aboutsummaryrefslogtreecommitdiff
path: root/util-linux/ipcrm.c
diff options
context:
space:
mode:
Diffstat (limited to 'util-linux/ipcrm.c')
-rw-r--r--util-linux/ipcrm.c217
1 files changed, 217 insertions, 0 deletions
diff --git a/util-linux/ipcrm.c b/util-linux/ipcrm.c
new file mode 100644
index 000000000..507e58fe3
--- /dev/null
+++ b/util-linux/ipcrm.c
@@ -0,0 +1,217 @@
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 */
24union 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
34typedef enum type_id {
35 SHM,
36 SEM,
37 MSG
38} type_id;
39
40static 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
76int 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}
generated by cgit v1.2.3-55-g6feb (git 2.39.1) at 2025-08-14 11:25:41 +0000