1 | /* mqueue.c |
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2 | * |
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3 | * NOTE: The structure of the routines is identical to that of POSIX |
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4 | * Message_queues to leave the option of having unnamed message |
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5 | * queues at a future date. They are currently not part of the |
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6 | * POSIX standard but unnamed message_queues are. This is also |
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7 | * the reason for the apparently unnecessary tracking of |
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8 | * the process_shared attribute. [In addition to the fact that |
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9 | * it would be trivial to add pshared to the mq_attr structure |
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10 | * and have process private message queues.] |
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11 | * |
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12 | * This code ignores the O_RDONLY/O_WRONLY/O_RDWR flag at open |
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13 | * time. |
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14 | * |
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15 | * $Id$ |
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16 | */ |
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17 | |
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18 | #include <stdarg.h> |
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19 | |
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20 | #include <pthread.h> |
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21 | #include <limits.h> |
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22 | #include <errno.h> |
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23 | #include <fcntl.h> |
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24 | |
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25 | #include <mqueue.h> |
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26 | #include <rtems/system.h> |
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27 | #include <rtems/score/watchdog.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 | seterrno( ENFILE ); |
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81 | return -1; |
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82 | } |
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83 | |
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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 | seterrno( ENFILE ); |
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90 | return -1; |
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91 | } |
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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 | _POSIX_Message_queue_MP_Send_extract_proxy ) ) { |
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132 | |
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133 | if ( pshared == PTHREAD_PROCESS_SHARED ) |
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134 | _Objects_MP_Close( &_POSIX_Message_queue_Information, the_mq->Object.id ); |
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135 | |
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136 | _POSIX_Message_queue_Free( the_mq ); |
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137 | _Thread_Enable_dispatch(); |
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138 | seterrno( ENOSPC ); |
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139 | return -1; |
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140 | } |
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141 | |
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142 | |
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143 | /* XXX - need Names to be a string!!! */ |
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144 | _Objects_Open( |
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145 | &_POSIX_Message_queue_Information, |
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146 | &the_mq->Object, |
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147 | (char *) name |
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148 | ); |
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149 | |
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150 | *message_queue = the_mq; |
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151 | |
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152 | if ( pshared == PTHREAD_PROCESS_SHARED ) |
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153 | _POSIX_Message_queue_MP_Send_process_packet( |
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154 | POSIX_MESSAGE_QUEUE_MP_ANNOUNCE_CREATE, |
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155 | the_mq->Object.id, |
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156 | (char *) name, |
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157 | 0 /* Not used */ |
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158 | ); |
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159 | |
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160 | _Thread_Enable_dispatch(); |
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161 | return 0; |
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162 | } |
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163 | |
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164 | /*PAGE |
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165 | * |
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166 | * 15.2.2 Open a Message Queue, P1003.1b-1993, p. 272 |
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167 | */ |
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168 | |
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169 | mqd_t mq_open( |
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170 | const char *name, |
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171 | int oflag, |
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172 | ... |
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173 | /* mode_t mode, */ |
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174 | /* struct mq_attr attr */ |
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175 | ) |
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176 | { |
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177 | va_list arg; |
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178 | mode_t mode; |
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179 | struct mq_attr *attr; |
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180 | int status; |
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181 | Objects_Id the_mq_id; |
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182 | POSIX_Message_queue_Control *the_mq; |
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183 | |
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184 | if ( oflag & O_CREAT ) { |
