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/* $OpenBSD: renice.c,v 1.16 2013/11/15 22:20:04 millert Exp $ */
/*
* Copyright (c) 2009 Todd C. Miller <Todd.Miller@courtesan.com>
*
* 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>
struct renice_param {
int pri;
int 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, type = PRIO_PROCESS;
int nflag = 0, pri = 0;
char *ep, *idstr;
const char *errstr;
long l;
if (argc < 3)
usage();
/* Allocate enough space for the worst case. */
params = p = calloc(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] == '-' && isdigit((unsigned char)argv[1][1]))) {
argv[0] = "-n";
argc++;
argv--;
}
/*
* 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':
type = PRIO_PGRP;
idstr = optarg;
break;
case 'n':
l = strtol(optarg, &ep, 10);
if (*ep != '\0' || ep == optarg) {
warnx("invalid increment %s", optarg);
usage();
}
pri = l > PRIO_MAX ? PRIO_MAX :
l < PRIO_MIN ? PRIO_MIN : (int)l;
/* Set priority for previous entries? */
if (!nflag) {
struct renice_param *pp;
for (pp = params; pp != p; pp++) {
pp->pri = pri;
}
}
nflag = 1;
continue;
case 'p':
type = PRIO_PROCESS;
idstr = optarg;
break;
case 'u':
type = PRIO_USER;
idstr = optarg;
break;
default:
usage();
break;
}
} else {
idstr = argv[optind++];
if (idstr == NULL)
break;
}
p->type = type;
p->pri = pri;
if (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 (!nflag)
usage();
exit(renice(params, p));
}
static int
renice(struct renice_param *p, struct renice_param *end)
{
int old, errors = 0;
for (; p < end; p++) {
errno = 0;
old = getpriority(p->type, p->id);
if (errno) {
warn("getpriority: %d", p->id);
errors++;
continue;
}
if (setpriority(p->type, p->id, p->pri) == -1) {
warn("setpriority: %d", p->id);
errors++;
continue;
}
printf("%d: old priority %d, new priority %d\n",
p->id, old, p->pri);
}
return (errors);
}
__dead void
usage(void)
{
fprintf(stderr, "usage: renice -n increment [[-g] pgrp ...] "
"[[-p] pid ...] [[-u] user ...]\n");
exit(1);
}
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