#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1983, 1989, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif
#if 0
#ifndef lint
static char sccsid[] = "@(#)renice.c 8.1 (Berkeley) 6/9/93";
#endif
#endif
#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);
int
main(int argc, char *argv[])
{
struct passwd *pwd;
int errs, incr, prio, which, who;
int delim;
int priflag;
errs = 0;
incr = 0;
which = PRIO_PROCESS;
who = 0;
argc--, argv++;
if (argc < 2)
usage();
delim = 0;
priflag = 0;
for (; argc > 0; argc--, argv++, priflag++) {
if (0 == delim) {
if (strcmp(*argv, "-n") == 0) {
incr = 1;
argc--, argv++;
if (getnum("priority", *argv, &prio))
return (1);
continue;
}
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 (strcmp(*argv, "--") == 0) {
delim = 1;
continue;
}
if (0 == priflag) {
if (getnum("priority", *argv, &prio)) {
return(1);
}
continue;
}
}
if (which == PRIO_USER) {
if ((pwd = getpwnam(*argv)) != NULL)
who = pwd->pw_uid;
else if (getnum("uid", *argv, &who)) {
errs++;
continue;
} else if (who < 0) {
warnx("%s: bad value", *argv);
errs++;
continue;
}
} else {
if (getnum("pid", *argv, &who)) {
errs++;
continue;
}
if (who < 0) {
warnx("%s: bad value", *argv);
errs++;
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);
}
return (0);
}
static int
getnum(const char *com, const char *str, int *val)
{
long v;
char *ep;
errno = 0;
v = strtol(str, &ep, 10);
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 [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]",
" renice -n increment [[-p] pid ...] [[-g] pgrp ...] [[-u] user ...]");
exit(1);
}