Dgdrxrt

I can use glossaries, I mean compile and generate PDF of first example from http://mirrors.cqu.edu.cn/CTAN/macros/latex/contrib/glossaries/glossariesbegin.pdf:

documentclassarticle
usepackageglossaries
newglossaryentryexname=sample,description=an example
begindocument
Here's my glsex term.
enddocument

But I would like to use glossaries from the package I provide. I mean I would like to have doc.tex:

documentclassarticle
usepackagedoc
newglossaryentryexname=sample,description=an example
begindocument
Here's my glsex term.
enddocument

and doc.sty:

ProvidesPackagedoc
usepackageglossaries

That's what I got:

$ pdflatex doc.tex 
This is pdfTeX, Version 3.14159265-2.6-1.40.19 (TeX Live 2018) (preloaded format=pdflatex)
 restricted write18 enabled.
entering extended mode
(./doc.tex
LaTeX2e <2018-04-01> patch level 2
Babel <3.18> and hyphenation patterns for 84 language(s) loaded.
(/usr/local/texlive/2018/texmf-dist/tex/latex/base/article.cls
Document Class: article 2014/09/29 v1.4h Standard LaTeX document class
(/usr/local/texlive/2018/texmf-dist/tex/latex/base/size10.clo)) (./doc.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/glossaries/base/glossaries.sty
(/usr/local/texlive/2018/texmf-dist/tex/latex/base/ifthen.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/xkeyval/xkeyval.sty
(/usr/local/texlive/2018/texmf-dist/tex/generic/xkeyval/xkeyval.tex
(/usr/local/texlive/2018/texmf-dist/tex/generic/xkeyval/xkvutils.tex
(/usr/local/texlive/2018/texmf-dist/tex/generic/xkeyval/keyval.tex))))
(/usr/local/texlive/2018/texmf-dist/tex/latex/mfirstuc/mfirstuc.sty
(/usr/local/texlive/2018/texmf-dist/tex/latex/etoolbox/etoolbox.sty))
(/usr/local/texlive/2018/texmf-dist/tex/latex/textcase/textcase.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/xfor/xfor.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/datatool/datatool-base.sty
(/usr/local/texlive/2018/texmf-dist/tex/latex/amsmath/amsmath.sty
For additional information on amsmath, use the `?' option.
(/usr/local/texlive/2018/texmf-dist/tex/latex/amsmath/amstext.sty
(/usr/local/texlive/2018/texmf-dist/tex/latex/amsmath/amsgen.sty))
(/usr/local/texlive/2018/texmf-dist/tex/latex/amsmath/amsbsy.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/amsmath/amsopn.sty))
(/usr/local/texlive/2018/texmf-dist/tex/latex/substr/substr.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/datatool/datatool-fp.sty
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp.sty
`Fixed Point Package', Version 0.8, April 2, 1995 (C) Michael Mehlich
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/defpattern.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-basic.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-addons.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-snap.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-exp.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-trigo.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-pas.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-random.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-eqn.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-upn.sty)
(/usr/local/texlive/2018/texmf-dist/tex/latex/fp/fp-eval.sty))))

! LaTeX Error: PrintChanges undefined.

See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
 ... 

l.64 renewcommandPrintChanges
 {%
? 

I actually found a reference to that PrintChanges in http://mirrors-wan.geekpie.club/CTAN/macros/latex/contrib/glossaries/glossaries-code.pdf page 5 but even so I don't know. What can I do?

Don't name your package "doc". doc.sty exists already (in latex/base) and glossaries contains special code when it detect that it has been used:

@ifpackageloadeddoc%
%
 @gls@docloadedtrue
%
%
 @ifclassloadednlctdoc@gls@docloadedtrue@gls@docloadedfalse%

if@gls@docloaded
 letglsorg@theglossarytheglossary
 letglsorg@endtheglossaryendtheglossary
 letglsorg@PrintChangesPrintChanges
 renewcommandPrintChanges%
 begingroup
 lettheglossaryglsorg@theglossary
 letendtheglossaryglsorg@endtheglossary
 glsorg@PrintChanges
 endgroup
 
fi