1 | /* vi: set sw=4 ts=4: */
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2 | /*
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3 | * ipcrm.c - utility to allow removal of IPC objects and data structures.
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4 | *
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5 | * 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
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6 | * Adapted for busybox from util-linux-2.12a.
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7 | *
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8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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9 | */
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10 |
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11 | #include "libbb.h"
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12 |
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13 | /* X/OPEN tells us to use <sys/{types,ipc,sem}.h> for semctl() */
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14 | /* X/OPEN tells us to use <sys/{types,ipc,msg}.h> for msgctl() */
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15 | #include <sys/ipc.h>
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16 | #include <sys/shm.h>
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17 | #include <sys/msg.h>
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18 | #include <sys/sem.h>
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19 |
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20 | #if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
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21 | /* union semun is defined by including <sys/sem.h> */
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22 | #else
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23 | /* according to X/OPEN we have to define it ourselves */
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24 | union semun {
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25 | int val;
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26 | struct semid_ds *buf;
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27 | unsigned short int *array;
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28 | struct seminfo *__buf;
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29 | };
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30 | #endif
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31 |
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32 | #define IPCRM_LEGACY 1
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33 |
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34 |
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35 | #if IPCRM_LEGACY
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36 |
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37 | typedef enum type_id {
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38 | SHM,
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39 | SEM,
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40 | MSG
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41 | } type_id;
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42 |
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43 | static int remove_ids(type_id type, int argc, char **argv)
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44 | {
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45 | unsigned long id;
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46 | int ret = 0; /* silence gcc */
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47 | int nb_errors = 0;
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48 | union semun arg;
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49 |
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50 | arg.val = 0;
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51 |
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52 | while (argc) {
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53 | id = bb_strtoul(argv[0], NULL, 10);
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54 | if (errno || id > INT_MAX) {
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55 | bb_error_msg("invalid id: %s", argv[0]);
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56 | nb_errors++;
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57 | } else {
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58 | if (type == SEM)
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59 | ret = semctl(id, 0, IPC_RMID, arg);
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60 | else if (type == MSG)
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61 | ret = msgctl(id, IPC_RMID, NULL);
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62 | else if (type == SHM)
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63 | ret = shmctl(id, IPC_RMID, NULL);
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64 |
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65 | if (ret) {
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66 | bb_perror_msg("cannot remove id %s", argv[0]);
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67 | nb_errors++;
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68 | }
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69 | }
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70 | argc--;
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71 | argv++;
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72 | }
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73 |
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74 | return nb_errors;
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75 | }
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76 | #endif /* IPCRM_LEGACY */
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77 |
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78 |
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79 | int ipcrm_main(int argc, char **argv);
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80 | int ipcrm_main(int argc, char **argv)
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81 | {
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82 | int c;
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83 | int error = 0;
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84 |
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85 | /* if the command is executed without parameters, do nothing */
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86 | if (argc == 1)
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87 | return 0;
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88 | #if IPCRM_LEGACY
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89 | /* check to see if the command is being invoked in the old way if so
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90 | then run the old code. Valid commands are msg, shm, sem. */
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91 | {
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92 | type_id what = 0; /* silence gcc */
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93 | char w;
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94 |
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95 | w=argv[1][0];
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96 | if ( ((w == 'm' && argv[1][1] == 's' && argv[1][2] == 'g')
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97 | || (argv[1][0] == 's'
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98 | && ((w=argv[1][1]) == 'h' || w == 'e')
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99 | && argv[1][2] == 'm')
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100 | ) && argv[1][3] == '\0'
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101 | ) {
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102 |
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103 | if (argc < 3)
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104 | bb_show_usage();
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105 |
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106 | if (w == 'h')
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107 | what = SHM;
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108 | else if (w == 'm')
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109 | what = MSG;
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110 | else if (w == 'e')
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111 | what = SEM;
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112 |
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113 | if (remove_ids(what, argc-2, &argv[2]))
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114 | fflush_stdout_and_exit(1);
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115 | printf("resource(s) deleted\n");
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116 | return 0;
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117 | }
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118 | }
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119 | #endif /* IPCRM_LEGACY */
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120 |
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121 | /* process new syntax to conform with SYSV ipcrm */
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122 | while ((c = getopt(argc, argv, "q:m:s:Q:M:S:h?")) != -1) {
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123 | int result;
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124 | int id = 0;
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125 | int iskey = (isupper)(c);
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126 |
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127 | /* needed to delete semaphores */
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128 | union semun arg;
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129 |
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130 | arg.val = 0;
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131 |
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132 | if ((c == '?') || (c == 'h')) {
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133 | bb_show_usage();
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134 | }
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135 |
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136 | /* we don't need case information any more */
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137 | c = tolower(c);
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138 |
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139 | /* make sure the option is in range: allowed are q, m, s */
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140 | if (c != 'q' && c != 'm' && c != 's') {
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141 | bb_show_usage();
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142 | }
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143 |
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144 | if (iskey) {
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145 | /* keys are in hex or decimal */
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146 | key_t key = xstrtoul(optarg, 0);
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147 |
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148 | if (key == IPC_PRIVATE) {
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149 | error++;
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150 | bb_error_msg("illegal key (%s)", optarg);
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151 | continue;
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152 | }
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153 |
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154 | /* convert key to id */
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155 | id = ((c == 'q') ? msgget(key, 0) :
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156 | (c == 'm') ? shmget(key, 0, 0) : semget(key, 0, 0));
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157 |
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158 | if (id < 0) {
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159 | const char *errmsg;
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160 |
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161 | error++;
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162 | switch (errno) {
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163 | case EACCES:
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164 | errmsg = "permission denied for";
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165 | break;
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166 | case EIDRM:
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167 | errmsg = "already removed";
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168 | break;
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169 | case ENOENT:
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170 | errmsg = "invalid";
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171 | break;
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172 | default:
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173 | errmsg = "unknown error in";
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174 | break;
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175 | }
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176 | bb_error_msg("%s %s (%s)", errmsg, "key", optarg);
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177 | continue;
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178 | }
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179 | } else {
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180 | /* ids are in decimal */
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181 | id = xatoul(optarg);
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182 | }
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183 |
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184 | result = ((c == 'q') ? msgctl(id, IPC_RMID, NULL) :
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185 | (c == 'm') ? shmctl(id, IPC_RMID, NULL) :
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186 | semctl(id, 0, IPC_RMID, arg));
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187 |
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188 | if (result) {
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189 | const char *errmsg;
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190 | const char *const what = iskey ? "key" : "id";
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191 |
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192 | error++;
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193 | switch (errno) {
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194 | case EACCES:
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195 | case EPERM:
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196 | errmsg = "permission denied for";
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197 | break;
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198 | case EINVAL:
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199 | errmsg = "invalid";
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200 | break;
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201 | case EIDRM:
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202 | errmsg = "already removed";
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203 | break;
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204 | default:
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205 | errmsg = "unknown error in";
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206 | break;
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207 | }
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208 | bb_error_msg("%s %s (%s)", errmsg, what, optarg);
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209 | continue;
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210 | }
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211 | }
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212 |
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213 | /* print usage if we still have some arguments left over */
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214 | if (optind != argc) {
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215 | bb_show_usage();
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216 | }
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217 |
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218 | /* exit value reflects the number of errors encountered */
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219 | return error;
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220 | }
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