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genops.c
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/* Copyright (C) 1993,1995,1997-2002, 2003, 2004, 2006, 2007, 2011-2012
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/>.
As a special exception, if you link the code in this file with
files compiled with a GNU compiler to produce an executable,
that does not cause the resulting executable to be covered by
the GNU Lesser General Public License. This exception does not
however invalidate any other reasons why the executable file
might be covered by the GNU Lesser General Public License.
This exception applies to code released by its copyright holders
in files containing the exception. */
/* Generic or default I/O operations. */
#include "libioP.h"
#include <stdlib.h>
#include <string.h>
#include <stdbool.h>
#ifdef _LIBC
#include <sched.h>
#endif
#ifdef _IO_MTSAFE_IO
static _IO_lock_t list_all_lock = _IO_lock_initializer;
#endif
/* Used to signal modifications to the list of FILE decriptors. */
static int _IO_list_all_stamp;
static _IO_FILE *run_fp;
static void
flush_cleanup (void *not_used)
{
if (run_fp != NULL)
_IO_funlockfile (run_fp);
#ifdef _IO_MTSAFE_IO
_IO_lock_unlock (list_all_lock);
#endif
}
void
_IO_un_link (fp)
struct _IO_FILE_plus *fp;
{
if (fp->file._flags & _IO_LINKED)
{
struct _IO_FILE **f;
#ifdef _IO_MTSAFE_IO
_IO_cleanup_region_start_noarg (flush_cleanup);
_IO_lock_lock (list_all_lock);
run_fp = (_IO_FILE *) fp;
_IO_flockfile ((_IO_FILE *) fp);
#endif
if (_IO_list_all == NULL)
;
else if (fp == _IO_list_all)
{
_IO_list_all = (struct _IO_FILE_plus *) _IO_list_all->file._chain;
++_IO_list_all_stamp;
}
else
for (f = &_IO_list_all->file._chain; *f; f = &(*f)->_chain)
if (*f == (_IO_FILE *) fp)
{
*f = fp->file._chain;
++_IO_list_all_stamp;
break;
}
fp->file._flags &= ~_IO_LINKED;
#ifdef _IO_MTSAFE_IO
_IO_funlockfile ((_IO_FILE *) fp);
run_fp = NULL;
_IO_lock_unlock (list_all_lock);
_IO_cleanup_region_end (0);
#endif
}
}
libc_hidden_def (_IO_un_link)
void
_IO_link_in (fp)
struct _IO_FILE_plus *fp;
{
if ((fp->file._flags & _IO_LINKED) == 0)
{
fp->file._flags |= _IO_LINKED;
#ifdef _IO_MTSAFE_IO
_IO_cleanup_region_start_noarg (flush_cleanup);
_IO_lock_lock (list_all_lock);
run_fp = (_IO_FILE *) fp;
_IO_flockfile ((_IO_FILE *) fp);
#endif
fp->file._chain = (_IO_FILE *) _IO_list_all;
_IO_list_all = fp;
++_IO_list_all_stamp;
#ifdef _IO_MTSAFE_IO
_IO_funlockfile ((_IO_FILE *) fp);
run_fp = NULL;
_IO_lock_unlock (list_all_lock);
_IO_cleanup_region_end (0);
#endif
}
}
libc_hidden_def (_IO_link_in)
/* Return minimum _pos markers
Assumes the current get area is the main get area. */
_IO_ssize_t _IO_least_marker (_IO_FILE *fp, char *end_p);
_IO_ssize_t
_IO_least_marker (fp, end_p)
_IO_FILE *fp;
char *end_p;
{
_IO_ssize_t least_so_far = end_p - fp->_IO_read_base;
