1 | /** |
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2 | * @file |
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3 | * |
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4 | * @brief POSIX Message Queue Receive Support |
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5 | * @ingroup POSIX_MQUEUE_P Message Queues Private Support Information |
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6 | */ |
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7 | |
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8 | /* |
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9 | * COPYRIGHT (c) 1989-2011. |
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10 | * On-Line Applications Research Corporation (OAR). |
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11 | * |
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12 | * The license and distribution terms for this file may be |
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13 | * found in the file LICENSE in this distribution or at |
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14 | * http://www.rtems.com/license/LICENSE. |
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15 | */ |
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16 | |
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17 | #if HAVE_CONFIG_H |
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18 | #include "config.h" |
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19 | #endif |
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20 | |
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21 | #include <stdarg.h> |
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22 | |
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23 | #include <pthread.h> |
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24 | #include <limits.h> |
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25 | #include <errno.h> |
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26 | #include <fcntl.h> |
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27 | #include <mqueue.h> |
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28 | |
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29 | #include <rtems/system.h> |
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30 | #include <rtems/score/watchdog.h> |
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31 | #include <rtems/seterr.h> |
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32 | #include <rtems/posix/mqueue.h> |
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33 | #include <rtems/posix/time.h> |
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34 | |
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35 | /* |
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36 | * _POSIX_Message_queue_Receive_support |
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37 | * |
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38 | * NOTE: XXX Document how size, priority, length, and the buffer go |
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39 | * through the layers. |
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40 | */ |
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41 | |
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42 | ssize_t _POSIX_Message_queue_Receive_support( |
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43 | mqd_t mqdes, |
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44 | char *msg_ptr, |
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45 | size_t msg_len, |
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46 | unsigned int *msg_prio, |
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47 | bool wait, |
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48 | Watchdog_Interval timeout |
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49 | ) |
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50 | { |
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51 | POSIX_Message_queue_Control *the_mq; |
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52 | POSIX_Message_queue_Control_fd *the_mq_fd; |
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53 | Objects_Locations location; |
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54 | size_t length_out; |
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55 | bool do_wait; |
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56 | |
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57 | the_mq_fd = _POSIX_Message_queue_Get_fd( mqdes, &location ); |
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58 | switch ( location ) { |
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59 | |
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60 | case OBJECTS_LOCAL: |
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61 | if ( (the_mq_fd->oflag & O_ACCMODE) == O_WRONLY ) { |
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62 | _Thread_Enable_dispatch(); |
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63 | rtems_set_errno_and_return_minus_one( EBADF ); |
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64 | } |
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65 | |
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66 | the_mq = the_mq_fd->Queue; |
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67 | |
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68 | if ( msg_len < the_mq->Message_queue.maximum_message_size ) { |
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69 | _Thread_Enable_dispatch(); |
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70 | rtems_set_errno_and_return_minus_one( EMSGSIZE ); |
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71 | } |
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72 | |
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73 | /* |
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74 | * Now if something goes wrong, we return a "length" of -1 |
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75 | * to indicate an error. |
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76 | */ |
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77 | |
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78 | length_out = -1; |
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79 | |
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80 | /* |
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81 | * A timed receive with a bad time will do a poll regardless. |
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82 | */ |
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83 | if ( wait ) |
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84 | do_wait = (the_mq_fd->oflag & O_NONBLOCK) ? false : true; |
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85 | else |
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86 | do_wait = wait; |
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87 | |
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88 | /* |
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89 | * Now perform the actual message receive |
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90 | */ |
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91 | _CORE_message_queue_Seize( |
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92 | &the_mq->Message_queue, |
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93 | mqdes, |
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94 | msg_ptr, |
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95 | &length_out, |
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96 | do_wait, |
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97 | timeout |
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98 | ); |
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99 | |
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100 | _Thread_Enable_dispatch(); |
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101 | if (msg_prio) { |
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102 | *msg_prio = _POSIX_Message_queue_Priority_from_core( |
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103 | _Thread_Executing->Wait.count |
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104 | ); |
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105 | } |
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106 | |
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107 | if ( !_Thread_Executing->Wait.return_code ) |
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108 | return length_out; |
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109 | |
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110 | rtems_set_errno_and_return_minus_one( |
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111 | _POSIX_Message_queue_Translate_core_message_queue_return_code( |
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112 | _Thread_Executing->Wait.return_code |
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113 | ) |
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114 | ); |
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115 | |
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116 | #if defined(RTEMS_MULTIPROCESSING) |
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117 | case OBJECTS_REMOTE: |
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118 | #endif |
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119 | case OBJECTS_ERROR: |
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120 | break; |
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121 | } |
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122 | |
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123 | rtems_set_errno_and_return_minus_one( EBADF ); |
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124 | } |
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