1 /* ipcs.c - provide information on ipc facilities
2 *
3 * Copyright 2014 Sandeep Sharma <sandeep.jack2756@gmail.com>
4 *
5 * see http://pubs.opengroup.org/onlinepubs/9699919799/utilities/ipcs.html
6
7 USE_IPCS(NEWTOY(ipcs, "acptulsqmi#", TOYFLAG_USR|TOYFLAG_BIN))
8
9 config IPCS
10 bool "ipcs"
11 default n
12 help
13 usage: ipcs [[-smq] -i shmid] | [[-asmq] [-tcplu]]
14
15 -i Show specific resource
16 Resource specification:
17 -a All (default)
18 -m Shared memory segments
19 -q Message queues
20 -s Semaphore arrays
21 Output format:
22 -c Creator
23 -l Limits
24 -p Pid
25 -t Time
26 -u Summary
27 */
28
29 #define FOR_ipcs
30 #include "toys.h"
31 #include <sys/ipc.h>
32 #include <sys/shm.h>
33 #include <sys/sem.h>
34 #include <sys/msg.h>
35
36 GLOBALS(
37 int id;
38 )
39
40 //used many times, so good to paste it
41 #define flag(x) (toys.optflags & FLAG_ ## x)
42
43 union semun { //man says declare it yourself
44 int val;
45 struct semid_ds *buf;
46 unsigned short *array;
47 struct seminfo *__buf;
48 };
49
show_msg_id(void)50 static void show_msg_id(void)
51 {
52 struct msqid_ds buf;
53 int ret;
54
55 if ((ret = msgctl(TT.id, IPC_STAT, &buf)) < 0) {
56 perror_msg("msgctl");
57 return;
58 }
59
60 #define ipcperm buf.msg_perm
61
62 printf("\nMessage Queue msqid=%d\n"
63 "uid=%d\tgid=%d\tcuid=%d\tcgid=%d\tmode=%#o\n",
64 TT.id, ipcperm.uid, ipcperm.gid, ipcperm.cuid, ipcperm.cgid,ipcperm.mode);
65 printf ("cbytes=%ld\tqbytes=%ld\tqnum=%ld\tlspid=%d\tlrpid=%d\n",
66 (long) buf.msg_cbytes, (long) buf.msg_qbytes,
67 (long) buf.msg_qnum, buf.msg_lspid, buf.msg_lrpid);
68
69 printf("send_time=%-26.24s\nrcv_time=%-26.24s\nchange_time=%-26.24s\n\n",
70 buf.msg_stime ? ctime(&buf.msg_stime) : "Not set",
71 buf.msg_rtime ? ctime(&buf.msg_rtime) : "Not set",
72 buf.msg_ctime ? ctime(&buf.msg_ctime) : "Not set");
73 #undef ipcperm
74 }
75
show_sem_id(void)76 static void show_sem_id(void)
77 {
78 struct semid_ds buf;
79 union semun n;
80 int ret, i;
81
82 n.buf = &buf;
83 if ((ret = semctl(TT.id, 0, IPC_STAT, n)) < 0) {
84 perror_msg("semctl");
85 return;
86 }
87
88 #define ipcperm buf.sem_perm
89 printf("\nSemaphore Array semid=%d\n"
90 "uid=%d\t gid=%d\t cuid=%d\t cgid=%d\n"
91 "mode=%#o, access_perms=%#o\n"
92 "nsems = %ld\n"
93 "otime = %-26.24s\n",
94 TT.id,
95 ipcperm.uid, ipcperm.gid, ipcperm.cuid, ipcperm.cgid,
96 ipcperm.mode, ipcperm.mode & 0777,
97 (long) buf.sem_nsems,
98 buf.sem_otime ? ctime(&buf.sem_otime) : "Not set");
99 printf("ctime = %-26.24s\n"
100 "%-10s %-10s %-10s %-10s %-10s\n",
101 ctime(&buf.sem_ctime),
102 "semnum", "value", "ncount", "zcount", "pid");
103 #undef ipcperm
104
105 for (i = 0; i < buf.sem_nsems; i++) {
106 int val, nc, zc, pid;
107 val = semctl(TT.id, i, GETVAL, n);
108 nc = semctl(TT.id, i, GETNCNT, n);
109 zc = semctl(TT.id, i, GETZCNT, n);
110 pid = semctl(TT.id, i, GETPID, n);
111 if (val < 0 || nc < 0 || zc < 0 || pid < 0)
112 perror_exit("semctl");
113 printf("%-10d %-10d %-10d %-10d %-10d\n", i, val, nc, zc, pid);
114 }
115 xputc('\n');
116 }
117
show_shm_id(void)118 static void show_shm_id(void)
119 {
120 struct shmid_ds buf;
121 int ret;
122
123 if ((ret = shmctl(TT.id, IPC_STAT, &buf)) < 0) {
124 perror_msg("shmctl");
