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dd7d0148 | 1 | /* POSIX compatible read() function. |
5e69ceb7 | 2 | Copyright (C) 2008-2014 Free Software Foundation, Inc. |
dd7d0148 LC |
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 Lesser 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 Lesser General Public License for more details. | |
14 | ||
15 | You should have received a copy of the GNU Lesser 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 | ||
35428fb6 | 23 | #if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
dd7d0148 | 24 | |
35428fb6 LC |
25 | # include <errno.h> |
26 | # include <io.h> | |
dd7d0148 | 27 | |
35428fb6 LC |
28 | # define WIN32_LEAN_AND_MEAN /* avoid including junk */ |
29 | # include <windows.h> | |
dd7d0148 | 30 | |
35428fb6 LC |
31 | # include "msvc-inval.h" |
32 | # include "msvc-nothrow.h" | |
33 | ||
34 | # undef read | |
35 | ||
36 | # if HAVE_MSVC_INVALID_PARAMETER_HANDLER | |
af07e104 | 37 | static ssize_t |
35428fb6 LC |
38 | read_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 | |
dd7d0148 LC |
58 | |
59 | ssize_t | |
60 | rpl_read (int fd, void *buf, size_t count) | |
dd7d0148 | 61 | { |
35428fb6 | 62 | ssize_t ret = read_nothrow (fd, buf, count); |
dd7d0148 | 63 | |
35428fb6 | 64 | # if GNULIB_NONBLOCKING |
dd7d0148 LC |
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 | } | |
35428fb6 LC |
80 | # endif |
81 | ||
dd7d0148 LC |
82 | return ret; |
83 | } | |
84 | ||
dd7d0148 | 85 | #endif |