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cookie_io_functions_t.h
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/* 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