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/**
* @file
*
* @ingroup LibIOEnv
* @brief User Environment Support
*/
/*
* COPYRIGHT (c) 1989-2011.
* On-Line Applications Research Corporation (OAR).
*
* Modifications to support reference counting in the file system are
* Copyright (c) 2012 embedded brains GmbH.
*
* 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.
*/
#ifndef _RTEMS_USERENV_H
#define _RTEMS_USERENV_H
/*
* According to IEEE Std 1003.1-2001,
* limits.h is supposed to provide _POSIX_LOGIN_NAME_MAX
* XXX: We do not rely on this.
*/
#include <limits.h>
#include <rtems.h>
#include <rtems/fs.h>
#ifdef __cplusplus
extern "C" {
#endif
/**
* @defgroup LibIOEnv User Environment
*
* @ingroup LibIO
*
* @brief Provides a POSIX like user environment for tasks.
*/
/**@{**/
#ifndef LOGIN_NAME_MAX
#ifdef _POSIX_LOGIN_NAME_MAX
#define LOGIN_NAME_MAX _POSIX_LOGIN_NAME_MAX
#else
/* Fallback */
#define LOGIN_NAME_MAX 9
#endif
#endif
typedef struct {
rtems_filesystem_global_location_t *current_directory;
rtems_filesystem_global_location_t *root_directory;
/* Default mode for all files. */
mode_t umask;
/* _POSIX_types */
uid_t uid;
gid_t gid;
uid_t euid;
gid_t egid;
char login_buffer[LOGIN_NAME_MAX];
pid_t pgrp; /* process group id */
/* User environment maintenance */
rtems_id task_id;
int reference_count;
} rtems_user_env_t;
extern rtems_user_env_t * rtems_current_user_env;
extern rtems_user_env_t rtems_global_user_env;
#define rtems_filesystem_current (rtems_current_user_env->current_directory)
#define rtems_filesystem_root (rtems_current_user_env->root_directory)
#define rtems_filesystem_umask (rtems_current_user_env->umask)
#define _POSIX_types_Uid (rtems_current_user_env->uid)
#define _POSIX_types_Gid (rtems_current_user_env->gid)
#define _POSIX_types_Euid (rtems_current_user_env->euid)
#define _POSIX_types_Egid (rtems_current_user_env->egid)
#define _POSIX_types_Getlogin_buffer (rtems_current_user_env->login_buffer)
/**
* @brief Creates a private environment.
*
* If the task has already a private environment nothing will be changed. This
* function must be called from normal thread context and may block on a mutex.
* Thread dispatching is disabled to protect some critical sections.
*
* @retval RTEMS_SUCCESSFUL Successful operation.
* @retval RTEMS_NO_MEMORY Not enough memory.
* @retval RTEMS_UNSATISFIED Cloning of the current environment failed.
* @retval RTEMS_TOO_MANY Cannot register the private environment.
*/
rtems_status_code rtems_libio_set_private_env(void);
/**
* @brief Creates a private environment shared with another task.
*
* An attempt to share the environment with itself has no effect. This
* function must be called from normal thread context and may block on a mutex.
* Thread dispatching is disabled to protect some critical sections.
*
* @param[in] task_id The private environment is shared with the task specified
* by this identifier.
*
* @retval RTEMS_SUCCESSFUL Successful operation.
* @retval RTEMS_UNSATISFIED No shared environment is available for this task
* @retval RTEMS_TOO_MANY Cannot register the shared environment.
* identifier.
*/
rtems_status_code rtems_libio_share_private_env(rtems_id task_id) ;
/**
* @brief Use the global environment.
*
* A private environment will be released. This function may be called from
* every thread context. Thread dispatching is disabled to protect the
* critical sections.
*/
void rtems_libio_use_global_env(void);
/** @} */
#ifdef __cplusplus
}
#endif
#endif
/* end of include file */
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