96 lines
2.3 KiB
C
96 lines
2.3 KiB
C
|
/* POSIX compatible read() function.
|
||
|
|
Copyright (C) 2008-2022 Free Software Foundation, Inc.
|
||
|
|
Written by Bruno Haible <bruno@clisp.org>, 2011.
|
||
|
|
|
||
|
|
This file is free software: you can redistribute it and/or modify
|
||
|
|
it under the terms of the GNU Lesser General Public License as
|
||
|
|
published by the Free Software Foundation; either version 2.1 of the
|
||
|
|
License, or (at your option) any later version.
|
||
|
|
|
||
|
|
This file 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 Lesser General Public License for more details.
|
||
|
|
|
||
|
|
You should have received a copy of the GNU Lesser General Public License
|
||
|
|
along with this program. If not, see <https://www.gnu.org/licenses/>. */
|
||
|
|
|
||
|
|
#include <config.h>
|
||
|
|
|
||
|
|
/* Specification. */
|
||
|
|
#include <unistd.h>
|
||
|
|
|
||
|
|
#if defined _WIN32 && ! defined __CYGWIN__
|
||
|
|
|
||
|
|
# include <errno.h>
|
||
|
|
# include <io.h>
|
||
|
|
|
||
|
|
# define WIN32_LEAN_AND_MEAN /* avoid including junk */
|
||
|
|
# include <windows.h>
|
||
|
|
|
||
|
|
# if HAVE_MSVC_INVALID_PARAMETER_HANDLER
|
||
|
|
# include "msvc-inval.h"
|
||
|
|
# endif
|
||
|
|
# if GNULIB_MSVC_NOTHROW
|
||
|
|
# include "msvc-nothrow.h"
|
||
|
|
# else
|
||
|
|
# include <io.h>
|
||
|
|
# endif
|
||
|
|
|
||
|
|
/* Don't assume that UNICODE is not defined. */
|
||
|
|
# undef GetNamedPipeHandleState
|
||
|
|
# define GetNamedPipeHandleState GetNamedPipeHandleStateA
|
||
|
|
|
||
|
|
# 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
|