1 | /* |
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2 | * NOTE: The structure of the routines is identical to that of POSIX |
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3 | * Message_queues to leave the option of having unnamed message |
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4 | * queues at a future date. They are currently not part of the |
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5 | * POSIX standard but unnamed message_queues are. This is also |
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6 | * the reason for the apparently unnecessary tracking of |
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7 | * the process_shared attribute. [In addition to the fact that |
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8 | * it would be trivial to add pshared to the mq_attr structure |
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9 | * and have process private message queues.] |
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10 | * |
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11 | * This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open |
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12 | * time. |
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13 | * |
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14 | * $Id$ |
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15 | */ |
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16 | |
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17 | #include <stdarg.h> |
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18 | |
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19 | #include <pthread.h> |
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20 | #include <limits.h> |
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21 | #include <errno.h> |
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22 | #include <fcntl.h> |
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23 | #include <mqueue.h> |
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24 | |
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25 | #include <rtems/system.h> |
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26 | #include <rtems/score/watchdog.h> |
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27 | #include <rtems/posix/seterr.h> |
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28 | #include <rtems/posix/mqueue.h> |
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29 | #include <rtems/posix/time.h> |
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30 | |
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31 | /*PAGE |
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32 | * |
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33 | * _POSIX_Message_queue_Manager_initialization |
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34 | * |
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35 | * This routine initializes all message_queue manager related data structures. |
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36 | * |
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37 | * Input parameters: |
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38 | * maximum_message_queues - maximum configured message_queues |
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39 | * |
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40 | * Output parameters: NONE |
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41 | */ |
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42 | |
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43 | void _POSIX_Message_queue_Manager_initialization( |
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44 | unsigned32 maximum_message_queues |
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45 | ) |
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46 | { |
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47 | _Objects_Initialize_information( |
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48 | &_POSIX_Message_queue_Information, |
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49 | OBJECTS_POSIX_MESSAGE_QUEUES, |
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50 | TRUE, |
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51 | maximum_message_queues, |
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52 | sizeof( POSIX_Message_queue_Control ), |
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53 | TRUE, |
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54 | _POSIX_PATH_MAX, |
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55 | FALSE |
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56 | ); |
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57 | } |
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58 | |
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59 | /*PAGE |
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60 | * |
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61 | * _POSIX_Message_queue_Create_support |
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62 | */ |
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63 | |
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64 | int _POSIX_Message_queue_Create_support( |
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65 | const char *name, |
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66 | int pshared, |
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67 | unsigned int oflag, |
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68 | struct mq_attr *attr, |
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69 | POSIX_Message_queue_Control **message_queue |
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70 | ) |
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71 | { |
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72 | POSIX_Message_queue_Control *the_mq; |
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73 | |
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74 | _Thread_Disable_dispatch(); |
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75 | |
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76 | the_mq = _POSIX_Message_queue_Allocate(); |
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77 | |
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78 | if ( !the_mq ) { |
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79 | _Thread_Enable_dispatch(); |
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80 | set_errno_and_return_minus_one( ENFILE ); |
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81 | } |
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82 | |
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83 | #if defined(RTEMS_MULTIPROCESSING) |
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84 | if ( pshared == PTHREAD_PROCESS_SHARED && |
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85 | !( _Objects_MP_Allocate_and_open( &_POSIX_Message_queue_Information, 0, |
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86 | the_mq->Object.id, FALSE ) ) ) { |
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87 | _POSIX_Message_queue_Free( the_mq ); |
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88 | _Thread_Enable_dispatch(); |
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89 | set_errno_and_return_minus_one( ENFILE ); |
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90 | } |
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91 | #endif |
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92 | |
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93 | the_mq->process_shared = pshared; |
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94 | |
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95 | if ( name ) { |
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96 | the_mq->named = TRUE; |
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97 | the_mq->open_count = 1; |
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98 | the_mq->linked = TRUE; |
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99 | } |
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100 | else |
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101 | the_mq->named = FALSE; |
