1 /* vi: set sw=4 ts=4: */
3 * ipcrm.c - utility to allow removal of IPC objects and data structures.
5 * 01 Sept 2004 - Rodney Radford <rradford@mindspring.com>
6 * Adapted for busybox from util-linux-2.12a.
8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
11 //usage:#define ipcrm_trivial_usage
12 //usage: "[-MQS key] [-mqs id]"
13 //usage:#define ipcrm_full_usage "\n\n"
14 //usage: "Upper-case options MQS remove an object by shmkey value.\n"
15 //usage: "Lower-case options remove an object by shmid value.\n"
16 //usage: "\n -mM Remove memory segment after last detach"
17 //usage: "\n -qQ Remove message queue"
18 //usage: "\n -sS Remove semaphore"
22 /* X/OPEN tells us to use <sys/{types,ipc,sem}.h> for semctl() */
23 /* X/OPEN tells us to use <sys/{types,ipc,msg}.h> for msgctl() */
29 #if defined(__GNU_LIBRARY__) && !defined(_SEM_SEMUN_UNDEFINED)
30 /* union semun is defined by including <sys/sem.h> */
32 /* according to X/OPEN we have to define it ourselves */
36 unsigned short *array
;
37 struct seminfo
*__buf
;
41 #define IPCRM_LEGACY 1
46 typedef enum type_id
{
52 static int remove_ids(type_id type
, char **argv
)
61 id
= bb_strtoul(argv
[0], NULL
, 10);
62 if (errno
|| id
> INT_MAX
) {
63 bb_error_msg("invalid id: %s", argv
[0]);
68 ret
= semctl(id
, 0, IPC_RMID
, arg
);
70 ret
= msgctl(id
, IPC_RMID
, NULL
);
72 ret
= shmctl(id
, IPC_RMID
, NULL
);
75 bb_perror_msg("can't remove id %s", argv
[0]);
84 #endif /* IPCRM_LEGACY */
87 int ipcrm_main(int argc
, char **argv
) MAIN_EXTERNALLY_VISIBLE
;
88 int ipcrm_main(int argc
, char **argv
)
93 /* if the command is executed without parameters, do nothing */
97 /* check to see if the command is being invoked in the old way if so
98 then run the old code. Valid commands are msg, shm, sem. */
100 type_id what
= 0; /* silence gcc */
104 if ( ((w
== 'm' && argv
[1][1] == 's' && argv
[1][2] == 'g')
105 || (argv
[1][0] == 's'
106 && ((w
= argv
[1][1]) == 'h' || w
== 'e')
107 && argv
[1][2] == 'm')
108 ) && argv
[1][3] == '\0'
120 if (remove_ids(what
, &argv
[2]))
121 fflush_stdout_and_exit(EXIT_FAILURE
);
122 printf("resource(s) deleted\n");
126 #endif /* IPCRM_LEGACY */
128 /* process new syntax to conform with SYSV ipcrm */
129 while ((c
= getopt(argc
, argv
, "q:m:s:Q:M:S:h?")) != -1) {
132 int iskey
= isupper(c
);
134 /* needed to delete semaphores */
139 if ((c
== '?') || (c
== 'h')) {
143 /* we don't need case information any more */
146 /* make sure the option is in range: allowed are q, m, s */
147 if (c
!= 'q' && c
!= 'm' && c
!= 's') {
152 /* keys are in hex or decimal */
153 key_t key
= xstrtoul(optarg
, 0);
155 if (key
== IPC_PRIVATE
) {
157 bb_error_msg("illegal key (%s)", optarg
);
161 /* convert key to id */
162 id
= ((c
== 'q') ? msgget(key
, 0) :
163 (c
== 'm') ? shmget(key
, 0, 0) : semget(key
, 0, 0));
171 errmsg
= "permission denied for";
174 errmsg
= "already removed";
180 errmsg
= "unknown error in";
183 bb_error_msg("%s %s (%s)", errmsg
, "key", optarg
);
187 /* ids are in decimal */
191 result
= ((c
== 'q') ? msgctl(id
, IPC_RMID
, NULL
) :
192 (c
== 'm') ? shmctl(id
, IPC_RMID
, NULL
) :
193 semctl(id
, 0, IPC_RMID
, arg
));
197 const char *const what
= iskey
? "key" : "id";
203 errmsg
= "permission denied for";
209 errmsg
= "already removed";
212 errmsg
= "unknown error in";
215 bb_error_msg("%s %s (%s)", errmsg
, what
, optarg
);
220 /* print usage if we still have some arguments left over */
221 if (optind
!= argc
) {
225 /* exit value reflects the number of errors encountered */