125 return;
126 }
127
128 #define ipcperm buf.shm_perm
129
130 printf("\nShared memory Segment shmid=%d\n"
131 "uid=%d\tgid=%d\tcuid=%d\tcgid=%d\n"
132 "mode=%#o\taccess_perms=%#o\n"
133 "bytes=%ld\tlpid=%d\tcpid=%d\tnattch=%ld\n",
134 TT.id,
135 ipcperm.uid, ipcperm.gid, ipcperm.cuid, ipcperm.cgid,
136 ipcperm.mode, (ipcperm.mode & 0777),
137 (long) buf.shm_segsz, buf.shm_lpid, buf.shm_cpid,
138 (long) buf.shm_nattch);
139 printf("att_time=%-26.24s\n",
140 buf.shm_atime ? ctime(&buf.shm_atime) : "Not set");
141 printf("det_time=%-26.24s\n",
142 buf.shm_dtime ? ctime(&buf.shm_dtime) : "Not set");
143 printf("change_time=%-26.24s\n\n", ctime(&buf.shm_ctime));
144 #undef ipcperm
145 }
146
shm_array(void)147 static void shm_array(void)
148 {
149 struct shm_info shm_buf;
150 struct shminfo ipc_buf;
151 struct shmid_ds buf;
152 int max_nr, i, shmid;
153 struct passwd *pw;
154 struct group *gr;
155
156 if ((max_nr = shmctl(0, SHM_INFO, (struct shmid_ds*)&shm_buf)) < 0) {
157 perror_msg("kernel not configured for shared memory");
158 return;
159 }
160
161 if (flag(u)) {
162 printf("------ Shared Memory Status --------\n");
163 printf("segments allocated %d\n"
164 "pages allocated %ld\n"
165 "pages resident %ld\n"
166 "pages swapped %ld\n"
167 "Swap performance: %ld attempts\t%ld successes\n",
168 shm_buf.used_ids,
169 shm_buf.shm_tot,
170 shm_buf.shm_rss,
171 shm_buf.shm_swp,
172 shm_buf.swap_attempts, shm_buf.swap_successes);
173 return;
174 }
175 if (flag(l)) {
176 if ((shmctl(0, 3, (struct shmid_ds*)&ipc_buf)) < 0) return; //IPC_INFO
177 printf("------ Shared Memory Limits --------\n");
178 printf("max number of segments = %lu\n"
179 "max seg size (kbytes) = %lu\n"
180 "max total shared memory (pages) = %lu\n"
181 "min seg size (bytes) = %lu\n",
182 (unsigned long) ipc_buf.shmmni,
183 (unsigned long) (ipc_buf.shmmax >> 10),
184 (unsigned long) ipc_buf.shmall,
185 (unsigned long) ipc_buf.shmmin);
186 return;
187 }
188
189 if (flag(t)) {
190 printf("------ Shared Memory Attach/Detach/Change Times --------\n");
191 printf("%-10s %-10s %-20s %-20s %-20s\n",
192 "shmid", "owner", "attached", "detached", "changed");
193 } else if (flag(p)) {
194 printf("------ Shared Memory Creator/Last-op --------\n");
195 printf("%-10s %-10s %-10s %-10s\n",
196 "shmid", "owner", "cpid", "lpid");
197 } else if (flag(c)) {
198 printf("------ Shared Memory Segment Creators/Owners --------\n");
199 printf("%-10s %-10s %-10s %-10s %-10s %-10s\n",
200 "shmid", "perms", "cuid", "cgid", "uid", "gid");
201 } else {
202 printf("------ Shared Memory Segments --------\n");
203 printf("%-10s %-10s %-10s %-10s %-10s %-10s %-12s\n",
204 "key", "shmid", "owner", "perms", "bytes", "nattch",
205 "status");
206 }
207
208 for (i = 0; i <= max_nr; i++) {
209 if ((shmid = shmctl(i, SHM_STAT, &buf)) < 0 ) continue;
210 if (flag(t)) {
211 if ((pw = getpwuid(buf.shm_perm.uid)))
212 printf("%-10d %-10.10s", shmid, pw->pw_name);
213 else printf("%-10d %-10.10d", shmid, buf.shm_perm.uid);
214 printf(" %-20.16s", buf.shm_atime
215 ? ctime(&buf.shm_atime) + 4 : "Not set");
216 printf(" %-20.16s", buf.shm_dtime
217 ? ctime(&buf.shm_dtime) + 4 : "Not set");
218 printf(" %-20.16s\n", buf.shm_ctime
219 ? ctime(&buf.shm_ctime) + 4 : "Not set");
