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94 lines
1.5 KiB
C
94 lines
1.5 KiB
C
/* See LICENSE file for copyright and license details. */
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#include <sys/resource.h>
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#include <errno.h>
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#include <pwd.h>
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#include <stdlib.h>
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#include "util.h"
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#ifndef PRIO_MIN
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#define PRIO_MIN -NZERO
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#endif
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#ifndef PRIO_MAX
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#define PRIO_MAX (NZERO-1)
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#endif
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static int
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renice(int which, int who, long adj)
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{
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errno = 0;
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adj += getpriority(which, who);
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if (errno) {
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weprintf("getpriority %d:", who);
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return 0;
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}
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adj = MAX(PRIO_MIN, MIN(adj, PRIO_MAX));
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if (setpriority(which, who, (int)adj) < 0) {
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weprintf("setpriority %d:", who);
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return 0;
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}
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return 1;
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}
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static void
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usage(void)
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{
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eprintf("usage: %s -n num [-g | -p | -u] id ...\n", argv0);
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}
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int
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main(int argc, char *argv[])
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{
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const char *adj = NULL;
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long val;
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int which = PRIO_PROCESS, ret = 0;
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struct passwd *pw;
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int who;
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ARGBEGIN {
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case 'n':
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adj = EARGF(usage());
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break;
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case 'g':
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which = PRIO_PGRP;
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break;
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case 'p':
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which = PRIO_PROCESS;
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break;
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case 'u':
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which = PRIO_USER;
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break;
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default:
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usage();
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} ARGEND
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if (!argc || !adj)
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usage();
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val = estrtonum(adj, PRIO_MIN, PRIO_MAX);
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for (; *argv; argc--, argv++) {
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if (which == PRIO_USER) {
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errno = 0;
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if (!(pw = getpwnam(*argv))) {
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if (errno)
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weprintf("getpwnam %s:", *argv);
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else
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weprintf("getpwnam %s: no user found\n", *argv);
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ret = 1;
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continue;
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}
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who = pw->pw_uid;
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} else {
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who = estrtonum(*argv, 1, INT_MAX);
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}
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if (!renice(which, who, val))
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ret = 1;
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}
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return ret;
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}
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