1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief Instantiate a Private User Environment |
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5 | * @ingroup LibIOEnv |
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6 | */ |
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7 | |
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8 | /* |
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9 | * Submitted by: fernando.ruiz@ctv.es (correo@fernando-ruiz.com) |
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10 | * |
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11 | * COPYRIGHT (c) 1989-2010. |
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12 | * On-Line Applications Research Corporation (OAR). |
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13 | * |
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14 | * The license and distribution terms for this file may be |
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15 | * found in the file LICENSE in this distribution or at |
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16 | * http://www.rtems.org/license/LICENSE. |
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17 | */ |
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18 | |
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19 | #if HAVE_CONFIG_H |
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20 | #include "config.h" |
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21 | #endif |
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22 | |
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23 | #include <stdlib.h> |
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24 | |
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25 | #include <rtems/libio_.h> |
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26 | #include <rtems/score/threadimpl.h> |
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27 | |
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28 | /** |
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29 | * Instantiate a private user environment for the calling thread. |
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30 | */ |
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31 | |
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32 | rtems_user_env_t * rtems_current_user_env_get(void) |
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33 | { |
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34 | void *ptr = pthread_getspecific(rtems_current_user_env_key); |
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35 | if (ptr == NULL) { |
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36 | ptr = &rtems_global_user_env; |
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37 | } |
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38 | return (rtems_user_env_t *) ptr; |
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39 | } |
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40 | |
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41 | void rtems_libio_free_user_env(void *arg) |
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42 | { |
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43 | rtems_user_env_t *env = arg; |
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44 | bool uses_global_env = env == &rtems_global_user_env; |
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45 | |
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46 | if (!uses_global_env) { |
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47 | rtems_filesystem_global_location_release(env->current_directory, false); |
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48 | rtems_filesystem_global_location_release(env->root_directory, false); |
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49 | free(env); |
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50 | } |
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51 | } |
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52 | |
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53 | rtems_status_code rtems_libio_set_private_env(void) |
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54 | { |
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55 | rtems_status_code sc = RTEMS_SUCCESSFUL; |
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56 | rtems_user_env_t *old_env = rtems_current_user_env; |
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57 | bool uses_global_env = old_env == &rtems_global_user_env; |
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58 | |
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59 | if (uses_global_env) { |
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60 | Thread_Life_state life_state = |
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61 | _Thread_Set_life_protection(THREAD_LIFE_PROTECTED); |
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62 | rtems_user_env_t *new_env = calloc(1, sizeof(*new_env)); |
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63 | |
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64 | if (new_env != NULL) { |
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65 | *new_env = *old_env; |
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66 | new_env->root_directory = |
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67 | rtems_filesystem_global_location_obtain(&old_env->root_directory); |
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68 | new_env->current_directory = |
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69 | rtems_filesystem_global_location_obtain(&old_env->current_directory); |
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70 | |
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71 | if ( |
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72 | !rtems_filesystem_global_location_is_null(new_env->root_directory) |
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73 | && !rtems_filesystem_global_location_is_null(new_env->current_directory) |
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74 | ) { |
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75 | int eno = pthread_setspecific( |
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76 | rtems_current_user_env_key, |
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77 | new_env |
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78 | ); |
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79 | |
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80 | if (eno == 0) { |
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81 | rtems_libio_free_user_env(old_env); |
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82 | } else { |
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83 | sc = RTEMS_TOO_MANY; |
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84 | } |
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85 | } else { |
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86 | sc = RTEMS_UNSATISFIED; |
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87 | } |
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88 | |
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89 | if (sc != RTEMS_SUCCESSFUL) { |
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90 | rtems_libio_free_user_env(new_env); |
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91 | } |
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92 | } else { |
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93 | sc = RTEMS_NO_MEMORY; |
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94 | } |
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95 | |
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96 | _Thread_Set_life_protection(life_state); |
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97 | } |
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98 | |
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99 | return sc; |
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100 | } |
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101 | |
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102 | void rtems_libio_use_global_env(void) |
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103 | { |
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104 | rtems_user_env_t *env = rtems_current_user_env; |
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105 | bool uses_private_env = env != &rtems_global_user_env; |
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106 | |
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107 | if (uses_private_env) { |
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108 | Thread_Life_state life_state = |
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109 | _Thread_Set_life_protection(THREAD_LIFE_PROTECTED); |
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110 | |
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111 | rtems_libio_free_user_env(env); |
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112 | pthread_setspecific(rtems_current_user_env_key, NULL); |
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113 | |
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114 | _Thread_Set_life_protection(life_state); |
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115 | } |
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116 | } |
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