uspace/lib/c/generic/cap.c

   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 <libarch/types.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  */
  50 int cap_grant(task_id_t id, unsigned int caps)
  51 {
  52 #ifdef __32_BITS__
  53         sysarg64_t arg = (sysarg64_t) id;
  54         return __SYSCALL2(SYS_CAP_GRANT, (sysarg_t) &arg, (sysarg_t) caps);
  55 #endif
  56
  57 #ifdef __64_BITS__
  58         return __SYSCALL2(SYS_CAP_GRANT, (sysarg_t) id, (sysarg_t) caps);
  59 #endif
  60 }
  61
  62 /** Revoke capabilities from a task.
  63  *
  64  * @param id   Destination task ID.
  65  * @param caps Capabilities to revoke.
  66  *
  67  * @return Zero on success or a value from @ref errno.h on failure.
  68  *
  69  */
  70 int cap_revoke(task_id_t id, unsigned int caps)
  71 {
  72 #ifdef __32_BITS__
  73         sysarg64_t arg = (sysarg64_t) id;
  74         return __SYSCALL2(SYS_CAP_REVOKE, (sysarg_t) &arg, (sysarg_t) caps);
  75 #endif
  76
  77 #ifdef __64_BITS__
  78         return __SYSCALL2(SYS_CAP_REVOKE, (sysarg_t) id, (sysarg_t) caps);
  79 #endif
  80 }
  81
  82 /** @}
  83  */