Problem in setgroups system call

ppy · 11-04-2004, 08:23 AM

I am running the following code on two different distributions on different machines ,

main()
{
int ret;

ret = setgroups(33,0);
printf("ret %d error %d\n",ret,errno);
perror(" ");
}

I am getting different outputs like :

machine 1, distribution 1 :
ret -1 error 14
: bad address
Hardware details : Intel Xeon P4 2ghz, 256mb ram
Distribution : my own build system

machine 2, distribution 2 :
ret -1 error 22
: Invalid argument
Hardware details : Intel P4 2ghz, 256mb ram
Distribution : Redhat fedora v10

Why is this so ?

Thanks in adavance,
Prashant P Y

Hko · 11-04-2004, 08:52 AM

Quote:

Originally posted by ppy
ret = setgroups(33,0);

The prototype for setgroups() is:

Code:

int setgroups(size_t size, const gid_t *list);

So, when you call

Code:

setgroups(33,0);

You are passing 0 as the pointer where setgroups() can find 33 gid's ?!?!?
"bas address" it says. Not really surprising IMHO...