[821] | 1 | /*
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| 2 | * ipcrm.c -- utility to allow removal of IPC objects and data structures.
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| 3 | *
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| 4 | * 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
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| 5 | * Adapted for busybox from util-linux-2.12a.
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| 6 | *
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| 7 | * This program is free software; you can redistribute it and/or modify
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| 8 | * it under the terms of the GNU General Public License as published by
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| 9 | * the Free Software Foundation; either version 2 of the License, or
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| 10 | * (at your option) any later version.
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| 11 | *
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| 12 | * This program is distributed in the hope that it will be useful,
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| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 15 | * General Public License for more details.
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| 16 | *
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| 17 | * You should have received a copy of the GNU General Public License
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| 18 | * along with this program; if not, write to the Free Software
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| 19 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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| 20 | *
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| 21 | * --- Pre-busybox history from util-linux-2.12a ------------------------
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| 22 | *
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| 23 | * 1999-04-02 frank zago
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| 24 | * - can now remove several id's in the same call
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| 25 | *
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| 26 | * 1999-02-22 Arkadiusz Miÿkiewicz <misiek@pld.ORG.PL>
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| 27 | * - added Native Language Support
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| 28 | *
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| 29 | * Original author - krishna balasubramanian 1993
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| 30 | */
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| 31 |
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| 32 | #include <stdio.h>
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| 33 | #include <stdlib.h>
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| 34 | #include <string.h>
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| 35 | #include <errno.h>
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| 36 |
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| 37 | #include <sys/types.h>
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| 38 | #include <sys/ipc.h>
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| 39 | #include <sys/shm.h>
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| 40 | #include <sys/msg.h>
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| 41 | #include <sys/sem.h>
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| 42 |
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| 43 | /* X/OPEN tells us to use <sys/{types,ipc,sem}.h> for semctl() */
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| 44 | /* X/OPEN tells us to use <sys/{types,ipc,msg}.h> for msgctl() */
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| 45 | /* for getopt */
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| 46 | #include <unistd.h>
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| 47 |
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| 48 | /* for tolower and isupper */
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| 49 | #include <ctype.h>
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| 50 |
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| 51 | #include "busybox.h"
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| 52 |
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| 53 | #if defined (__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
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| 54 | /* union semun is defined by including <sys/sem.h> */
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| 55 | #else
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| 56 | /* according to X/OPEN we have to define it ourselves */
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| 57 | union semun {
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| 58 | int val;
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| 59 | struct semid_ds *buf;
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| 60 | unsigned short int *array;
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| 61 | struct seminfo *__buf;
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| 62 | };
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| 63 | #endif
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| 64 |
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| 65 | typedef enum type_id {
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| 66 | SHM,
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| 67 | SEM,
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| 68 | MSG
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| 69 | } type_id;
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| 70 |
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| 71 | static int
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| 72 | remove_ids(type_id type, int argc, char **argv) {
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| 73 | int id;
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| 74 | int ret = 0; /* for gcc */
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| 75 | char *end;
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| 76 | int nb_errors = 0;
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| 77 | union semun arg;
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| 78 |
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| 79 | arg.val = 0;
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| 80 |
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| 81 | while(argc) {
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| 82 |
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| 83 | id = strtoul(argv[0], &end, 10);
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| 84 |
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| 85 | if (*end != 0) {
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| 86 | bb_printf ("invalid id: %s\n", argv[0]);
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| 87 | nb_errors ++;
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| 88 | } else {
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| 89 | switch(type) {
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| 90 | case SEM:
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| 91 | ret = semctl (id, 0, IPC_RMID, arg);
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| 92 | break;
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| 93 |
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| 94 | case MSG:
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| 95 | ret = msgctl (id, IPC_RMID, NULL);
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| 96 | break;
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| 97 |
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| 98 | case SHM:
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| 99 | ret = shmctl (id, IPC_RMID, NULL);
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| 100 | break;
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| 101 | }
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| 102 |
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| 103 | if (ret) {
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| 104 | bb_printf ("cannot remove id %s (%s)\n",
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| 105 | argv[0], strerror(errno));
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| 106 | nb_errors ++;
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| 107 | }
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| 108 | }
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| 109 | argc--;
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| 110 | argv++;
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| 111 | }
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| 112 |
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| 113 | return(nb_errors);
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| 114 | }
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| 115 |
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| 116 | static int deprecated_main(int argc, char **argv)
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| 117 | {
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| 118 | if (argc < 3) {
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| 119 | bb_show_usage();
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| 120 | bb_fflush_stdout_and_exit(1);
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| 121 | }
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| 122 |
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| 123 | if (!strcmp(argv[1], "shm")) {
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| 124 | if (remove_ids(SHM, argc-2, &argv[2]))
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| 125 | bb_fflush_stdout_and_exit(1);
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| 126 | }
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| 127 | else if (!strcmp(argv[1], "msg")) {
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| 128 | if (remove_ids(MSG, argc-2, &argv[2]))
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| 129 | bb_fflush_stdout_and_exit(1);
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| 130 | }
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| 131 | else if (!strcmp(argv[1], "sem")) {
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| 132 | if (remove_ids(SEM, argc-2, &argv[2]))
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| 133 | bb_fflush_stdout_and_exit(1);
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| 134 | }
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| 135 | else {
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| 136 | bb_printf ("unknown resource type: %s\n", argv[1]);
