gambas-source-code/main/gbx/gbx_stream_pipe.c

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/***************************************************************************
stream_pipe.c
(c) 2000-2007 Benoit Minisini <gambas@users.sourceforge.net>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 1, or (at your option)
any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
***************************************************************************/
#define __STREAM_IMPL_C
#include "gb_common.h"
#include "gb_error.h"
#include "gbx_value.h"
#include "gb_limit.h"
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include "gbx_stream.h"
#define FD (stream->direct.fd)
static int stream_open(STREAM *stream, const char *path, int mode)
{
int fd;
int fmode;
if (mkfifo(path, 0666) != 0)
{
if (errno != EEXIST)
return TRUE;
}
fmode = 0;
switch (mode & ST_MODE)
{
case ST_READ: fmode |= O_RDONLY; break;
case ST_WRITE: fmode |= O_WRONLY; break;
case ST_READ_WRITE: fmode |= O_RDWR; break;
default: fmode |= O_RDONLY;
}
fd = open(path, fmode);
if (fd < 0)
return TRUE;
stream->direct.size = 0;
FD = fd;
return FALSE;
}
static int stream_close(STREAM *stream)
{
if (close(FD) < 0)
return TRUE;
FD = -1;
return FALSE;
}
static int stream_read(STREAM *stream, char *buffer, long len)
{
return STREAM_read_direct(FD, buffer, len);
}
static int stream_getchar(STREAM *stream, char *buffer)
{
return read(FD, buffer, 1) <= 0;
}
static int stream_write(STREAM *stream, char *buffer, long len)
{
return STREAM_write_direct(FD, buffer, len);
}
static int stream_seek(STREAM *stream, long long pos, int whence)
{
return TRUE;
}
static int stream_tell(STREAM *stream, long long *pos)
{
return TRUE;
}
static int stream_flush(STREAM *stream)
{
return FALSE;
}
/*static int stream_eof(STREAM *stream)
{
int ilen;
if (STREAM_get_readable(FD, &ilen))
return TRUE;
return (ilen == 0);
}*/
#define stream_eof NULL
/*static int stream_lof(STREAM *stream, long long *len)
{
*len = 0;
return FALSE;
}*/
#define stream_lof NULL
static int stream_handle(STREAM *stream)
{
return FD;
}
DECLARE_STREAM(STREAM_pipe);