tests/test-pipe.c

   1 /* Test of pipe.
   2    Copyright (C) 2009-2017 Free Software Foundation, Inc.
   3
   4    This program is free software; you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation; either version 3, or (at your option)
   7    any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program; if not, see <http://www.gnu.org/licenses/>.  */
  16
  17 #include <config.h>
  18
  19 #include <unistd.h>
  20
  21 #include "signature.h"
  22 SIGNATURE_CHECK (pipe, int, (int[2]));
  23
  24 #include <fcntl.h>
  25 #include <stdbool.h>
  26
  27 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  28 /* Get declarations of the native Windows API functions.  */
  29 # define WIN32_LEAN_AND_MEAN
  30 # include <windows.h>
  31 /* Get _get_osfhandle.  */
  32 # include "msvc-nothrow.h"
  33 #endif
  34
  35 #include "binary-io.h"
  36 #include "macros.h"
  37
  38 /* Return true if FD is open.  */
  39 static bool
  40 is_open (int fd)
  41 {
  42 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  43   /* On native Windows, the initial state of unassigned standard file
  44      descriptors is that they are open but point to an
  45      INVALID_HANDLE_VALUE, and there is no fcntl.  */
  46   return (HANDLE) _get_osfhandle (fd) != INVALID_HANDLE_VALUE;
  47 #else
  48 # ifndef F_GETFL
  49 #  error Please port fcntl to your platform
  50 # endif
  51   return 0 <= fcntl (fd, F_GETFL);
  52 #endif
  53 }
  54
  55 /* Return true if FD is not inherited to child processes.  */
  56 static bool
  57 is_cloexec (int fd)
  58 {
  59 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  60   HANDLE h = (HANDLE) _get_osfhandle (fd);
  61   DWORD flags;
  62   ASSERT (GetHandleInformation (h, &flags));
  63   return (flags & HANDLE_FLAG_INHERIT) == 0;
  64 #else
  65   int flags;
  66   ASSERT ((flags = fcntl (fd, F_GETFD)) >= 0);
  67   return (flags & FD_CLOEXEC) != 0;
  68 #endif
  69 }
  70
  71 /* Return true if FD is in non-blocking mode.  */
  72 static bool
  73 is_nonblocking (int fd)
  74 {
  75 #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
  76   /* We don't use the non-blocking mode for sockets here.  */
  77   return 0;
  78 #else
  79   int flags;
  80   ASSERT ((flags = fcntl (fd, F_GETFL)) >= 0);
  81   return (flags & O_NONBLOCK) != 0;
  82 #endif
  83 }
  84
  85 int
  86 main ()
  87 {
  88   int fd[2];
  89
  90   fd[0] = -1;
  91   fd[1] = -1;
  92   ASSERT (pipe (fd) >= 0);
  93   ASSERT (fd[0] >= 0);
  94   ASSERT (fd[1] >= 0);
  95   ASSERT (fd[0] != fd[1]);
  96   ASSERT (is_open (fd[0]));
  97   ASSERT (is_open (fd[1]));
  98   ASSERT (!is_cloexec (fd[0]));
  99   ASSERT (!is_cloexec (fd[1]));
 100   ASSERT (!is_nonblocking (fd[0]));
 101   ASSERT (!is_nonblocking (fd[1]));
 102
 103   return 0;
 104 }