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Add 'nice' and replace 'renice' with a new implementation.

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This commit is contained in:
Manuel Novoa III 2005-02-13 20:14:05 +00:00
parent d2fe81706c
commit 2c511609c4
7 changed files with 233 additions and 28 deletions
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3
AUTHORS
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@ -88,7 +88,8 @@ Glenn McGrath <bug1@iinet.net.au>
Manuel Novoa III <mjn3@codepoet.org>
cat, head, mkfifo, mknod, rmdir, sleep, tee, tty, uniq, usleep, wc, yes,
mesg, vconfig, make_directory, parse_mode, dirname, mode_string,
mesg, vconfig, nice, renice,
make_directory, parse_mode, dirname, mode_string,
get_last_path_component, simplify_path, and a number trivial libbb routines
also bug fixes, partial rewrites, and size optimizations in

6
coreutils/Config.in
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@ -329,6 +329,12 @@ config CONFIG_MV
help
mv is used to move or rename files or directories.
config CONFIG_NICE
bool "nice"
default n
help
nice runs a program with modified scheduling priority.
config CONFIG_OD
bool "od"
default n

1
coreutils/Makefile.in
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@ -58,6 +58,7 @@ COREUTILS-$(CONFIG_MKDIR) += mkdir.o
COREUTILS-$(CONFIG_MKFIFO) += mkfifo.o
COREUTILS-$(CONFIG_MKNOD) += mknod.o
COREUTILS-$(CONFIG_MV) += mv.o
COREUTILS-$(CONFIG_NICE) += nice.o
COREUTILS-$(CONFIG_OD) += od.o
COREUTILS-$(CONFIG_PRINTF) += printf.o
COREUTILS-$(CONFIG_PWD) += pwd.o

86
coreutils/nice.c Normal file
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@ -0,0 +1,86 @@
/* vi: set sw=4 ts=4: */
/*
* nice implementation for busybox
*
* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "busybox.h"
static inline int int_add_no_wrap(int a, int b)
{
int s = a + b;
if (b < 0) {
if (s > a) s = INT_MIN;
} else {
if (s < a) s = INT_MAX;
}
return s;
}
int nice_main(int argc, char **argv)
{
static const char Xetpriority_msg[] = "cannot %cet priority";
int old_priority, adjustment;
errno = 0; /* Needed for getpriority error detection. */
old_priority = getpriority(PRIO_PROCESS, 0);
if (errno) {
bb_perror_msg_and_die(Xetpriority_msg, 'g');
}
if (!*++argv) { /* No args, so (GNU) output current nice value. */
bb_printf("%d\n", old_priority);
bb_fflush_stdout_and_exit(EXIT_SUCCESS);
}
adjustment = 10; /* Set default adjustment. */
if ((argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) { /* "-n" */
if (argc < 4) { /* Missing priority and/or utility! */
bb_show_usage();
}
adjustment = bb_xgetlarg(argv[1], 10, INT_MIN, INT_MAX);
argv += 2;
}
{ /* Set our priority. Handle integer wrapping for old + adjust. */
int new_priority = int_add_no_wrap(old_priority, adjustment);
if (setpriority(PRIO_PROCESS, 0, new_priority) < 0) {
bb_perror_msg_and_die(Xetpriority_msg, 's');
}
}
execvp(*argv, argv); /* Now exec the desired program. */
/* The exec failed... */
bb_default_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */
bb_perror_msg_and_die("%s", *argv);
}

3
include/applets.h
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@ -412,6 +412,9 @@
#ifdef CONFIG_NETSTAT
APPLET(netstat, netstat_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_NICE
APPLET(nice, nice_main, _BB_DIR_BIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_NSLOOKUP
APPLET(nslookup, nslookup_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
#endif

18
include/usage.h
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@ -1813,6 +1813,13 @@
"\t-w raw sockets\n" \
"\t-x unix sockets"
#define nice_trivial_usage \
"[-n ADJUST] [COMMAND [ARG] ...]"
#define nice_full_usage \
"Nice runs a program with modified scheduling priority.\n\n" \
"Options:\n" \
"\t-n ADJUST\tAdjust the scheduling priority by ADJUST.\n" \
#define nslookup_trivial_usage \
"[HOST] [SERVER]"
#define nslookup_full_usage \
@ -2011,11 +2018,14 @@
"\t-d\t\tdelay interval for rebooting."
#define renice_trivial_usage \
"priority pid [pid ...]"
"{{-n INCREMENT} | PRIORITY} [[ -p | -g | -u ] ID ...]"
#define renice_full_usage \
"Changes priority of running processes. Allowed priorities range\n" \
"from 20 (the process runs only when nothing else is running) to 0\n" \
"(default priority) to -20 (almost nothing else ever gets to run)."
"Changes priority of running processes.\n\n" \
"Options:\n" \
"\t-n\tadjusts current nice value (smaller is faster)\n" \
"\t-p\tprocess id(s) (default)\n" \
"\t-g\tprocess group id(s)\n" \
"\t-u\tprocess user name(s) and/or id(s)"
#define reset_trivial_usage \
""

