52 lines · cpp
1//===-- Linux implementation of recv --------------------------------------===//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/recv.h"10 11#include <linux/net.h> // For SYS_SOCKET socketcall number.12#include <sys/syscall.h> // For syscall numbers.13 14#include "hdr/types/socklen_t.h"15#include "hdr/types/ssize_t.h"16#include "hdr/types/struct_sockaddr.h"17#include "src/__support/OSUtil/syscall.h" // For internal syscall function.18#include "src/__support/common.h"19#include "src/__support/libc_errno.h"20#include "src/__support/macros/sanitizer.h"21 22namespace LIBC_NAMESPACE_DECL {23 24LLVM_LIBC_FUNCTION(ssize_t, recv,25 (int sockfd, void *buf, size_t len, int flags)) {26#ifdef SYS_recv27 ssize_t ret =28 LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_recv, sockfd, buf, len, flags);29#elif defined(SYS_recvfrom)30 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(31 SYS_recvfrom, sockfd, buf, len, flags, nullptr, nullptr);32#elif defined(SYS_socketcall)33 unsigned long sockcall_args[4] = {34 static_cast<unsigned long>(sockfd), reinterpret_cast<unsigned long>(buf),35 static_cast<unsigned long>(len), static_cast<unsigned long>(flags)};36 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_socketcall, SYS_RECV,37 sockcall_args);38#else39#error "socket and socketcall syscalls unavailable for this platform."40#endif41 if (ret < 0) {42 libc_errno = static_cast<int>(-ret);43 return -1;44 }45 46 MSAN_UNPOISON(buf, ret);47 48 return ret;49}50 51} // namespace LIBC_NAMESPACE_DECL52