forked from Imagelibrary/rtems
164 lines
4.3 KiB
C
164 lines
4.3 KiB
C
/*
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* Instantatiate a private user environment for the calling thread.
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*
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* Submitted by: fernando.ruiz@ctv.es (correo@fernando-ruiz.com)
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*
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* COPYRIGHT (c) 1989-2000.
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* On-Line Applications Research Corporation (OAR).
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*
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* The license and distribution terms for this file may be
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* found in the file LICENSE in this distribution or at
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* http://www.rtems.com/license/LICENSE.
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*
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* $Id$
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*/
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#if HAVE_CONFIG_H
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#include "config.h"
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#endif
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#include <stdlib.h> /* free */
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#include <rtems.h>
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#include <rtems/libio.h>
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#include <rtems/libio_.h>
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extern Chain_Control rtems_filesystem_mount_table_control;
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#define THE_ROOT_FS_LOC \
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(((rtems_filesystem_mount_table_entry_t*)\
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rtems_filesystem_mount_table_control.first)->mt_fs_root)
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/* cleanup a user environment
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* NOTE: this must be called with
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* thread dispatching disabled!
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*/
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static void
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free_user_env(void *venv)
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{
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rtems_user_env_t *env = (rtems_user_env_t*) venv ;
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if (env != &rtems_global_user_env
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#ifdef HAVE_USERENV_REFCNT
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&& --env->refcnt <= 0
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#endif
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) {
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rtems_filesystem_freenode( &env->current_directory);
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rtems_filesystem_freenode( &env->root_directory);
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free(env);
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}
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}
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rtems_status_code rtems_libio_set_private_env(void) {
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rtems_status_code sc;
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rtems_id task_id;
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rtems_filesystem_location_info_t loc;
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sc=rtems_task_ident(RTEMS_SELF,0,&task_id);
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if (sc != RTEMS_SUCCESSFUL) return sc;
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/* Only for the first time a malloc is necesary */
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if (rtems_current_user_env==&rtems_global_user_env) {
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rtems_user_env_t *tmp = malloc(sizeof(rtems_user_env_t));
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if (!tmp)
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return RTEMS_NO_MEMORY;
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#ifdef HAVE_USERENV_REFCNT
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tmp->refcnt = 1;
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#endif
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sc = rtems_task_variable_add(RTEMS_SELF,(void*)&rtems_current_user_env,(void(*)(void *))free_user_env);
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if (sc != RTEMS_SUCCESSFUL) {
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/* don't use free_user_env because the pathlocs are
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* not initialized yet
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*/
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free(tmp);
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return sc;
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}
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rtems_current_user_env = tmp;
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};
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*rtems_current_user_env = rtems_global_user_env; /* get the global values*/
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rtems_current_user_env->task_id=task_id; /* mark the local values*/
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/* get a clean root */
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rtems_filesystem_root = THE_ROOT_FS_LOC;
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/* Clone the pathlocs. In contrast to most other
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* code we must _not_ free the original locs because
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* what we are trying to do here is forking off
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* clones.
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*/
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rtems_filesystem_evaluate_path("/", 0, &loc, 0);
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rtems_filesystem_root = loc;
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rtems_filesystem_evaluate_path("/", 0, &loc, 0);
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rtems_filesystem_current = loc;
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return RTEMS_SUCCESSFUL;
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}
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/*
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* Share a same private environment beetween two task:
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* Task_id (remote) and RTEMS_SELF(current).
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*/
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/* NOTE:
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*
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* THIS CODE HAS NO PROTECTION IMPLEMENTED
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*
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* Tasks who wish to share their environments must
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*
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* a) assert that no participants are concurrently
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* executing
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* libio_share_private_env() and/or libio_set_private_env()
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*
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* b) mutex access to rtems_filesystem_current, rtems_filesytem_root
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* while changing any of those (chdir(), chroot()).
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*/
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#ifndef HAVE_USERENV_REFCNT
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rtems_status_code rtems_libio_share_private_env(rtems_id task_id) {
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rtems_status_code sc;
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rtems_user_env_t * shared_user_env;
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rtems_id current_task_id;
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sc=rtems_task_ident(RTEMS_SELF,0,¤t_task_id);
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if (sc != RTEMS_SUCCESSFUL) return sc;
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if (rtems_current_user_env->task_id==current_task_id) {
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/* kill the current user env & task_var*/
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rtems_user_env_t *tmp = rtems_current_user_env;
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sc = rtems_task_variable_delete(RTEMS_SELF,(void*)&rtems_current_user_env);
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if (sc != RTEMS_SUCCESSFUL) return sc;
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free_user_env(tmp);
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};
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/* AT THIS POINT, rtems_current_user_env is DANGLING */
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sc = rtems_task_variable_get(task_id,(void*)&rtems_current_user_env,
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(void*)&shared_user_env );
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if (sc != RTEMS_SUCCESSFUL)
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goto bailout;
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sc = rtems_task_variable_add(RTEMS_SELF,(void*)&rtems_current_user_env,free_user_env);
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if (sc != RTEMS_SUCCESSFUL)
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goto bailout;
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/* the current_user_env is the same pointer that remote env */
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rtems_current_user_env = shared_user_env;
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/* increase the reference count */
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#ifdef HAVE_USERENV_REFCNT
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rtems_current_user_env->refcnt++;
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#endif
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return RTEMS_SUCCESSFUL;
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bailout:
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/* fallback to the global env */
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rtems_current_user_env = &rtems_global_user_env;
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return sc;
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}
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#endif
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