67 lines
1.7 KiB
C
67 lines
1.7 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* nice implementation for busybox
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*
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* Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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//config:config NICE
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//config: bool "nice (1.8 kb)"
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//config: default y
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//config: help
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//config: nice runs a program with modified scheduling priority.
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//applet:IF_NICE(APPLET(nice, BB_DIR_BIN, BB_SUID_DROP))
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//kbuild:lib-$(CONFIG_NICE) += nice.o
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//usage:#define nice_trivial_usage
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//usage: "[-n ADJUST] [PROG ARGS]"
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//usage:#define nice_full_usage "\n\n"
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//usage: "Change scheduling priority, run PROG\n"
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//usage: "\n -n ADJUST Adjust priority by ADJUST"
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#include <sys/resource.h>
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#include "libbb.h"
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int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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int nice_main(int argc, char **argv)
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{
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int old_priority, adjustment;
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old_priority = getpriority(PRIO_PROCESS, 0);
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if (!*++argv) { /* No args, so (GNU) output current nice value. */
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printf("%d\n", old_priority);
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fflush_stdout_and_exit(EXIT_SUCCESS);
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}
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adjustment = 10; /* Set default adjustment. */
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if (argv[0][0] == '-') {
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if (argv[0][1] == 'n') { /* -n */
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if (argv[0][2]) { /* -nNNNN (w/o space) */
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argv[0] += 2; argv--; argc++;
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}
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} else { /* -NNN (NNN may be negative) == -n NNN */
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argv[0] += 1; argv--; argc++;
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}
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if (argc < 4) { /* Missing priority and/or utility! */
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bb_show_usage();
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}
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adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
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argv += 2;
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}
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{ /* Set our priority. */
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int prio = old_priority + adjustment;
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if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
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bb_perror_msg_and_die("setpriority(%d)", prio);
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}
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}
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BB_EXECVP_or_die(argv);
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}
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