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185 | va_start(arg, oflag); |
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186 | mode = (mode_t) va_arg( arg, mode_t * ); |
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187 | attr = (struct mq_attr *) va_arg( arg, struct mq_attr ** ); |
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188 | va_end(arg); |
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189 | } |
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190 | |
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191 | status = _POSIX_Message_queue_Name_to_id( name, &the_mq_id ); |
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192 | |
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193 | /* |
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194 | * If the name to id translation worked, then the message queue exists |
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195 | * and we can just return a pointer to the id. Otherwise we may |
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196 | * need to check to see if this is a "message queue does not exist" |
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197 | * or some other miscellaneous error on the name. |
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198 | */ |
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199 | |
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200 | if ( status ) { |
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201 | |
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202 | if ( status == EINVAL ) { /* name -> ID translation failed */ |
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203 | if ( !(oflag & O_CREAT) ) { /* willing to create it? */ |
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204 | seterrno( ENOENT ); |
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205 | return (mqd_t) -1; |
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206 | } |
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207 | /* we are willing to create it */ |
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208 | } |
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209 | seterrno( status ); /* some type of error */ |
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210 | return (mqd_t) -1; |
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211 | |
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212 | } else { /* name -> ID translation succeeded */ |
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213 | |
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214 | if ( (oflag & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL) ) { |
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215 | seterrno( EEXIST ); |
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216 | return (mqd_t) -1; |
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217 | } |
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218 | |
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219 | /* |
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220 | * XXX In this case we need to do an ID->pointer conversion to |
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221 | * check the mode. This is probably a good place for a subroutine. |
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222 | */ |
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223 | |
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224 | the_mq->open_count += 1; |
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225 | |
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226 | return (mqd_t)&the_mq->Object.id; |
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227 | |
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228 | } |
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229 | |
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230 | /* XXX verify this comment... |
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231 | * |
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232 | * At this point, the message queue does not exist and everything has been |
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233 | * checked. We should go ahead and create a message queue. |
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234 | */ |
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235 | |
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236 | status = _POSIX_Message_queue_Create_support( |
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237 | name, |
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238 | TRUE, /* shared across processes */ |
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239 | oflag, |
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240 | attr, |
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241 | &the_mq |
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242 | ); |
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243 | |
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244 | if ( status == -1 ) |
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245 | return (mqd_t) -1; |
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246 | |
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247 | return (mqd_t) &the_mq->Object.id; |
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248 | } |
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249 | |
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250 | /*PAGE |
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251 | * |
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252 | * _POSIX_Message_queue_Delete |
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253 | */ |
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254 | |
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255 | void _POSIX_Message_queue_Delete( |
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256 | POSIX_Message_queue_Control *the_mq |
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257 | ) |
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258 | { |
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259 | if ( !the_mq->linked && !the_mq->open_count ) { |
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260 | _POSIX_Message_queue_Free( the_mq ); |
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261 | |
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262 | if ( the_mq->process_shared == PTHREAD_PROCESS_SHARED ) { |
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263 | |
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264 | _Objects_MP_Close( |
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265 | &_POSIX_Message_queue_Information, |
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266 | the_mq->Object.id |
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267 | ); |
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268 | |
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269 | _POSIX_Message_queue_MP_Send_process_packet( |
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270 | POSIX_MESSAGE_QUEUE_MP_ANNOUNCE_DELETE, |
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271 | the_mq->Object.id, |
