1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * renice implementation for busybox
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4 | *
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5 | * Copyright (C) 2005 Manuel Novoa III <mjn3@codepoet.org>
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6 | *
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7 | * Licensed under GPLv2 or later, see file LICENSE in this source tree.
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8 | */
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9 |
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10 | /* Notes:
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11 | * Setting an absolute priority was obsoleted in SUSv2 and removed
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12 | * in SUSv3. However, the common linux version of renice does
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13 | * absolute and not relative. So we'll continue supporting absolute,
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14 | * although the stdout logging has been removed since both SUSv2 and
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15 | * SUSv3 specify that stdout isn't used.
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16 | *
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17 | * This version is lenient in that it doesn't require any IDs. The
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18 | * options -p, -g, and -u are treated as mode switches for the
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19 | * following IDs (if any). Multiple switches are allowed.
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20 | */
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21 |
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22 | #include "libbb.h"
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23 | #include <sys/resource.h>
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24 |
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25 | void BUG_bad_PRIO_PROCESS(void);
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26 | void BUG_bad_PRIO_PGRP(void);
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27 | void BUG_bad_PRIO_USER(void);
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28 |
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29 | int renice_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
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30 | int renice_main(int argc UNUSED_PARAM, char **argv)
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31 | {
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32 | static const char Xetpriority_msg[] ALIGN1 = "%cetpriority";
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33 |
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34 | int retval = EXIT_SUCCESS;
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35 | int which = PRIO_PROCESS; /* Default 'which' value. */
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36 | int use_relative = 0;
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37 | int adjustment, new_priority;
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38 | unsigned who;
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39 | char *arg;
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40 |
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41 | /* Yes, they are not #defines in glibc 2.4! #if won't work */
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42 | if (PRIO_PROCESS < CHAR_MIN || PRIO_PROCESS > CHAR_MAX)
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43 | BUG_bad_PRIO_PROCESS();
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44 | if (PRIO_PGRP < CHAR_MIN || PRIO_PGRP > CHAR_MAX)
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45 | BUG_bad_PRIO_PGRP();
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46 | if (PRIO_USER < CHAR_MIN || PRIO_USER > CHAR_MAX)
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47 | BUG_bad_PRIO_USER();
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48 |
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49 | arg = *++argv;
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50 |
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51 | /* Check if we are using a relative adjustment. */
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52 | if (arg && arg[0] == '-' && arg[1] == 'n') {
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53 | use_relative = 1;
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54 | if (!arg[2])
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55 | arg = *++argv;
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56 | else
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57 | arg += 2;
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58 | }
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59 |
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60 | if (!arg) { /* No args? Then show usage. */
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61 | bb_show_usage();
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62 | }
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63 |
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64 | /* Get the priority adjustment (absolute or relative). */
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65 | adjustment = xatoi_range(arg, INT_MIN/2, INT_MAX/2);
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66 |
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67 | while ((arg = *++argv) != NULL) {
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68 | /* Check for a mode switch. */
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69 | if (arg[0] == '-' && arg[1]) {
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70 | static const char opts[] ALIGN1 = {
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71 | 'p', 'g', 'u', 0, PRIO_PROCESS, PRIO_PGRP, PRIO_USER
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72 | };
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73 | const char *p = strchr(opts, arg[1]);
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74 | if (p) {
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75 | which = p[4];
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76 | if (!arg[2])
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77 | continue;
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78 | arg += 2;
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79 | }
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80 | }
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81 |
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82 | /* Process an ID arg. */
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83 | if (which == PRIO_USER) {
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84 | struct passwd *p;
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85 | p = getpwnam(arg);
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86 | if (!p) {
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87 | bb_error_msg("unknown user %s", arg);
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88 | goto HAD_ERROR;
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89 | }
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90 | who = p->pw_uid;
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91 | } else {
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92 | who = bb_strtou(arg, NULL, 10);
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93 | if (errno) {
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94 | bb_error_msg("invalid number '%s'", arg);
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95 | goto HAD_ERROR;
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96 | }
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97 | }
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98 |
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99 | /* Get priority to use, and set it. */
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100 | if (use_relative) {
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101 | int old_priority;
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102 |
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103 | errno = 0; /* Needed for getpriority error detection. */
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104 | old_priority = getpriority(which, who);
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105 | if (errno) {
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106 | bb_perror_msg(Xetpriority_msg, 'g');
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107 | goto HAD_ERROR;
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108 | }
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109 |
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110 | new_priority = old_priority + adjustment;
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111 | } else {
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112 | new_priority = adjustment;
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113 | }
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114 |
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115 | if (setpriority(which, who, new_priority) == 0) {
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116 | continue;
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117 | }
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118 |
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119 | bb_perror_msg(Xetpriority_msg, 's');
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120 | HAD_ERROR:
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121 | retval = EXIT_FAILURE;
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122 | }
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123 |
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124 | /* No need to check for errors outputing to stderr since, if it
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125 | * was used, the HAD_ERROR label was reached and retval was set. */
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126 |
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127 | return retval;
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128 | }
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