docs: Added UNIX V10 Manuals

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+.TH SETUPGROUPS 3
+.SH NAME
+setupgroups \- set access group vector for invoker
+.SH SYNOPSIS
+.B setupgroups(name, gid)
+.br
+.B char *name;
+.br
+.B int gid;
+.SH DESCRIPTION
+This library routine sets up the invoker's access group vector
+by searching the
+.I /etc/group
+file for groups matching
+.IR name .
+The invokers real group ID should be passed in
+.IR gid ,
+as there is no need to load this into the vector.
+.PP
+.I Setgroups
+returns 0 for success, or \-1 on error with
+.I errno
+set appropriately.
+.PP
+This routine is safe to use on systems
+where the multiple access groups system calls have not been installed.
+.SH "SEE ALSO"
+setgroups(2),
+getgrent(3),
+login(8).