1 /* vi: set sw=4 ts=4: */
3 * nice implementation for busybox
5 * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
10 #include <sys/resource.h>
13 int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
14 int nice_main(int argc, char **argv)
16 int old_priority, adjustment;
18 old_priority = getpriority(PRIO_PROCESS, 0);
20 if (!*++argv) { /* No args, so (GNU) output current nice value. */
21 printf("%d\n", old_priority);
22 fflush_stdout_and_exit(EXIT_SUCCESS);
25 adjustment = 10; /* Set default adjustment. */
27 if (argv[0][0] == '-') {
28 if (argv[0][1] == 'n') { /* -n */
29 if (argv[0][2]) { /* -nNNNN (w/o space) */
30 argv[0] += 2; argv--; argc++;
32 } else { /* -NNN (NNN may be negative) == -n NNN */
33 argv[0] += 1; argv--; argc++;
35 if (argc < 4) { /* Missing priority and/or utility! */
38 adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
42 { /* Set our priority. */
43 int prio = old_priority + adjustment;
45 if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
46 bb_perror_msg_and_die("setpriority(%d)", prio);
50 BB_EXECVP_or_die(argv);