| [1] | 1 | /* |
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| 2 | * sys_sem.c - Acces a POSIX unamed semaphore. |
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| 3 | * |
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| 4 | * Copyright (c) 2008,2009,2010,2011,2012 Ghassan Almaless |
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| 5 | * Copyright (c) 2011,2012 UPMC Sorbonne Universites |
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| 6 | * |
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| 7 | * This file is part of ALMOS-kernel. |
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| 8 | * |
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| 9 | * ALMOS-kernel is free software; you can redistribute it and/or modify it |
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| 10 | * under the terms of the GNU General Public License as published by |
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| 11 | * the Free Software Foundation; version 2.0 of the License. |
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| 12 | * |
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| 13 | * ALMOS-kernel is distributed in the hope that it will be useful, but |
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| 14 | * WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 16 | * General Public License for more details. |
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| 17 | * |
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| 18 | * You should have received a copy of the GNU General Public License |
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| 19 | * along with ALMOS-kernel; if not, write to the Free Software Foundation, |
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| 20 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
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| 21 | */ |
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| 22 | |
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| 23 | #include <hal_types.h> |
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| 24 | #include <hal_uspace. |
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| 25 | #include <remote_sem.h> |
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| 26 | |
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| 27 | ////////////////////////////////// |
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| 28 | int sys_sem( void * vaddr, // semaphore virtual address |
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| 29 | uint32_t operation, // requested operation type |
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| 30 | uint32_t * value ) // pointer on in/out argument |
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| 31 | { |
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| 32 | uint32_t data; |
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| 33 | error_t error; |
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| 34 | |
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| 35 | thread_t * this = CURRENT_THREAD; |
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| 36 | process_t * process = CURRENT_PROCESS; |
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| 37 | |
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| 38 | // check vaddr in user vspace |
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| 39 | error = vmm_check_address( process , vaddr , sizeof(unsigned long) ); |
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| 40 | if( error ) |
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| 41 | { |
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| 42 | this->errno = error; |
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| 43 | return -1; |
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| 44 | } |
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| 45 | |
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| 46 | // check value in user vspace |
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| 47 | error = vmm_check_address( process , value , sizeof(int*) ); |
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| 48 | if( error ) |
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| 49 | { |
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| 50 | this->errno = error; |
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| 51 | return -1; |
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| 52 | } |
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| 53 | |
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| 54 | // execute requested operation |
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| 55 | switch( operation ) |
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| 56 | { |
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| 57 | ////////////// |
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| 58 | case SEM_INIT: |
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| 59 | { |
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| 60 | // get argument |
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| 61 | hal_copy_from_uspace( &data , value , sizeof(uint32_t) ); |
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| 62 | |
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| 63 | // call init function |
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| 64 | error = remote_sem_init( (intptr_t)vaddr , data ); |
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| 65 | |
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| 66 | if ( error ) |
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| 67 | { |
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| 68 | this->errno = error; |
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| 69 | return -1; |
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| 70 | } |
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| 71 | break; |
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| 72 | } |
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| 73 | ////////////////// |
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| 74 | case SEM_GETVALUE: |
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| 75 | { |
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| 76 | // get extended pointer on remote semaphore |
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| 77 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 78 | |
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| 79 | if( sem_xp == XPTR_NULL ) // user error |
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| 80 | { |
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| 81 | this->errno = EINVAL; |
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| 82 | return -1; |
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| 83 | } |
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| 84 | else // success |
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| 85 | { |
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| 86 | // get semaphore current value |
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| 87 | remote_sem_get_value( sem_xp , &data ); |
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| 88 | |
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| 89 | // return value to user |
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| 90 | hal_copy_to_uspace( value , &data , sizeof(uint32_t) ); |
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| 91 | } |
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| 92 | break; |
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| 93 | } |
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| 94 | ////////////// |
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| 95 | case SEM_WAIT: |
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| 96 | { |
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| 97 | // get extended pointer on remote semaphore |
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| 98 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 99 | |
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| 100 | if( sem_xp == XPTR_NULL ) // user error |
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| 101 | { |
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| 102 | this->errno = EINVAL; |
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| 103 | return -1; |
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| 104 | } |
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| 105 | else // success |
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| 106 | { |
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| 107 | // wait semaphore available |
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| 108 | remote_sem_wait( sem_xp ); |
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| 109 | } |
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| 110 | break; |
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| 111 | } |
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| 112 | ////////////// |
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| 113 | case SEM_POST: |
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| 114 | { |
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| 115 | // get extended pointer on remote semaphore |
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| 116 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 117 | |
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| 118 | if( sem_xp == XPTR_NULL ) // user error |
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| 119 | { |
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| 120 | this->errno = EINVAL; |
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| 121 | return -1; |
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| 122 | } |
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| 123 | else // success |
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| 124 | { |
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| 125 | // release semaphore |
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| 126 | remote_sem_post( sem_xp ); |
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| 127 | } |
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| 128 | break; |
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| 129 | } |
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| 130 | ///////////////// |
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| 131 | case SEM_DESTROY: |
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| 132 | { |
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| 133 | // get extended pointer on remote semaphore |
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| 134 | xptr_t sem_xp = remote_sem_from_vaddr( (intptr_t)vaddr ); |
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| 135 | |
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| 136 | if( sem_xp == XPTR_NULL ) // user error |
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| 137 | { |
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| 138 | this->errno = EINVAL; |
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| 139 | return -1; |
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| 140 | } |
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| 141 | else // success |
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| 142 | { |
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| 143 | // destroy semaphore |
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| 144 | remote_sem_destroy( sem_xp ); |
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| 145 | } |
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| 146 | break; |
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| 147 | } |
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| 148 | /////// |
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| 149 | default: // undefined operation |
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| 150 | { |
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| 151 | this->errno = EINVAL; |
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| 152 | return -1; |
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| 153 | } |
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| 154 | } |
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| 155 | |
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| 156 | return 0; |
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| 157 | |
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| 158 | } // end sys_sem() |
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