busybox/miscutils/ionice.c
Pascal Bellard 21e8e8da64 libbb: introduce and use BB_EXECVP_or_die()
function                                             old     new   delta
BB_EXECVP_or_die                                       -      47     +47
time_main                                           1042    1043      +1
chrt_main                                            371     364      -7
ionice_main                                          292     282     -10
setsid_main                                           69      56     -13
nohup_main                                           236     223     -13
cttyhack_main                                        266     253     -13
chroot_main                                           94      81     -13
chpst_main                                           746     733     -13
timeout_main                                         297     279     -18
taskset_main                                         541     522     -19
vfork_child                                           67      45     -22
parse                                                975     953     -22
lpd_main                                             770     748     -22
launch_helper                                        192     170     -22
tcpudpsvd_main                                      1810    1782     -28
nice_main                                            190     156     -34
env_main                                             242     206     -36
run_command                                          221     174     -47
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 1/17 up/down: 48/-352)         Total: -304 bytes

Signed-off-by: Pascal Bellard <pascal.bellard@ads-lu.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2010-07-04 00:57:03 +02:00

99 lines
2.2 KiB
C

/* vi: set sw=4 ts=4: */
/*
* ionice implementation for busybox based on linux-utils-ng 2.14
*
* Copyright (C) 2008 by <u173034@informatik.uni-oldenburg.de>
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include <sys/syscall.h>
#include <asm/unistd.h>
#include "libbb.h"
static int ioprio_set(int which, int who, int ioprio)
{
return syscall(SYS_ioprio_set, which, who, ioprio);
}
static int ioprio_get(int which, int who)
{
return syscall(SYS_ioprio_get, which, who);
}
enum {
IOPRIO_WHO_PROCESS = 1,
IOPRIO_WHO_PGRP,
IOPRIO_WHO_USER
};
enum {
IOPRIO_CLASS_NONE,
IOPRIO_CLASS_RT,
IOPRIO_CLASS_BE,
IOPRIO_CLASS_IDLE
};
static const char to_prio[] = "none\0realtime\0best-effort\0idle";
#define IOPRIO_CLASS_SHIFT 13
int ionice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int ionice_main(int argc UNUSED_PARAM, char **argv)
{
/* Defaults */
int ioclass = 0;
int pri = 0;
int pid = 0; /* affect own porcess */
int opt;
enum {
OPT_n = 1,
OPT_c = 2,
OPT_p = 4,
};
/* Numeric params */
opt_complementary = "n+:c+:p+";
/* '+': stop at first non-option */
opt = getopt32(argv, "+n:c:p:", &pri, &ioclass, &pid);
argv += optind;
if (opt & OPT_c) {
if (ioclass > 3)
bb_error_msg_and_die("bad class %d", ioclass);
// Do we need this (compat?)?
// if (ioclass == IOPRIO_CLASS_NONE)
// ioclass = IOPRIO_CLASS_BE;
// if (ioclass == IOPRIO_CLASS_IDLE) {
// //if (opt & OPT_n)
// // bb_error_msg("ignoring priority for idle class");
// pri = 7;
// }
}
if (!(opt & (OPT_n|OPT_c))) {
if (!(opt & OPT_p) && *argv)
pid = xatoi_u(*argv);
pri = ioprio_get(IOPRIO_WHO_PROCESS, pid);
if (pri == -1)
bb_perror_msg_and_die("ioprio_%cet", 'g');
ioclass = (pri >> IOPRIO_CLASS_SHIFT) & 0x3;
pri &= 0xff;
printf((ioclass == IOPRIO_CLASS_IDLE) ? "%s\n" : "%s: prio %d\n",
nth_string(to_prio, ioclass), pri);
} else {
//printf("pri=%d class=%d val=%x\n",
//pri, ioclass, pri | (ioclass << IOPRIO_CLASS_SHIFT));
pri |= (ioclass << IOPRIO_CLASS_SHIFT);
if (ioprio_set(IOPRIO_WHO_PROCESS, pid, pri) == -1)
bb_perror_msg_and_die("ioprio_%cet", 's');
if (argv[0]) {
BB_EXECVP_or_die(argv);
}
}
return EXIT_SUCCESS;
}