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| 137 | bb_show_usage();
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| 138 | bb_fflush_stdout_and_exit(1);
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| 139 | }
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| 140 |
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| 141 | bb_printf ("resource(s) deleted\n");
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| 142 | return 0;
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| 143 | }
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| 144 |
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| 145 |
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| 146 | int ipcrm_main(int argc, char **argv)
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| 147 | {
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| 148 | int c;
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| 149 | int error = 0;
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| 150 | char *prog = argv[0];
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| 151 |
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| 152 | /* if the command is executed without parameters, do nothing */
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| 153 | if (argc == 1)
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| 154 | return 0;
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| 155 |
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| 156 | /* check to see if the command is being invoked in the old way if so
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| 157 | then run the old code */
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| 158 | if (strcmp(argv[1], "shm") == 0 ||
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| 159 | strcmp(argv[1], "msg") == 0 ||
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| 160 | strcmp(argv[1], "sem") == 0)
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| 161 | return deprecated_main(argc, argv);
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| 162 |
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| 163 | /* process new syntax to conform with SYSV ipcrm */
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| 164 | while ((c = getopt(argc, argv, "q:m:s:Q:M:S:h?")) != -1) {
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| 165 | int result;
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| 166 | int id = 0;
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| 167 | int iskey = isupper(c);
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| 168 |
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| 169 | /* needed to delete semaphores */
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| 170 | union semun arg;
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| 171 | arg.val = 0;
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| 172 |
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| 173 | if ((c == '?') || (c == 'h'))
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| 174 | {
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| 175 | bb_show_usage();
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| 176 | return 0;
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| 177 | }
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| 178 |
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| 179 | /* we don't need case information any more */
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| 180 | c = tolower(c);
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| 181 |
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| 182 | /* make sure the option is in range */
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| 183 | if (c != 'q' && c != 'm' && c != 's') {
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| 184 | bb_show_usage();
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| 185 | error++;
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| 186 | return error;
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| 187 | }
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| 188 |
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| 189 | if (iskey) {
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| 190 | /* keys are in hex or decimal */
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| 191 | key_t key = strtoul(optarg, NULL, 0);
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| 192 | if (key == IPC_PRIVATE) {
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| 193 | error++;
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| 194 | bb_fprintf(stderr, "%s: illegal key (%s)\n",
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| 195 | prog, optarg);
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| 196 | continue;
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| 197 | }
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| 198 |
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| 199 | /* convert key to id */
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| 200 | id = ((c == 'q') ? msgget(key, 0) :
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| 201 | (c == 'm') ? shmget(key, 0, 0) :
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| 202 | semget(key, 0, 0));
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| 203 |
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| 204 | if (id < 0) {
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| 205 | char *errmsg;
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| 206 | error++;
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| 207 | switch(errno) {
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| 208 | case EACCES:
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| 209 | errmsg = "permission denied for key";
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| 210 | break;
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| 211 | case EIDRM:
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| 212 | errmsg = "already removed key";
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| 213 | break;
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| 214 | case ENOENT:
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| 215 | errmsg = "invalid key";
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| 216 | break;
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| 217 | default:
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| 218 | errmsg = "unknown error in key";
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| 219 | break;
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| 220 | }
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| 221 | bb_fprintf(stderr, "%s: %s (%s)\n",
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| 222 | prog, errmsg, optarg);
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| 223 | continue;
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| 224 | }
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| 225 | } else {
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| 226 | /* ids are in decimal */
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| 227 | id = strtoul(optarg, NULL, 10);
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| 228 | }
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| 229 |
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| 230 | result = ((c == 'q') ? msgctl(id, IPC_RMID, NULL) :
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| 231 | (c == 'm') ? shmctl(id, IPC_RMID, NULL) :
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| 232 | semctl(id, 0, IPC_RMID, arg));
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| 233 |
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| 234 | if (result < 0) {
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| 235 | char *errmsg;
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| 236 | error++;
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| 237 | switch(errno) {
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| 238 | case EACCES:
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| 239 | case EPERM:
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| 240 | errmsg = iskey
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| 241 | ? "permission denied for key"
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| 242 | : "permission denied for id";
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| 243 | break;
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| 244 | case EINVAL:
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| 245 | errmsg = iskey
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| 246 | ? "invalid key"
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| 247 | : "invalid id";
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| 248 | break;
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| 249 | case EIDRM:
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| 250 | errmsg = iskey
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| 251 | ? "already removed key"
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| 252 | : "already removed id";
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| 253 | break;
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| 254 | default:
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| 255 | errmsg = iskey
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| 256 | ? "unknown error in key"
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| 257 | : "unknown error in id";
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| 258 | break;
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| 259 | }
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| 260 | bb_fprintf(stderr, "%s: %s (%s)\n",
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| 261 | prog, errmsg, optarg);
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| 262 | continue;
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| 263 | }
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| 264 | }
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| 265 |
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| 266 | /* print usage if we still have some arguments left over */
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| 267 | if (optind != argc) {
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| 268 | bb_show_usage();
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| 269 | }
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| 270 |
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| 271 | /* exit value reflects the number of errors encountered */
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| 272 | return error;
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| 273 | }
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