Contents of /trunk/mkinitrd-magellan/busybox/procps/renice.c
Parent Directory | Revision Log
Revision 532 -
(show annotations)
(download)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 3143 byte(s)
Sat Sep 1 22:45:15 2007 UTC (17 years ago) by niro
File MIME type: text/plain
File size: 3143 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 | /* vi: set sw=4 ts=4: */ |
2 | /* |
3 | * renice implementation for busybox |
4 | * |
5 | * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org> |
6 | * |
7 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball. |
8 | */ |
9 | |
10 | /* Notes: |
11 | * Setting an absolute priority was obsoleted in SUSv2 and removed |
12 | * in SUSv3. However, the common linux version of renice does |
13 | * absolute and not relative. So we'll continue supporting absolute, |
14 | * although the stdout logging has been removed since both SUSv2 and |
15 | * SUSv3 specify that stdout isn't used. |
16 | * |
17 | * This version is lenient in that it doesn't require any IDs. The |
18 | * options -p, -g, and -u are treated as mode switches for the |
19 | * following IDs (if any). Multiple switches are allowed. |
20 | */ |
21 | |
22 | #include "busybox.h" |
23 | #include <sys/resource.h> |
24 | |
25 | void BUG_bad_PRIO_PROCESS(void); |
26 | void BUG_bad_PRIO_PGRP(void); |
27 | void BUG_bad_PRIO_USER(void); |
28 | |
29 | int renice_main(int argc, char **argv) |
30 | { |
31 | static const char Xetpriority_msg[] = "%cetpriority"; |
32 | |
33 | int retval = EXIT_SUCCESS; |
34 | int which = PRIO_PROCESS; /* Default 'which' value. */ |
35 | int use_relative = 0; |
36 | int adjustment, new_priority; |
37 | unsigned who; |
38 | char *arg; |
39 | |
40 | /* Yes, they are not #defines in glibc 2.4! #if won't work */ |
41 | if (PRIO_PROCESS < CHAR_MIN || PRIO_PROCESS > CHAR_MAX) |
42 | BUG_bad_PRIO_PROCESS(); |
43 | if (PRIO_PGRP < CHAR_MIN || PRIO_PGRP > CHAR_MAX) |
44 | BUG_bad_PRIO_PGRP(); |
45 | if (PRIO_USER < CHAR_MIN || PRIO_USER > CHAR_MAX) |
46 | BUG_bad_PRIO_USER(); |
47 | |
48 | arg = *++argv; |
49 | |
50 | /* Check if we are using a relative adjustment. */ |
51 | if (arg && arg[0] == '-' && arg[1] == 'n') { |
52 | use_relative = 1; |
53 | if (!arg[2]) |
54 | arg = *++argv; |
55 | else |
56 | arg += 2; |
57 | } |
58 | |
59 | if (!arg) { /* No args? Then show usage. */ |
60 | bb_show_usage(); |
61 | } |
62 | |
63 | /* Get the priority adjustment (absolute or relative). */ |
64 | adjustment = xatoi_range(arg, INT_MIN/2, INT_MAX/2); |
65 | |
66 | while ((arg = *++argv) != NULL) { |
67 | /* Check for a mode switch. */ |
68 | if (arg[0] == '-' && arg[1]) { |
69 | static const char opts[] |
70 | = { 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER }; |
71 | const char *p = strchr(opts, arg[1]); |
72 | if (p) { |
73 | which = p[4]; |
74 | if (!arg[2]) |
75 | continue; |
76 | arg += 2; |
77 | } |
78 | } |
79 | |
80 | /* Process an ID arg. */ |
81 | if (which == PRIO_USER) { |
82 | struct passwd *p; |
83 | p = getpwnam(arg); |
84 | if (!p) { |
85 | bb_error_msg("unknown user: %s", arg); |
86 | goto HAD_ERROR; |
87 | } |
88 | who = p->pw_uid; |
89 | } else { |
90 | who = bb_strtou(arg, NULL, 10); |
91 | if (errno) { |
92 | bb_error_msg("bad value: %s", arg); |
93 | goto HAD_ERROR; |
94 | } |
95 | } |
96 | |
97 | /* Get priority to use, and set it. */ |
98 | if (use_relative) { |
99 | int old_priority; |
100 | |
101 | errno = 0; /* Needed for getpriority error detection. */ |
102 | old_priority = getpriority(which, who); |
103 | if (errno) { |
104 | bb_perror_msg(Xetpriority_msg, 'g'); |
105 | goto HAD_ERROR; |
106 | } |
107 | |
108 | new_priority = old_priority + adjustment; |
109 | } else { |
110 | new_priority = adjustment; |
111 | } |
112 | |
113 | if (setpriority(which, who, new_priority) == 0) { |
114 | continue; |
115 | } |
116 | |
117 | bb_perror_msg(Xetpriority_msg, 's'); |
118 | HAD_ERROR: |
119 | retval = EXIT_FAILURE; |
120 | } |
121 | |
122 | /* No need to check for errors outputing to stderr since, if it |
123 | * was used, the HAD_ERROR label was reached and retval was set. */ |
124 | |
125 | return retval; |
126 | } |