/*
* Implementation of hooks for the CYGNUS newlib libc
* These hooks set things up so that:
* + '_REENT' is switched at task switch time.
*
* COPYRIGHT (c) 1994 by Division Incorporated
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.com/license/LICENSE.
*
* $Id$
*
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#define __RTEMS_VIOLATE_KERNEL_VISIBILITY__
#include <rtems.h>
#if defined(RTEMS_NEWLIB)
#include <rtems/libcsupport.h>
/* Since we compile with strict ANSI we need to undef it to get
* prototypes for extensions
*/
#undef __STRICT_ANSI__
#include <stdlib.h> /* for free() */
#include <string.h> /* for memset() */
#include <sys/reent.h> /* for extern of _REENT (aka _impure_ptr) */
#include <errno.h>
/*
* NOTE:
* There is some problem with doing this on the hpux version
* of the UNIX simulator (symptom is printf core dumps), so
* we just don't for now.
* Not sure if this is a problem with hpux, newlib, or something else.
*/
#if defined(RTEMS_UNIX) && !defined(hpux)
#define NEED_SETVBUF
#endif
#include <stdio.h>
int _fwalk(struct _reent *ptr, int (*function) (FILE *) );
struct _reent libc_global_reent
__ATTRIBUTE_IMPURE_PTR__ = _REENT_INIT(libc_global_reent);
/*
* reent struct allocation moved here from libc_start_hook() to avoid
* mutual exclusion problems when memory is allocated from the start hook.
*
* Memory is also now allocated from the workspace rather than the heap.
* -- ptorre 9/30/03
*/
rtems_boolean libc_create_hook(
rtems_tcb *current_task,
rtems_tcb *creating_task
)
{
struct _reent *ptr;
/* NOTE: The RTEMS malloc is reentrant without a reent ptr since
* it is based on the Classic API Region Manager.
*/
#define REENT_MALLOCED 0
#if REENT_MALLOCED
ptr = (struct _reent *) calloc(1, sizeof(struct _reent));
#else
/* It is OK to allocate from the workspace because these
* hooks run with thread dispatching disabled.
*/
ptr = (struct _reent *) _Workspace_Allocate(sizeof(struct _reent));
#endif
if (ptr) {
_REENT_INIT_PTR((ptr)); /* GCC extension: structure constants */
creating_task->libc_reent = ptr;
return TRUE;
}
else
return FALSE;
}
/*
* Called for all user TASKS (system tasks are MPCI Receive Server and IDLE)
*/
#ifdef NEED_SETVBUF
rtems_extension libc_begin_hook(rtems_tcb *current_task)
{
setvbuf( stdout, NULL, _IOLBF, BUFSIZ );
}
#endif
/*
* Called when a task is deleted.
* Must restore the new lib reentrancy state for the new current
* task.
*
*/
int newlib_free_buffers(
FILE *fp
)
{
switch ( fileno(fp) ) {
case 0:
case 1:
case 2:
if (fp->_flags & __SMBF) {
free( fp->_bf._base );
fp->_flags &= ~__SMBF;
fp->_bf._base = fp->_p = (unsigned char *) NULL;
}
break;
default:
fclose(fp);
}
return 0;
}
rtems_extension libc_delete_hook(
rtems_tcb *current_task,
rtems_tcb *deleted_task
)
{
struct _reent *ptr;
/*
* The reentrancy structure was allocated by newlib using malloc()
*/
if (current_task == deleted_task) {
ptr = _REENT;
} else {
ptr = deleted_task->libc_reent;
}
if (ptr && ptr != &libc_global_reent) {
/*
_wrapup_reent(ptr);
_reclaim_reent(ptr);
*/
/*
* Just in case there are some buffers lying around.
*/
_fwalk(ptr, newlib_free_buffers);
#if REENT_MALLOCED
free(ptr);
#else
_Workspace_Free(ptr);
#endif
}
deleted_task->libc_reent = NULL;
/*
* Require the switch back to another task to install its own
*/
if ( current_task == deleted_task ) {
_REENT = 0;
}
}
/*
* Init libc for CYGNUS newlib
*
* Set up _REENT to use our global libc_global_reent.
* (newlib provides a global of its own, but we prefer our own name for it)
*
* If reentrancy is desired (which it should be), then
* we install the task extension hooks to maintain the
* newlib reentrancy global variable _REENT on task
* create, delete, switch, exit, etc.
*
*/
void
libc_init(int reentrant)
{
_REENT = &libc_global_reent;
_Thread_Set_libc_reent (&_REENT);
}
#endif
