//===-- Linux implementation of recv --------------------------------------===//
//
// 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 "src/sys/socket/recv.h"

#include <sys/syscall.h> // For syscall numbers.

#include "hdr/types/socklen_t.h"
#include "hdr/types/ssize_t.h"
#include "hdr/types/struct_sockaddr.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/sanitizer.h"

namespace LIBC_NAMESPACE_DECL {

LLVM_LIBC_FUNCTION(ssize_t, recv,
                   (int sockfd, void *buf, size_t len, int flags)) {
#ifdef SYS_recv
  ssize_t ret = syscall_impl<ssize_t>(SYS_recv, sockfd, buf, len, flags);
#elif defined(SYS_recvfrom)
  ssize_t ret = syscall_impl<ssize_t>(SYS_recvfrom, sockfd, buf, len, flags,
                                      nullptr, nullptr);
#else
#error "recv or recvfrom syscalls unavailable for this platform."
#endif
  if (ret < 0) {
    libc_errno = static_cast<int>(-ret);
    return -1;
  }

  MSAN_UNPOISON(buf, ret);

  return ret;
}

} // namespace LIBC_NAMESPACE_DECL