Re: task_for_pid never returns KERN_SUCCESS, any ideas?
Re: task_for_pid never returns KERN_SUCCESS, any ideas?
- Subject: Re: task_for_pid never returns KERN_SUCCESS, any ideas?
- From: Gary Fung <email@hidden>
- Date: Mon, 12 Jan 2009 14:23:27 -0500
Jean-Daniel Dupas wrote:
Le 12 janv. 09 à 19:37, Gary Fung a écrit :
Jason Coco wrote:
On Jan 12, 2009, at 12:54 , Gary Fung wrote:
Tried to retrieve task_info_t by using task_for_pid but the
following code does not equate to true
task_t task = MACH_PORT_NULL;
struct task_basic_info tinf;
if(task_for_pid(mach_task_self(), pid, &task) == KERN_SUCCESS) {
... //not reached
}
mach_task_self returns non null value so that should be ok. But
task_for_pid does not return anything for &task. Any ideas? I've
iterated through all the pids currently running, same result. Ran it
on Leopard.
task_for_pid() requires special privileges to execute. Instead of
testing for KERN_SUCCESS in the future, I suggest using a variable to
test, then you can see exactly what failed (in this case, you will
not
have privileges to execute it).
The easiest way to deal with this (although, probably not the best
way) is to execute the application as root. You can see the man page
for taskgated(8) for more information on task_for_pid() and its
security issues.
Jason
It returns 5 for all pids, which is a KERN_FAILURE correct? This
doesn't provide much information at all. It only returns
KERN_SUCCESS for the running process itself. I thought you have
permission to retrieve task_info for other processes under the same
user?
It was until Mac OS 10.4 Intel version and Mac OS 10.5 for PPC and
Intel (IIRC)
Is there an easier way to retrieve the memory usage of a process?
Retrieving the pid and process name was not this difficult.
I think you can get some value about memory usage usign sysctl to
retreive the distant kproc_info struct.
Did I miss something obvious? I only found p_comm (name) and pid. But
I'm not familiar with kproc_info at all, so maybe some hints on how to
retrieve memory usage?
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