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272 | 0, /* Not used */ |
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273 | 0 /* Not used */ |
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274 | ); |
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275 | } |
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276 | |
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277 | } |
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278 | } |
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279 | |
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280 | /*PAGE |
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281 | * |
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282 | * 15.2.2 Close a Message Queue, P1003.1b-1993, p. 275 |
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283 | */ |
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284 | |
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285 | int mq_close( |
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286 | mqd_t mqdes |
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287 | ) |
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288 | { |
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289 | register POSIX_Message_queue_Control *the_mq; |
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290 | Objects_Locations location; |
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291 | |
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292 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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293 | switch ( location ) { |
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294 | case OBJECTS_ERROR: |
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295 | seterrno( EINVAL ); |
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296 | return( -1 ); |
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297 | case OBJECTS_REMOTE: |
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298 | _Thread_Dispatch(); |
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299 | return POSIX_MP_NOT_IMPLEMENTED(); |
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300 | seterrno( EINVAL ); |
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301 | return( -1 ); |
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302 | case OBJECTS_LOCAL: |
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303 | the_mq->open_count -= 1; |
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304 | _POSIX_Message_queue_Delete( the_mq ); |
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305 | _Thread_Enable_dispatch(); |
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306 | return 0; |
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307 | } |
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308 | return POSIX_BOTTOM_REACHED(); |
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309 | } |
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310 | |
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311 | /*PAGE |
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312 | * |
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313 | * 15.2.2 Remove a Message Queue, P1003.1b-1993, p. 276 |
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314 | */ |
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315 | |
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316 | int mq_unlink( |
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317 | const char *name |
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318 | ) |
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319 | { |
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320 | int status; |
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321 | register POSIX_Message_queue_Control *the_mq; |
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322 | Objects_Id the_mq_id; |
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323 | Objects_Locations location; |
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324 | |
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325 | status = _POSIX_Message_queue_Name_to_id( name, &the_mq_id ); |
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326 | |
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327 | if ( !status ) { |
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328 | seterrno( status ); |
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329 | return -1; |
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330 | } |
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331 | |
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332 | the_mq = _POSIX_Message_queue_Get( the_mq_id, &location ); |
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333 | switch ( location ) { |
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334 | case OBJECTS_ERROR: |
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335 | seterrno( EINVAL ); |
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336 | return( -1 ); |
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337 | case OBJECTS_REMOTE: |
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338 | _Thread_Dispatch(); |
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339 | return POSIX_MP_NOT_IMPLEMENTED(); |
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340 | seterrno( EINVAL ); |
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341 | return( -1 ); |
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342 | case OBJECTS_LOCAL: |
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343 | |
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344 | _Objects_MP_Close( |
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345 | &_POSIX_Message_queue_Information, |
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346 | the_mq->Object.id |
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347 | ); |
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348 | |
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349 | the_mq->linked = FALSE; |
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350 | |
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351 | _POSIX_Message_queue_Delete( the_mq ); |
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352 | |
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353 | _Thread_Enable_dispatch(); |
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354 | return 0; |
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355 | } |
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356 | return POSIX_BOTTOM_REACHED(); |
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357 | } |
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358 | |
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359 | /*PAGE |
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360 | * |
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361 | * _POSIX_Message_queue_Send_support |
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362 | */ |
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363 | |
