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218 lines
4.5 KiB
C
218 lines
4.5 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* ipcrm.c - utility to allow removal of IPC objects and data structures.
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*
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* 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
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* Adapted for busybox from util-linux-2.12a.
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*
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* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
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*/
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#include "busybox.h"
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/* X/OPEN tells us to use <sys/{types,ipc,sem}.h> for semctl() */
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/* X/OPEN tells us to use <sys/{types,ipc,msg}.h> for msgctl() */
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#include <sys/msg.h>
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#include <sys/sem.h>
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#if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
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/* union semun is defined by including <sys/sem.h> */
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#else
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/* according to X/OPEN we have to define it ourselves */
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union semun {
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int val;
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struct semid_ds *buf;
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unsigned short int *array;
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struct seminfo *__buf;
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};
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#endif
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#ifndef CONFIG_IPCRM_DROP_LEGACY
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typedef enum type_id {
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SHM,
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SEM,
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MSG
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} type_id;
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static int remove_ids(type_id type, int argc, char **argv)
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{
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unsigned long id;
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int ret = 0; /* silence gcc */
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int nb_errors = 0;
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union semun arg;
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arg.val = 0;
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while (argc) {
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id = bb_strtoul(argv[0], NULL, 10);
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if (errno || id > INT_MAX) {
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bb_error_msg("invalid id: %s", argv[0]);
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nb_errors++;
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} else {
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if (type == SEM)
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ret = semctl(id, 0, IPC_RMID, arg);
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else if (type == MSG)
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ret = msgctl(id, IPC_RMID, NULL);
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else if (type == SHM)
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ret = shmctl(id, IPC_RMID, NULL);
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if (ret) {
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bb_perror_msg("cannot remove id %s", argv[0]);
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nb_errors++;
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}
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}
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argc--;
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argv++;
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}
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return nb_errors;
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}
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#endif /* #ifndef CONFIG_IPCRM_DROP_LEGACY */
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int ipcrm_main(int argc, char **argv);
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int ipcrm_main(int argc, char **argv)
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{
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int c;
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int error = 0;
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/* if the command is executed without parameters, do nothing */
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if (argc == 1)
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return 0;
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#ifndef CONFIG_IPCRM_DROP_LEGACY
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/* check to see if the command is being invoked in the old way if so
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then run the old code. Valid commands are msg, shm, sem. */
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{
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type_id what = 0; /* silence gcc */
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char w;
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w=argv[1][0];
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if ( ((w == 'm' && argv[1][1] == 's' && argv[1][2] == 'g')
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|| (argv[1][0] == 's'
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&& ((w=argv[1][1]) == 'h' || w == 'e')
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&& argv[1][2] == 'm')
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) && argv[1][3] == '\0'
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) {
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if (argc < 3)
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bb_show_usage();
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if (w == 'h')
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what = SHM;
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else if (w == 'm')
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what = MSG;
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else if (w == 'e')
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what = SEM;
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if (remove_ids(what, argc-2, &argv[2]))
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fflush_stdout_and_exit(1);
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printf("resource(s) deleted\n");
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return 0;
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}
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}
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#endif /* #ifndef CONFIG_IPCRM_DROP_LEGACY */
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/* process new syntax to conform with SYSV ipcrm */
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while ((c = getopt(argc, argv, "q:m:s:Q:M:S:h?")) != -1) {
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int result;
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int id = 0;
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int iskey = (isupper)(c);
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/* needed to delete semaphores */
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union semun arg;
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arg.val = 0;
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if ((c == '?') || (c == 'h')) {
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bb_show_usage();
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}
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/* we don't need case information any more */
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c = tolower(c);
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/* make sure the option is in range: allowed are q, m, s */
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if (c != 'q' && c != 'm' && c != 's') {
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bb_show_usage();
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}
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if (iskey) {
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/* keys are in hex or decimal */
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key_t key = xstrtoul(optarg, 0);
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if (key == IPC_PRIVATE) {
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error++;
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bb_error_msg("illegal key (%s)", optarg);
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continue;
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}
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/* convert key to id */
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id = ((c == 'q') ? msgget(key, 0) :
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(c == 'm') ? shmget(key, 0, 0) : semget(key, 0, 0));
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if (id < 0) {
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const char *errmsg;
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error++;
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switch (errno) {
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case EACCES:
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errmsg = "permission denied for";
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break;
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case EIDRM:
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errmsg = "already removed";
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break;
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case ENOENT:
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errmsg = "invalid";
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break;
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default:
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errmsg = "unknown error in";
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break;
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}
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bb_error_msg("%s %s (%s)", errmsg, "key", optarg);
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continue;
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}
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} else {
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/* ids are in decimal */
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id = xatoul(optarg);
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}
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result = ((c == 'q') ? msgctl(id, IPC_RMID, NULL) :
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(c == 'm') ? shmctl(id, IPC_RMID, NULL) :
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semctl(id, 0, IPC_RMID, arg));
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if (result) {
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const char *errmsg;
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const char *const what = iskey ? "key" : "id";
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error++;
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switch (errno) {
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case EACCES:
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case EPERM:
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errmsg = "permission denied for";
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break;
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case EINVAL:
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errmsg = "invalid";
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break;
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case EIDRM:
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errmsg = "already removed";
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break;
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default:
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errmsg = "unknown error in";
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break;
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}
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bb_error_msg("%s %s (%s)", errmsg, what, optarg);
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continue;
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}
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}
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/* print usage if we still have some arguments left over */
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if (optind != argc) {
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bb_show_usage();
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}
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/* exit value reflects the number of errors encountered */
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return error;
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}
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