Get any process in gdb by pid

sys/debug/__init__.py

@@ -5,7 +5,7 @@
 from .kgmon import Kgmon
 from .klog import Klog
 from .ktrace import Ktrace
-from .proc import Kprocess, Process, CurrentProcess
+from .proc import Kprocess, Process, ShowProcess
 from .struct import BinTime
 from .sync import CondVar, Mutex
 from .thread import Kthread, Thread, CurrentThread
@@ -35,7 +35,7 @@ def addPrettyPrinters():
 
 # Functions
 CurrentThread()
-CurrentProcess()
+ShowProcess()
 
 # Events
 gdb.events.stop.connect(stop_handler)

sys/debug/proc.py

@@ -22,6 +22,15 @@ def from_current(cls):
     def from_pointer(cls, ptr):
         return cls(gdb.parse_and_eval('(struct proc *)' + ptr).dereference())
 
+    @classmethod
+    def from_pid(cls, pid):
+        alive = list(TailQueue(global_var('proc_list'), 'p_all'))
+        dead = list(TailQueue(global_var('zombie_list'), 'p_all'))
+        for p in alive + dead:
+            if p['p_pid'] == pid:
+                return cls(p)
+        return None
+
     @classmethod
     def list_all(cls):
         alive = TailQueue(global_var('proc_list'), 'p_all')
@@ -31,6 +40,9 @@ def list_all(cls):
     def __repr__(self):
         return 'proc{pid=%d}' % self.p_pid
 
+    def address(self):
+        return self._obj.address
+
 
 class Kprocess(SimpleCommand):
     """List all processes."""
@@ -47,11 +59,17 @@ def __call__(self, args):
         print(table)
 
 
-class CurrentProcess(gdb.Function):
-    """Return address of currently running process."""
+class ShowProcess(gdb.Function):
+    """Return address of process of given pid (default current process)."""
 
     def __init__(self):
-        super().__init__('process')
-
-    def invoke(self):
-        return Process.current()
+        super().__init__('proc')
+
+    def invoke(self, pid=-1):
+        if pid == -1:
+            return Process.current()
+        p = Process.from_pid(pid)
+        if p:
+            return p.address()
+        print(f"No process of pid={pid}")
+        return 0