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.\"     @(#)setgroups.2	8.2 (Berkeley) 4/16/94
.\" $FreeBSD: release/9.1.0/lib/libc/sys/setgroups.2 194494 2009-06-19 15:58:24Z brooks $
.\"
.Dd April 16, 1994
.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
The
.Fn setgroups
system call
sets the group access list of the current user process
according to the array
.Fa gidset .
The
.Fa ngroups
argument
indicates the number of entries in the array and must be no
more than
.Dv {NGROUPS_MAX}+1 .
.Pp
Only the super-user may set a new group list.
.Sh RETURN VALUES
.Rv -std setgroups
.Sh ERRORS
The
.Fn setgroups
system call will fail if:
.Bl -tag -width Er
.It Bq Er EPERM
The caller is not the super-user.
.It Bq Er EINVAL
The number specified in the
.Fa ngroups
argument is larger than the
.Dv {NGROUPS_MAX}+1
limit.
.It Bq Er EFAULT
The address specified for
.Fa gidset
is outside the process
address space.
.El
.Sh SEE ALSO
.Xr getgroups 2 ,
.Xr initgroups 3
.Sh HISTORY
The
.Fn setgroups
system call appeared in
.Bx 4.2 .