struct _IO_marker *mark;
for (mark = fp->_markers; mark != NULL; mark = mark->_next)
if (mark->_pos < least_so_far)
least_so_far = mark->_pos;
return least_so_far;
}
/* Switch current get area from backup buffer to (start of) main get area. */
void
_IO_switch_to_main_get_area (fp)
_IO_FILE *fp;
{
char *tmp;
fp->_flags &= ~_IO_IN_BACKUP;
/* Swap _IO_read_end and _IO_save_end. */
tmp = fp->_IO_read_end;
fp->_IO_read_end = fp->_IO_save_end;
fp->_IO_save_end= tmp;
/* Swap _IO_read_base and _IO_save_base. */
tmp = fp->_IO_read_base;
fp->_IO_read_base = fp->_IO_save_base;
fp->_IO_save_base = tmp;
/* Set _IO_read_ptr. */
fp->_IO_read_ptr = fp->_IO_read_base;
}
/* Switch current get area from main get area to (end of) backup area. */
void
_IO_switch_to_backup_area (fp)
_IO_FILE *fp;
{
char *tmp;
fp->_flags |= _IO_IN_BACKUP;
/* Swap _IO_read_end and _IO_save_end. */
tmp = fp->_IO_read_end;
fp->_IO_read_end = fp->_IO_save_end;
fp->_IO_save_end = tmp;
/* Swap _IO_read_base and _IO_save_base. */
tmp = fp->_IO_read_base;
fp->_IO_read_base = fp->_IO_save_base;
fp->_IO_save_base = tmp;
/* Set _IO_read_ptr. */
fp->_IO_read_ptr = fp->_IO_read_end;
}
int
_IO_switch_to_get_mode (fp)
_IO_FILE *fp;
{
if (fp->_IO_write_ptr > fp->_IO_write_base)
if (_IO_OVERFLOW (fp, EOF) == EOF)
return EOF;
if (_IO_in_backup (fp))
fp->_IO_read_base = fp->_IO_backup_base;
else
{
fp->_IO_read_base = fp->_IO_buf_base;
if (fp->_IO_write_ptr > fp->_IO_read_end)
fp->_IO_read_end = fp->_IO_write_ptr;
}
fp->_IO_read_ptr = fp->_IO_write_ptr;
fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = fp->_IO_read_ptr;
fp->_flags &= ~_IO_CURRENTLY_PUTTING;
return 0;
}
libc_hidden_def (_IO_switch_to_get_mode)
void
_IO_free_backup_area (fp)
_IO_FILE *fp;
{
if (_IO_in_backup (fp))
_IO_switch_to_main_get_area (fp); /* Just in case. */
free (fp->_IO_save_base);
fp->_IO_save_base = NULL;
fp->_IO_save_end = NULL;
fp->_IO_backup_base = NULL;
}
libc_hidden_def (_IO_free_backup_area)
#if 0
int
_IO_switch_to_put_mode (fp)
_IO_FILE *fp;
{
fp->_IO_write_base = fp->_IO_read_ptr;
fp->_IO_write_ptr = fp->_IO_read_ptr;
/* Following is wrong if line- or un-buffered? */
fp->_IO_write_end = (fp->_flags & _IO_IN_BACKUP
? fp->_IO_read_end : fp->_IO_buf_end);
fp->_IO_read_ptr = fp->_IO_read_end;
fp->_IO_read_base = fp->_IO_read_end;
fp->_flags |= _IO_CURRENTLY_PUTTING;
return 0;
}
#endif
int
__overflow (f, ch)
_IO_FILE *f;
int ch;
{
/* This is a single-byte stream. */
if (f->_mode == 0)
_IO_fwide (f, -1);
return _IO_OVERFLOW (f, ch);
}
libc_hidden_def (__overflow)
static int save_for_backup (_IO_FILE *fp, char *end_p)
#ifdef _LIBC
internal_function
#endif
;
static int
#ifdef _LIBC
internal_function
#endif
save_for_backup (fp, end_p)
_IO_FILE *fp;
char *end_p;
{
/* Append [_IO_read_base..end_p] to backup area. */
_IO_ssize_t least_mark = _IO_least_marker (fp, end_p);
