libc/src/sys/mman/linux/shm_open.cpp

//===---------- Linux implementation of the shm_open function -------------===//
//
// 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/mman/shm_open.h"

#include "hdr/fcntl_macros.h"
#include "hdr/types/mode_t.h"
#include "src/__support/OSUtil/linux/syscall_wrappers/open.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/sys/mman/linux/shm_common.h"

namespace LIBC_NAMESPACE_DECL {

static constexpr int DEFAULT_OFLAGS = O_NOFOLLOW | O_CLOEXEC | O_NONBLOCK;

LLVM_LIBC_FUNCTION(int, shm_open, (const char *name, int oflags, mode_t mode)) {
  auto path_result = shm_common::translate_name(name);
  if (!path_result.has_value()) {
    libc_errno = path_result.error();
    return -1;
  }

  auto open_result =
      linux_syscalls::open(path_result->data(), oflags | DEFAULT_OFLAGS, mode);
  if (!open_result.has_value()) {
    libc_errno = open_result.error();
    return -1;
  }
  return open_result.value();
}

} // namespace LIBC_NAMESPACE_DECL