freebsd-dev/usr.bin/renice/renice.c
Maxim Konovalov 8143906680 o Fix an arguments number check in -n case.
o Remove duplicated prio check, donice() makes it for us.

Spotted by:	David Schultz <dschultz@uclink.Berkeley.EDU>
MFC after:	1 week
2002-04-10 13:38:09 +00:00

178 lines
4.5 KiB
C

/*
* Copyright (c) 1983, 1989, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93";
#endif
static const char rcsid[] =
"$FreeBSD$";
#endif /* not lint */
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
static int donice(int, int, int, int);
static int getnum(const char *, const char *, int *);
static void usage(void);
/*
* Change the priority (nice) of processes
* or groups of processes which are already
* running.
*/
int
main(int argc, char *argv[])
{
struct passwd *pwd;
int errs, incr, prio, which, who;
errs = 0;
incr = 0;
which = PRIO_PROCESS;
who = 0;
argc--, argv++;
if (argc < 2)
usage();
if (strcmp(*argv, "-n") == 0) {
incr = 1;
argc--, argv++;
if (argc < 2)
usage();
}
if (getnum("priority", *argv, &prio))
return (1);
argc--, argv++;
for (; argc > 0; argc--, argv++) {
if (strcmp(*argv, "-g") == 0) {
which = PRIO_PGRP;
continue;
}
if (strcmp(*argv, "-u") == 0) {
which = PRIO_USER;
continue;
}
if (strcmp(*argv, "-p") == 0) {
which = PRIO_PROCESS;
continue;
}
if (which == PRIO_USER) {
pwd = getpwnam(*argv);
if (pwd == NULL) {
warnx("%s: unknown user", *argv);
continue;
}
who = pwd->pw_uid;
} else {
if (getnum("pid", *argv, &who))
continue;
if (who < 0) {
warnx("%s: bad value", *argv);
continue;
}
}
errs += donice(which, who, prio, incr);
}
exit(errs != 0);
}
static int
donice(int which, int who, int prio, int incr)
{
int oldprio;
errno = 0;
oldprio = getpriority(which, who);
if (oldprio == -1 && errno) {
warn("%d: getpriority", who);
return (1);
}
if (incr)
prio = oldprio + prio;
if (prio > PRIO_MAX)
prio = PRIO_MAX;
if (prio < PRIO_MIN)
prio = PRIO_MIN;
if (setpriority(which, who, prio) < 0) {
warn("%d: setpriority", who);
return (1);
}
printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
return (0);
}
static int
getnum(const char *com, const char *str, int *val)
{
long v;
char *ep;
errno = 0;
v = strtol(str, &ep, NULL);
if (v < INT_MIN || v > INT_MAX || errno == ERANGE) {
warnx("%s argument %s is out of range.", com, str);
return (1);
}
if (ep == str || *ep != '\0' || errno != 0) {
warnx("Bad %s argument: %s.", com, str);
return (1);
}
*val = (int)v;
return (0);
}
static void
usage()
{
fprintf(stderr, "%s\n%s\n",
"usage: renice [priority | [-n incr]] [ [ -p ] pids ] [ [ -g ] pgrps ]",
" [ [ -u ] users ]");
exit(1);
}