summaryrefslogtreecommitdiffstats
path: root/gl/read.c
blob: 0fe0306f1a8431bec481a1330e970326f7996e68 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
/* POSIX compatible read() function.
   Copyright (C) 2008-2013 Free Software Foundation, Inc.
   Written by Bruno Haible <bruno@clisp.org>, 2011.

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License for more details.

   You should have received a copy of the GNU General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.  */

#include <config.h>

/* Specification.  */
#include <unistd.h>

#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__

# include <errno.h>
# include <io.h>

# define WIN32_LEAN_AND_MEAN  /* avoid including junk */
# include <windows.h>

# include "msvc-inval.h"
# include "msvc-nothrow.h"

# undef read

# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
static ssize_t
read_nothrow (int fd, void *buf, size_t count)
{
  ssize_t result;

  TRY_MSVC_INVAL
    {
      result = read (fd, buf, count);
    }
  CATCH_MSVC_INVAL
    {
      result = -1;
      errno = EBADF;
    }
  DONE_MSVC_INVAL;

  return result;
}
# else
#  define read_nothrow read
# endif

ssize_t
rpl_read (int fd, void *buf, size_t count)
{
  ssize_t ret = read_nothrow (fd, buf, count);

# if GNULIB_NONBLOCKING
  if (ret < 0
      && GetLastError () == ERROR_NO_DATA)
    {
      HANDLE h = (HANDLE) _get_osfhandle (fd);
      if (GetFileType (h) == FILE_TYPE_PIPE)
        {
          /* h is a pipe or socket.  */
          DWORD state;
          if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0)
              && (state & PIPE_NOWAIT) != 0)
            /* h is a pipe in non-blocking mode.
               Change errno from EINVAL to EAGAIN.  */
            errno = EAGAIN;
        }
    }
# endif

  return ret;
}

#endif