46 lines · cpp
1//===-- Linux implementation of socketpair --------------------------------===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "src/sys/socket/socketpair.h"10 11#include "src/__support/OSUtil/syscall.h" // For internal syscall function.12#include "src/__support/common.h"13#include "src/__support/libc_errno.h"14#include "src/__support/macros/config.h"15#include "src/__support/macros/sanitizer.h"16#include <linux/net.h> // For SYS_SOCKET socketcall number.17#include <sys/syscall.h> // For syscall numbers.18 19namespace LIBC_NAMESPACE_DECL {20 21LLVM_LIBC_FUNCTION(int, socketpair,22 (int domain, int type, int protocol, int sv[2])) {23#ifdef SYS_socketpair24 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_socketpair, domain, type,25 protocol, sv);26#elif defined(SYS_socketcall)27 unsigned long sockcall_args[3] = {28 static_cast<unsigned long>(domain), static_cast<unsigned long>(type),29 static_cast<unsigned long>(protocol), static_cast<unsigned long>(sv)};30 int ret = LIBC_NAMESPACE::syscall_impl<int>(SYS_socketcall, SYS_SOCKETPAIR,31 sockcall_args);32#else33#error "socket and socketcall syscalls unavailable for this platform."34#endif35 if (ret < 0) {36 libc_errno = -ret;37 return -1;38 }39 40 MSAN_UNPOISON(sv, sizeof(int) * 2);41 42 return ret;43}44 45} // namespace LIBC_NAMESPACE_DECL46