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364 | int _POSIX_Message_queue_Send_support( |
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365 | mqd_t mqdes, |
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366 | const char *msg_ptr, |
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367 | unsigned32 msg_len, |
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368 | Priority_Control msg_prio, |
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369 | Watchdog_Interval timeout |
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370 | ) |
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371 | { |
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372 | register POSIX_Message_queue_Control *the_mq; |
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373 | Objects_Locations location; |
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374 | |
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375 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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376 | switch ( location ) { |
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377 | case OBJECTS_ERROR: |
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378 | seterrno( EINVAL ); |
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379 | return( -1 ); |
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380 | case OBJECTS_REMOTE: |
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381 | _Thread_Dispatch(); |
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382 | return POSIX_MP_NOT_IMPLEMENTED(); |
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383 | seterrno( EINVAL ); |
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384 | return( -1 ); |
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385 | case OBJECTS_LOCAL: |
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386 | /* XXX must add support for timeout and priority */ |
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387 | _CORE_message_queue_Send( |
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388 | &the_mq->Message_queue, |
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389 | (void *) msg_ptr, |
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390 | msg_len, |
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391 | mqdes, |
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392 | NULL /* XXX _POSIX_Message_queue_Core_message_queue_mp_support*/ |
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393 | ); |
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394 | _Thread_Enable_dispatch(); |
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395 | return _Thread_Executing->Wait.return_code; |
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396 | } |
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397 | return POSIX_BOTTOM_REACHED(); |
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398 | } |
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399 | |
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400 | /*PAGE |
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401 | * |
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402 | * 15.2.4 Send a Message to a Message Queue, P1003.1b-1993, p. 277 |
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403 | * |
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404 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedsend(). |
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405 | */ |
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406 | |
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407 | int mq_send( |
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408 | mqd_t mqdes, |
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409 | const char *msg_ptr, |
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410 | size_t msg_len, |
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411 | unsigned int msg_prio |
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412 | ) |
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413 | { |
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414 | return _POSIX_Message_queue_Send_support( |
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415 | mqdes, |
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416 | msg_ptr, |
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417 | msg_len, |
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418 | msg_prio, |
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419 | THREAD_QUEUE_WAIT_FOREVER |
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420 | ); |
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421 | } |
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422 | |
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423 | /*PAGE |
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424 | * |
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425 | * 15.2.4 Send a Message to a Message Queue, P1003.1b-1993, p. 277 |
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426 | * |
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427 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedsend(). |
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428 | */ |
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429 | |
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430 | int mq_timedsend( |
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431 | mqd_t mqdes, |
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432 | const char *msg_ptr, |
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433 | size_t msg_len, |
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434 | unsigned int msg_prio, |
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435 | const struct timespec *timeout |
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436 | ) |
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437 | { |
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438 | return _POSIX_Message_queue_Send_support( |
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439 | mqdes, |
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440 | msg_ptr, |
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441 | msg_len, |
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442 | msg_prio, |
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443 | _POSIX_Time_Spec_to_interval( timeout ) |
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444 | ); |
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445 | } |
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446 | |
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447 | /*PAGE |
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448 | * |
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449 | * _POSIX_Message_queue_Receive_support |
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450 | */ |
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451 | |
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452 | /* XXX be careful ... watch the size going through all the layers ... */ |
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453 | |
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454 | ssize_t _POSIX_Message_queue_Receive_support( |
