Closed
Description
I'm attempting to use psutil to determine when it's reasonable to spawn extra simulators for my work (too many simulations at once == using swap which slows things down). However, I'm getting a permissions error on the child process.
uname -a = Darwin XXX.local 13.4.0 Darwin Kernel Version 13.4.0: Mon Jan 11 18:17:34 PST 2016; root:xnu-2422.115.15~1/RELEASE_X86_64 x86_64
OS X 10.9.5
Python 3.4.5 (default, Jun 27 2016, 12:04:15)
[GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.57)] on darwin
Type "help", "copyright", "credits" or "license" for more information
psutil.__version__ == 4.3.1
Here are the steps to reproduce:
- Copy the code below to a file named
sleeper.c
#include <stdlib.h>
#include <unistd.h>
int main(void)
{
sleep(1000);
return EXIT_SUCCESS;
}- Compile it using
clang -Wall -Wextra -pedantic -std=c11 sleeper.c, and let the output file be nameda.out. - Copy the code below to a file named
ps_test.pyin the same directory assleeper.c.
import os
import os.path
import psutil
path = os.path.realpath(os.path.join(os.path.curdir, 'a.out'))
child = os.spawnl(os.P_NOWAIT, path)
process = psutil.Process(pid=child)
print(process.memory_info())- Run the python script as
python ps_test.py.
Doing the above will result in the following:
Traceback (most recent call last):
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/psutil/_psosx.py", line 244, in wrapper
return fun(self, *args, **kwargs)
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/psutil/_psosx.py", line 317, in memory_info
rss, vms, pfaults, pageins = cext.proc_memory_info(self.pid)
PermissionError: [Errno 13] Permission denied
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "ps_test.py", line 8, in <module>
print(process.memory_info())
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/psutil/__init__.py", line 998, in memory_info
return self._proc.memory_info()
File "/opt/local/Library/Frameworks/Python.framework/Versions/3.4/lib/python3.4/site-packages/psutil/_psosx.py", line 252, in wrapper
raise AccessDenied(self.pid, self._name)
psutil.AccessDenied: psutil.AccessDenied (pid=94444)