// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

// This provides a wrapper around system calls which may be interrupted by a
// signal and return EINTR. See man 7 signal.
// To prevent long-lasting loops (which would likely be a bug, such as a signal
// that should be masked) to go unnoticed, there is a limit after which the
// caller will nonetheless see an EINTR in Debug builds.
//
// On Windows and Fuchsia, this wrapper macro does nothing because there are no
// signals.
//
// Don't wrap close calls in HANDLE_EINTR. Use IGNORE_EINTR if the return
// value of close is significant. See http://crbug.com/269623.

#ifndef BASE_ALLOCATOR_PARTITION_ALLOCATOR_SRC_PARTITION_ALLOC_PARTITION_ALLOC_BASE_POSIX_EINTR_WRAPPER_H_
#define BASE_ALLOCATOR_PARTITION_ALLOCATOR_SRC_PARTITION_ALLOC_PARTITION_ALLOC_BASE_POSIX_EINTR_WRAPPER_H_

#include "build/build_config.h"

#if BUILDFLAG(IS_POSIX)

#include <errno.h>

#if defined(NDEBUG)

#define PA_HANDLE_EINTR(x)                                  \
  ({                                                        \
    decltype(x) eintr_wrapper_result;                       \
    do {                                                    \
      eintr_wrapper_result = (x);                           \
    } while (eintr_wrapper_result == -1 && errno == EINTR); \
    eintr_wrapper_result;                                   \
  })

#else

#define PA_HANDLE_EINTR(x)                                   \
  ({                                                         \
    int eintr_wrapper_counter = 0;                           \
    decltype(x) eintr_wrapper_result;                        \
    do {                                                     \
      eintr_wrapper_result = (x);                            \
    } while (eintr_wrapper_result == -1 && errno == EINTR && \
             eintr_wrapper_counter++ < 100);                 \
    eintr_wrapper_result;                                    \
  })

#endif  // NDEBUG

#else  // !BUILDFLAG(IS_POSIX)

#define PA_HANDLE_EINTR(x) (x)

#endif  // !BUILDFLAG(IS_POSIX)

#endif  // BASE_ALLOCATOR_PARTITION_ALLOCATOR_SRC_PARTITION_ALLOC_PARTITION_ALLOC_BASE_POSIX_EINTR_WRAPPER_H_
