92 lines
2.1 KiB
C
92 lines
2.1 KiB
C
/* POSIX compatible read() function.
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Copyright (C) 2008-2020 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 <https://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 __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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# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
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# include "msvc-inval.h"
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# endif
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# if GNULIB_MSVC_NOTHROW
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# include "msvc-nothrow.h"
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# else
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# include <io.h>
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# endif
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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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