Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Eric Andersen | bf960f5 | 2000-07-21 21:32:12 +0000 | [diff] [blame] | 2 | /* |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 3 | * renice implementation for busybox |
Eric Andersen | bf960f5 | 2000-07-21 21:32:12 +0000 | [diff] [blame] | 4 | * |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 5 | * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org> |
Eric Andersen | bf960f5 | 2000-07-21 21:32:12 +0000 | [diff] [blame] | 6 | * |
Denys Vlasenko | 0ef64bd | 2010-08-16 20:14:46 +0200 | [diff] [blame] | 7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
Eric Andersen | bf960f5 | 2000-07-21 21:32:12 +0000 | [diff] [blame] | 8 | */ |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 9 | /* Notes: |
| 10 | * Setting an absolute priority was obsoleted in SUSv2 and removed |
| 11 | * in SUSv3. However, the common linux version of renice does |
| 12 | * absolute and not relative. So we'll continue supporting absolute, |
| 13 | * although the stdout logging has been removed since both SUSv2 and |
| 14 | * SUSv3 specify that stdout isn't used. |
| 15 | * |
| 16 | * This version is lenient in that it doesn't require any IDs. The |
| 17 | * options -p, -g, and -u are treated as mode switches for the |
| 18 | * following IDs (if any). Multiple switches are allowed. |
| 19 | */ |
Denys Vlasenko | f8f81ed | 2016-11-23 06:23:44 +0100 | [diff] [blame] | 20 | //config:config RENICE |
Denys Vlasenko | b097a84 | 2018-12-28 03:20:17 +0100 | [diff] [blame] | 21 | //config: bool "renice (4.2 kb)" |
Denys Vlasenko | f8f81ed | 2016-11-23 06:23:44 +0100 | [diff] [blame] | 22 | //config: default y |
| 23 | //config: help |
Denys Vlasenko | 72089cf | 2017-07-21 09:50:55 +0200 | [diff] [blame] | 24 | //config: Renice alters the scheduling priority of one or more running |
| 25 | //config: processes. |
Denys Vlasenko | f8f81ed | 2016-11-23 06:23:44 +0100 | [diff] [blame] | 26 | |
Denys Vlasenko | 1a1203f | 2017-08-07 16:47:34 +0200 | [diff] [blame] | 27 | //applet:IF_RENICE(APPLET_NOEXEC(renice, renice, BB_DIR_USR_BIN, BB_SUID_DROP, renice)) |
Denys Vlasenko | f8f81ed | 2016-11-23 06:23:44 +0100 | [diff] [blame] | 28 | |
| 29 | //kbuild:lib-$(CONFIG_RENICE) += renice.o |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 30 | |
Pere Orga | 5bc8c00 | 2011-04-11 03:29:49 +0200 | [diff] [blame] | 31 | //usage:#define renice_trivial_usage |
Denys Vlasenko | 1f60d88 | 2021-06-15 10:00:18 +0200 | [diff] [blame^] | 32 | //usage: "[-n] PRIORITY [[-p|g|u] ID...]..." |
Pere Orga | 5bc8c00 | 2011-04-11 03:29:49 +0200 | [diff] [blame] | 33 | //usage:#define renice_full_usage "\n\n" |
Denys Vlasenko | d2b820b | 2016-03-07 15:21:54 +0100 | [diff] [blame] | 34 | //usage: "Change scheduling priority of a running process\n" |
| 35 | //usage: "\n -n Add PRIORITY to current nice value" |
| 36 | //usage: "\n Without -n, nice value is set to PRIORITY" |
| 37 | //usage: "\n -p Process ids (default)" |
| 38 | //usage: "\n -g Process group ids" |
| 39 | //usage: "\n -u Process user names" |
Pere Orga | 5bc8c00 | 2011-04-11 03:29:49 +0200 | [diff] [blame] | 40 | |
Denis Vlasenko | b6adbf1 | 2007-05-26 19:00:18 +0000 | [diff] [blame] | 41 | #include "libbb.h" |
Eric Andersen | bf960f5 | 2000-07-21 21:32:12 +0000 | [diff] [blame] | 42 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 43 | int renice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 44 | int renice_main(int argc UNUSED_PARAM, char **argv) |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 45 | { |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame] | 46 | static const char Xetpriority_msg[] ALIGN1 = "%cetpriority"; |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 47 | |
| 48 | int retval = EXIT_SUCCESS; |
Denys Vlasenko | e4dcba1 | 2010-10-28 18:57:19 +0200 | [diff] [blame] | 49 | int which = PRIO_PROCESS; /* Default 'which' value. */ |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 50 | int use_relative = 0; |
| 51 | int adjustment, new_priority; |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 52 | unsigned who; |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 53 | char *arg; |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 54 | |
Denis Vlasenko | a7189f0 | 2006-11-17 20:29:00 +0000 | [diff] [blame] | 55 | /* Yes, they are not #defines in glibc 2.4! #if won't work */ |
Denys Vlasenko | 9967978 | 2018-01-14 19:05:02 +0100 | [diff] [blame] | 56 | BUILD_BUG_ON(PRIO_PROCESS < CHAR_MIN || PRIO_PROCESS > CHAR_MAX); |
| 57 | BUILD_BUG_ON(PRIO_PGRP < CHAR_MIN || PRIO_PGRP > CHAR_MAX); |
| 58 | BUILD_BUG_ON(PRIO_USER < CHAR_MIN || PRIO_USER > CHAR_MAX); |
