Date: Tue, 14 May 2013 14:13:18 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Mike Ma <mikemandarine@gmail.com> Cc: freebsd-hackers@freebsd.org Subject: Re: How to get ucred/xucred in user space? Message-ID: <20130514111318.GP3047@kib.kiev.ua> In-Reply-To: <CA%2BcqwfdohLfzeJXx-2wPwMjZDq3zX-BnDcOpyz_MU4PS9Ur6DA@mail.gmail.com> References: <CA%2BcqwfdohLfzeJXx-2wPwMjZDq3zX-BnDcOpyz_MU4PS9Ur6DA@mail.gmail.com>
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On Tue, May 14, 2013 at 10:00:21AM +0200, Mike Ma wrote:
> Hi folks,
>=20
> Can I ask if there's any way to get ucred/xucred of a process in user spa=
ce?
> As I'm trying to port glustertfs and it's a userland filesystem, I need to
> get secondary groups of a process.
>=20
> AFAIK, Linux gets them in /proc and NetBSD gets them in this way:
> int name[] =3D { CTL_KERN, KERN_PROC, KERN_PROC_PID, frame->root-=
>pid
> };
> size_t namelen =3D sizeof name / sizeof name[0];
> struct kinfo_proc kp;
> size_t kplen =3D sizeof(kp);
> int i, ngroups;
> if (sysctl(name, namelen, &kp, &kplen, NULL, 0) !=3D 0)
> return;
> ngroups =3D MIN(kp.kp_eproc.e_ucred.cr_ngroups, GF_REQUEST_MAXGRO=
UPS);
>=20
> 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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