220 } else if (flag(p)) {
221 if ((pw = getpwuid(buf.shm_perm.uid)))
222 printf("%-10d %-10.10s", shmid, pw->pw_name);
223 else printf("%-10d %-10.10d", shmid, buf.shm_perm.uid);
224 printf(" %-10d %-10d\n", buf.shm_cpid, buf.shm_lpid);
225 } else if (flag(c)) {
226 printf("%-10d %-10o", shmid, buf.shm_perm.mode & 0777);
227 if ((pw = getpwuid(buf.shm_perm.cuid))) printf(" %-10s", pw->pw_name);
228 else printf(" %-10d", buf.shm_perm.cuid);
229 if ((gr = getgrgid(buf.shm_perm.cgid))) printf(" %-10s", gr->gr_name);
230 else printf(" %-10d", buf.shm_perm.cgid);
231 if ((pw = getpwuid(buf.shm_perm.uid))) printf(" %-10s", pw->pw_name);
232 else printf(" %-10d", buf.shm_perm.uid);
233 if ((gr = getgrgid(buf.shm_perm.gid))) printf(" %-10s\n", gr->gr_name);
234 else printf(" %-10d\n", buf.shm_perm.gid);
235 } else {
236 printf("0x%08x ", buf.shm_perm.__key);
237 if ((pw = getpwuid(buf.shm_perm.uid)))
238 printf("%-10d %-10.10s", shmid, pw->pw_name);
239 else printf("%-10d %-10.10d", shmid, buf.shm_perm.uid);
240 printf(" %-10o %-10lu %-10ld %-6s %-6s\n", buf.shm_perm.mode & 0777,
241 (unsigned long) buf.shm_segsz,
242 (long) buf.shm_nattch,
243 buf.shm_perm.mode & SHM_DEST ? "dest" : " ",
244 buf.shm_perm.mode & SHM_LOCKED ? "locked" : " ");
245 }
246 }
247 }
248
sem_array(void)249 static void sem_array(void)
250 {
251 struct seminfo info_buf;
252 struct semid_ds buf;
253 union semun u;
254 int max_nr, i,semid;
255 struct passwd *pw;
256 struct group *gr;
257
258 u.array = (unsigned short *)&info_buf;
259 if ((max_nr = semctl(0, 0, SEM_INFO, u)) < 0) {
260 perror_msg("kernel is not configured for semaphores");
261 return;
262 }
263
264
265 if (flag(u)) {
266 printf("------ Semaphore Status --------\n");
267 printf("used arrays = %d\n"
268 "allocated semaphores = %d\n",
269 info_buf.semusz, info_buf.semaem);
270 return;
271 }
272 if (flag(l)) {
273 printf("------ Semaphore Limits --------\n");
274 u.array = (unsigned short *)&info_buf;
275 if ((semctl(0, 0, 3, u)) < 0) //IPC_INFO
276 return;
277 printf("max number of arrays = %d\n"
278 "max semaphores per array = %d\n"
279 "max semaphores system wide = %d\n"
280 "max ops per semop call = %d\n"
281 "semaphore max value = %d\n",
282 info_buf.semmni,
283 info_buf.semmsl,
284 info_buf.semmns, info_buf.semopm, info_buf.semvmx);
285 return;
286 }
287
288 if (flag(t)) {
289 printf("------ Semaphore Operation/Change Times --------\n");
290 printf("%-8s %-10s %-26.24s %-26.24s\n",
291 "shmid", "owner", "last-op", "last-changed");
292 } else if (flag(c)) {
293 printf("------ Semaphore %s --------\n", "Arrays Creators/Owners");
294 printf("%-10s %-10s %-10s %-10s %-10s %-10s\n",
295 "semid", "perms", "cuid", "cgid", "uid", "gid");
296
297 } else if (flag(p)){
298 return;
299 } else {
300 printf("------ Semaphore %s --------\n", "Arrays");
301 printf("%-10s %-10s %-10s %-10s %-10s\n",
302 "key", "semid", "owner", "perms", "nsems");
303 }
304
305 for (i = 0; i <= max_nr; i++) {
306 u.buf = &buf;
307 if ((semid = semctl(i, 0, SEM_STAT, u)) < 0) continue;
308 pw = getpwuid(buf.sem_perm.uid);
309 if (flag(t)) {
310 if (pw) printf("%-8d %-10.10s", semid, pw->pw_name);
311 else printf("%-8d %-10d", semid, buf.sem_perm.uid);
