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/**
* @file
*
* @brief Instantiate a Private User Environment
* @ingroup LibIOEnv
*/
/*
* Submitted by: fernando.ruiz@ctv.es (correo@fernando-ruiz.com)
*
* COPYRIGHT (c) 1989-2010.
* On-Line Applications Research Corporation (OAR).
*
* The license and distribution terms for this file may be
* found in the file LICENSE in this distribution or at
* http://www.rtems.org/license/LICENSE.
*/
#if HAVE_CONFIG_H
#include "config.h"
#endif
#include <stdlib.h>
#include <rtems/libio_.h>
#include <rtems/score/threadimpl.h>
/**
* Instantiate a private user environment for the calling thread.
*/
rtems_user_env_t * rtems_current_user_env_get(void)
{
void *ptr = pthread_getspecific(rtems_current_user_env_key);
if (ptr == NULL) {
ptr = &rtems_global_user_env;
}
return (rtems_user_env_t *) ptr;
}
void rtems_libio_free_user_env(void *arg)
{
rtems_user_env_t *env = arg;
bool uses_global_env = env == &rtems_global_user_env;
if (!uses_global_env) {
rtems_filesystem_global_location_release(env->current_directory);
rtems_filesystem_global_location_release(env->root_directory);
free(env);
}
}
rtems_status_code rtems_libio_set_private_env(void)
{
rtems_status_code sc = RTEMS_SUCCESSFUL;
rtems_user_env_t *old_env = rtems_current_user_env;
bool uses_global_env = old_env == &rtems_global_user_env;
if (uses_global_env) {
bool life_protection = _Thread_Set_life_protection(true);
rtems_user_env_t *new_env = calloc(1, sizeof(*new_env));
if (new_env != NULL) {
*new_env = *old_env;
new_env->root_directory =
rtems_filesystem_global_location_obtain(&old_env->root_directory);
new_env->current_directory =
rtems_filesystem_global_location_obtain(&old_env->current_directory);
if (
!rtems_filesystem_global_location_is_null(new_env->root_directory)
&& !rtems_filesystem_global_location_is_null(new_env->current_directory)
) {
int eno = pthread_setspecific(
rtems_current_user_env_key,
new_env
);
if (eno == 0) {
rtems_libio_free_user_env(old_env);
} else {
sc = RTEMS_TOO_MANY;
}
} else {
sc = RTEMS_UNSATISFIED;
}
if (sc != RTEMS_SUCCESSFUL) {
rtems_libio_free_user_env(new_env);
}
} else {
sc = RTEMS_NO_MEMORY;
}
_Thread_Set_life_protection(life_protection);
}
return sc;
}
void rtems_libio_use_global_env(void)
{
rtems_user_env_t *env = rtems_current_user_env;
bool uses_private_env = env != &rtems_global_user_env;
if (uses_private_env) {
bool life_protection = _Thread_Set_life_protection(true);
rtems_libio_free_user_env(env);
pthread_setspecific(rtems_current_user_env_key, NULL);
_Thread_Set_life_protection(life_protection);
}
}
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