Manual page for GETGROUPS(2)
getgroups - get group access list
BSD SYNOPSIS
#include <sys/types.h>
int getgroups(int gidsetlen, int *gidset);
POSIX SYNOPSIS
#include <sys/types.h>
int getgroups(int gidsetlen, gid_t gidset[]);
DESCRIPTION
Getgroups
gets the supplementary group IDs of the user process
and stores it in the array
gidset.
The parameter
gidsetlen
indicates the number of entries that may be placed in
gidset.
Getgroups
returns the actual number of groups returned in
gidset.
For BSD applications,
no more than NGROUPS,
as defined in
<sys/param.h>
will ever be returned.
For POSIX applications,
no more than {NGROUPS_MAX} (see
<limits.h>)
will ever be returned.
If the
gidsetlen
parameter is zero,
getgroups
returns the number of supplemental group IDs associated with
the user process without modifying the
gidset
array.
RETURN VALUE
A successful call returns the number of supplementary group IDs.
A value of -1 indicates that an error occurred, and the error
code is stored in the global variable
errno.
ERRORS
The possible errors for getgroups are:
- [EINVAL]
-
The argument
gidsetlen
is not zero and is less than the number of groups in the group set.
- [EFAULT]
-
The argument gidset specifies
an invalid address.
SEE ALSO
setgroups(2), initgroups(3X), sysconf(2P)
BUGS (BSD-SPECIFIC)
The
gidset
array should be of type
gid_t,
but remains integer for compatibility with earlier systems.
Created by unroff & hp-tools.
© somebody (See intro for details). All Rights Reserved.
Last modified 11/5/97
