1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270
|
/*
* ionice: set or get process io scheduling class and priority
*
* Copyright (C) 2005 Jens Axboe <jens@axboe.dk>
*
* Released under the terms of the GNU General Public License version 2
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <getopt.h>
#include <unistd.h>
#ifdef HAVE_SYS_SYSCALL_H
#include <sys/syscall.h>
#endif
#include <ctype.h>
#include "nls.h"
#include "strutils.h"
#include "c.h"
#include "cctype.h"
#include "closestream.h"
static int tolerant;
static inline int ioprio_set(int which, int who, int ioprio)
{
return syscall(SYS_ioprio_set, which, who, ioprio);
}
static inline int ioprio_get(int which, int who)
{
return syscall(SYS_ioprio_get, which, who);
}
enum {
IOPRIO_CLASS_NONE,
IOPRIO_CLASS_RT,
IOPRIO_CLASS_BE,
IOPRIO_CLASS_IDLE,
};
enum {
IOPRIO_WHO_PROCESS = 1,
IOPRIO_WHO_PGRP,
IOPRIO_WHO_USER,
};
#define IOPRIO_CLASS_SHIFT (13)
#define IOPRIO_PRIO_MASK ((1UL << IOPRIO_CLASS_SHIFT) - 1)
#define IOPRIO_PRIO_CLASS(mask) ((mask) >> IOPRIO_CLASS_SHIFT)
#define IOPRIO_PRIO_DATA(mask) ((mask) & IOPRIO_PRIO_MASK)
#define IOPRIO_PRIO_VALUE(class, data) (((class) << IOPRIO_CLASS_SHIFT) | data)
static const char *const to_prio[] = {
[IOPRIO_CLASS_NONE] = "none",
[IOPRIO_CLASS_RT] = "realtime",
[IOPRIO_CLASS_BE] = "best-effort",
[IOPRIO_CLASS_IDLE] = "idle"
};
static int parse_ioclass(const char *str)
{
size_t i;
for (i = 0; i < ARRAY_SIZE(to_prio); i++)
if (!c_strcasecmp(str, to_prio[i]))
return i;
return -1;
}
static void ioprio_print(int pid, int who)
{
int ioprio = ioprio_get(who, pid);
if (ioprio == -1)
err(EXIT_FAILURE, _("ioprio_get failed"));
else {
int ioclass = IOPRIO_PRIO_CLASS(ioprio);
const char *name = _("unknown");
if (ioclass >= 0 && (size_t) ioclass < ARRAY_SIZE(to_prio))
name = to_prio[ioclass];
if (ioclass != IOPRIO_CLASS_IDLE)
printf(_("%s: prio %lu\n"), name,
IOPRIO_PRIO_DATA(ioprio));
else
printf("%s\n", name);
}
}
static void ioprio_setid(int which, int ioclass, int data, int who)
{
int rc = ioprio_set(who, which,
IOPRIO_PRIO_VALUE(ioclass, data));
if (rc == -1 && !tolerant)
err(EXIT_FAILURE, _("ioprio_set failed"));
}
static void __attribute__((__noreturn__)) usage(void)
{
FILE *out = stdout;
fputs(USAGE_HEADER, out);
fprintf(out, _(" %1$s [options] -p <pid>...\n"
" %1$s [options] -P <pgid>...\n"
" %1$s [options] -u <uid>...\n"
" %1$s [options] <command>\n"), program_invocation_short_name);
fputs(USAGE_SEPARATOR, out);
fputs(_("Show or change the I/O-scheduling class and priority of a process.\n"), out);
fputs(USAGE_OPTIONS, out);
fputs(_(" -c, --class <class> name or number of scheduling class,\n"
" 0: none, 1: realtime, 2: best-effort, 3: idle\n"), out);
fputs(_(" -n, --classdata <num> priority (0..7) in the specified scheduling class,\n"
" only for the realtime and best-effort classes\n"), out);
fputs(_(" -p, --pid <pid>... act on these already running processes\n"), out);
fputs(_(" -P, --pgid <pgrp>... act on already running processes in these groups\n"), out);
fputs(_(" -t, --ignore ignore failures\n"), out);
fputs(_(" -u, --uid <uid>... act on already running processes owned by these users\n"), out);