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102 | |
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103 | if ( oflag & O_NONBLOCK ) |
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104 | the_mq->blocking = FALSE; |
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105 | else |
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106 | the_mq->blocking = TRUE; |
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107 | |
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108 | /* XXX |
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109 | * |
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110 | * Note that this should be based on the current scheduling policy. |
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111 | */ |
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112 | |
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113 | /* XXX |
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114 | * |
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115 | * Message and waiting disciplines are not distinguished. |
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116 | */ |
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117 | /* |
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118 | the_mq_attr->message_discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO; |
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119 | the_mq_attr->waiting_discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO; |
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120 | */ |
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121 | |
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122 | the_mq->Message_queue.Attributes.discipline = |
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123 | CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO; |
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124 | |
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125 | if ( ! _CORE_message_queue_Initialize( |
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126 | &the_mq->Message_queue, |
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127 | OBJECTS_POSIX_MESSAGE_QUEUES, |
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128 | &the_mq->Message_queue.Attributes, |
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129 | attr->mq_maxmsg, |
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130 | attr->mq_msgsize, |
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131 | #if defined(RTEMS_MULTIPROCESSING) |
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132 | _POSIX_Message_queue_MP_Send_extract_proxy |
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133 | #else |
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134 | NULL |
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135 | #endif |
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136 | ) ) { |
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137 | |
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138 | #if defined(RTEMS_MULTIPROCESSING) |
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139 | if ( pshared == PTHREAD_PROCESS_SHARED ) |
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140 | _Objects_MP_Close( &_POSIX_Message_queue_Information, the_mq->Object.id ); |
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141 | #endif |
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142 | |
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143 | _POSIX_Message_queue_Free( the_mq ); |
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144 | _Thread_Enable_dispatch(); |
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145 | set_errno_and_return_minus_one( ENOSPC ); |
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146 | } |
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147 | |
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148 | |
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149 | /* XXX - need Names to be a string!!! */ |
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150 | _Objects_Open( |
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151 | &_POSIX_Message_queue_Information, |
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152 | &the_mq->Object, |
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153 | (char *) name |
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154 | ); |
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155 | |
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156 | *message_queue = the_mq; |
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157 | |
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158 | #if defined(RTEMS_MULTIPROCESSING) |
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159 | if ( pshared == PTHREAD_PROCESS_SHARED ) |
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160 | _POSIX_Message_queue_MP_Send_process_packet( |
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161 | POSIX_MESSAGE_QUEUE_MP_ANNOUNCE_CREATE, |
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162 | the_mq->Object.id, |
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163 | (char *) name, |
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164 | 0 /* Not used */ |
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165 | ); |
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166 | #endif |
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167 | |
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168 | _Thread_Enable_dispatch(); |
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169 | return 0; |
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170 | } |
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171 | |
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172 | /*PAGE |
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173 | * |
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174 | * 15.2.2 Open a Message Queue, P1003.1b-1993, p. 272 |
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175 | */ |
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176 | |
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177 | mqd_t mq_open( |
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178 | const char *name, |
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179 | int oflag, |
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180 | ... |
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181 | /* mode_t mode, */ |
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182 | /* struct mq_attr attr */ |
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183 | ) |
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184 | { |
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185 | va_list arg; |
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186 | mode_t mode; |
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187 | struct mq_attr *attr; |
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188 | int status; |
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189 | Objects_Id the_mq_id; |
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190 | POSIX_Message_queue_Control *the_mq; |
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191 | |
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192 | if ( oflag & O_CREAT ) { |
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193 | va_start(arg, oflag); |
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194 | mode = (mode_t) va_arg( arg, mode_t * ); |
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195 | attr = (struct mq_attr *) va_arg( arg, struct mq_attr ** ); |
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196 | va_end(arg); |
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197 | } |
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198 | |
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199 | status = _POSIX_Message_queue_Name_to_id( name, &the_mq_id ); |
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200 | |
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201 | /* |
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202 | * If the name to id translation worked, then the message queue exists |
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203 | * and we can just return a pointer to the id. Otherwise we may |
