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 *
sprint_ioprio(int ioprio)54 sprint_ioprio(int ioprio)
55 {
56 static char outstr[256];
57 const char *str;
58 int class, data;
59
60 class = IOPRIO_PRIO_CLASS(ioprio);
61 data = IOPRIO_PRIO_DATA(ioprio);
62 str = xlookup(ioprio_class, class);
63 if (str)
64 sprintf(outstr, "IOPRIO_PRIO_VALUE(%s,%d)", str, data);
65 else
66 sprintf(outstr, "IOPRIO_PRIO_VALUE(%#x /* %s */,%d)",
67 class, "IOPRIO_CLASS_???", data);
68
69 return outstr;
70 }
71
SYS_FUNC(ioprio_get)72 SYS_FUNC(ioprio_get)
73 {
74 if (entering(tcp)) {
75 /* int which */
76 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
77 /* int who */
78 tprintf(", %d", (int) tcp->u_arg[1]);
79 return 0;
80 } else {
81 if (syserror(tcp))
82 return 0;
83
84 tcp->auxstr = sprint_ioprio(tcp->u_rval);
85 return RVAL_STR;
86 }
87 }
88
SYS_FUNC(ioprio_set)89 SYS_FUNC(ioprio_set)
90 {
91 /* int which */
92 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
93 /* int who */
94 tprintf(", %d, ", (int) tcp->u_arg[1]);
95 /* int ioprio */
96 tprints(sprint_ioprio(tcp->u_arg[2]));
97
98 return RVAL_DECODED;
99 }
100