Current File : //usr/include/bits/types/cookie_io_functions_t.h
/* Copyright (C) 1991-2018 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C 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.
The GNU C 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 the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#ifndef __cookie_io_functions_t_defined
#define __cookie_io_functions_t_defined 1
#include <bits/types.h>
/* Functions to do I/O and file management for a stream. */
/* Read NBYTES bytes from COOKIE into a buffer pointed to by BUF.
Return number of bytes read. */
typedef __ssize_t cookie_read_function_t (void *__cookie, char *__buf,
size_t __nbytes);
/* Write NBYTES bytes pointed to by BUF to COOKIE. Write all NBYTES bytes
unless there is an error. Return number of bytes written. If
there is an error, return 0 and do not write anything. If the file
has been opened for append (__mode.__append set), then set the file
pointer to the end of the file and then do the write; if not, just
write at the current file pointer. */
typedef __ssize_t cookie_write_function_t (void *__cookie, const char *__buf,
size_t __nbytes);
/* Move COOKIE's file position to *POS bytes from the
beginning of the file (if W is SEEK_SET),
the current position (if W is SEEK_CUR),
or the end of the file (if W is SEEK_END).
Set *POS to the new file position.
Returns zero if successful, nonzero if not. */
typedef int cookie_seek_function_t (void *__cookie, __off64_t *__pos, int __w);
/* Close COOKIE. */
typedef int cookie_close_function_t (void *__cookie);
/* The structure with the cookie function pointers.
The tag name of this struct is _IO_cookie_io_functions_t to
preserve historic C++ mangled names for functions taking
cookie_io_functions_t arguments. That name should not be used in
new code. */
typedef struct _IO_cookie_io_functions_t
{
cookie_read_function_t *read; /* Read bytes. */
cookie_write_function_t *write; /* Write bytes. */
cookie_seek_function_t *seek; /* Seek/tell file position. */
cookie_close_function_t *close; /* Close file. */
} cookie_io_functions_t;
#endif
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