mirror of git://git.suckless.org/sbase
113 lines
1.8 KiB
C
113 lines
1.8 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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static int strtop(const char *);
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static int renice(int, int, long);
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static int
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strtop(const char *s)
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{
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char *end;
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long n;
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errno = 0;
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n = strtol(s, &end, 10);
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if (*end != '\0') {
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weprintf("%s: not an integer\n", s);
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return -1;
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}
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if (errno != 0 || n <= 0 || n > INT_MAX) {
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weprintf("%s: invalid value\n", s);
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return -1;
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}
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return (int)n;
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}
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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 != 0) {
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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("renice -n inc [-g | -p | -u] ID ...\n");
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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 i, which = PRIO_PROCESS, status = 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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break;
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} ARGEND;
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if (argc == 0 || !adj)
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usage();
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val = estrtonum(adj, PRIO_MIN, PRIO_MAX);
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for (i = 0; i < argc; i++) {
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who = -1;
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if (which == PRIO_USER) {
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errno = 0;
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pw = getpwnam(argv[i]);
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if (!pw) {
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if (errno != 0)
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weprintf("getpwnam %s:", argv[i]);
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else
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weprintf("getpwnam %s: no user found\n", argv[i]);
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status = 1;
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continue;
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}
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who = pw->pw_uid;
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}
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if (who < 0)
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who = strtop(argv[i]);
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if (who < 0 || !renice(which, who, val))
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status = 1;
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}
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return status;
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}
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