[1770] | 1 | /* vi: set sw=4 ts=4: */
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[821] | 2 | /*
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[1770] | 3 | * ipcrm.c - utility to allow removal of IPC objects and data structures.
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[821] | 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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[1770] | 8 | * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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[821] | 9 | */
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| 10 |
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[1770] | 11 | #include "libbb.h"
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[821] | 12 |
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[1770] | 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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[821] | 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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[1770] | 20 | #if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
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[821] | 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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[1770] | 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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[821] | 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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[1770] | 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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[821] | 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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[1770] | 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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[821] | 57 | } else {
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[1770] | 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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[821] | 64 |
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| 65 | if (ret) {
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[1770] | 66 | bb_perror_msg("cannot remove id %s", argv[0]);
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| 67 | nb_errors++;
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[821] | 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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[1770] | 74 | return nb_errors;
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[821] | 75 | }
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[1770] | 76 | #endif /* IPCRM_LEGACY */
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[821] | 77 |
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| 78 |
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[1770] | 79 | int ipcrm_main(int argc, char **argv);
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[821] | 80 | int ipcrm_main(int argc, char **argv)
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| 81 | {
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[1770] | 82 | int c;
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| 83 | int error = 0;
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[821] | 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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[1770] | 88 | #if IPCRM_LEGACY
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[821] | 89 | /* check to see if the command is being invoked in the old way if so
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[1770] | 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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[821] | 94 |
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[1770] | 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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[821] | 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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[1770] | 125 | int iskey = (isupper)(c);
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[821] | 126 |
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| 127 | /* needed to delete semaphores */
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| 128 | union semun arg;
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[1770] | 129 |
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[821] | 130 | arg.val = 0;
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| 131 |
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[1770] | 132 | if ((c == '?') || (c == 'h')) {
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[821] | 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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[1770] | 139 | /* make sure the option is in range: allowed are q, m, s */
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[821] | 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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[1770] | 146 | key_t key = xstrtoul(optarg, 0);
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| 147 |
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[821] | 148 | if (key == IPC_PRIVATE) {
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| 149 | error++;
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[1770] | 150 | bb_error_msg("illegal key (%s)", optarg);
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[821] | 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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[1770] | 156 | (c == 'm') ? shmget(key, 0, 0) : semget(key, 0, 0));
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[821] | 157 |
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| 158 | if (id < 0) {
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[1770] | 159 | const char *errmsg;
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| 160 |
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[821] | 161 | error++;
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[1770] | 162 | switch (errno) {
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[821] | 163 | case EACCES:
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[1770] | 164 | errmsg = "permission denied for";
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[821] | 165 | break;
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| 166 | case EIDRM:
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[1770] | 167 | errmsg = "already removed";
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[821] | 168 | break;
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| 169 | case ENOENT:
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[1770] | 170 | errmsg = "invalid";
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[821] | 171 | break;
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| 172 | default:
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[1770] | 173 | errmsg = "unknown error in";
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[821] | 174 | break;
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| 175 | }
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[1770] | 176 | bb_error_msg("%s %s (%s)", errmsg, "key", optarg);
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[821] | 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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[1770] | 181 | id = xatoul(optarg);
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[821] | 182 | }
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| 183 |
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| 184 | result = ((c == 'q') ? msgctl(id, IPC_RMID, NULL) :
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[1770] | 185 | (c == 'm') ? shmctl(id, IPC_RMID, NULL) :
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| 186 | semctl(id, 0, IPC_RMID, arg));
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[821] | 187 |
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[1770] | 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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[821] | 192 | error++;
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[1770] | 193 | switch (errno) {
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[821] | 194 | case EACCES:
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| 195 | case EPERM:
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[1770] | 196 | errmsg = "permission denied for";
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[821] | 197 | break;
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| 198 | case EINVAL:
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[1770] | 199 | errmsg = "invalid";
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[821] | 200 | break;
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| 201 | case EIDRM:
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[1770] | 202 | errmsg = "already removed";
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[821] | 203 | break;
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| 204 | default:
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[1770] | 205 | errmsg = "unknown error in";
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[821] | 206 | break;
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| 207 | }
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[1770] | 208 | bb_error_msg("%s %s (%s)", errmsg, what, optarg);
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[821] | 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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