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| author | Denis Vlasenko <vda.linux@googlemail.com> | 2009-01-31 21:45:57 +0000 |
|---|---|---|
| committer | Denis Vlasenko <vda.linux@googlemail.com> | 2009-01-31 21:45:57 +0000 |
| commit | 4acdb46ff17a3dd966ddccdc149cda5a18d51a48 (patch) | |
| tree | e467e075ec91dd753eb1359d6b350c09ed52d78e /miscutils/ionice.c | |
| parent | 802cab15e5407269cc3bb3a53fe076e86b62307e (diff) | |
| download | busybox-w32-4acdb46ff17a3dd966ddccdc149cda5a18d51a48.tar.gz busybox-w32-4acdb46ff17a3dd966ddccdc149cda5a18d51a48.tar.bz2 busybox-w32-4acdb46ff17a3dd966ddccdc149cda5a18d51a48.zip | |
ionice: new applet, adapted from Linux kernel' example by Walter Harms
text data bss dec hex filename
1050316 924 10952 1062192 103530 busybox_old
1050758 924 10952 1062634 1036ea busybox_unstripped
Diffstat (limited to 'miscutils/ionice.c')
| -rw-r--r-- | miscutils/ionice.c | 99 |
1 files changed, 99 insertions, 0 deletions
diff --git a/miscutils/ionice.c b/miscutils/ionice.c new file mode 100644 index 000000000..88d771c30 --- /dev/null +++ b/miscutils/ionice.c | |||
| @@ -0,0 +1,99 @@ | |||
| 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 | } | ||