GetGid [renamed]

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a16b03

Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia

a16b03 07 Dec 2006, 21:01

What's the difference between

sys_getgid
&
sys_getegid

Last edited by a16b03 on 07 Dec 2006, 22:00; edited 2 times in total

07 Dec 2006, 21:01

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 07 Dec 2006, 21:10

07 Dec 2006, 21:10

a16b03

Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia

a16b03 07 Dec 2006, 21:17

I don't believe. You gotta be kidding me.

...

Are you serious? Is that all?

P.S. eax is 50 and 47.

07 Dec 2006, 21:17

rugxulo

Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)

rugxulo 07 Dec 2006, 21:28

a16b03, sorry, just my little joke, I don't know the difference. I was just being goofy (thought it was obvious). Embarassed

07 Dec 2006, 21:28

vid
Verbosity in development

Joined: 05 Sep 2003
Posts: 7103
Location: Slovakia

vid 07 Dec 2006, 21:41

47 = get real group id
50 = get effective group id

no idea what these are Smile

07 Dec 2006, 21:41

a16b03

Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia

a16b03 07 Dec 2006, 21:41

Here's more

sys_getpgid
sys_getpgrp

Maybe you can help
I need to get process GID.

here's what i use

Code:

        mov     eax,132
        xor     ebx,ebx
        int     0x80
        or      eax,5
        jnz     NOT_IN_TTY_GROUP

is it correct?

maybe mov eax,132 sould be replaced with other syscall.

07 Dec 2006, 21:41

gunblade

Joined: 19 Feb 2004
Posts: 209

gunblade 07 Dec 2006, 21:43

man 2 getgid answers all your questions:

getgid returns the real group ID of the current process.

getegid returns the effective group ID of the current process.

The real ID corresponds to the ID of the calling process. The effec-
tive ID corresponds to the set ID bit on the file being executed.

Thats your best bet for any syscall, remove the "sys_" prefix, then just do man 2 <rest of syscall name>

07 Dec 2006, 21:43

a16b03

Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia

a16b03 07 Dec 2006, 21:58

Oh. I think i know whats wrong with my prog.

getgid returns all groups, rignt (for process)?
And If I want to know if user is in tty (GID=5) group i must somehow mask it out right?

Last edited by a16b03 on 07 Dec 2006, 22:05; edited 1 time in total

07 Dec 2006, 21:58

a16b03

Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia

a16b03 07 Dec 2006, 21:59

I'll rename This post to GetGid

07 Dec 2006, 21:59

arafel

Joined: 29 Aug 2006
Posts: 131
Location: Jerusalem, Israel

arafel 26 Dec 2006, 20:06

sys_getgid returns real group id for the process and sys_getgroups retrieves a lists of all the supplementary groups id's.
No need to mask out (or do any other operations on) the return values. Just check whether the required group equals to primary or one of the supplementary groups.

26 Dec 2006, 20:06

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