1 /* 2 * Copyright (c) 2015 Dmitry V. Levin <ldv (at) 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 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 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 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
