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1/* POSIX compatible read() function.
2 Copyright (C) 2008-2013 Free Software Foundation, Inc.
3 Written by Bruno Haible <bruno@clisp.org>, 2011.
4
5 This program is free software: you can redistribute it and/or modify
6 it under the terms of the GNU General Public License as published by
7 the Free Software Foundation; either version 3 of the License, or
8 (at your option) any later version.
9
10 This program is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 GNU General Public License for more details.
14
15 You should have received a copy of the GNU General Public License
16 along with this program. If not, see <http://www.gnu.org/licenses/>. */
17
18#include <config.h>
19
20/* Specification. */
21#include <unistd.h>
22
23#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__
24
25# include <errno.h>
26# include <io.h>
27
28# define WIN32_LEAN_AND_MEAN /* avoid including junk */
29# include <windows.h>
30
31# include "msvc-inval.h"
32# include "msvc-nothrow.h"
33
34# undef read
35
36# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
37static ssize_t
38read_nothrow (int fd, void *buf, size_t count)
39{
40 ssize_t result;
41
42 TRY_MSVC_INVAL
43 {
44 result = read (fd, buf, count);
45 }
46 CATCH_MSVC_INVAL
47 {
48 result = -1;
49 errno = EBADF;
50 }
51 DONE_MSVC_INVAL;
52
53 return result;
54}
55# else
56# define read_nothrow read
57# endif
58
59ssize_t
60rpl_read (int fd, void *buf, size_t count)
61{
62 ssize_t ret = read_nothrow (fd, buf, count);
63
64# if GNULIB_NONBLOCKING
65 if (ret < 0
66 && GetLastError () == ERROR_NO_DATA)
67 {
68 HANDLE h = (HANDLE) _get_osfhandle (fd);
69 if (GetFileType (h) == FILE_TYPE_PIPE)
70 {
71 /* h is a pipe or socket. */
72 DWORD state;
73 if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0)
74 && (state & PIPE_NOWAIT) != 0)
75 /* h is a pipe in non-blocking mode.
76 Change errno from EINVAL to EAGAIN. */
77 errno = EAGAIN;
78 }
79 }
80# endif
81
82 return ret;
83}
84
85#endif