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.\"     @(#)setgroups.2	8.2 (Berkeley) 4/16/94
.\"
.Dd October 7, 2006
.Dt SETGROUPS 2
.Os
.Sh NAME
.Nm setgroups
.Nd set group access list
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.In sys/param.h
.In unistd.h
.Ft int
.Fn setgroups "int ngroups" "const gid_t *gidset"
.Sh DESCRIPTION
.Fn setgroups
sets the group access list of the current user process
according to the array
.Fa gidset .
The parameter
.Fa ngroups
indicates the number of entries in the array and must be no
more than
.Brq Dv NGROUPS_MAX .
.Pp
Only the super-user may set new groups.
.Pp
This system call affects only secondary groups.
.Sh RETURN VALUES
A 0 value is returned on success, \-1 on error, with
an error code stored in
.Va errno .
.Sh ERRORS
The
.Fn setgroups
call will fail if:
.Bl -tag -width Er
.It Bq Er EINVAL
The value of
.Fa ngroups
is greater than
.Brq Dv NGROUPS_MAX .
.It Bq Er EPERM
The caller is not the super-user.
.It Bq Er EFAULT
The address specified for
.Fa gidset
is outside the process
address space.
.El
.Sh SEE ALSO
.Xr getgroups 2 ,
.Xr setegid 2 ,
.Xr setgid 2 ,
.Xr setregid 2 ,
.Xr initgroups 3
.Sh HISTORY
The
.Fn setgroups
function call appeared in
.Bx 4.2 .