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  1. /*
  2.  * Copyright (c) 2006 Jakub Jermar
  3.  * All rights reserved.
  4.  *
  5.  * Redistribution and use in source and binary forms, with or without
  6.  * modification, are permitted provided that the following conditions
  7.  * are met:
  8.  *
  9.  * - Redistributions of source code must retain the above copyright
  10.  *   notice, this list of conditions and the following disclaimer.
  11.  * - Redistributions in binary form must reproduce the above copyright
  12.  *   notice, this list of conditions and the following disclaimer in the
  13.  *   documentation and/or other materials provided with the distribution.
  14.  * - The name of the author may not be used to endorse or promote products
  15.  *   derived from this software without specific prior written permission.
  16.  *
  17.  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  18.  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  19.  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  20.  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  21.  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  22.  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  23.  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  24.  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  25.  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  26.  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  27.  */
  28.  
  29. /** @addtogroup libc
  30.  * @{
  31.  */
  32. /**
  33.  * @file    cap.c
  34.  * @brief   Functions to grant/revoke capabilities to/from a task.
  35.  */
  36.  
  37. #include <cap.h>
  38. #include <task.h>
  39. #include <libc.h>
  40. #include <kernel/syscall/sysarg64.h>
  41.  
  42. /** Grant capabilities to a task.
  43.  *
  44.  * @param id Destination task ID.
  45.  * @param caps Capabilities to grant.
  46.  *
  47.  * @return Zero on success or a value from @ref errno.h on failure.
  48.  */
  49. int cap_grant(task_id_t id, unsigned int caps)
  50. {
  51.     sysarg64_t arg;
  52.    
  53.     arg.value = (unsigned long long) id;
  54.  
  55.     return __SYSCALL2(SYS_CAP_GRANT, (sysarg_t) &arg, (sysarg_t) caps);
  56. }
  57.  
  58. /** Revoke capabilities from a task.
  59.  *
  60.  * @param id Destination task ID.
  61.  * @param caps Capabilities to revoke.
  62.  *
  63.  * @return Zero on success or a value from @ref errno.h on failure.
  64.  */
  65. int cap_revoke(task_id_t id, unsigned int caps)
  66. {
  67.     sysarg64_t arg;
  68.    
  69.     arg.value = (unsigned long long) id;
  70.  
  71.     return __SYSCALL2(SYS_CAP_REVOKE, (sysarg_t) &arg, (sysarg_t) caps);
  72. }
  73.  
  74. /** @}
  75.  */
  76.