/* needed_size is how much space we need in the backup area. */
_IO_size_t needed_size = (end_p - fp->_IO_read_base) - least_mark;
/* FIXME: Dubious arithmetic if pointers are NULL */
_IO_size_t current_Bsize = fp->_IO_save_end - fp->_IO_save_base;
_IO_size_t avail; /* Extra space available for future expansion. */
_IO_ssize_t delta;
struct _IO_marker *mark;
if (needed_size > current_Bsize)
{
char *new_buffer;
avail = 100;
new_buffer = (char *) malloc (avail + needed_size);
if (new_buffer == NULL)
return EOF; /* FIXME */
if (least_mark < 0)
{
#ifdef _LIBC
__mempcpy (__mempcpy (new_buffer + avail,
fp->_IO_save_end + least_mark,
-least_mark),
fp->_IO_read_base,
end_p - fp->_IO_read_base);
#else
memcpy (new_buffer + avail,
fp->_IO_save_end + least_mark,
-least_mark);
memcpy (new_buffer + avail - least_mark,
fp->_IO_read_base,
end_p - fp->_IO_read_base);
#endif
}
else
memcpy (new_buffer + avail,
fp->_IO_read_base + least_mark,
needed_size);
free (fp->_IO_save_base);
fp->_IO_save_base = new_buffer;
fp->_IO_save_end = new_buffer + avail + needed_size;
}
else
{
avail = current_Bsize - needed_size;
if (least_mark < 0)
{
memmove (fp->_IO_save_base + avail,
fp->_IO_save_end + least_mark,
-least_mark);
memcpy (fp->_IO_save_base + avail - least_mark,
fp->_IO_read_base,
end_p - fp->_IO_read_base);
}
else if (needed_size > 0)
memcpy (fp->_IO_save_base + avail,
fp->_IO_read_base + least_mark,
needed_size);
}
fp->_IO_backup_base = fp->_IO_save_base + avail;
/* Adjust all the streammarkers. */
delta = end_p - fp->_IO_read_base;
for (mark = fp->_markers; mark != NULL; mark = mark->_next)
mark->_pos -= delta;
return 0;
}
int
__underflow (fp)
_IO_FILE *fp;
{
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
if (_IO_vtable_offset (fp) == 0 && _IO_fwide (fp, -1) != -1)
return EOF;
#endif
if (fp->_mode == 0)
_IO_fwide (fp, -1);
if (_IO_in_put_mode (fp))
if (_IO_switch_to_get_mode (fp) == EOF)
return EOF;
if (fp->_IO_read_ptr < fp->_IO_read_end)
return *(unsigned char *) fp->_IO_read_ptr;
if (_IO_in_backup (fp))
{
_IO_switch_to_main_get_area (fp);
if (fp->_IO_read_ptr < fp->_IO_read_end)
return *(unsigned char *) fp->_IO_read_ptr;
}
if (_IO_have_markers (fp))
{
if (save_for_backup (fp, fp->_IO_read_end))
return EOF;
}
else if (_IO_have_backup (fp))
_IO_free_backup_area (fp);
return _IO_UNDERFLOW (fp);
}
libc_hidden_def (__underflow)
int
__uflow (fp)
_IO_FILE *fp;
{
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
if (_IO_vtable_offset (fp) == 0 && _IO_fwide (fp, -1) != -1)
return EOF;
#endif
if (fp->_mode == 0)
_IO_fwide (fp, -1);
if (_IO_in_put_mode (fp))
if (_IO_switch_to_get_mode (fp) == EOF)
return EOF;
if (fp->_IO_read_ptr < fp->_IO_read_end)
return *(unsigned char *) fp->_IO_read_ptr++;
if (_IO_in_backup (fp))
{
_IO_switch_to_main_get_area (fp);
if (fp->_IO_read_ptr < fp->_IO_read_end)
