source: mainline/libc/generic/cap.c@ ce5bcb4

/*
 * Copyright (C) 2006 Jakub Jermar
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */ 

/**
 * @file        cap.c
 * @brief       Functions to grant/revoke capabilities to/from a task.
 */

#include <cap.h>
#include <task.h>
#include <libc.h>
#include <kernel/syscall/sysarg64.h>

/** Grant capabilities to a task.
 *
 * @param id Destination task ID.
 * @param caps Capabilities to grant.
 *
 * @return Zero on success or a value from @ref errno.h on failure.
 */
int cap_grant(task_id_t id, unsigned int caps)
{
        sysarg64_t arg;
        
        arg.value = (unsigned long long) id;

        __SYSCALL2(SYS_CAP_GRANT, (sysarg_t) &arg, (sysarg_t) caps);
}

/** Revoke capabilities from a task.
 *
 * @param id Destination task ID.
 * @param caps Capabilities to revoke.
 *
 * @return Zero on success or a value from @ref errno.h on failure.
 */
int cap_revoke(task_id_t id, unsigned int caps)
{
        sysarg64_t arg;
        
        arg.value = (unsigned long long) id;

        __SYSCALL2(SYS_CAP_REVOKE, (sysarg_t) &arg, (sysarg_t) caps);
}