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204 | * need to check to see if this is a "message queue does not exist" |
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205 | * or some other miscellaneous error on the name. |
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206 | */ |
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207 | |
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208 | if ( status ) { |
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209 | |
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210 | if ( status == EINVAL ) { /* name -> ID translation failed */ |
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211 | if ( !(oflag & O_CREAT) ) { /* willing to create it? */ |
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212 | set_errno_and_return_minus_one( ENOENT ); |
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213 | return (mqd_t) -1; |
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214 | } |
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215 | /* we are willing to create it */ |
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216 | } |
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217 | set_errno_and_return_minus_one( status ); /* some type of error */ |
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218 | return (mqd_t) -1; |
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219 | |
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220 | } else { /* name -> ID translation succeeded */ |
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221 | |
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222 | if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) { |
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223 | set_errno_and_return_minus_one( EEXIST ); |
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224 | return (mqd_t) -1; |
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225 | } |
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226 | |
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227 | /* |
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228 | * XXX In this case we need to do an ID->pointer conversion to |
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229 | * check the mode. This is probably a good place for a subroutine. |
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230 | */ |
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231 | |
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232 | the_mq->open_count += 1; |
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233 | |
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234 | return (mqd_t)&the_mq->Object.id; |
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235 | |
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236 | } |
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237 | |
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238 | /* XXX verify this comment... |
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239 | * |
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240 | * At this point, the message queue does not exist and everything has been |
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241 | * checked. We should go ahead and create a message queue. |
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242 | */ |
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243 | |
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244 | status = _POSIX_Message_queue_Create_support( |
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245 | name, |
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246 | TRUE, /* shared across processes */ |
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247 | oflag, |
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248 | attr, |
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249 | &the_mq |
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250 | ); |
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251 | |
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252 | if ( status == -1 ) |
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253 | return (mqd_t) -1; |
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254 | |
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255 | return (mqd_t) &the_mq->Object.id; |
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256 | } |
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257 | |
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258 | /*PAGE |
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259 | * |
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260 | * _POSIX_Message_queue_Delete |
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261 | */ |
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262 | |
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263 | void _POSIX_Message_queue_Delete( |
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264 | POSIX_Message_queue_Control *the_mq |
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265 | ) |
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266 | { |
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267 | if ( !the_mq->linked && !the_mq->open_count ) { |
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268 | _POSIX_Message_queue_Free( the_mq ); |
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269 | |
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270 | #if defined(RTEMS_MULTIPROCESSING) |
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271 | if ( the_mq->process_shared == PTHREAD_PROCESS_SHARED ) { |
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272 | |
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273 | _Objects_MP_Close( |
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274 | &_POSIX_Message_queue_Information, |
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275 | the_mq->Object.id |
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276 | ); |
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277 | |
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278 | _POSIX_Message_queue_MP_Send_process_packet( |
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279 | POSIX_MESSAGE_QUEUE_MP_ANNOUNCE_DELETE, |
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280 | the_mq->Object.id, |
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281 | 0, /* Not used */ |
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282 | 0 /* Not used */ |
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283 | ); |
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284 | } |
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285 | #endif |
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286 | |
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287 | } |
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288 | } |
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289 | |
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290 | /*PAGE |
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291 | * |
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292 | * 15.2.2 Close a Message Queue, P1003.1b-1993, p. 275 |
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293 | */ |
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294 | |
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295 | int mq_close( |
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296 | mqd_t mqdes |
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297 | ) |
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298 | { |
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299 | register POSIX_Message_queue_Control *the_mq; |
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300 | Objects_Locations location; |
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301 | |
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302 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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303 | switch ( location ) { |
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304 | case OBJECTS_ERROR: |
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305 | set_errno_and_return_minus_one( EINVAL ); |
