ceph/src/common/pipe.c

   1 // -*- mode:C++; tab-width:8; c-basic-offset:2; indent-tabs-mode:t -*-
   2 // vim: ts=8 sw=2 smarttab
   3 /*
   4  * Ceph - scalable distributed file system
   5  *
   6  * Copyright (C) 2011 New Dream Network
   7  *
   8  * This is free software; you can redistribute it and/or
   9  * modify it under the terms of the GNU Lesser General Public
  10  * License version 2.1, as published by the Free Software
  11  * Foundation.  See file COPYING.
  12  *
  13  */
  14 #include "acconfig.h"
  15
  16 #include "common/pipe.h"
  17 #include "include/compat.h"
  18
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <limits.h>
  22 #include <stdint.h>
  23 #include <unistd.h>
  24
  25 int pipe_cloexec(int pipefd[2])
  26 {
  27         int ret;
  28
  29 #if defined(HAVE_PIPE2) && defined(O_CLOEXEC)
  30         ret = pipe2(pipefd, O_CLOEXEC);
  31         if (ret == -1)
  32                 return -errno;
  33         return 0;
  34 #else
  35         ret = pipe(pipefd);
  36         if (ret == -1)
  37                 return -errno;
  38
  39         /*
  40          * The old-fashioned, race-condition prone way that we have to fall
  41          * back on if O_CLOEXEC does not exist.
  42          */
  43         ret = fcntl(pipefd[0], F_SETFD, FD_CLOEXEC);
  44         if (ret == -1) {
  45                 ret = -errno;
  46                 goto out;
  47         }
  48
  49         ret = fcntl(pipefd[1], F_SETFD, FD_CLOEXEC);
  50         if (ret == -1) {
  51                 ret = -errno;
  52                 goto out;
  53         }
  54
  55         return 0;
  56
  57 out:
  58         VOID_TEMP_FAILURE_RETRY(close(pipefd[0]));
  59         VOID_TEMP_FAILURE_RETRY(close(pipefd[1]));
  60
  61         return ret;
  62 #endif
  63 }