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Index > Linux > GetGid [renamed]

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a16b03



Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia
a16b03
What's the difference between

sys_getgid
&
sys_getegid


Last edited by a16b03 on 07 Dec 2006, 22:00; edited 2 times in total
Post 07 Dec 2006, 21:01
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rugxulo



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


Laughing
Post 07 Dec 2006, 21:10
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a16b03



Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia
a16b03
I don't believe. You gotta be kidding me.

...

Are you serious? Is that all?


P.S. eax is 50 and 47.
Post 07 Dec 2006, 21:17
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rugxulo



Joined: 09 Aug 2005
Posts: 2341
Location: Usono (aka, USA)
rugxulo
a16b03, sorry, just my little joke, I don't know the difference. I was just being goofy (thought it was obvious). Embarassed
Post 07 Dec 2006, 21:28
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vid
Verbosity in development


Joined: 05 Sep 2003
Posts: 7105
Location: Slovakia
vid
47 = get real group id
50 = get effective group id

no idea what these are Smile
Post 07 Dec 2006, 21:41
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a16b03



Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia
a16b03
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.
Post 07 Dec 2006, 21:41
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gunblade



Joined: 19 Feb 2004
Posts: 209
gunblade
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>
Post 07 Dec 2006, 21:43
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a16b03



Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia
a16b03
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
Post 07 Dec 2006, 21:58
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a16b03



Joined: 24 Jan 2006
Posts: 43
Location: Riga, Latvia
a16b03
I'll rename This post to GetGid
Post 07 Dec 2006, 21:59
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arafel



Joined: 29 Aug 2006
Posts: 131
Location: Jerusalem, Israel
arafel
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.
Post 26 Dec 2006, 20:06
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