Annotation of /trunk/mkinitrd-magellan/busybox/coreutils/nice.c
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Revision 532 -
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
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Sat Sep 1 22:45:15 2007 UTC (16 years, 9 months ago) by niro
File MIME type: text/plain
File size: 1339 byte(s)
-import if magellan mkinitrd; it is a fork of redhats mkinitrd-5.0.8 with all magellan patches and features; deprecates magellan-src/mkinitrd
1 | niro | 532 | /* 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 "busybox.h" | ||
12 | |||
13 | int nice_main(int argc, char **argv) | ||
14 | { | ||
15 | int old_priority, adjustment; | ||
16 | |||
17 | old_priority = getpriority(PRIO_PROCESS, 0); | ||
18 | |||
19 | if (!*++argv) { /* No args, so (GNU) output current nice value. */ | ||
20 | printf("%d\n", old_priority); | ||
21 | fflush_stdout_and_exit(EXIT_SUCCESS); | ||
22 | } | ||
23 | |||
24 | adjustment = 10; /* Set default adjustment. */ | ||
25 | |||
26 | if (argv[0][0] == '-') { | ||
27 | if (argv[0][1] == 'n') { /* -n */ | ||
28 | if (argv[0][2]) { /* -nNNNN (w/o space) */ | ||
29 | argv[0] += 2; argv--; argc++; | ||
30 | } | ||
31 | } else { /* -NNN (NNN may be negative) == -n NNN */ | ||
32 | argv[0] += 1; argv--; argc++; | ||
33 | } | ||
34 | if (argc < 4) { /* Missing priority and/or utility! */ | ||
35 | bb_show_usage(); | ||
36 | } | ||
37 | adjustment = xatoi_range(argv[1], INT_MIN/2, INT_MAX/2); | ||
38 | argv += 2; | ||
39 | } | ||
40 | |||
41 | { /* Set our priority. */ | ||
42 | int prio = old_priority + adjustment; | ||
43 | |||
44 | if (setpriority(PRIO_PROCESS, 0, prio) < 0) { | ||
45 | bb_perror_msg_and_die("setpriority(%d)", prio); | ||
46 | } | ||
47 | } | ||
48 | |||
49 | execvp(*argv, argv); /* Now exec the desired program. */ | ||
50 | |||
51 | /* The exec failed... */ | ||
52 | xfunc_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */ | ||
53 | bb_perror_msg_and_die("%s", *argv); | ||
54 | } |