source: branches/3.2/mindi-busybox/coreutils/nice.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 6 years ago
  • Update mindi-busybox to 1.21.1
File size: 1.4 KB
Line 
1/* vi: set sw=4 ts=4: */
2/*
3 * nice implementation for busybox
4 *
5 * Copyright (C) 2005  Manuel Novoa III  <mjn3@codepoet.org>
6 *
7 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
8 */
9
10//usage:#define nice_trivial_usage
11//usage:       "[-n ADJUST] [PROG ARGS]"
12//usage:#define nice_full_usage "\n\n"
13//usage:       "Change scheduling priority, run PROG\n"
14//usage:     "\n    -n ADJUST   Adjust priority by ADJUST"
15
16#include <sys/resource.h>
17#include "libbb.h"
18
19int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
20int nice_main(int argc, char **argv)
21{
22    int old_priority, adjustment;
23
24    old_priority = getpriority(PRIO_PROCESS, 0);
25
26    if (!*++argv) { /* No args, so (GNU) output current nice value. */
27        printf("%d\n", old_priority);
28        fflush_stdout_and_exit(EXIT_SUCCESS);
29    }
30
31    adjustment = 10;  /* Set default adjustment. */
32
33    if (argv[0][0] == '-') {
34        if (argv[0][1] == 'n') { /* -n */
35            if (argv[0][2]) { /* -nNNNN (w/o space) */
36                argv[0] += 2; argv--; argc++;
37            }
38        } else { /* -NNN (NNN may be negative) == -n NNN */
39            argv[0] += 1; argv--; argc++;
40        }
41        if (argc < 4) {  /* Missing priority and/or utility! */
42            bb_show_usage();
43        }
44        adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2);
45        argv += 2;
46    }
47
48    {  /* Set our priority. */
49        int prio = old_priority + adjustment;
50
51        if (setpriority(PRIO_PROCESS, 0, prio) < 0) {
52            bb_perror_msg_and_die("setpriority(%d)", prio);
53        }
54    }
55
56    BB_EXECVP_or_die(argv);
57}
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