return *(unsigned char *) fp->_IO_read_ptr++;
}
if (_IO_have_markers (fp))
{
if (save_for_backup (fp, fp->_IO_read_end))
return EOF;
}
else if (_IO_have_backup (fp))
_IO_free_backup_area (fp);
return _IO_UFLOW (fp);
}
libc_hidden_def (__uflow)
void
_IO_setb (f, b, eb, a)
_IO_FILE *f;
char *b;
char *eb;
int a;
{
if (f->_IO_buf_base && !(f->_flags & _IO_USER_BUF))
FREE_BUF (f->_IO_buf_base, _IO_blen (f));
f->_IO_buf_base = b;
f->_IO_buf_end = eb;
if (a)
f->_flags &= ~_IO_USER_BUF;
else
f->_flags |= _IO_USER_BUF;
}
libc_hidden_def (_IO_setb)
void
_IO_doallocbuf (fp)
_IO_FILE *fp;
{
if (fp->_IO_buf_base)
return;
if (!(fp->_flags & _IO_UNBUFFERED) || fp->_mode > 0)
if (_IO_DOALLOCATE (fp) != EOF)
return;
_IO_setb (fp, fp->_shortbuf, fp->_shortbuf+1, 0);
}
libc_hidden_def (_IO_doallocbuf)
int
_IO_default_underflow (fp)
_IO_FILE *fp;
{
return EOF;
}
int
_IO_default_uflow (fp)
_IO_FILE *fp;
{
int ch = _IO_UNDERFLOW (fp);
if (ch == EOF)
return EOF;
return *(unsigned char *) fp->_IO_read_ptr++;
}
libc_hidden_def (_IO_default_uflow)
_IO_size_t
_IO_default_xsputn (f, data, n)
_IO_FILE *f;
const void *data;
_IO_size_t n;
{
const char *s = (char *) data;
_IO_size_t more = n;
if (more <= 0)
return 0;
for (;;)
{
/* Space available. */
if (f->_IO_write_ptr < f->_IO_write_end)
{
_IO_size_t count = f->_IO_write_end - f->_IO_write_ptr;
if (count > more)
count = more;
if (count > 20)
{
#ifdef _LIBC
f->_IO_write_ptr = __mempcpy (f->_IO_write_ptr, s, count);
#else
memcpy (f->_IO_write_ptr, s, count);
f->_IO_write_ptr += count;
#endif
s += count;
}
else if (count)
{
char *p = f->_IO_write_ptr;
_IO_ssize_t i;
for (i = count; --i >= 0; )
*p++ = *s++;
f->_IO_write_ptr = p;
}
more -= count;
}
if (more == 0 || _IO_OVERFLOW (f, (unsigned char) *s++) == EOF)
break;
more--;
}
return n - more;
}
libc_hidden_def (_IO_default_xsputn)
_IO_size_t
_IO_sgetn (fp, data, n)
_IO_FILE *fp;
void *data;
_IO_size_t n;
{
/* FIXME handle putback buffer here! */
return _IO_XSGETN (fp, data, n);
}
libc_hidden_def (_IO_sgetn)
_IO_size_t
_IO_default_xsgetn (fp, data, n)
_IO_FILE *fp;
void *data;
_IO_size_t n;
{
_IO_size_t more = n;
char *s = (char*) data;
for (;;)
{
/* Data available. */
if (fp->_IO_read_ptr < fp->_IO_read_end)
{
_IO_size_t count = fp->_IO_read_end - fp->_IO_read_ptr;
if (count > more)
count = more;
if (count > 20)
{
#ifdef _LIBC
s = __mempcpy (s, fp->_IO_read_ptr, count);
#else
memcpy (s, fp->_IO_read_ptr, count);
s += count;
#endif
fp->_IO_read_ptr += count;
}
else if (count)
{
char *p = fp->_IO_read_ptr;
int i = (int) count;
while (--i >= 0)
*s++ = *p++;
fp->_IO_read_ptr = p;
}
more -= count;
}
if (more == 0 || __underflow (fp) == EOF)
break;
}
return n - more;
}
libc_hidden_def (_IO_default_xsgetn)
#if 0
/* Seems not to be needed. --drepper */
int
_IO_sync (fp)
_IO_FILE *fp;
{
return 0;
}
#endif
_IO_FILE *
_IO_default_setbuf (fp, p, len)
