1 /* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv (at) 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 enum { 33 IOPRIO_WHO_PROCESS = 1, 34 IOPRIO_WHO_PGRP, 35 IOPRIO_WHO_USER 36 }; 37 38 #include "xlat/ioprio_who.h" 39 40 enum { 41 IOPRIO_CLASS_NONE, 42 IOPRIO_CLASS_RT, 43 IOPRIO_CLASS_BE, 44 IOPRIO_CLASS_IDLE 45 }; 46 47 #include "xlat/ioprio_class.h" 48 49 #define IOPRIO_CLASS_SHIFT (13) 50 #define IOPRIO_PRIO_MASK ((1ul << IOPRIO_CLASS_SHIFT) - 1) 51 52 #define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT) 53 #define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK) 54 55 static const char * 56 sprint_ioprio(unsigned int ioprio) 57 { 58 static char outstr[256]; 59 const char *str; 60 unsigned int class, data; 61 62 class = IOPRIO_PRIO_CLASS(ioprio); 63 data = IOPRIO_PRIO_DATA(ioprio); 64 str = xlookup(ioprio_class, class); 65 if (str) 66 xsprintf(outstr, "IOPRIO_PRIO_VALUE(%s, %d)", str, data); 67 else 68 xsprintf(outstr, "IOPRIO_PRIO_VALUE(%#x /* %s */, %d)", 69 class, "IOPRIO_CLASS_???", data); 70 71 return outstr; 72 } 73 74 SYS_FUNC(ioprio_get) 75 { 76 if (entering(tcp)) { 77 /* int which */ 78 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???"); 79 /* int who */ 80 tprintf(", %d", (int) tcp->u_arg[1]); 81 return 0; 82 } else { 83 if (syserror(tcp)) 84 return 0; 85 86 tcp->auxstr = sprint_ioprio(tcp->u_rval); 87 return RVAL_STR; 88 } 89 } 90 91 SYS_FUNC(ioprio_set) 92 { 93 /* int which */ 94 printxval(ioprio_who, tcp->u_arg[0], "IOPRIO_WHO_???"); 95 /* int who */ 96 tprintf(", %d, ", (int) tcp->u_arg[1]); 97 /* int ioprio */ 98 tprints(sprint_ioprio(tcp->u_arg[2])); 99 100 return RVAL_DECODED; 101 } 102