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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_UMAX. 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 grouplist. 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}.
SunOS 5.10 Last change: 8 Sep 2006 1
System Calls getgroups(2)
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 attri-
butes:
____________________________________________________________
| 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 Last change: 8 Sep 2006 2
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This page was generated on Wed Sep 12 11:27:08 GMT 2007
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