_IO_FILE *fp;
char *p;
_IO_ssize_t len;
{
if (_IO_SYNC (fp) == EOF)
return NULL;
if (p == NULL || len == 0)
{
fp->_flags |= _IO_UNBUFFERED;
_IO_setb (fp, fp->_shortbuf, fp->_shortbuf+1, 0);
}
else
{
fp->_flags &= ~_IO_UNBUFFERED;
_IO_setb (fp, p, p+len, 0);
}
fp->_IO_write_base = fp->_IO_write_ptr = fp->_IO_write_end = 0;
fp->_IO_read_base = fp->_IO_read_ptr = fp->_IO_read_end = 0;
return fp;
}
_IO_off64_t
_IO_default_seekpos (fp, pos, mode)
_IO_FILE *fp;
_IO_off64_t pos;
int mode;
{
return _IO_SEEKOFF (fp, pos, 0, mode);
}
int
_IO_default_doallocate (fp)
_IO_FILE *fp;
{
char *buf;
ALLOC_BUF (buf, _IO_BUFSIZ, EOF);
_IO_setb (fp, buf, buf+_IO_BUFSIZ, 1);
return 1;
}
libc_hidden_def (_IO_default_doallocate)
void
_IO_init (fp, flags)
_IO_FILE *fp;
int flags;
{
_IO_no_init (fp, flags, -1, NULL, NULL);
}
libc_hidden_def (_IO_init)
void
_IO_old_init (fp, flags)
_IO_FILE *fp;
int flags;
{
fp->_flags = _IO_MAGIC|flags;
fp->_flags2 = 0;
fp->_IO_buf_base = NULL;
fp->_IO_buf_end = NULL;
fp->_IO_read_base = NULL;
fp->_IO_read_ptr = NULL;
fp->_IO_read_end = NULL;
fp->_IO_write_base = NULL;
fp->_IO_write_ptr = NULL;
fp->_IO_write_end = NULL;
fp->_chain = NULL; /* Not necessary. */
fp->_IO_save_base = NULL;
fp->_IO_backup_base = NULL;
fp->_IO_save_end = NULL;
fp->_markers = NULL;
fp->_cur_column = 0;
#if _IO_JUMPS_OFFSET
fp->_vtable_offset = 0;
#endif
#ifdef _IO_MTSAFE_IO
if (fp->_lock != NULL)
_IO_lock_init (*fp->_lock);
#endif
}
void
_IO_no_init (fp, flags, orientation, wd, jmp)
_IO_FILE *fp;
int flags;
int orientation;
struct _IO_wide_data *wd;
const struct _IO_jump_t *jmp;
{
_IO_old_init (fp, flags);
fp->_mode = orientation;
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
if (orientation >= 0)
{
fp->_wide_data = wd;
fp->_wide_data->_IO_buf_base = NULL;
fp->_wide_data->_IO_buf_end = NULL;
fp->_wide_data->_IO_read_base = NULL;
fp->_wide_data->_IO_read_ptr = NULL;
fp->_wide_data->_IO_read_end = NULL;
fp->_wide_data->_IO_write_base = NULL;
fp->_wide_data->_IO_write_ptr = NULL;
fp->_wide_data->_IO_write_end = NULL;
fp->_wide_data->_IO_save_base = NULL;
fp->_wide_data->_IO_backup_base = NULL;
fp->_wide_data->_IO_save_end = NULL;
fp->_wide_data->_wide_vtable = jmp;
}
#endif
fp->_freeres_list = NULL;
}
int
_IO_default_sync (fp)
_IO_FILE *fp;
{
return 0;
}
/* The way the C++ classes are mapped into the C functions in the
current implementation, this function can get called twice! */
void
_IO_default_finish (fp, dummy)
_IO_FILE *fp;
int dummy;
{
struct _IO_marker *mark;
if (fp->_IO_buf_base && !(fp->_flags & _IO_USER_BUF))
{
FREE_BUF (fp->_IO_buf_base, _IO_blen (fp));
fp->_IO_buf_base = fp->_IO_buf_end = NULL;
}
for (mark = fp->_markers; mark != NULL; mark = mark->_next)
mark->_sbuf = NULL;
if (fp->_IO_save_base)
{
free (fp->_IO_save_base);
fp->_IO_save_base = NULL;
}
_IO_un_link ((struct _IO_FILE_plus *) fp);
