You have to seteuid to the user, get the group, then return to uid 0. Because setuid() will change all of the uid settings (real, effective, etc.) you may think you can call seteuid() instead, so that you can later call setuid to root. But seteuid() does not change groups. Which does not work for what you want....
So, you have to exec(), setuid() to nobody, write the result of getgroups to shared memory, exit the child process.
IMO, It is probably less complicated to try this:
Then parse out the uids, usually nobody is a single group so one atoi call returns the group.
Last edited by jim mcnamara; 04-28-2011 at 02:15 PM..
Reason: change -g to -R see red text
when /var directory of my machine gets filled up (85%) i removed some old logs. but after cleaning df -k command still shows that /var is still 85% full.
It can detect the actual disk space only after I restart the machine. Is there a way to force df to reflect actual free space without... (1 Reply)
What's the best way to find out how much memory is being used/available? I tried using free, but I didn't quite understand the output. Can someone explain it?
$ free
total used free shared buffers cached
Mem: 16304536 16256376 48160 0 ... (6 Replies)
What is amount of free RAM i have now?
total used free shared buffers cached
Mem: 1010 963 46 0 215 256
-/+ buffers/cache: 491 518
Swap: 1983 0 1983
Above is the output of... (1 Reply)
how can I find cpu usage memory usage swap usage and
I want to know CPU usage above X% and contiue Y times and memory usage above X % and contiue Y times
my final destination is monitor process
logical volume usage above X % and number of Logical voluage above
can I not to... (3 Replies)
Hi ,
As I am new to Linux server, I am facing some doubts like: On linux server virtual memory usage goes to 99%, but I have Threshold limit of 95%. So it crossed the threshold limit and alarmd.
Yesterday I moniterd the server using TOP command, and found some of Tibco process was consuming... (1 Reply)
I have installed Ubuntu and i want to monitor the internet usage.
Is there any software for linux for monitoring the internet usage?
(preferabaly opensource) (1 Reply)
Hi all
I was wondering if its possible to write a script to keep CPU usage at 90%-95%? for a single cpu linux server?
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Hello
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Hi,
My server is Centos 6 i686.
Is it possible get an openssl download from this site
"https://www.openssl.org/source/" (which is used for 64 bit platforms)
and use it on 32 bit platforms also?
Thx,
Aigini (5 Replies)
Discussion started by: anaigini45
5 Replies
LEARN ABOUT SUNOS
setgroups
getgroups(2) System Calls getgroups(2)NAME
getgroups, setgroups - get or set supplementary group access list IDs
SYNOPSIS
#include <unistd.h>
int getgroups(int gidsetsize, gid_t *grouplist);
int setgroups(int ngroups, const gid_t *grouplist);
DESCRIPTION
The getgroups() function gets the current supplemental group access list of the calling process and stores the result in the array of group
IDs specified by grouplist. This array has gidsetsize entries and must be large enough to contain the entire list. This list cannot be
larger than NGROUPS_MAX. If gidsetsize equals 0, getgroups() will return the number of groups to which the calling process belongs without
modifying the array pointed to by grouplist.
The setgroups() function sets the supplementary group access list of the calling process from the array of group IDs specified by grou-
plist. The number of entries is specified by ngroups and can not be greater than NGROUPS_MAX.
RETURN VALUES
Upon successful completion, getgroups() returns the number of supplementary group IDs set for the calling process and setgroups() returns
0. Otherwise, -1 is returned and errno is set to indicate the error.
ERRORS
The getgroups() and setgroups() functions will fail if:
EFAULT A referenced part of the array pointed to by grouplist is an illegal address.
The getgroups() function will fail if:
EINVAL The value of gidsetsize is non-zero and less than the number of supplementary group IDs set for the calling process.
The setgroups() function will fail if:
EINVAL The value of ngroups is greater than {NGROUPS_MAX}.
EPERM The {PRIV_PROC_SETID} privilege is not asserted in the effective set of the calling process.
USAGE
Use of the setgroups() function requires the {PRIV_PROC_SETID} privilege.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Interface Stability |getgroups() is Standard. |
+-----------------------------+-----------------------------+
|MT-Level |Async-Signal-Safe |
+-----------------------------+-----------------------------+
SEE ALSO groups(1), chown(2), getuid(2), setuid(2), getgrnam(3C), initgroups(3C), attributes(5), privileges(5), standards(5)SunOS 5.10 1 Feb 2003 getgroups(2)