Contents of /tags/mkinitrd-6_1_6/busybox/coreutils/nice.c
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Wed Aug 5 19:21:45 2009 UTC (15 years, 1 month ago) by niro
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Wed Aug 5 19:21:45 2009 UTC (15 years, 1 month ago) by niro
File MIME type: text/plain
File size: 1403 byte(s)
tagged 'mkinitrd-6_1_6'
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 tarball for details. |
8 | */ |
9 | |
10 | #include <sys/resource.h> |
11 | #include "libbb.h" |
12 | |
13 | int nice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
14 | int nice_main(int argc, char **argv) |
15 | { |
16 | int old_priority, adjustment; |
17 | |
18 | old_priority = getpriority(PRIO_PROCESS, 0); |
19 | |
20 | if (!*++argv) { /* No args, so (GNU) output current nice value. */ |
21 | printf("%d\n", old_priority); |
22 | fflush_stdout_and_exit(EXIT_SUCCESS); |
23 | } |
24 | |
25 | adjustment = 10; /* Set default adjustment. */ |
26 | |
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++; |
31 | } |
32 | } else { /* -NNN (NNN may be negative) == -n NNN */ |
33 | argv[0] += 1; argv--; argc++; |
34 | } |
35 | if (argc < 4) { /* Missing priority and/or utility! */ |
36 | bb_show_usage(); |
37 | } |
38 | adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2); |
39 | argv += 2; |
40 | } |
41 | |
42 | { /* Set our priority. */ |
43 | int prio = old_priority + adjustment; |
44 | |
45 | if (setpriority(PRIO_PROCESS, 0, prio) < 0) { |
46 | bb_perror_msg_and_die("setpriority(%d)", prio); |
47 | } |
48 | } |
49 | |
50 | BB_EXECVP(*argv, argv); /* Now exec the desired program. */ |
51 | |
52 | /* The exec failed... */ |
53 | xfunc_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */ |
54 | bb_simple_perror_msg_and_die(*argv); |
55 | } |