busybox/miscutils/ionice.c
Denys Vlasenko 237bedd499 getopt32: add new syntax of 'o:+' and 'o:*' for -o NUM and -o LIST
In many cases, this aqllows to drop use of opt_complementary.
Approximately -400 bytes:

function                                             old     new   delta
getopt32                                            1423    1502     +79
opt_string                                            17      18      +1
OPT_STR                                               24      25      +1
uniq_main                                            416     406     -10
timeout_main                                         279     269     -10
sulogin_main                                         270     260     -10
readprofile_main                                    1825    1815     -10
ps_main                                              543     533     -10
pidof_main                                           245     235     -10
pgrep_main                                           611     601     -10
od_main                                             2600    2590     -10
mkfs_minix_main                                     2684    2674     -10
mkfs_ext2_main                                      2603    2593     -10
microcom_main                                        712     702     -10
makemime_main                                        315     305     -10
ionice_main                                          282     272     -10
inetd_main                                          2074    2064     -10
ifplugd_main                                        1144    1134     -10
halt_main                                            353     343     -10
getopt_main                                          636     626     -10
fdisk_main                                          2854    2844     -10
env_main                                             206     196     -10
dmesg_main                                           319     309     -10
conspy_main                                         1214    1204     -10
awk_main                                             981     971     -10
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 3/22 up/down: 81/-220)         Total: -139 bytes
   text	   data	    bss	    dec	    hex	filename
 919373	    906	  14060	 934339	  e41c3	busybox_old
 918969	    906	  14060	 933935	  e402f	busybox_unstripped

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2016-07-06 21:58:02 +02:00

105 lines
2.4 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 source tree.
*/
//usage:#define ionice_trivial_usage
//usage: "[-c 1-3] [-n 0-7] [-p PID] [PROG]"
//usage:#define ionice_full_usage "\n\n"
//usage: "Change I/O priority and class\n"
//usage: "\n -c Class. 1:realtime 2:best-effort 3:idle"
//usage: "\n -n Priority"
#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[] ALIGN1 = "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 */
/* '+': 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_positive(*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;
}