1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2014-2017 The strace developers.
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 * 2. 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 * 3. 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 #include "defs.h"
30
31 enum {
32 IOPRIO_WHO_PROCESS = 1,
33 IOPRIO_WHO_PGRP,
34 IOPRIO_WHO_USER
35 };
36
37 #include "xlat/ioprio_who.h"
38
39 enum {
40 IOPRIO_CLASS_NONE,
41 IOPRIO_CLASS_RT,
42 IOPRIO_CLASS_BE,
43 IOPRIO_CLASS_IDLE
44 };
45
46 #include "xlat/ioprio_class.h"
47
48 #define IOPRIO_CLASS_SHIFT (13)
49 #define IOPRIO_PRIO_MASK ((1ul << IOPRIO_CLASS_SHIFT) - 1)
50
51 #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
52 #define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
53
54 static const char *
sprint_ioprio(unsigned int ioprio)55 sprint_ioprio(unsigned int ioprio)
56 {
57 static char outstr[256];
58 const char *str;
59 unsigned int class, data;
60
61 class = IOPRIO_PRIO_CLASS(ioprio);
62 data = IOPRIO_PRIO_DATA(ioprio);
63 str = xlookup(ioprio_class, class);
64 if (str)
65 sprintf(outstr, "IOPRIO_PRIO_VALUE(%s, %d)", str, data);
66 else
67 sprintf(outstr, "IOPRIO_PRIO_VALUE(%#x /* %s */, %d)",
68 class, "IOPRIO_CLASS_???", data);
69
70 return outstr;
71 }
72
SYS_FUNC(ioprio_get)73 SYS_FUNC(ioprio_get)
74 {
75 if (entering(tcp)) {
76 /* int which */
77 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
78 /* int who */
79 tprintf(", %d", (int) tcp->u_arg[1]);
80 return 0;
81 } else {
82 if (syserror(tcp))
83 return 0;
84
85 tcp->auxstr = sprint_ioprio(tcp->u_rval);
86 return RVAL_STR;
87 }
88 }
89
SYS_FUNC(ioprio_set)90 SYS_FUNC(ioprio_set)
91 {
92 /* int which */
93 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
94 /* int who */
95 tprintf(", %d, ", (int) tcp->u_arg[1]);
96 /* int ioprio */
97 tprints(sprint_ioprio(tcp->u_arg[2]));
98
99 return RVAL_DECODED;
100 }
101