2.9BSD/usr/net/man/man2/setgrp.2X

.TH SETGRP 2X 3/17/82
.UC 4.1a Provisional
.SH NAME
setgrp \- set/get group access
.SH SYNOPSIS
.B "setgrp(newgroups, oldgroups)"
.br
.B "int *newgroups, *oldgroups;"
.SH DESCRIPTION
.I Setgrp
sets the group access of the current user process according to the bit array
pointed to by
.I newgroups.
Each bit in the array which is set allows access to the correspondingly
numbered group; each bit which is clear denies access.
The array has size NGRPS bits, defined in <sys/param.h>.
The old value of the groups mask is returned in the bit array
referenced by
.I oldgroups.
Either
.I newgroups
or
.I oldgroups
may be omitted by specifying 0.
.PP
Only the super-user may set new groups.
.SH SEE ALSO
inigrp(3x)
.SH BUGS
Group ID numbers are allowed to range only from 0 through 255.
.PP
This call is provisional, and will exist in a slightly different form
in 4.2bsd.