fputs(USAGE_SEPARATOR, out);
fprintf(out, USAGE_HELP_OPTIONS(24));
fprintf(out, USAGE_MAN_TAIL("ionice(1)"));
exit(EXIT_SUCCESS);
}
int main(int argc, char **argv)
{
int data = 4, set = 0, ioclass = IOPRIO_CLASS_BE, c;
int which = 0, who = 0;
const char *invalid_msg = NULL;
static const struct option longopts[] = {
{ "classdata", required_argument, NULL, 'n' },
{ "class", required_argument, NULL, 'c' },
{ "help", no_argument, NULL, 'h' },
{ "ignore", no_argument, NULL, 't' },
{ "pid", required_argument, NULL, 'p' },
{ "pgid", required_argument, NULL, 'P' },
{ "uid", required_argument, NULL, 'u' },
{ "version", no_argument, NULL, 'V' },
{ NULL, 0, NULL, 0 }
};
setlocale(LC_ALL, "");
bindtextdomain(PACKAGE, LOCALEDIR);
textdomain(PACKAGE);
close_stdout_atexit();
while ((c = getopt_long(argc, argv, "+n:c:p:P:u:tVh", longopts, NULL)) != EOF)
switch (c) {
case 'n':
data = strtos32_or_err(optarg, _("invalid class data argument"));
set |= 1;
break;
case 'c':
if (isdigit(*optarg))
ioclass = strtos32_or_err(optarg,
_("invalid class argument"));
else {
ioclass = parse_ioclass(optarg);
if (ioclass < 0)
errx(EXIT_FAILURE,
_("unknown scheduling class: '%s'"),
optarg);
}
set |= 2;
break;
case 'p':
if (who)
errx(EXIT_FAILURE,
_("can handle only one of pid, pgid or uid at once"));
invalid_msg = _("invalid PID argument");
which = strtos32_or_err(optarg, invalid_msg);
who = IOPRIO_WHO_PROCESS;
break;
case 'P':
if (who)
errx(EXIT_FAILURE,
_("can handle only one of pid, pgid or uid at once"));
invalid_msg = _("invalid PGID argument");
which = strtos32_or_err(optarg, invalid_msg);
who = IOPRIO_WHO_PGRP;
break;
case 'u':
if (who)
errx(EXIT_FAILURE,
_("can handle only one of pid, pgid or uid at once"));
invalid_msg = _("invalid UID argument");
which = strtos32_or_err(optarg, invalid_msg);
who = IOPRIO_WHO_USER;
break;
case 't':
tolerant = 1;
break;
case 'V':
print_version(EXIT_SUCCESS);
case 'h':
usage();
default:
errtryhelp(EXIT_FAILURE);
}
switch (ioclass) {
case IOPRIO_CLASS_NONE:
if ((set & 1) && !tolerant)
warnx(_("ignoring given class data for none class"));
data = 0;
break;
case IOPRIO_CLASS_RT:
case IOPRIO_CLASS_BE:
break;
case IOPRIO_CLASS_IDLE:
if ((set & 1) && !tolerant)
warnx(_("ignoring given class data for idle class"));
data = 7;
break;
default:
if (!tolerant)
warnx(_("unknown prio class %d"), ioclass);
break;
}
if (!set && !which && optind == argc)
/*
* ionice without options, print the current ioprio
*/
ioprio_print(0, IOPRIO_WHO_PROCESS);
else if (!set && who) {
/*
* ionice -p|-P|-u ID [ID ...]
*/
ioprio_print(which, who);
for(; argv[optind]; ++optind) {
which = strtos32_or_err(argv[optind], invalid_msg);
ioprio_print(which, who);
}
} else if (set && who) {
/*
* ionice -c CLASS -p|-P|-u ID [ID ...]
*/
ioprio_setid(which, ioclass, data, who);
for(; argv[optind]; ++optind) {
which = strtos32_or_err(argv[optind], invalid_msg);
ioprio_setid(which, ioclass, data, who);
}
} else if (argv[optind]) {
/*
* ionice [-c CLASS] COMMAND
*/
ioprio_setid(0, ioclass, data, IOPRIO_WHO_PROCESS);
execvp(argv[optind], &argv[optind]);
errexec(argv[optind]);
} else {
warnx(_("bad usage"));
errtryhelp(EXIT_FAILURE);
}
return EXIT_SUCCESS;
}
|