_init ( &attr )");
- if (error.Fail())
- return error;
-
- // Make a quick class that will cleanup the posix spawn attributes in case
- // we return in the middle of this function.
- lldb_utility::CleanUp <posix_spawnattr_t *, int> posix_spawnattr_cleanup(&attr, posix_spawnattr_destroy);
-
- sigset_t no_signals;
- sigset_t all_signals;
- sigemptyset (&no_signals);
- sigfillset (&all_signals);
- ::posix_spawnattr_setsigmask(&attr, &no_signals);
- ::posix_spawnattr_setsigdefault(&attr, &all_signals);
-
- short flags = GetPosixspawnFlags(launch_info);
- error.SetError( ::posix_spawnattr_setflags (&attr, flags), eErrorTypePOSIX);
- if (error.Fail() || log)
- error.PutToLog(log, "::posix_spawnattr_setflags ( &attr, flags=0x%8.8x )", flags);
- if (error.Fail())
- return error;
-
-#if !defined(__arm__)
-
- // We don't need to do this for ARM, and we really shouldn't now that we
- // have multiple CPU subtypes and no posix_spawnattr call that allows us
- // to set which CPU subtype to launch...
- const ArchSpec &arch_spec = launch_info.GetArchitecture();
- cpu_type_t cpu = arch_spec.GetMachOCPUType();
- if (cpu != 0 &&
- cpu != UINT32_MAX &&
- cpu != LLDB_INVALID_CPUTYPE)
- {
- size_t ocount = 0;
- error.SetError( ::posix_spawnattr_setbinpref_np (&attr, 1, &cpu, &ocount), eErrorTypePOSIX);
- if (error.Fail() || log)
- error.PutToLog(log, "::posix_spawnattr_setbinpref_np ( &attr, 1, cpu_type = 0x%8.8x, count => %llu )", cpu, (uint64_t)ocount);
-
- if (error.Fail() || ocount != 1)
- return error;
- }
-
-#endif
-
- const char *tmp_argv[2];
- char * const *argv = (char * const*)launch_info.GetArguments().GetConstArgumentVector();
- char * const *envp = (char * const*)launch_info.GetEnvironmentEntries().GetConstArgumentVector();
- if (argv == NULL)
- {
- // posix_spawn gets very unhappy if it doesn't have at least the program
- // name in argv[0]. One of the side affects I have noticed is the environment
- // variables don't make it into the child process if "argv == NULL"!!!
- tmp_argv[0] = exe_path;
- tmp_argv[1] = NULL;
- argv = (char * const*)tmp_argv;
- }
-
- const char *working_dir = launch_info.GetWorkingDirectory();
- if (working_dir)
- {
- // No more thread specific current working directory
- if (__pthread_chdir (working_dir) < 0) {
- if (errno == ENOENT) {
- error.SetErrorStringWithFormat("No such file or directory: %s", working_dir);
- } else if (errno == ENOTDIR) {
- error.SetErrorStringWithFormat("Path doesn't name a directory: %s", working_dir);
- } else {
- error.SetErrorStringWithFormat("An unknown error occurred when changing directory for process execution.");
- }
- return error;
- }
- }
-
- const size_t num_file_actions = launch_info.GetNumFileActions ();
- if (num_file_actions > 0)
- {
- posix_spawn_file_actions_t file_actions;
- error.SetError( ::posix_spawn_file_actions_init (&file_actions), eErrorTypePOSIX);
- if (error.Fail() || log)
- error.PutToLog(log, "::posix_spawn_file_actions_init ( &file_actions )");
- if (error.Fail())
- return error;
-
- // Make a quick class that will cleanup the posix spawn attributes in case
- // we return in the middle of this function.
- lldb_utility::CleanUp <posix_spawn_file_actions_t *, int> posix_spawn_file_actions_cleanup (&file_actions, posix_spawn_file_actions_destroy);
-
- for (size_t i=0; i<num_file_actions; ++i)
- {
- const ProcessLaunchInfo::FileAction *launch_file_action = launch_info.GetFileActionAtIndex(i);
- if (launch_file_action)
- {
- if (!ProcessLaunchInfo::FileAction::AddPosixSpawnFileAction (&file_actions,
- launch_file_action,
- log,
- error))
- return error;
- }
- }
-
- error.SetError (::posix_spawnp (&pid,
- exe_path,
- &file_actions,
- &attr,
- argv,
- envp),
- eErrorTypePOSIX);
-
- if (error.Fail() || log)
- {
- error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = %p, attr = %p, argv = %p, envp = %p )",
- pid,
- exe_path,
- &file_actions,
- &attr,
- argv,
- envp);
- if (log)
- {
- for (int ii=0; argv[ii]; ++ii)
- log->Printf("argv[%i] = '%s'", ii, argv[ii]);
- }
- }
-
- }
- else
- {
- error.SetError (::posix_spawnp (&pid,
- exe_path,
- NULL,
- &attr,
- argv,
- envp),
- eErrorTypePOSIX);
-
- if (error.Fail() || log)
- {
- error.PutToLog(log, "::posix_spawnp ( pid => %i, path = '%s', file_actions = NULL, attr = %p, argv = %p, envp = %p )",
- pid,
- exe_path,
- &attr,
- argv,
- envp);
- if (log)
- {
- for (int ii=0; argv[ii]; ++ii)
- log->Printf("argv[%i] = '%s'", ii, argv[ii]);
- }
- }
- }
-
- if (working_dir)
- {
- // No more thread specific current working directory
- __pthread_fchdir (-1);
- }
-
- return error;
-}
-
static bool
ShouldLaunchUsingXPC(ProcessLaunchInfo &launch_info)
{
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