FM / types

/usr/include/bits/types

Name	Size	Mode	Actions
clockid_t.h	174	0644	edit dl rm
clock_t.h	143	0644	edit dl rm
cookie_io_functions_t.h	2725	0644	edit dl rm
error_t.h	894	0644	edit dl rm
FILE.h	180	0644	edit dl rm
locale_t.h	983	0644	edit dl rm
mbstate_t.h	135	0644	edit dl rm
res_state.h	2009	0644	edit dl rm
sigevent_t.h	1204	0644	edit dl rm
siginfo_t.h	3892	0644	edit dl rm
sigset_t.h	195	0644	edit dl rm
sigval_t.h	599	0644	edit dl rm
sig_atomic_t.h	272	0644	edit dl rm
stack_t.h	1062	0644	edit dl rm
struct_FILE.h	4588	0644	edit dl rm
struct_iovec.h	1066	0644	edit dl rm
struct_itimerspec.h	288	0644	edit dl rm
struct_msqid64_ds.h	1094	0644	edit dl rm
struct_msqid64_ds_helper.h	1517	0644	edit dl rm
struct_msqid_ds.h	2127	0644	edit dl rm
struct_osockaddr.h	274	0644	edit dl rm
struct_rusage.h	4121	0644	edit dl rm
struct_sched_param.h	1073	0644	edit dl rm
struct_semid64_ds.h	1109	0644	edit dl rm
struct_semid64_ds_helper.h	1212	0644	edit dl rm
struct_semid_ds.h	1518	0644	edit dl rm
struct_shmid64_ds.h	1111	0644	edit dl rm
struct_shmid64_ds_helper.h	1353	0644	edit dl rm
struct_shmid_ds.h	1993	0644	edit dl rm
struct_sigstack.h	1073	0644	edit dl rm
struct_statx.h	1897	0644	edit dl rm
struct_statx_timestamp.h	1202	0644	edit dl rm
struct_timeb.h	413	0644	edit dl rm
struct_timespec.h	867	0644	edit dl rm
struct_timeval.h	411	0644	edit dl rm
struct_tm.h	760	0644	edit dl rm
struct___jmp_buf_tag.h	1467	0644	edit dl rm
timer_t.h	159	0644	edit dl rm
time_t.h	203	0644	edit dl rm
wint_t.h	796	0644	edit dl rm
__FILE.h	110	0644	edit dl rm
__fpos64_t.h	410	0644	edit dl rm
__fpos_t.h	381	0644	edit dl rm
__locale_t.h	1722	0644	edit dl rm
__mbstate_t.h	564	0644	edit dl rm
__sigset_t.h	206	0644	edit dl rm
__sigval_t.h	1148	0644	edit dl rm

Edit: /usr/include/bits/types/cookie_io_functions_t.h (2725B)

/* Copyright (C) 1991-2021 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

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