busybox/util-linux/ipcrm.c

/* vi: set sw=4 ts=4: */
/*
 * ipcrm.c - utility to allow removal of IPC objects and data structures.
 *
 * 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
 * Adapted for busybox from util-linux-2.12a.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 */

#include "busybox.h"

/* X/OPEN tells us to use <sys/{types,ipc,sem}.h> for semctl() */
/* X/OPEN tells us to use <sys/{types,ipc,msg}.h> for msgctl() */
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/msg.h>
#include <sys/sem.h>

#if defined (__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
/* union semun is defined by including <sys/sem.h> */
#else
/* according to X/OPEN we have to define it ourselves */
union semun {
	int val;
	struct semid_ds *buf;
	unsigned short int *array;
	struct seminfo *__buf;
};
#endif

#ifndef CONFIG_IPCRM_DROP_LEGACY

typedef enum type_id {
	SHM,
	SEM,
	MSG
} type_id;

static int remove_ids(type_id type, int argc, char **argv)
{
	unsigned long id;
	int ret = 0;		/* silence gcc */
	int nb_errors = 0;
	union semun arg;

	arg.val = 0;

	while (argc) {
		id = bb_strtoul(argv[0], NULL, 10);
		if (errno || id > INT_MAX) {
			bb_error_msg("invalid id: %s", argv[0]);
			nb_errors++;
		} else {
			if (type == SEM)
				ret = semctl(id, 0, IPC_RMID, arg);
			else if (type == MSG)
				ret = msgctl(id, IPC_RMID, NULL);
			else if (type ==  SHM)
				ret = shmctl(id, IPC_RMID, NULL);

			if (ret) {
				bb_perror_msg("cannot remove id %s", argv[0]);
				nb_errors++;
			}
		}
		argc--;
		argv++;
	}

	return nb_errors;
}
#endif /* #ifndef CONFIG_IPCRM_DROP_LEGACY */


int ipcrm_main(int argc, char **argv)
{
	int c;
	int error = 0;

	/* if the command is executed without parameters, do nothing */
	if (argc == 1)
		return 0;
#ifndef CONFIG_IPCRM_DROP_LEGACY
	/* check to see if the command is being invoked in the old way if so
	   then run the old code. Valid commands are msg, shm, sem. */
	{
		type_id what = 0; /* silence gcc */
		char w;

		w=argv[1][0];
		if ( ((w == 'm' && argv[1][1] == 's' && argv[1][2] == 'g')
		       || (argv[1][0] == 's'
		           && ((w=argv[1][1]) == 'h' || w == 'e')
		           && argv[1][2] == 'm')
		     ) && argv[1][3] == '\0'
		) {

			if (argc < 3)
				bb_show_usage();

			if (w == 'h')
				what = SHM;
			else if (w == 'm')
				what = MSG;
			else if (w == 'e')
				what = SEM;

			if (remove_ids(what, argc-2, &argv[2]))
				fflush_stdout_and_exit(1);
			printf("resource(s) deleted\n");
			return 0;
		}
	}
#endif /* #ifndef CONFIG_IPCRM_DROP_LEGACY */

	/* process new syntax to conform with SYSV ipcrm */
	while ((c = getopt(argc, argv, "q:m:s:Q:M:S:h?")) != -1) {
		int result;
		int id = 0;
		int iskey = (isupper)(c);

		/* needed to delete semaphores */
		union semun arg;

		arg.val = 0;

		if ((c == '?') || (c == 'h')) {
			bb_show_usage();
		}

		/* we don't need case information any more */
		c = tolower(c);

		/* make sure the option is in range: allowed are q, m, s */
		if (c != 'q' && c != 'm' && c != 's') {
			bb_show_usage();
		}

		if (iskey) {
			/* keys are in hex or decimal */
			key_t key = xstrtoul(optarg, 0);

			if (key == IPC_PRIVATE) {
				error++;
				bb_error_msg("illegal key (%s)", optarg);
				continue;
			}

			/* convert key to id */
			id = ((c == 'q') ? msgget(key, 0) :
				  (c == 'm') ? shmget(key, 0, 0) : semget(key, 0, 0));

			if (id < 0) {
				char *errmsg;
				const char * const what = "key";

				error++;
				switch (errno) {
				case EACCES:
					errmsg = "permission denied for";
					break;
				case EIDRM:
					errmsg = "already removed";
					break;
				case ENOENT:
					errmsg = "invalid";
					break;
				default:
					errmsg = "unknown error in";
					break;
				}
				bb_error_msg("%s %s (%s)",  errmsg, what, optarg);
				continue;
			}
		} else {
			/* ids are in decimal */
			id = xatoul(optarg);
		}

		result = ((c == 'q') ? msgctl(id, IPC_RMID, NULL) :
				  (c == 'm') ? shmctl(id, IPC_RMID, NULL) :
				  semctl(id, 0, IPC_RMID, arg));

		if (result) {
			char *errmsg;
			const char * const what = iskey ? "key" : "id";

			error++;
			switch (errno) {
			case EACCES:
			case EPERM:
				errmsg = "permission denied for";
				break;
			case EINVAL:
				errmsg = "invalid";
				break;
			case EIDRM:
				errmsg = "already removed";
				break;
			default:
				errmsg = "unknown error in";
				break;
			}
			bb_error_msg("%s %s (%s)", errmsg, what, optarg);
			continue;
		}
	}

	/* print usage if we still have some arguments left over */
	if (optind != argc) {
		bb_show_usage();
	}

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