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    Contents of /trunk/mkinitrd-magellan/busybox/miscutils/ionice.c

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    Revision 984 - (show annotations) (download)
    Sun May 30 11:32:42 2010 UTC (13 years, 11 months ago) by niro
    File MIME type: text/plain
    File size: 2277 byte(s) 
    -updated to busybox-1.16.1 and enabled blkid/uuid support in default config
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * ionice implementation for busybox based on linux-utils-ng 2.14
    4 *
    5 * Copyright (C) 2008 by <u173034@informatik.uni-oldenburg.de>
    6 *
    7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
    8 */
    9
    10 #include <sys/syscall.h>
    11 #include <asm/unistd.h>
    12 #include "libbb.h"
    13
    14 static int ioprio_set(int which, int who, int ioprio)
    15 {
    16 return syscall(SYS_ioprio_set, which, who, ioprio);
    17 }
    18
    19 static int ioprio_get(int which, int who)
    20 {
    21 return syscall(SYS_ioprio_get, which, who);
    22 }
    23
    24 enum {
    25 IOPRIO_WHO_PROCESS = 1,
    26 IOPRIO_WHO_PGRP,
    27 IOPRIO_WHO_USER
    28 };
    29
    30 enum {
    31 IOPRIO_CLASS_NONE,
    32 IOPRIO_CLASS_RT,
    33 IOPRIO_CLASS_BE,
    34 IOPRIO_CLASS_IDLE
    35 };
    36
    37 static const char to_prio[] = "none\0realtime\0best-effort\0idle";
    38
    39 #define IOPRIO_CLASS_SHIFT 13
    40
    41 int ionice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
    42 int ionice_main(int argc UNUSED_PARAM, char **argv)
    43 {
    44 /* Defaults */
    45 int ioclass = 0;
    46 int pri = 0;
    47 int pid = 0; /* affect own porcess */
    48 int opt;
    49 enum {
    50 OPT_n = 1,
    51 OPT_c = 2,
    52 OPT_p = 4,
    53 };
    54
    55 /* Numeric params */
    56 opt_complementary = "n+:c+:p+";
    57 /* '+': stop at first non-option */
    58 opt = getopt32(argv, "+n:c:p:", &pri, &ioclass, &pid);
    59 argv += optind;
    60
    61 if (opt & OPT_c) {
    62 if (ioclass > 3)
    63 bb_error_msg_and_die("bad class %d", ioclass);
    64 // Do we need this (compat?)?
    65 // if (ioclass == IOPRIO_CLASS_NONE)
    66 // ioclass = IOPRIO_CLASS_BE;
    67 // if (ioclass == IOPRIO_CLASS_IDLE) {
    68 // //if (opt & OPT_n)
    69 // // bb_error_msg("ignoring priority for idle class");
    70 // pri = 7;
    71 // }
    72 }
    73
    74 if (!(opt & (OPT_n|OPT_c))) {
    75 if (!(opt & OPT_p) && *argv)
    76 pid = xatoi_u(*argv);
    77
    78 pri = ioprio_get(IOPRIO_WHO_PROCESS, pid);
    79 if (pri == -1)
    80 bb_perror_msg_and_die("ioprio_%cet", 'g');
    81
    82 ioclass = (pri >> IOPRIO_CLASS_SHIFT) & 0x3;
    83 pri &= 0xff;
    84 printf((ioclass == IOPRIO_CLASS_IDLE) ? "%s\n" : "%s: prio %d\n",
    85 nth_string(to_prio, ioclass), pri);
    86 } else {
    87 //printf("pri=%d class=%d val=%x\n",
    88 //pri, ioclass, pri | (ioclass << IOPRIO_CLASS_SHIFT));
    89 pri |= (ioclass << IOPRIO_CLASS_SHIFT);
    90 if (ioprio_set(IOPRIO_WHO_PROCESS, pid, pri) == -1)
    91 bb_perror_msg_and_die("ioprio_%cet", 's');
    92 if (*argv) {
    93 BB_EXECVP(*argv, argv);
    94 bb_simple_perror_msg_and_die(*argv);
    95 }
    96 }
    97
    98 return EXIT_SUCCESS;
    99 }