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/*
tio.h - timed io functions
This file is part of the nss-pam-ldapd library.
Copyright (C) 2007, 2008, 2010, 2012 Arthur de Jong
This library 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 library 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 library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
TODO: Add some documentation here.
the SIGPIPE signal should be ignored (is ignored in this code)
This library is not thread safe. You cannot share TFILE objects between
threads and expect to be able to read and write from them in different
threads. All the state is in the TFILE object so calls to this library on
different objects can be done in parallel.
*/
#ifndef COMMON__TIO_H
#define COMMON__TIO_H
#include <sys/time.h>
#include <sys/types.h>
#include "compat/attrs.h"
/* This is a generic file handle used for reading and writing
(something like FILE from stdio.h). */
typedef struct tio_fileinfo TFILE;
/* Open a new TFILE based on the file descriptor. The timeout is set for any
operation. The timeout value is copied so may be dereferenced after the
call. */
TFILE *tio_fdopen(int fd,struct timeval *readtimeout,struct timeval *writetimeout,
size_t initreadsize,size_t maxreadsize,
size_t initwritesize,size_t maxwritesize)
LIKE_MALLOC MUST_USE;
/* Read the specified number of bytes from the stream. */
int tio_read(TFILE *fp,void *buf,size_t count);
/* Read and discard the specified number of bytes from the stream.
If count is 0 reads and discards any data that can be read and empties
the read buffer. */
int tio_skip(TFILE *fp,size_t count);
/* Write the specified buffer to the stream. */
int tio_write(TFILE *fp,const void *buf,size_t count);
/* Write out all buffered data to the stream. */
int tio_flush(TFILE *fp);
/* Flush the streams and closes the underlying file descriptor. */
int tio_close(TFILE *fp);
/* Store the current position in the stream so that we can jump back to it
with the tio_reset() function. */
void tio_mark(TFILE *fp);
/* Rewinds the stream to the point set by tio_mark(). Note that this only
resets the read stream and not the write stream. This function returns
whether the reset was successful (this function may fail if the buffers
were full). */
int tio_reset(TFILE *fp);
#endif /* COMMON__TIO_H */
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