commit 175fde6c4a92e1b52f060ef82baf35bf7d722639 Author: Damian Johnson atagar@torproject.org Date: Mon May 2 21:28:54 2011 -0700

Determining initial cmd with ctypes rather than ps

Using the ctypes argv rather than querying for our command via ps (thanks to ioerror). --- src/util/procname.py | 28 +++++++++++----------------- 1 files changed, 11 insertions(+), 17 deletions(-)

diff --git a/src/util/procname.py b/src/util/procname.py index 14a82b8..97dc707 100644 --- a/src/util/procname.py +++ b/src/util/procname.py @@ -9,13 +9,10 @@ # argument replacement (ie, replace argv[0], argv[1], etc but with a string # the same size).

-import os import sys import ctypes import ctypes.util

-from util import sysTools - # flag for setting the process name, found in '/usr/include/linux/prctl.h' PR_SET_NAME = 15

@@ -65,24 +62,21 @@ def _setArgv(processName): if currentProcessName == None: # Getting argv via... # currentProcessName = " ".join(["python"] + sys.argv) - # + # # doesn't do the trick since this will miss interpretor arguments like... # python -W ignore::DeprecationWarning myScript.py # - # hence simply getting an outside opinion of our command. - - psResults = sysTools.call("ps -p %i -o args" % os.getpid()) + # Hence we're fetching this via our ctypes argv. Alternatively we could + # use ps, though this is less desirable: + # "ps -p %i -o args" % os.getpid()

- if len(psResults) == 2: - # output looks like: - # COMMAND - # python ./src/starter.py - - currentProcessName = psResults[1] - maxNameLength = len(currentProcessName) + args = [] + for i in range(100): + if argc[i] == None: break + args.append(str(argc[i]))

- if not currentProcessName: - raise IOError("unable to determine our process name") + currentProcessName = " ".join(args) + maxNameLength = len(currentProcessName)

if len(processName) > maxNameLength: msg = "can't rename process to something longer than our initial name since this would overwrite memory used for the env" @@ -93,7 +87,7 @@ def _setArgv(processName):

ctypes.memset(argc.contents, 0, zeroSize + 1) # null terminate the string's end ctypes.memmove(argc.contents, processName, len(processName)) - currentProcessName = processName[:MAX_CHAR] + currentProcessName = processName

def _setPrctlName(processName): """