On Tue, May 14, 2013 at 10:00:21AM +0200, Mike Ma wrote:
> Hi folks,
>
> Can I ask if there's any way to get ucred/xucred of a process in user space?
> As I'm trying to port glustertfs and it's a userland filesystem, I need to
> get secondary groups of a process.
>
> AFAIK, Linux gets them in /proc and NetBSD gets them in this way:
> int name[] = { CTL_KERN, KERN_PROC, KERN_PROC_PID, frame->root->pid
> };
> size_t namelen = sizeof name / sizeof name[0];
> struct kinfo_proc kp;
> size_t kplen = sizeof(kp);
> int i, ngroups;
> if (sysctl(name, namelen, &kp, &kplen, NULL, 0) != 0)
> return;
> ngroups = MIN(kp.kp_eproc.e_ucred.cr_ngroups, GF_REQUEST_MAXGROUPS);
>
> I realized none of them would work in FreeBSD.
> I'm wondering if there's any alternative way to get group information?The sysctl to retrieve the list of the groups the process belongs to is CTL_KERN/KERN_PROC/KERN_PROC_GROUPS. On HEAD, the libprocstat(3) contains the helper procstat_getgroups() which would be more conventient to use, or you could borrow a code from it.
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