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/*
* ProFTPD - FTP server daemon
* Copyright (c) 1997, 1998 Public Flood Software
*
* 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 2 of the License, 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
*/
/* Connection streams, ring-buffers and other goodies related to
* non-blocking I/O
* $Id: io.h,v 1.2 1999/03/05 02:53:23 flood Exp $
*/
#ifndef __IO_H
#define __IO_H
#define IO_READ 0
#define IO_WRITE 1
#define IOR_REMOVE (1 << 0) /* Request scheduled for removal */
#define IOR_CLOSED (1 << 1) /* File is closed */
#define IOR_ERROR (1 << 2) /* Request resulted in error */
#define IOR_REMOVE_FILE (1 << 3) /* Destroy associated file */
#define IO_NONBLOCK (1 << 0) /* No longer used?!? */
#define IO_INTR (1 << 1) /* Indicates that io_* funcs are
allowed to be interrupted
by EINTR, and return -2
*/
#define IO_NORESTART (1 << 2) /* Indicates that io_* funcs should
not automagically restart
if read() or write() should
return EWOULDBLOCK/EAGAIN
The default is to restart.
*/
#define IO_ABORT (1 << 3) /* temporary internal flag used
to indicated that i/o on
an IOFILE has been been
aborted and should return -2
at the next possible instant.
In combintation with IO_INTR
and interruptable syscalls
this should be near instantly.
This flag cannot be tested
for as it is cleared immediately
after being detected
*/
typedef struct IO_File IOFILE;
typedef struct IO_Buffer IOBUF;
typedef struct IO_Request IOREQ;
struct IO_File {
pool *pool; /* Each one has it's own pool */
int fd; /* File descriptor */
int mode; /* 0 == read, 1 == write */
int xerrno; /* errno if applicable */
int flags;
unsigned int restart_secs;
IOBUF *buf;
IOREQ *req; /* Request buffer */
int bufsize; /* Default size of request buffer */
};
struct IO_Buffer {
char *buf,*cp;
int left,bufsize;
};
/* cl_read can be used during write operations to asyncronously gather
* data from a function. If cl_read returns -1, an error is assumed,
* otherwise 0 == EOF (write completed)
*/
struct IO_Request {
IOREQ *next,*prev;
pool *pool;
int req_type; /* Read or Write */
int req_flags; /* Request flags */
IOFILE *file;
char *buf;
char *bp,*bufnext;
int bufsize; /* Buffer size */
char *cl_buf,*cl_bp; /* Client buffer, and head pointer */
int cl_bytes; /* Bytes remaining in client buffer */
int (*cl_io)(IOREQ*,char*,int); /* Client io function (for async operations) */
void (*cl_err)(IOREQ*,int); /* Error occured */
void (*cl_close)(IOREQ*); /* Remote side closed */
};
/* Prototypes */
void init_io();
IOFILE *io_open(pool*,int,int);
IOFILE *io_reopen(IOFILE*,int,int);
int io_poll(IOFILE*);
int io_close(IOFILE*);
int io_write(IOFILE*,char*,int);
int io_write_async(IOFILE*,char*,int);
int io_read(IOFILE*,char*,int,int);
int io_printf(IOFILE*,char*,...);
int io_printf_async(IOFILE*,char*,...);
void io_abort(IOFILE*);
void io_set_restart(IOFILE*,int);
void io_set_poll_sleep(IOFILE*,unsigned int);
char *io_gets(char*,int,IOFILE*);
char *io_telnet_gets(char*,int,IOFILE*,IOFILE*);
void io_set_errno(IOFILE *f, int xerrno);
#endif /* __IO_H */
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