Contents of /tags/mkinitrd-6_3_2/busybox/miscutils/ionice.c
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Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
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File size: 2239 byte(s)
Tue Sep 14 20:33:28 2010 UTC (14 years ago) by niro
File MIME type: text/plain
File size: 2239 byte(s)
tagged 'mkinitrd-6_3_2'
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[0]) { |
93 | BB_EXECVP_or_die(argv); |
94 | } |
95 | } |
96 | |
97 | return EXIT_SUCCESS; |
98 | } |