CloexecAcceptCheck.cpp

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//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
 
#include "CloexecAcceptCheck.h"
#include "clang/ASTMatchers/ASTMatchFinder.h"
 
using namespace clang::ast_matchers;
 
namespace clang::tidy::android {
 
void CloexecAcceptCheck::registerMatchers(MatchFinder *Finder) {
  const auto SockAddrPointerType =
      hasType(pointsTo(recordDecl(isStruct(), hasName("sockaddr"))));
  const auto SockLenPointerType =
      hasType(pointsTo(namedDecl(hasName("socklen_t"))));
 
  registerMatchersImpl(Finder,
                       functionDecl(returns(isInteger()), hasName("accept"),
                                    hasParameter(0, hasType(isInteger())),
                                    hasParameter(1, SockAddrPointerType),
                                    hasParameter(2, SockLenPointerType)));
}
 
void CloexecAcceptCheck::check(const MatchFinder::MatchResult &Result) {
  const std::string ReplacementText =
      (Twine("accept4(") + getSpellingArg(Result, 0) + ", " +
       getSpellingArg(Result, 1) + ", " + getSpellingArg(Result, 2) +
       ", SOCK_CLOEXEC)")
          .str();
 
  replaceFunc(
      Result,
      "prefer accept4() to accept() because accept4() allows SOCK_CLOEXEC",
      ReplacementText);
}
 
} // namespace clang::tidy::android