interprocess_util.cc

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// Copyright (C) 2013-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.
 
#include <config.h>
 
#include <gtest/gtest.h>
 
#include <sys/select.h>
#include <cstddef>
 
namespace isc {
namespace util {
namespace unittests {
 
unsigned char
parentReadState(int fd) {
  unsigned char result = 0xff;
 
  fd_set rfds;
  FD_ZERO(&rfds);
  FD_SET(fd, &rfds);
 
  struct timeval tv = {5, 0};
 
  const int nfds = select(fd + 1, &rfds, NULL, NULL, &tv);
  EXPECT_EQ(1, nfds);
 
  if (nfds == 1) {
      // Read status
      const ssize_t bytes_read = read(fd, &result, sizeof(result));
      EXPECT_EQ(sizeof(result), bytes_read);
  }
 
  return (result);
}
 
}
}
}