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1026 |
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/*
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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.OARcorp.com/rtems/license.html.
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*
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* privateenv.c,v 1.3 2002/01/06 20:11:37 joel Exp
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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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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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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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sc = rtems_task_variable_add(RTEMS_SELF,(void*)&rtems_current_user_env,free);
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if (sc != RTEMS_SUCCESSFUL) return sc;
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rtems_current_user_env = malloc(sizeof(rtems_user_env_t));
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if (!rtems_current_user_env)
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return RTEMS_NO_MEMORY;
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};
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/* the side effect desired . chroot("/") */
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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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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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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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free(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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};
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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) return sc;
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/* don't free(NULL'ed) at the task_delete. It is a shared var... */
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sc = rtems_task_variable_add(RTEMS_SELF,(void*)&rtems_current_user_env,NULL);
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if (sc != RTEMS_SUCCESSFUL) return sc;
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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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return RTEMS_SUCCESSFUL;
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}
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