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455 | mqd_t mqdes, |
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456 | char *msg_ptr, |
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457 | size_t msg_len, |
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458 | unsigned int *msg_prio, |
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459 | Watchdog_Interval timeout |
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460 | ) |
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461 | { |
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462 | register POSIX_Message_queue_Control *the_mq; |
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463 | Objects_Locations location; |
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464 | unsigned32 status = 0; |
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465 | unsigned32 length_out; |
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466 | |
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467 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
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468 | switch ( location ) { |
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469 | case OBJECTS_ERROR: |
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470 | seterrno( EINVAL ); |
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471 | return( -1 ); |
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472 | case OBJECTS_REMOTE: |
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473 | _Thread_Dispatch(); |
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474 | return POSIX_MP_NOT_IMPLEMENTED(); |
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475 | seterrno( EINVAL ); |
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476 | return( -1 ); |
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477 | case OBJECTS_LOCAL: |
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478 | /* XXX need to define the options argument to this */ |
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479 | length_out = msg_len; |
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480 | _CORE_message_queue_Seize( |
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481 | &the_mq->Message_queue, |
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482 | mqdes, |
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483 | msg_ptr, |
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484 | &length_out, |
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485 | /* msg_prio, XXXX */ |
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486 | the_mq->blocking, |
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487 | timeout |
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488 | ); |
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489 | _Thread_Enable_dispatch(); |
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490 | if ( !status ) |
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491 | return length_out; |
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492 | /* XXX --- the return codes gotta be looked at .. fix this */ |
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493 | return _Thread_Executing->Wait.return_code; |
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494 | } |
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495 | return POSIX_BOTTOM_REACHED(); |
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496 | } |
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497 | |
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498 | /*PAGE |
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499 | * |
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500 | * 15.2.5 Receive a Message From a Message Queue, P1003.1b-1993, p. 279 |
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501 | * |
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502 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedreceive(). |
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503 | */ |
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504 | |
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505 | ssize_t mq_receive( |
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506 | mqd_t mqdes, |
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507 | char *msg_ptr, |
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508 | size_t msg_len, |
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509 | unsigned int *msg_prio |
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510 | ) |
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511 | { |
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512 | return _POSIX_Message_queue_Receive_support( |
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513 | mqdes, |
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514 | msg_ptr, |
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515 | msg_len, |
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516 | msg_prio, |
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517 | THREAD_QUEUE_WAIT_FOREVER |
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518 | ); |
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519 | } |
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520 | |
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521 | /*PAGE |
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522 | * |
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523 | * 15.2.5 Receive a Message From a Message Queue, P1003.1b-1993, p. 279 |
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524 | * |
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525 | * NOTE: P1003.4b/D8, p. 45 adds mq_timedreceive(). |
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526 | */ |
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527 | |
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528 | int mq_timedreceive( /* XXX: should this be ssize_t */ |
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529 | mqd_t mqdes, |
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530 | char *msg_ptr, |
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531 | size_t msg_len, |
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532 | unsigned int *msg_prio, |
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533 | const struct timespec *timeout |
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534 | ) |
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535 | { |
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536 | return _POSIX_Message_queue_Receive_support( |
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537 | mqdes, |
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538 | msg_ptr, |
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539 | msg_len, |
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540 | msg_prio, |
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541 | _POSIX_Time_Spec_to_interval( timeout ) |
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542 | ); |
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543 | } |