132
procps/renice.c
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@ -1,8 +1,8 @@
/* vi: set sw=4 ts=4: */
/*
* Mini renice implementation for busybox
* renice implementation for busybox
*
*
* Copyright (C) 2000 Dave 'Kill a Cop' Cinege <dcinege@psychosis.com>
* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
@ -20,35 +20,133 @@
*
*/
/* Notes:
* Setting an absolute priority was obsoleted in SUSv2 and removed
* in SUSv3. However, the common linux version of renice does
* absolute and not relative. So we'll continue supporting absolute,
* although the stdout logging has been removed since both SUSv2 and
* SUSv3 specify that stdout isn't used.
*
* This version is lenient in that it doesn't require any IDs. The
* options -p, -g, and -u are treated as mode switches for the
* following IDs (if any). Multiple switches are allowed.
*/
#include <stdio.h>
#include <errno.h>
#include <stdlib.h>
#include <string.h>
#include <limits.h>
#include <errno.h>
#include <unistd.h>
#include <sys/time.h>
#include <sys/resource.h>
#include "busybox.h"
#if (PRIO_PROCESS < CHAR_MIN) || (PRIO_PROCESS > CHAR_MAX)
#error Assumption violated : PRIO_PROCESS value
#endif
#if (PRIO_PGRP < CHAR_MIN) || (PRIO_PGRP > CHAR_MAX)
#error Assumption violated : PRIO_PGRP value
#endif
#if (PRIO_USER < CHAR_MIN) || (PRIO_USER > CHAR_MAX)
#error Assumption violated : PRIO_USER value
#endif
extern int renice_main(int argc, char **argv)
static inline int int_add_no_wrap(int a, int b)
{
int prio, status = EXIT_SUCCESS;
int s = a + b;
if (argc < 3) bb_show_usage();
if (b < 0) {
if (s > a) s = INT_MIN;
} else {
if (s < a) s = INT_MAX;
}
prio = atoi(*++argv);
if (prio > 20) prio = 20;
if (prio < -20) prio = -20;
return s;
}
int renice_main(int argc, char **argv)
{
static const char Xetpriority_msg[] = "%d : %cetpriority";
int retval = EXIT_SUCCESS;
int which = PRIO_PROCESS; /* Default 'which' value. */
int use_relative = 0;
int adjustment, new_priority;
id_t who;
++argv;
/* Check if we are using a relative adjustment. */
if (argv[0] && (argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) {
use_relative = 1;
++argv;
}
if (!*argv) { /* No args? Then show usage. */
bb_show_usage();
}
/* Get the priority adjustment (absolute or relative). */
adjustment = bb_xgetlarg(*argv, 10, INT_MIN, INT_MAX);
while (*++argv) {
int ps = atoi(*argv);
int oldp = getpriority(PRIO_PROCESS, ps);
/* Check for a mode switch. */
if ((argv[0][0] == '-') && argv[0][1] && !argv[0][2]) {
static const char opts[]
= { 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER };
const char *p;
if ((p = strchr(opts, argv[0][1]))) {
which = p[4];
continue;
}
}
if (setpriority(PRIO_PROCESS, ps, prio) == 0) {
printf("%d: old priority %d, new priority %d\n", ps, oldp, prio );
/* Process an ID arg. */
if (which == PRIO_USER) {
struct passwd *p;
if (!(p = getpwnam(*argv))) {
bb_error_msg("unknown user: %s", *argv);
goto HAD_ERROR;
}
who = p->pw_uid;
} else {
bb_perror_msg("%d: setpriority", ps);
status = EXIT_FAILURE;
char *e;
errno = 0;
who = strtoul(*argv, &e, 10);
if (*e || (*argv == e) || errno) {
bb_error_msg("bad value: %s", *argv);
goto HAD_ERROR;
}
}
return status;
/* Get priority to use, and set it. */
if (use_relative) {
int old_priority;
errno = 0; /* Needed for getpriority error detection. */
old_priority = getpriority(which, who);
if (errno) {
bb_perror_msg(Xetpriority_msg, who, 'g');
goto HAD_ERROR;
}
new_priority = int_add_no_wrap(old_priority, adjustment);
} else {
new_priority = adjustment;
}
if (setpriority(which, who, new_priority) == 0) {
continue;
}
bb_perror_msg(Xetpriority_msg, who, 's');
HAD_ERROR:
retval = EXIT_FAILURE;
}
/* No need to check for errors outputing to stderr since, if it
* was used, the HAD_ERROR label was reached and retval was set. */
return retval;
}