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306 | case OBJECTS_REMOTE: |
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307 | _Thread_Dispatch(); |
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308 | return POSIX_MP_NOT_IMPLEMENTED(); |
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309 | set_errno_and_return_minus_one( EINVAL ); |
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310 | case OBJECTS_LOCAL: |
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311 | the_mq->open_count -= 1; |
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312 | _POSIX_Message_queue_Delete( the_mq ); |
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313 | _Thread_Enable_dispatch(); |
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314 | return 0; |
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315 | } |
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316 | return POSIX_BOTTOM_REACHED(); |
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317 | } |
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318 | |
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319 | /*PAGE |
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320 | * |
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321 | * 15.2.2 Remove a Message Queue, P1003.1b-1993, p. 276 |
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322 | */ |
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323 | |
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324 | int mq_unlink( |
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325 | const char *name |
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326 | ) |
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327 | { |
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328 | int status; |
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329 | register POSIX_Message_queue_Control *the_mq; |
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330 | Objects_Id the_mq_id; |
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331 | Objects_Locations location; |
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332 | |
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333 | status = _POSIX_Message_queue_Name_to_id( name, &the_mq_id ); |
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334 | |
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335 | if ( !status ) |
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336 | set_errno_and_return_minus_one( status ); |
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337 | |
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338 | the_mq = _POSIX_Message_queue_Get( the_mq_id, &location ); |
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339 | switch ( location ) { |
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340 | case OBJECTS_ERROR: |
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341 | set_errno_and_return_minus_one( EINVAL ); |
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342 | case OBJECTS_REMOTE: |
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343 | _Thread_Dispatch(); |
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344 | return POSIX_MP_NOT_IMPLEMENTED(); |
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345 | set_errno_and_return_minus_one( EINVAL ); |
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346 | case OBJECTS_LOCAL: |
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347 | |
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348 | #if defined(RTEMS_MULTIPROCESSING) |
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349 | _Objects_MP_Close( |
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350 | &_POSIX_Message_queue_Information, |
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351 | the_mq->Object.id |
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352 | ); |
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353 | #endif |
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354 | |
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355 | the_mq->linked = FALSE; |
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356 | |
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357 | _POSIX_Message_queue_Delete( the_mq ); |
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358 | |
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359 | _Thread_Enable_dispatch(); |
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360 | return 0; |
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361 | } |
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362 | return POSIX_BOTTOM_REACHED(); |
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363 | } |
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364 | |
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365 | /*PAGE |
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366 | * |
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367 | * _POSIX_Message_queue_Send_support |
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368 | */ |
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369 | |
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370 | int _POSIX_Message_queue_Send_support( |
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371 | mqd_t mqdes, |
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372 | const char *msg_ptr, |
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373 | unsigned32 msg_len, |
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374 | Priority_Control msg_prio, |
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375 | Watchdog_Interval timeout |
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376 | ) |
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377 | { |
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378 | register POSIX_Message_queue_Control *the_mq; |
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379 | Objects_Locations location; |
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380 | |
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381 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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382 | switch ( location ) { |
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383 | case OBJECTS_ERROR: |
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384 | set_errno_and_return_minus_one( EINVAL ); |
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385 | case OBJECTS_REMOTE: |
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386 | _Thread_Dispatch(); |
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387 | return POSIX_MP_NOT_IMPLEMENTED(); |
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388 | set_errno_and_return_minus_one( EINVAL ); |
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389 | case OBJECTS_LOCAL: |
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390 | /* XXX must add support for timeout and priority */ |
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391 | _CORE_message_queue_Send( |
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392 | &the_mq->Message_queue, |
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393 | (void *) msg_ptr, |
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394 | msg_len, |
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395 | mqdes, |
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396 | #if defined(RTEMS_MULTIPROCESSING) |
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397 | NULL /* XXX _POSIX_Message_queue_Core_message_queue_mp_support*/ |
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398 | #else |
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399 | NULL |
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400 | #endif |
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401 | ); |
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402 | _Thread_Enable_dispatch(); |
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403 | return _Thread_Executing->Wait.return_code; |
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404 | } |
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405 | return POSIX_BOTTOM_REACHED(); |
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406 | } |
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407 | |