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544 | |
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545 | /*PAGE |
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546 | * |
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547 | * _POSIX_Message_queue_Notify_handler |
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548 | * |
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549 | */ |
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550 | |
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551 | void _POSIX_Message_queue_Notify_handler( |
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552 | void *user_data |
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553 | ) |
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554 | { |
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555 | POSIX_Message_queue_Control *the_mq; |
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556 | |
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557 | the_mq = user_data; |
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558 | |
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559 | /* XXX do something with signals here!!!! */ |
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560 | } |
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561 | |
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562 | /*PAGE |
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563 | * |
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564 | * 15.2.6 Notify Process that a Message is Available on a Queue, |
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565 | * P1003.1b-1993, p. 280 |
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566 | */ |
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567 | |
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568 | int mq_notify( |
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569 | mqd_t mqdes, |
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570 | const struct sigevent *notification |
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571 | ) |
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572 | { |
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573 | register POSIX_Message_queue_Control *the_mq; |
---|
574 | Objects_Locations location; |
---|
575 | |
---|
576 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
---|
577 | switch ( location ) { |
---|
578 | case OBJECTS_ERROR: |
---|
579 | seterrno( EBADF ); |
---|
580 | return( -1 ); |
---|
581 | case OBJECTS_REMOTE: |
---|
582 | _Thread_Dispatch(); |
---|
583 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
584 | seterrno( EINVAL ); |
---|
585 | return( -1 ); |
---|
586 | case OBJECTS_LOCAL: |
---|
587 | if ( notification ) { |
---|
588 | if ( _CORE_message_queue_Is_notify_enabled( &the_mq->Message_queue ) ) { |
---|
589 | _Thread_Enable_dispatch(); |
---|
590 | seterrno( EBUSY ); |
---|
591 | return( -1 ); |
---|
592 | } |
---|
593 | |
---|
594 | _CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL ); |
---|
595 | |
---|
596 | the_mq->notification = *notification; |
---|
597 | |
---|
598 | _CORE_message_queue_Set_notify( |
---|
599 | &the_mq->Message_queue, |
---|
600 | _POSIX_Message_queue_Notify_handler, |
---|
601 | the_mq |
---|
602 | ); |
---|
603 | } else { |
---|
604 | |
---|
605 | _CORE_message_queue_Set_notify( &the_mq->Message_queue, NULL, NULL ); |
---|
606 | |
---|
607 | } |
---|
608 | |
---|
609 | _Thread_Enable_dispatch(); |
---|
610 | return 0; |
---|
611 | } |
---|
612 | return POSIX_BOTTOM_REACHED(); |
---|
613 | } |
---|
614 | |
---|
615 | /*PAGE |
---|
616 | * |
---|
617 | * 15.2.7 Set Message Queue Attributes, P1003.1b-1993, p. 281 |
---|
618 | */ |
---|
619 | |
---|
620 | int mq_setattr( |
---|
621 | mqd_t mqdes, |
---|
622 | const struct mq_attr *mqstat, |
---|
623 | struct mq_attr *omqstat |
---|
624 | ) |
---|
625 | { |
---|
626 | register POSIX_Message_queue_Control *the_mq; |
---|
627 | Objects_Locations location; |
---|
628 | CORE_message_queue_Attributes *the_mq_attr; |
---|
629 | |
---|
630 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
---|
631 | switch ( location ) { |
---|
632 | case OBJECTS_ERROR: |
---|
633 | seterrno( EINVAL ); |
---|
634 | return( -1 ); |
---|
635 | case OBJECTS_REMOTE: |
---|
636 | _Thread_Dispatch(); |
---|
637 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
638 | seterrno( EINVAL ); |
---|
639 | return( -1 ); |
---|
640 | case OBJECTS_LOCAL: |
---|
641 | /* |
---|
642 | * Return the old values. |
---|
643 | */ |
---|
644 | |
---|
645 | /* XXX this is the same stuff as is in mq_getattr... and probably */ |
---|
646 | /* XXX should be in an inlined private routine */ |
---|
647 | |
---|
648 | the_mq_attr = &the_mq->Message_queue.Attributes; |
---|
649 | |
---|
650 | omqstat->mq_flags = the_mq->flags; |
---|
651 | omqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size; |
---|
652 | omqstat->mq_maxmsg = the_mq->Message_queue.maximum_pending_messages; |
---|
653 | omqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages; |
---|
654 | |
---|
655 | /* |
---|
656 | * Ignore everything except the O_NONBLOCK bit. |
---|
657 | */ |
---|
658 | |
---|
659 | if ( mqstat->mq_flags & O_NONBLOCK ) |
---|
660 | the_mq->blocking = FALSE; |
---|
661 | else |
---|
662 | the_mq->blocking = TRUE; |
---|
663 | |
---|
664 | the_mq->flags = mqstat->mq_flags; |
---|
665 | |
---|
666 | _Thread_Enable_dispatch(); |
---|
667 | return 0; |
---|
668 | } |
---|
669 | return POSIX_BOTTOM_REACHED(); |
---|
670 | } |
---|
671 | |
---|
672 | /*PAGE |
---|
673 | * |
---|
674 | * 15.2.8 Get Message Queue Attributes, P1003.1b-1993, p. 283 |
---|
675 | */ |
---|
676 | |
---|
677 | int mq_getattr( |
---|
678 | mqd_t mqdes, |
---|
679 | struct mq_attr *mqstat |
---|
680 | ) |
---|
681 | { |
---|
682 | register POSIX_Message_queue_Control *the_mq; |
---|
683 | Objects_Locations location; |
---|
684 | CORE_message_queue_Attributes *the_mq_attr; |
---|
685 | |
---|
686 | the_mq = _POSIX_Message_queue_Get( mqdes, &location ); |
---|
687 | switch ( location ) { |
---|
688 | case OBJECTS_ERROR: |
---|
689 | seterrno( EINVAL ); |
---|
690 | return( -1 ); |
---|
691 | case OBJECTS_REMOTE: |
---|
692 | _Thread_Dispatch(); |
---|
693 | return POSIX_MP_NOT_IMPLEMENTED(); |
---|
694 | seterrno( EINVAL ); |
---|
695 | return( -1 ); |
---|
696 | case OBJECTS_LOCAL: |
---|
697 | /* |
---|
698 | * Return the old values. |
---|
699 | */ |
---|
700 | |
---|
701 | /* XXX this is the same stuff as is in mq_setattr... and probably */ |
---|
702 | /* XXX should be in an inlined private routine */ |
---|
703 | |
---|
704 | the_mq_attr = &the_mq->Message_queue.Attributes; |
---|
705 | |
---|
706 | mqstat->mq_flags = the_mq->flags; |
---|
707 | mqstat->mq_msgsize = the_mq->Message_queue.maximum_message_size; |
---|
708 | mqstat->mq_maxmsg = the_mq->Message_queue.maximum_pending_messages; |
---|
709 | mqstat->mq_curmsgs = the_mq->Message_queue.number_of_pending_messages; |
---|
710 | |
---|
711 | _Thread_Enable_dispatch(); |
---|
712 | return 0; |
---|
713 | } |
---|
714 | return POSIX_BOTTOM_REACHED(); |
---|
715 | } |
---|