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author | mjn3 <mjn3@69ca8d6d-28ef-0310-b511-8ec308f3f277> | 2005-02-13 20:14:05 +0000 |
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committer | mjn3 <mjn3@69ca8d6d-28ef-0310-b511-8ec308f3f277> | 2005-02-13 20:14:05 +0000 |
commit | 5af44a5ebf0fac0fe151699c8b8656e45ccde762 (patch) | |
tree | d57c8dd9efa4c30cd01290f878cae688ae792cc0 /coreutils/nice.c | |
parent | cc7c98b345fdb226ae9b99cc5eb9ba9325b533ce (diff) | |
download | busybox-w32-5af44a5ebf0fac0fe151699c8b8656e45ccde762.tar.gz busybox-w32-5af44a5ebf0fac0fe151699c8b8656e45ccde762.tar.bz2 busybox-w32-5af44a5ebf0fac0fe151699c8b8656e45ccde762.zip |
Add 'nice' and replace 'renice' with a new implementation.
git-svn-id: svn://busybox.net/trunk/busybox@9868 69ca8d6d-28ef-0310-b511-8ec308f3f277
Diffstat (limited to 'coreutils/nice.c')
-rw-r--r-- | coreutils/nice.c | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/coreutils/nice.c b/coreutils/nice.c new file mode 100644 index 000000000..b66f9d82d --- /dev/null +++ b/coreutils/nice.c | |||
@@ -0,0 +1,86 @@ | |||
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 | * This program is free software; you can redistribute it and/or modify | ||
8 | * it under the terms of the GNU General Public License as published by | ||
9 | * the Free Software Foundation; either version 2 of the License, or | ||
10 | * (at your option) any later version. | ||
11 | * | ||
12 | * This program is distributed in the hope that it will be useful, | ||
13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | ||
15 | * General Public License for more details. | ||
16 | * | ||
17 | * You should have received a copy of the GNU General Public License | ||
18 | * along with this program; if not, write to the Free Software | ||
19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | ||
20 | * | ||
21 | */ | ||
22 | |||
23 | #include <stdio.h> | ||
24 | #include <stdlib.h> | ||
25 | #include <string.h> | ||
26 | #include <limits.h> | ||
27 | #include <errno.h> | ||
28 | #include <unistd.h> | ||
29 | #include <sys/time.h> | ||
30 | #include <sys/resource.h> | ||
31 | #include "busybox.h" | ||
32 | |||
33 | static inline int int_add_no_wrap(int a, int b) | ||
34 | { | ||
35 | int s = a + b; | ||
36 | |||
37 | if (b < 0) { | ||
38 | if (s > a) s = INT_MIN; | ||
39 | } else { | ||
40 | if (s < a) s = INT_MAX; | ||
41 | } | ||
42 | |||
43 | return s; | ||
44 | } | ||
45 | |||
46 | int nice_main(int argc, char **argv) | ||
47 | { | ||
48 | static const char Xetpriority_msg[] = "cannot %cet priority"; | ||
49 | |||
50 | int old_priority, adjustment; | ||
51 | |||
52 | errno = 0; /* Needed for getpriority error detection. */ | ||
53 | old_priority = getpriority(PRIO_PROCESS, 0); | ||
54 | if (errno) { | ||
55 | bb_perror_msg_and_die(Xetpriority_msg, 'g'); | ||
56 | } | ||
57 | |||
58 | if (!*++argv) { /* No args, so (GNU) output current nice value. */ | ||
59 | bb_printf("%d\n", old_priority); | ||
60 | bb_fflush_stdout_and_exit(EXIT_SUCCESS); | ||
61 | } | ||
62 | |||
63 | adjustment = 10; /* Set default adjustment. */ | ||
64 | |||
65 | if ((argv[0][0] == '-') && (argv[0][1] == 'n') && !argv[0][2]) { /* "-n" */ | ||
66 | if (argc < 4) { /* Missing priority and/or utility! */ | ||
67 | bb_show_usage(); | ||
68 | } | ||
69 | adjustment = bb_xgetlarg(argv[1], 10, INT_MIN, INT_MAX); | ||
70 | argv += 2; | ||
71 | } | ||
72 | |||
73 | { /* Set our priority. Handle integer wrapping for old + adjust. */ | ||
74 | int new_priority = int_add_no_wrap(old_priority, adjustment); | ||
75 | |||
76 | if (setpriority(PRIO_PROCESS, 0, new_priority) < 0) { | ||
77 | bb_perror_msg_and_die(Xetpriority_msg, 's'); | ||
78 | } | ||
79 | } | ||
80 | |||
81 | execvp(*argv, argv); /* Now exec the desired program. */ | ||
82 | |||
83 | /* The exec failed... */ | ||
84 | bb_default_error_retval = (errno == ENOENT) ? 127 : 126; /* SUSv3 */ | ||
85 | bb_perror_msg_and_die("%s", *argv); | ||
86 | } | ||