#ifdef _IO_MTSAFE_IO
if (fp->_lock != NULL)
_IO_lock_fini (*fp->_lock);
#endif
}
libc_hidden_def (_IO_default_finish)
_IO_off64_t
_IO_default_seekoff (fp, offset, dir, mode)
_IO_FILE *fp;
_IO_off64_t offset;
int dir;
int mode;
{
return _IO_pos_BAD;
}
int
_IO_sputbackc (fp, c)
_IO_FILE *fp;
int c;
{
int result;
if (fp->_IO_read_ptr > fp->_IO_read_base
&& (unsigned char)fp->_IO_read_ptr[-1] == (unsigned char)c)
{
fp->_IO_read_ptr--;
result = (unsigned char) c;
}
else
result = _IO_PBACKFAIL (fp, c);
if (result != EOF)
fp->_flags &= ~_IO_EOF_SEEN;
return result;
}
libc_hidden_def (_IO_sputbackc)
int
_IO_sungetc (fp)
_IO_FILE *fp;
{
int result;
if (fp->_IO_read_ptr > fp->_IO_read_base)
{
fp->_IO_read_ptr--;
result = (unsigned char) *fp->_IO_read_ptr;
}
else
result = _IO_PBACKFAIL (fp, EOF);
if (result != EOF)
fp->_flags &= ~_IO_EOF_SEEN;
return result;
}
#if 0 /* Work in progress */
/* Seems not to be needed. */
#if 0
void
_IO_set_column (fp, c)
_IO_FILE *fp;
int c;
{
if (c == -1)
fp->_column = -1;
else
fp->_column = c - (fp->_IO_write_ptr - fp->_IO_write_base);
}
#else
int
_IO_set_column (fp, i)
_IO_FILE *fp;
int i;
{
fp->_cur_column = i + 1;
return 0;
}
#endif
#endif
unsigned
_IO_adjust_column (start, line, count)
unsigned start;
const char *line;
int count;
{
const char *ptr = line + count;
while (ptr > line)
if (*--ptr == '\n')
return line + count - ptr - 1;
return start + count;
}
libc_hidden_def (_IO_adjust_column)
#if 0
/* Seems not to be needed. --drepper */
int
_IO_get_column (fp)
_IO_FILE *fp;
{
if (fp->_cur_column)
return _IO_adjust_column (fp->_cur_column - 1,
fp->_IO_write_base,
fp->_IO_write_ptr - fp->_IO_write_base);
return -1;
}
#endif
int
_IO_flush_all_lockp (int do_lock)
{
int result = 0;
struct _IO_FILE *fp;
int last_stamp;
#ifdef _IO_MTSAFE_IO
__libc_cleanup_region_start (do_lock, flush_cleanup, 0);
if (do_lock)
_IO_lock_lock (list_all_lock);
#endif
last_stamp = _IO_list_all_stamp;
fp = (_IO_FILE *) _IO_list_all;
while (fp != NULL)
{
run_fp = fp;
if (do_lock)
_IO_flockfile (fp);
if (((fp->_mode <= 0 && fp->_IO_write_ptr > fp->_IO_write_base)
#if defined _LIBC || defined _GLIBCPP_USE_WCHAR_T
|| (_IO_vtable_offset (fp) == 0
&& fp->_mode > 0 && (fp->_wide_data->_IO_write_ptr
> fp->_wide_data->_IO_write_base))
#endif
)
&& _IO_OVERFLOW (fp, EOF) == EOF)
result = EOF;
if (do_lock)
_IO_funlockfile (fp);
run_fp = NULL;
if (last_stamp != _IO_list_all_stamp)
{
/* Something was added to the list. Start all over again. */
fp = (_IO_FILE *) _IO_list_all;
last_stamp = _IO_list_all_stamp;
}
else
fp = fp->_chain;
}
#ifdef _IO_MTSAFE_IO
if (do_lock)
_IO_lock_unlock (list_all_lock);
__libc_cleanup_region_end (0);
#endif
return result;
}
int
_IO_flush_all ()
{
/* We want locking. */
return _IO_flush_all_lockp (1);
}
libc_hidden_def (_IO_flush_all)
void
_IO_flush_all_linebuffered ()
{
