1

enter image description here

I know esint package can type line integral with square paths: $\sqint$, but today I need a square arrowed line integral. Does anyone know how to do it ?

3

A proposotoin with the \stackinset command from stackengine, \squint from esint and \Lsh from mathabx (without loading mathabx):

\documentclass{article}
\usepackage{amsmath, amssymb,}
\usepackage{nccmath}
\usepackage{esint}


\DeclareFontFamily{U}{mathb}{\hyphenchar\font45}
\DeclareFontShape{U}{mathb}{m}{n}{ <-6> mathb5 <6-7> mathb6 <7-8>
mathb7 <8-9> mathb8 <9-10> mathb9 <10-12> mathb10 <12-> mathb12 }{}
\DeclareSymbolFont{mathb}{U}{mathb}{m}{n}
%
\DeclareMathSymbol{\Lsh}{\mathrel}{mathb}{"E8}
\usepackage{xcolor} 
 \usepackage{stackengine} %
\newcommand{\mysqint}{\mathop{{\stackMath\stackinset{c}{0.03ex}{c}{0.235ex}{\scriptstyle\Lsh}{\sqint}}}}

\begin{document}

\[ I = \mysqint g(z)\,\mathrm d z \]

\end{document} 

enter image description here

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