From cc016cb69f23f068b2bb2eb009346df407c287bb Mon Sep 17 00:00:00 2001
From: Asger Hautop Drewsen <asgerdrewsen@gmail.com>
Date: Mon, 2 Mar 2015 01:15:46 +0100
Subject: [PATCH 1/3] Get args from manpages for auto-generated tracer

---
 src/frida/tracer.py | 29 +++++++++++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/src/frida/tracer.py b/src/frida/tracer.py
index b24ab4b..e74ff2a 100644
--- a/src/frida/tracer.py
+++ b/src/frida/tracer.py
@@ -5,6 +5,7 @@ import fnmatch
 import time
 import re
 import binascii
+import subprocess
 
 from frida.core import ModuleFunction
 
@@ -308,6 +309,30 @@ class Repository(object):
             self._on_update_callback(function, handler, source)
 
     def _create_stub_handler(self, function):
+        args = ""
+        argc = 0
+        varargs = False
+        try:
+            output = subprocess.check_output(["man", "-P", "col -b", "2", function.name], stderr=subprocess.DEVNULL)
+            match = re.search(r"^SYNOPSIS(?:.|\n)*?((?:^.+$\n)* {5}" + function.name + r"\(.*\n(^.+$\n)*)(?:.|\n)*^DESCRIPTION", output.decode(), re.MULTILINE)
+            if match:
+                decl = match.group(1)
+                for argm in re.finditer(r"([^* ]*)\s*(,|\))", decl):
+                    arg = argm.group(1)
+                    if arg == '...':
+                        args += '+ ", ..."'
+                        varargs = True
+                        continue
+
+                    args += '%(pre)s%(arg)s=" + args[%(argc)s]' % {"arg": arg, "argc": argc, "pre": '"' if argc == 0 else '+ ", '}
+                    argc += 1
+
+        except subprocess.CalledProcessError:
+            pass
+
+        if args == "":
+            args = '""'
+
         return """\
 /*
  * Auto-generated by Frida. Please modify to match the signature of %(name)s.
@@ -332,7 +357,7 @@ class Repository(object):
      * use "this" which is an object for keeping state local to an invocation.
      */
     onEnter: function onEnter(log, args, state) {
-        log("%(name)s()");
+        log("%(name)s(" + %(args)s + ")");
     },
 
     /**
@@ -348,7 +373,7 @@ class Repository(object):
     onLeave: function onLeave(log, retval, state) {
     }
 }
-""" % { 'name': function.name }
+""" % { "name": function.name, "args": args }
 
 class MemoryRepository(Repository):
     def __init__(self):

From 0fdc964480a77f224bb1f8c10e305650a9a77b9a Mon Sep 17 00:00:00 2001
From: Asger Hautop Drewsen <asgerdrewsen@gmail.com>
Date: Mon, 2 Mar 2015 16:49:00 +0100
Subject: [PATCH 2/3] Also catch OSError

---
 src/frida/tracer.py | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/frida/tracer.py b/src/frida/tracer.py
index e74ff2a..bed941d 100644
--- a/src/frida/tracer.py
+++ b/src/frida/tracer.py
@@ -327,7 +327,7 @@ class Repository(object):
                     args += '%(pre)s%(arg)s=" + args[%(argc)s]' % {"arg": arg, "argc": argc, "pre": '"' if argc == 0 else '+ ", '}
                     argc += 1
 
-        except subprocess.CalledProcessError:
+        except (subprocess.CalledProcessError, OSError): # WindowError or FileNotFoundError
             pass
 
         if args == "":

From a0bb52fc0ec88a51a6c37ded6b8ddb2239ad025c Mon Sep 17 00:00:00 2001
From: Asger Hautop Drewsen <asgerdrewsen@gmail.com>
Date: Mon, 2 Mar 2015 17:23:48 +0100
Subject: [PATCH 3/3] Use os.devnull instead of subprocess.DEVNULL

---
 src/frida/tracer.py | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/frida/tracer.py b/src/frida/tracer.py
index bed941d..dbd59c8 100644
--- a/src/frida/tracer.py
+++ b/src/frida/tracer.py
@@ -313,7 +313,8 @@ class Repository(object):
         argc = 0
         varargs = False
         try:
-            output = subprocess.check_output(["man", "-P", "col -b", "2", function.name], stderr=subprocess.DEVNULL)
+            with open(os.devnull, 'w') as devnull:
+                output = subprocess.check_output(["man", "-P", "col -b", "2", function.name], stderr=devnull)
             match = re.search(r"^SYNOPSIS(?:.|\n)*?((?:^.+$\n)* {5}" + function.name + r"\(.*\n(^.+$\n)*)(?:.|\n)*^DESCRIPTION", output.decode(), re.MULTILINE)
             if match:
                 decl = match.group(1)