diff options
Diffstat (limited to 'hurd')
| -rw-r--r-- | hurd/hurdfault.c | 22 |
1 files changed, 17 insertions, 5 deletions
diff --git a/hurd/hurdfault.c b/hurd/hurdfault.c index 2a30db085e..bb6fa9576d 100644 --- a/hurd/hurdfault.c +++ b/hurd/hurdfault.c @@ -113,6 +113,8 @@ _hurdsig_fault_init (void) struct machine_thread_state state; mach_port_t sigexc; + /* Allocate a port to receive signal thread exceptions. + We will move this receive right to the proc server. */ err = __mach_port_allocate (__mach_task_self (), MACH_PORT_RIGHT_RECEIVE, &sigexc); assert_perror (err); @@ -120,16 +122,20 @@ _hurdsig_fault_init (void) MACH_PORT_RIGHT_RECEIVE, &forward_sigexc); assert_perror (err); + /* Allocate a port to receive the exception msgs forwarded + from the proc server. */ err = __mach_port_insert_right (__mach_task_self (), sigexc, sigexc, MACH_MSG_TYPE_MAKE_SEND); assert_perror (err); -#if 0 /* XXX gdb bites */ - err = __thread_set_special_port (_hurd_msgport_thread, - THREAD_EXCEPTION_PORT, sigexc); -#endif - __mach_port_deallocate (__mach_task_self (), sigexc); + + /* Set the queue limit for this port to just one. The proc server will + notice if we ever get a second exception while one remains queued and + unreceived, and decide we are hopelessly buggy. */ + err = __mach_port_set_qlimit (__mach_task_self (), forward_sigexc, 1); assert_perror (err); + /* This state will be restored when we fault. + It runs the function above. */ memset (&state, 0, sizeof state); MACHINE_THREAD_STATE_SET_PC (&state, faulted); MACHINE_THREAD_STATE_SET_SP (&state, faultstack, sizeof faultstack); @@ -143,5 +149,11 @@ _hurdsig_fault_init (void) (natural_t *) &state, MACHINE_THREAD_STATE_COUNT)); assert_perror (err); + + /* Direct signal thread exceptions to the proc server. */ + err = __thread_set_special_port (_hurd_msgport_thread, + THREAD_EXCEPTION_PORT, sigexc); + __mach_port_deallocate (__mach_task_self (), sigexc); + assert_perror (err); } |