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408 | /*PAGE |
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409 | * |
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410 | * 15.2.4 Send a Message to a Message Queue, P1003.1b-1993, p. 277 |
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411 | * |
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412 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedsend(). |
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413 | */ |
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414 | |
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415 | int mq_send( |
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416 | mqd_t mqdes, |
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417 | const char *msg_ptr, |
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418 | size_t msg_len, |
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419 | unsigned int msg_prio |
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420 | ) |
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421 | { |
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422 | return _POSIX_Message_queue_Send_support( |
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423 | mqdes, |
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424 | msg_ptr, |
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425 | msg_len, |
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426 | msg_prio, |
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427 | THREAD_QUEUE_WAIT_FOREVER |
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428 | ); |
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429 | } |
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430 | |
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431 | /*PAGE |
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432 | * |
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433 | * 15.2.4 Send a Message to a Message Queue, P1003.1b-1993, p. 277 |
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434 | * |
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435 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedsend(). |
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436 | */ |
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437 | |
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438 | int mq_timedsend( |
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439 | mqd_t mqdes, |
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440 | const char *msg_ptr, |
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441 | size_t msg_len, |
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442 | unsigned int msg_prio, |
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443 | const struct timespec *timeout |
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444 | ) |
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445 | { |
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446 | return _POSIX_Message_queue_Send_support( |
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447 | mqdes, |
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448 | msg_ptr, |
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449 | msg_len, |
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450 | msg_prio, |
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451 | _POSIX_Timespec_to_interval( timeout ) |
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452 | ); |
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453 | } |
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454 | |
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455 | /*PAGE |
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456 | * |
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457 | * _POSIX_Message_queue_Receive_support |
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458 | */ |
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459 | |
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460 | /* XXX be careful ... watch the size going through all the layers ... */ |
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461 | |
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462 | ssize_t _POSIX_Message_queue_Receive_support( |
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463 | mqd_t mqdes, |
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464 | char *msg_ptr, |
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465 | size_t msg_len, |
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466 | unsigned int *msg_prio, |
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467 | Watchdog_Interval timeout |
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468 | ) |
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469 | { |
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470 | register POSIX_Message_queue_Control *the_mq; |
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471 | Objects_Locations location; |
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472 | unsigned32 status = 0; |
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473 | unsigned32 length_out; |
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474 | |
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475 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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476 | switch ( location ) { |
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477 | case OBJECTS_ERROR: |
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478 | set_errno_and_return_minus_one( EINVAL ); |
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479 | case OBJECTS_REMOTE: |
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480 | _Thread_Dispatch(); |
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481 | return POSIX_MP_NOT_IMPLEMENTED(); |
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482 | set_errno_and_return_minus_one( EINVAL ); |
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483 | case OBJECTS_LOCAL: |
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484 | /* XXX need to define the options argument to this */ |
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485 | length_out = msg_len; |
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486 | _CORE_message_queue_Seize( |
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487 | &the_mq->Message_queue, |
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488 | mqdes, |
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489 | msg_ptr, |
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490 | &length_out, |
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491 | /* msg_prio, XXXX */ |
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492 | the_mq->blocking, |
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493 | timeout |
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494 | ); |
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495 | _Thread_Enable_dispatch(); |
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496 | if ( !status ) |
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497 | return length_out; |
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498 | /* XXX --- the return codes gotta be looked at .. fix this */ |
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499 | return _Thread_Executing->Wait.return_code; |
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500 | } |
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501 | return POSIX_BOTTOM_REACHED(); |
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502 | } |
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503 | |
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504 | /*PAGE |
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505 | * |
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506 | * 15.2.5 Receive a Message From a Message Queue, P1003.1b-1993, p. 279 |
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507 | * |
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508 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedreceive(). |
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509 | */ |
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510 | |
