man/man2/getgroups.2

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 GETGROUPS 2 "Sep 8, 2006"
 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}.


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(7) 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 (7),  privileges (7),  standards (7)