struct _IO_FILE *fp;
int last_stamp;
#ifdef _IO_MTSAFE_IO
_IO_cleanup_region_start_noarg (flush_cleanup);
_IO_lock_lock (list_all_lock);
#endif
last_stamp = _IO_list_all_stamp;
fp = (_IO_FILE *) _IO_list_all;
while (fp != NULL)
{
run_fp = fp;
_IO_flockfile (fp);
if ((fp->_flags & _IO_NO_WRITES) == 0 && fp->_flags & _IO_LINE_BUF)
_IO_OVERFLOW (fp, EOF);
_IO_funlockfile (fp);
run_fp = NULL;
if (last_stamp != _IO_list_all_stamp)
{
/* Something was added to the list. Start all over again. */
fp = (_IO_FILE *) _IO_list_all;
last_stamp = _IO_list_all_stamp;
}
else
fp = fp->_chain;
}
#ifdef _IO_MTSAFE_IO
_IO_lock_unlock (list_all_lock);
_IO_cleanup_region_end (0);
#endif
}
libc_hidden_def (_IO_flush_all_linebuffered)
#ifdef _LIBC
weak_alias (_IO_flush_all_linebuffered, _flushlbf)
#endif
/* The following is a bit tricky. In general, we want to unbuffer the
streams so that all output which follows is seen. If we are not
looking for memory leaks it does not make much sense to free the
actual buffer because this will happen anyway once the program
terminated. If we do want to look for memory leaks we have to free
the buffers. Whether something is freed is determined by the
function sin the libc_freeres section. Those are called as part of
the atexit routine, just like _IO_cleanup. The problem is we do
not know whether the freeres code is called first or _IO_cleanup.
if the former is the case, we set the DEALLOC_BUFFER variable to
true and _IO_unbuffer_write will take care of the rest. If
_IO_unbuffer_write is called first we add the streams to a list
which the freeres function later can walk through. */
static void _IO_unbuffer_write (void);
static bool dealloc_buffers;
static _IO_FILE *freeres_list;
static void
_IO_unbuffer_write (void)
{
struct _IO_FILE *fp;
for (fp = (_IO_FILE *) _IO_list_all; fp; fp = fp->_chain)
{
if (! (fp->_flags & _IO_UNBUFFERED)
&& (! (fp->_flags & _IO_NO_WRITES)
|| (fp->_flags & _IO_IS_APPENDING))
/* Iff stream is un-orientated, it wasn't used. */
&& fp->_mode != 0)
{
int cnt;
#define MAXTRIES 2
for (cnt = 0; cnt < MAXTRIES; ++cnt)
if (fp->_lock == NULL || _IO_lock_trylock (*fp->_lock) == 0)
break;
else
/* Give the other thread time to finish up its use of the
stream. */
__sched_yield ();
if (! dealloc_buffers && !(fp->_flags & _IO_USER_BUF))
{
fp->_flags |= _IO_USER_BUF;
fp->_freeres_list = freeres_list;
freeres_list = fp;
fp->_freeres_buf = fp->_IO_buf_base;
fp->_freeres_size = _IO_blen (fp);
}
_IO_SETBUF (fp, NULL, 0);
if (cnt < MAXTRIES && fp->_lock != NULL)
_IO_lock_unlock (*fp->_lock);
}
/* Make sure that never again the wide char functions can be
used. */
fp->_mode = -1;
}
}
libc_freeres_fn (buffer_free)
{
dealloc_buffers = true;
while (freeres_list != NULL)
{
FREE_BUF (freeres_list->_freeres_buf, freeres_list->_freeres_size);
freeres_list = freeres_list->_freeres_list;
}
}