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511 | ssize_t mq_receive( |
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512 | mqd_t mqdes, |
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513 | char *msg_ptr, |
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514 | size_t msg_len, |
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515 | unsigned int *msg_prio |
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516 | ) |
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517 | { |
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518 | return _POSIX_Message_queue_Receive_support( |
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519 | mqdes, |
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520 | msg_ptr, |
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521 | msg_len, |
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522 | msg_prio, |
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523 | THREAD_QUEUE_WAIT_FOREVER |
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524 | ); |
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525 | } |
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526 | |
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527 | /*PAGE |
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528 | * |
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529 | * 15.2.5 Receive a Message From a Message Queue, P1003.1b-1993, p. 279 |
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530 | * |
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531 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedreceive(). |
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532 | */ |
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533 | |
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534 | int mq_timedreceive( /* XXX: should this be ssize_t */ |
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535 | mqd_t mqdes, |
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536 | char *msg_ptr, |
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537 | size_t msg_len, |
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538 | unsigned int *msg_prio, |
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539 | const struct timespec *timeout |
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540 | ) |
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541 | { |
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542 | return _POSIX_Message_queue_Receive_support( |
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543 | mqdes, |
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544 | msg_ptr, |
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545 | msg_len, |
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546 | msg_prio, |
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547 | _POSIX_Timespec_to_interval( timeout ) |
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548 | ); |
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549 | } |
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550 | |
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551 | /*PAGE |
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552 | * |
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553 | * _POSIX_Message_queue_Notify_handler |
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554 | * |
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555 | */ |
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556 | |
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557 | void _POSIX_Message_queue_Notify_handler( |
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558 | void *user_data |
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559 | ) |
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560 | { |
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561 | POSIX_Message_queue_Control *the_mq; |
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562 | |
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563 | the_mq = user_data; |
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564 | |
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565 | /* XXX do something with signals here!!!! */ |
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566 | } |
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567 | |
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568 | /*PAGE |
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569 | * |
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570 | * 15.2.6 Notify Process that a Message is Available on a Queue, |
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571 | * P1003.1b-1993, p. 280 |
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572 | */ |
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573 | |
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574 | int mq_notify( |
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575 | mqd_t mqdes, |
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576 | const struct sigevent *notification |
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577 | ) |
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578 | { |
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579 | register POSIX_Message_queue_Control *the_mq; |
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580 | Objects_Locations location; |
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581 | |
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582 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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583 | switch ( location ) { |
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584 | case OBJECTS_ERROR: |
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585 | set_errno_and_return_minus_one( EBADF ); |
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586 | case OBJECTS_REMOTE: |
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587 | _Thread_Dispatch(); |
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588 | return POSIX_MP_NOT_IMPLEMENTED(); |
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589 | set_errno_and_return_minus_one( EINVAL ); |
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590 | case OBJECTS_LOCAL: |
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591 | if ( notification ) { |
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592 | if ( _CORE_message_queue_Is_notify_enabled( &the_mq->Message_queue ) ) { |
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593 | _Thread_Enable_dispatch(); |
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594 | set_errno_and_return_minus_one( EBUSY ); |
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595 | } |
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596 | |
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597 | _CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL ); |
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598 | |
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599 | the_mq->notification = *notification; |
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600 | |
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601 | _CORE_message_queue_Set_notify( |
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602 | &the_mq->Message_queue, |
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603 | _POSIX_Message_queue_Notify_handler, |
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604 | the_mq |
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605 | ); |
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606 | } else { |
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607 | |
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608 | _CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL ); |
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609 | |
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610 | } |
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611 | |
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612 | _Thread_Enable_dispatch(); |
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613 | return 0; |
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614 | } |
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615 | return POSIX_BOTTOM_REACHED(); |
