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/* $OpenBSD: renice.c,v 1.21 2019/01/25 00:19:26 millert Exp $ */
/*
* Copyright (c) 2009, 2015 Todd C. Miller <millert@openbsd.org>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <pwd.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define RENICE_NONE 0
#define RENICE_ABSOLUTE 1
#define RENICE_INCREMENT 2
struct renice_param {
int pri;
short pri_type;
short id_type;
id_t id;
};
int main(int, char **);
static int renice(struct renice_param *, struct renice_param *);
__dead void usage(void);
int
main(int argc, char **argv)
{
struct renice_param *params, *p;
struct passwd *pw;
int ch, id_type = PRIO_PROCESS;
int pri = 0, pri_type = RENICE_NONE;
char *ep, *idstr;
const char *errstr;
if (pledge("stdio getpw proc", NULL) == -1)
err(1, "pledge");
if (argc < 3)
usage();
/* Allocate enough space for the worst case. */
params = p = reallocarray(NULL, argc - 1, sizeof(*params));
if (params == NULL)
err(1, NULL);
/* Backwards compatibility: first arg may be priority. */
if (isdigit((unsigned char)argv[1][0]) ||
((argv[1][0] == '+' || argv[1][0] == '-') &&
isdigit((unsigned char)argv[1][1]))) {
pri = (int)strtol(argv[1], &ep, 10);
if (*ep != '\0' || ep == argv[1]) {
warnx("invalid priority %s", argv[1]);
usage();
}
pri_type = RENICE_ABSOLUTE;
optind = 2;
}
/*
* Slightly tricky getopt() usage since it is legal to have
* option flags interleaved with arguments.
*/
for (;;) {
if ((ch = getopt(argc, argv, "g:n:p:u:")) != -1) {
switch (ch) {
case 'g':
id_type = PRIO_PGRP;
idstr = optarg;
break;
case 'n':
pri = (int)strtol(optarg, &ep, 10);
if (*ep != '\0' || ep == optarg) {
warnx("invalid increment %s", optarg);
usage();
}
/* Set priority for previous entries? */
if (pri_type == RENICE_NONE) {
struct renice_param *pp;
for (pp = params; pp != p; pp++) {
pp->pri = pri;
pp->pri_type = RENICE_INCREMENT;
}
}
pri_type = RENICE_INCREMENT;
continue;
case 'p':
id_type = PRIO_PROCESS;
idstr = optarg;
break;
case 'u':
id_type = PRIO_USER;
idstr = optarg;
break;
default:
usage();
break;
}
} else {
idstr = argv[optind++];
if (idstr == NULL)
break;
}
p->id_type = id_type;
p->pri = pri;
p->pri_type = pri_type;
if (id_type == PRIO_USER) {
if ((pw = getpwnam(idstr)) == NULL) {
uid_t id = strtonum(idstr, 0, UID_MAX, &errstr);
if (!errstr)
pw = getpwuid(id);
}
if (pw == NULL) {
warnx("unknown user %s", idstr);
continue;
}
p->id = pw->pw_uid;
} else {
p->id = strtonum(idstr, 0, UINT_MAX, &errstr);
if (errstr) {
warnx("%s is %s", idstr, errstr);
continue;
}
}
p++;
}
if (pri_type == RENICE_NONE)
usage();
return(renice(params, p));
}
static int
renice(struct renice_param *p, struct renice_param *end)
{
int new, old, errors = 0;
for (; p < end; p++) {
errno = 0;
old = getpriority(p->id_type, p->id);
if (errno) {
warn("getpriority: %d", p->id);
errors++;
continue;
}
if (p->pri_type == RENICE_INCREMENT)
p->pri += old;
new = p->pri > PRIO_MAX ? PRIO_MAX :
p->pri < PRIO_MIN ? PRIO_MIN : p->pri;
if (setpriority(p->id_type, p->id, new) == -1) {
warn("setpriority: %d", p->id);
errors++;
continue;
}
printf("%d: old priority %d, new priority %d\n",
p->id, old, new);
}
return (errors);
}
__dead void
usage(void)
{
fprintf(stderr, "usage: renice [-n] increment [-gpu] id\n");
exit(1);
}
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