Denis Vlasenko | a7189f0 | 2006-11-17 20:29:00 +0000 | [diff] [blame] | 59 | |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 60 | arg = *++argv; |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 61 | |
| 62 | /* Check if we are using a relative adjustment. */ |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 63 | if (arg && arg[0] == '-' && arg[1] == 'n') { |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 64 | use_relative = 1; |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 65 | if (!arg[2]) |
| 66 | arg = *++argv; |
| 67 | else |
| 68 | arg += 2; |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 69 | } |
| 70 | |
Denys Vlasenko | e4dcba1 | 2010-10-28 18:57:19 +0200 | [diff] [blame] | 71 | if (!arg) { /* No args? Then show usage. */ |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 72 | bb_show_usage(); |
| 73 | } |
| 74 | |
| 75 | /* Get the priority adjustment (absolute or relative). */ |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 76 | adjustment = xatoi_range(arg, INT_MIN/2, INT_MAX/2); |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 77 | |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 78 | while ((arg = *++argv) != NULL) { |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 79 | /* Check for a mode switch. */ |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 80 | if (arg[0] == '-' && arg[1]) { |
Denis Vlasenko | 6ca409e | 2007-08-12 20:58:27 +0000 | [diff] [blame] | 81 | static const char opts[] ALIGN1 = { |
| 82 | 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER |
| 83 | }; |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 84 | const char *p = strchr(opts, arg[1]); |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 85 | if (p) { |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 86 | which = p[4]; |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 87 | if (!arg[2]) |
| 88 | continue; |
| 89 | arg += 2; |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 90 | } |
| 91 | } |
| 92 | |
| 93 | /* Process an ID arg. */ |
| 94 | if (which == PRIO_USER) { |
| 95 | struct passwd *p; |
Denys Vlasenko | c4144ca | 2018-01-14 19:40:00 +0100 | [diff] [blame] | 96 | /* NB: use of getpwnam makes it risky to be NOFORK, switch to getpwnam_r? */ |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 97 | p = getpwnam(arg); |
Denis Vlasenko | 1385899 | 2006-10-08 12:49:22 +0000 | [diff] [blame] | 98 | if (!p) { |
Bernhard Reutner-Fischer | d73cbd3 | 2008-07-21 14:41:33 +0000 | [diff] [blame] | 99 | bb_error_msg("unknown user %s", arg); |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 100 | goto HAD_ERROR; |
| 101 | } |
| 102 | who = p->pw_uid; |
| 103 | } else { |
Denis Vlasenko | d686a04 | 2006-11-27 14:43:21 +0000 | [diff] [blame] | 104 | who = bb_strtou(arg, NULL, 10); |
| 105 | if (errno) { |
Denys Vlasenko | b32a543 | 2010-08-29 13:29:02 +0200 | [diff] [blame] | 106 | bb_error_msg("invalid number '%s'", arg); |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 107 | goto HAD_ERROR; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /* Get priority to use, and set it. */ |
| 112 | if (use_relative) { |
| 113 | int old_priority; |
| 114 | |
Denys Vlasenko | e4dcba1 | 2010-10-28 18:57:19 +0200 | [diff] [blame] | 115 | errno = 0; /* Needed for getpriority error detection. */ |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 116 | old_priority = getpriority(which, who); |
| 117 | if (errno) { |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 118 | bb_perror_msg(Xetpriority_msg, 'g'); |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 119 | goto HAD_ERROR; |
| 120 | } |
| 121 | |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 122 | new_priority = old_priority + adjustment; |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 123 | } else { |
| 124 | new_priority = adjustment; |
| 125 | } |
| 126 | |
| 127 | if (setpriority(which, who, new_priority) == 0) { |
| 128 | continue; |
| 129 | } |
| 130 | |
Denis Vlasenko | ca3c981 | 2006-10-08 23:36:17 +0000 | [diff] [blame] | 131 | bb_perror_msg(Xetpriority_msg, 's'); |
| 132 | HAD_ERROR: |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 133 | retval = EXIT_FAILURE; |
| 134 | } |
| 135 | |
Denys Vlasenko | 10ad622 | 2017-04-17 16:13:32 +0200 | [diff] [blame] | 136 | /* No need to check for errors outputting to stderr since, if it |
Manuel Novoa III | 2c51160 | 2005-02-13 20:14:05 +0000 | [diff] [blame] | 137 | * was used, the HAD_ERROR label was reached and retval was set. */ |
| 138 | |
| 139 | return retval; |
Eric Andersen | bf960f5 | 2000-07-21 21:32:12 +0000 | [diff] [blame] | 140 | } |