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       1                 :            : /*
       2                 :            :  * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
       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                 :            :  * 1. Redistributions of source code must retain the above copyright
       9                 :            :  *    notice, this list of conditions and the following disclaimer.
      10                 :            :  * 2. Redistributions in binary form must reproduce the above copyright
      11                 :            :  *    notice, this list of conditions and the following disclaimer in the
      12                 :            :  *    documentation and/or other materials provided with the distribution.
      13                 :            :  * 3. The name of the author may not be used to endorse or promote products
      14                 :            :  *    derived from this software without specific prior written permission.
      15                 :            :  *
      16                 :            :  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
      17                 :            :  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
      18                 :            :  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
      19                 :            :  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
      20                 :            :  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
      21                 :            :  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
      22                 :            :  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
      23                 :            :  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
      24                 :            :  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
      25                 :            :  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
      26                 :            :  */
      27                 :            : 
      28                 :            : #include "defs.h"
      29                 :            : 
      30                 :            : enum {
      31                 :            :         IOPRIO_WHO_PROCESS = 1,
      32                 :            :         IOPRIO_WHO_PGRP,
      33                 :            :         IOPRIO_WHO_USER
      34                 :            : };
      35                 :            : 
      36                 :            : #include "xlat/ioprio_who.h"
      37                 :            : 
      38                 :            : enum {
      39                 :            :         IOPRIO_CLASS_NONE,
      40                 :            :         IOPRIO_CLASS_RT,
      41                 :            :         IOPRIO_CLASS_BE,
      42                 :            :         IOPRIO_CLASS_IDLE
      43                 :            : };
      44                 :            : 
      45                 :            : #include "xlat/ioprio_class.h"
      46                 :            : 
      47                 :            : #define IOPRIO_CLASS_SHIFT      (13)
      48                 :            : #define IOPRIO_PRIO_MASK        ((1ul << IOPRIO_CLASS_SHIFT) - 1)
      49                 :            : 
      50                 :            : #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
      51                 :            : #define IOPRIO_PRIO_DATA(mask)  ((mask) & IOPRIO_PRIO_MASK)
      52                 :            : 
      53                 :            : static const char *
      54                 :         18 : sprint_ioprio(unsigned int ioprio)
      55                 :            : {
      56                 :            :         static char outstr[256];
      57                 :            :         const char *str;
      58                 :            :         unsigned int class, data;
      59                 :            : 
      60                 :         18 :         class = IOPRIO_PRIO_CLASS(ioprio);
      61                 :         18 :         data = IOPRIO_PRIO_DATA(ioprio);
      62                 :         18 :         str = xlookup(ioprio_class, class);
      63         [ +  + ]:         18 :         if (str)
      64                 :         12 :                 sprintf(outstr, "IOPRIO_PRIO_VALUE(%s, %d)", str, data);
      65                 :            :         else
      66                 :          6 :                 sprintf(outstr, "IOPRIO_PRIO_VALUE(%#x /* %s */, %d)",
      67                 :            :                         class, "IOPRIO_CLASS_???", data);
      68                 :            : 
      69                 :         18 :         return outstr;
      70                 :            : }
      71                 :            : 
      72                 :         24 : SYS_FUNC(ioprio_get)
      73                 :            : {
      74         [ +  + ]:         24 :         if (entering(tcp)) {
      75                 :            :                 /* int which */
      76                 :         12 :                 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
      77                 :            :                 /* int who */
      78                 :         12 :                 tprintf(", %d", (int) tcp->u_arg[1]);
      79                 :         12 :                 return 0;
      80                 :            :         } else {
      81         [ +  + ]:         12 :                 if (syserror(tcp))
      82                 :          6 :                         return 0;
      83                 :            : 
      84                 :          6 :                 tcp->auxstr = sprint_ioprio(tcp->u_rval);
      85                 :          6 :                 return RVAL_STR;
      86                 :            :         }
      87                 :            : }
      88                 :            : 
      89                 :         12 : SYS_FUNC(ioprio_set)
      90                 :            : {
      91                 :            :         /* int which */
      92                 :         12 :         printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
      93                 :            :         /* int who */
      94                 :         12 :         tprintf(", %d, ", (int) tcp->u_arg[1]);
      95                 :            :         /* int ioprio */
      96                 :         12 :         tprints(sprint_ioprio(tcp->u_arg[2]));
      97                 :            : 
      98                 :         12 :         return RVAL_DECODED;
      99                 :            : }