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85 lines
2.1 KiB
85 lines
2.1 KiB
/* POSIX compatible read() function. |
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Copyright (C) 2008-2017 Free Software Foundation, Inc. |
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Written by Bruno Haible <bruno@clisp.org>, 2011. |
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This program is free software: you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 3 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program. If not, see <http://www.gnu.org/licenses/>. */ |
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#include <config.h> |
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/* Specification. */ |
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#include <unistd.h> |
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#if (defined _WIN32 || defined __WIN32__) && ! defined __CYGWIN__ |
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# include <errno.h> |
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# include <io.h> |
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# define WIN32_LEAN_AND_MEAN /* avoid including junk */ |
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# include <windows.h> |
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# include "msvc-inval.h" |
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# include "msvc-nothrow.h" |
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# undef read |
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# if HAVE_MSVC_INVALID_PARAMETER_HANDLER |
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static ssize_t |
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read_nothrow (int fd, void *buf, size_t count) |
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{ |
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ssize_t result; |
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TRY_MSVC_INVAL |
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{ |
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result = read (fd, buf, count); |
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} |
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CATCH_MSVC_INVAL |
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{ |
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result = -1; |
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errno = EBADF; |
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} |
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DONE_MSVC_INVAL; |
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return result; |
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} |
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# else |
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# define read_nothrow read |
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# endif |
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ssize_t |
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rpl_read (int fd, void *buf, size_t count) |
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{ |
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ssize_t ret = read_nothrow (fd, buf, count); |
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# if GNULIB_NONBLOCKING |
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if (ret < 0 |
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&& GetLastError () == ERROR_NO_DATA) |
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{ |
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HANDLE h = (HANDLE) _get_osfhandle (fd); |
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if (GetFileType (h) == FILE_TYPE_PIPE) |
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{ |
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/* h is a pipe or socket. */ |
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DWORD state; |
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if (GetNamedPipeHandleState (h, &state, NULL, NULL, NULL, NULL, 0) |
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&& (state & PIPE_NOWAIT) != 0) |
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/* h is a pipe in non-blocking mode. |
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Change errno from EINVAL to EAGAIN. */ |
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errno = EAGAIN; |
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} |
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} |
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# endif |
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return ret; |
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} |
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#endif
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