1// Copyright (c) 2010 Google Inc.
2// All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met:
7//
8//     * Redistributions of source code must retain the above copyright
9// notice, this list of conditions and the following disclaimer.
10//     * Redistributions in binary form must reproduce the above
11// copyright notice, this list of conditions and the following disclaimer
12// in the documentation and/or other materials provided with the
13// distribution.
14//     * Neither the name of Google Inc. nor the names of its
15// contributors may be used to endorse or promote products derived from
16// this software without specific prior written permission.
17//
18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30#ifndef COMMON_LINUX_EINTR_WRAPPER_H_
31#define COMMON_LINUX_EINTR_WRAPPER_H_
32
33#include <errno.h>
34
35// This provides a wrapper around system calls which may be interrupted by a
36// signal and return EINTR. See man 7 signal.
37//
38
39#define HANDLE_EINTR(x) ({ \
40  __typeof__(x) eintr_wrapper_result; \
41  do { \
42    eintr_wrapper_result = (x); \
43  } while (eintr_wrapper_result == -1 && errno == EINTR); \
44  eintr_wrapper_result; \
45})
46
47#define IGNORE_EINTR(x) ({ \
48  __typeof__(x) eintr_wrapper_result; \
49  do { \
50    eintr_wrapper_result = (x); \
51    if (eintr_wrapper_result == -1 && errno == EINTR) { \
52      eintr_wrapper_result = 0; \
53    } \
54  } while (0); \
55  eintr_wrapper_result; \
56})
57
58#endif  // COMMON_LINUX_EINTR_WRAPPER_H_
59