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 | * COPYRIGHT (c) 1989-2009. |
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15 | * On-Line Applications Research Corporation (OAR). |
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16 | * |
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17 | * The license and distribution terms for this file may be |
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18 | * found in the file LICENSE in this distribution or at |
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19 | * http://www.rtems.org/license/LICENSE. |
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20 | */ |
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21 | |
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22 | #if HAVE_CONFIG_H |
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23 | #include "config.h" |
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24 | #endif |
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25 | |
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26 | #include <string.h> |
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27 | #include <stdarg.h> |
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28 | #include <stdlib.h> |
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29 | |
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30 | #include <pthread.h> |
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31 | #include <limits.h> |
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32 | #include <errno.h> |
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33 | #include <fcntl.h> |
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34 | #include <mqueue.h> |
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35 | |
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36 | #include <rtems/system.h> |
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37 | #include <rtems/score/watchdog.h> |
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38 | #include <rtems/score/wkspace.h> |
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39 | #include <rtems/seterr.h> |
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40 | #include <rtems/posix/mqueueimpl.h> |
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41 | |
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42 | /* |
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43 | * _POSIX_Message_queue_Create_support |
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44 | * |
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45 | * This routine does the actual creation and initialization of |
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46 | * a poxix message queue. |
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47 | */ |
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48 | |
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49 | int _POSIX_Message_queue_Create_support( |
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50 | const char *name_arg, |
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51 | size_t name_len, |
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52 | int pshared, |
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53 | struct mq_attr *attr_ptr, |
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54 | POSIX_Message_queue_Control **message_queue |
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55 | ) |
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56 | { |
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57 | POSIX_Message_queue_Control *the_mq; |
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58 | CORE_message_queue_Attributes *the_mq_attr; |
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59 | struct mq_attr attr; |
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60 | char *name; |
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61 | |
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62 | /* length of name has already been validated */ |
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63 | |
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64 | /* |
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65 | * There is no real basis for the default values. They will work |
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66 | * but were not compared against any existing implementation for |
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67 | * compatibility. See README.mqueue for an example program we |
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68 | * think will print out the defaults. Report anything you find with it. |
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69 | */ |
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70 | if ( attr_ptr == NULL ) { |
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71 | attr.mq_maxmsg = 10; |
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72 | attr.mq_msgsize = 16; |
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73 | } else { |
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74 | if ( attr_ptr->mq_maxmsg <= 0 ){ |
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75 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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76 | } |
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77 | |
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78 | if ( attr_ptr->mq_msgsize <= 0 ){ |
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79 | rtems_set_errno_and_return_minus_one( EINVAL ); |
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80 | } |
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81 | |
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82 | attr = *attr_ptr; |
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83 | } |
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84 | |
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85 | the_mq = _POSIX_Message_queue_Allocate(); |
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86 | if ( !the_mq ) { |
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87 | _Objects_Allocator_unlock(); |
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88 | rtems_set_errno_and_return_minus_one( ENFILE ); |
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89 | } |
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90 | |
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91 | /* |
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92 | * Make a copy of the user's string for name just in case it was |
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93 | * dynamically constructed. |
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94 | */ |
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95 | name = _Workspace_String_duplicate( name_arg, name_len ); |
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96 | if ( !name ) { |
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97 | _POSIX_Message_queue_Free( the_mq ); |
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98 | _Objects_Allocator_unlock(); |
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99 | rtems_set_errno_and_return_minus_one( ENOMEM ); |
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100 | } |
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101 | |
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102 | the_mq->process_shared = pshared; |
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103 | the_mq->named = true; |
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104 | the_mq->open_count = 1; |
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105 | the_mq->linked = true; |
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106 | |
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107 | /* |
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108 | * NOTE: That thread blocking discipline should be based on the |
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109 | * current scheduling policy. |
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110 | * |
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111 | * Joel: Cite POSIX or OpenGroup on above statement so we can determine |
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112 | * if it is a real requirement. |
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113 | */ |
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114 | the_mq_attr = &the_mq->Message_queue.Attributes; |
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115 | the_mq_attr->discipline = CORE_MESSAGE_QUEUE_DISCIPLINES_FIFO; |
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116 | |
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117 | if ( !_CORE_message_queue_Initialize( |
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118 | &the_mq->Message_queue, |
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119 | the_mq_attr, |
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120 | attr.mq_maxmsg, |
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121 | attr.mq_msgsize |
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122 | ) ) { |
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123 | |
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124 | _POSIX_Message_queue_Free( the_mq ); |
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125 | _Workspace_Free(name); |
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126 | _Objects_Allocator_unlock(); |
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127 | rtems_set_errno_and_return_minus_one( ENOSPC ); |
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128 | } |
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129 | |
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130 | _Objects_Open_string( |
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131 | &_POSIX_Message_queue_Information, |
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132 | &the_mq->Object, |
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133 | name |
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134 | ); |
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135 | |
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136 | *message_queue = the_mq; |
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137 | |
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138 | _Objects_Allocator_unlock(); |
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139 | return 0; |
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140 | } |
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