1 /*
2 * Copyright (c) 2015 Dmitry V. Levin <ldv@altlinux.org>
3 * Copyright (c) 2014-2018 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 #include "xstring.h"
31
32 #include "xlat/ioprio_who.h"
33 #include "xlat/ioprio_class.h"
34
35 #define IOPRIO_CLASS_SHIFT (13)
36 #define IOPRIO_PRIO_MASK ((1ul << IOPRIO_CLASS_SHIFT) - 1)
37
38 #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
39 #define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
40
41 static const char *
sprint_ioprio(unsigned int ioprio)42 sprint_ioprio(unsigned int ioprio)
43 {
44 static char outstr[256];
45 char class_buf[64];
46 unsigned int class, data;
47
48 class = IOPRIO_PRIO_CLASS(ioprio);
49 data = IOPRIO_PRIO_DATA(ioprio);
50 sprintxval(class_buf, sizeof(class_buf), ioprio_class, class,
51 "IOPRIO_CLASS_???");
52 xsprintf(outstr, "IOPRIO_PRIO_VALUE(%s, %d)", class_buf, data);
53
54 return outstr;
55 }
56
SYS_FUNC(ioprio_get)57 SYS_FUNC(ioprio_get)
58 {
59 if (entering(tcp)) {
60 /* int which */
61 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???");
62 /* int who */
63 tprintf(", %d", (int) tcp->u_arg[1]);
64 return 0;
65 } else {
66 if (syserror(tcp))
67 return 0;
68
69 tcp->auxstr = sprint_ioprio(tcp->u_rval);
70 return RVAL_STR;
71 }
72 }
73
SYS_FUNC(ioprio_set)74 SYS_FUNC(ioprio_set)
75 {
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 /* int ioprio */
81 tprints(sprint_ioprio(tcp->u_arg[2]));
82
83 return RVAL_DECODED;
84 }
85