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616 | } |
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617 | |
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618 | /*PAGE |
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619 | * |
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620 | * 15.2.7 Set Message Queue Attributes, P1003.1b-1993, p. 281 |
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621 | */ |
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622 | |
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623 | int mq_setattr( |
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624 | mqd_t mqdes, |
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625 | const struct mq_attr *mqstat, |
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626 | struct mq_attr *omqstat |
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627 | ) |
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628 | { |
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629 | register POSIX_Message_queue_Control *the_mq; |
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630 | Objects_Locations location; |
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631 | CORE_message_queue_Attributes *the_mq_attr; |
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632 | |
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633 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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634 | switch ( location ) { |
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635 | case OBJECTS_ERROR: |
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636 | set_errno_and_return_minus_one( EINVAL ); |
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637 | case OBJECTS_REMOTE: |
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638 | _Thread_Dispatch(); |
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639 | return POSIX_MP_NOT_IMPLEMENTED(); |
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640 | set_errno_and_return_minus_one( EINVAL ); |
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641 | case OBJECTS_LOCAL: |
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642 | /* |
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643 | * Return the old values. |
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644 | */ |
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645 | |
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646 | /* XXX this is the same stuff as is in mq_getattr... and probably */ |
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647 | /* XXX should be in an inlined private routine */ |
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648 | |
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649 | the_mq_attr = &the_mq->Message_queue.Attributes; |
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650 | |
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651 | omqstat->mq_flags = the_mq->flags; |
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652 | omqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size; |
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653 | omqstat->mq_maxmsg = the_mq->Message_queue.maximum_pending_messages; |
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654 | omqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages; |
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655 | |
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656 | /* |
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657 | * Ignore everything except the O_NONBLOCK bit. |
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658 | */ |
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659 | |
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660 | if ( mqstat->mq_flags & O_NONBLOCK ) |
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661 | the_mq->blocking = FALSE; |
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662 | else |
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663 | the_mq->blocking = TRUE; |
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664 | |
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665 | the_mq->flags = mqstat->mq_flags; |
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666 | |
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667 | _Thread_Enable_dispatch(); |
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668 | return 0; |
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669 | } |
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670 | return POSIX_BOTTOM_REACHED(); |
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671 | } |
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672 | |
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673 | /*PAGE |
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674 | * |
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675 | * 15.2.8 Get Message Queue Attributes, P1003.1b-1993, p. 283 |
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676 | */ |
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677 | |
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678 | int mq_getattr( |
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679 | mqd_t mqdes, |
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680 | struct mq_attr *mqstat |
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681 | ) |
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682 | { |
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683 | register POSIX_Message_queue_Control *the_mq; |
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684 | Objects_Locations location; |
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685 | CORE_message_queue_Attributes *the_mq_attr; |
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686 | |
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687 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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688 | switch ( location ) { |
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689 | case OBJECTS_ERROR: |
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690 | set_errno_and_return_minus_one( EINVAL ); |
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691 | case OBJECTS_REMOTE: |
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692 | _Thread_Dispatch(); |
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693 | return POSIX_MP_NOT_IMPLEMENTED(); |
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694 | set_errno_and_return_minus_one( EINVAL ); |
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695 | case OBJECTS_LOCAL: |
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696 | /* |
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697 | * Return the old values. |
---|
698 | */ |
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699 | |
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700 | /* XXX this is the same stuff as is in mq_setattr... and probably */ |
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701 | /* XXX should be in an inlined private routine */ |
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702 | |
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703 | the_mq_attr = &the_mq->Message_queue.Attributes; |
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704 | |
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705 | mqstat->mq_flags = the_mq->flags; |
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706 | mqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size; |
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707 | mqstat->mq_maxmsg = the_mq->Message_queue.maximum_pending_messages; |
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708 | mqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages; |
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709 | |
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710 | _Thread_Enable_dispatch(); |
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711 | return 0; |
---|
712 | } |
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713 | return POSIX_BOTTOM_REACHED(); |
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714 | } |
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