| /* Copyright (C) 1991-2022 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 |
| <https://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 |