| 1 | /* POSIX compatible read() function. |
| 2 | Copyright (C) 2008-2011 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 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 | |
| 23 | /* Replace this function only if module 'nonblocking' is requested. */ |
| 24 | #if GNULIB_NONBLOCKING |
| 25 | |
| 26 | # if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
| 27 | |
| 28 | # include <errno.h> |
| 29 | # include <io.h> |
| 30 | |
| 31 | # define WIN32_LEAN_AND_MEAN /* avoid including junk */ |
| 32 | # include <windows.h> |
| 33 | |
| 34 | ssize_t |
| 35 | rpl_read (int fd, void *buf, size_t count) |
| 36 | #undef read |
| 37 | { |
| 38 | ssize_t ret = read (fd, buf, count); |
| 39 | |
| 40 | if (ret < 0 |
| 41 | && GetLastError () == ERROR_NO_DATA) |
| 42 | { |
| 43 | HANDLE h = (HANDLE) _get_osfhandle (fd); |
| 44 | if (GetFileType (h) == FILE_TYPE_PIPE) |
| 45 | { |
| 46 | /* h is a pipe or socket. */ |
| 47 | DWORD state; |
| 48 | if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0) |
| 49 | && (state & PIPE_NOWAIT) != 0) |
| 50 | /* h is a pipe in non-blocking mode. |
| 51 | Change errno from EINVAL to EAGAIN. */ |
| 52 | errno = EAGAIN; |
| 53 | } |
| 54 | } |
| 55 | return ret; |
| 56 | } |
| 57 | |
| 58 | # endif |
| 59 | #endif |