312
313 printf(" %-26.24s", buf.sem_otime
314 ? ctime(&buf.sem_otime) : "Not set");
315 printf(" %-26.24s\n", buf.sem_ctime
316 ? ctime(&buf.sem_ctime) : "Not set");
317 } else if (flag(c)) {
318 printf("%-10d %-10o", semid, buf.sem_perm.mode & 0777);
319 if ((pw = getpwuid(buf.sem_perm.cuid))) printf(" %-10s", pw->pw_name);
320 else printf(" %-10d", buf.sem_perm.cuid);
321 if ((gr = getgrgid(buf.sem_perm.cgid))) printf(" %-10s", gr->gr_name);
322 else printf(" %-10d", buf.sem_perm.cgid);
323 if ((pw = getpwuid(buf.sem_perm.uid))) printf(" %-10s", pw->pw_name);
324 else printf(" %-10d", buf.sem_perm.uid);
325 if ((gr = getgrgid(buf.sem_perm.gid))) printf(" %-10s\n", gr->gr_name);
326 else printf(" %-10d\n", buf.sem_perm.gid);
327 } else {
328 printf("0x%08x ", buf.sem_perm.__key);
329 if (pw) printf("%-10d %-10.9s", semid, pw->pw_name);
330 else printf("%-10d %-9d", semid, buf.sem_perm.uid);
331 printf(" %-10o %-10ld\n", buf.sem_perm.mode & 0777,
332 (long) buf.sem_nsems);
333 }
334 }
335 }
336
msg_array(void)337 static void msg_array(void)
338 {
339 struct msginfo info_buf;
340 struct msqid_ds buf;
341 int max_nr, i, msqid;
342 struct passwd *pw;
343 struct group *gr;
344
345 if ((max_nr = msgctl(0, MSG_INFO, (struct msqid_ds*)&info_buf)) < 0) {
346 perror_msg("kernel not configured for message queue");
347 return;
348 }
349
350 if (flag(u)) {
351 printf("------ Message%s --------\n", "s: Status");
352 printf("allocated queues = %d\n"
353 "used headers = %d\n"
354 "used space = %d bytes\n",
355 info_buf.msgpool, info_buf.msgmap, info_buf.msgtql);
356 return;
357 }
358 if (flag(l)) {
359 if ((msgctl(0, 3, (struct msqid_ds*)&info_buf)) < 0) return; //IPC_INFO
360 printf("------ Messages: Limits --------\n");
361 printf("max queues system wide = %d\n"
362 "max size of message (bytes) = %d\n"
363 "default max size of queue (bytes) = %d\n",
364 info_buf.msgmni, info_buf.msgmax, info_buf.msgmnb);
365 return;
366 }
367
368 if (flag(t)) {
369 printf("------ Message%s --------\n", " Queues Send/Recv/Change Times");
370 printf("%-8s %-10s %-20s %-20s %-20s\n",
371 "msqid", "owner", "send", "recv", "change");
372 } else if (flag(p)) {
373 printf("------ Message%s --------\n", " Queues PIDs");
374 printf("%-10s %-10s %-10s %-10s\n",
375 "msqid", "owner", "lspid", "lrpid");
376 } else if (flag(c)) {
377 printf("------ Message%s --------\n", " Queues: Creators/Owners");
378 printf("%-10s %-10s %-10s %-10s %-10s %-10s\n",
379 "msqid", "perms", "cuid", "cgid", "uid", "gid");
380 } else {
381 printf("------ Message%s --------\n", " Queues");
382 printf("%-10s %-10s %-10s %-10s %-12s %-12s\n",
383 "key", "msqid", "owner", "perms", "used-bytes", "messages");
384 }
385
386 for (i = 0; i <= max_nr; i++) {
387 if ((msqid = msgctl(i, MSG_STAT, &buf)) < 0 ) continue;
388 pw = getpwuid(buf.msg_perm.uid);
389 if (flag(t)) {
390 if (pw) printf("%-8d %-10.10s", msqid, pw->pw_name);
391 else printf("%-8d %-10d", msqid, buf.msg_perm.uid);
392 printf(" %-20.16s", buf.msg_stime
393 ? ctime(&buf.msg_stime) + 4 : "Not set");
394 printf(" %-20.16s", buf.msg_rtime
395 ? ctime(&buf.msg_rtime) + 4 : "Not set");
396 printf(" %-20.16s\n", buf.msg_ctime
397 ? ctime(&buf.msg_ctime) + 4 : "Not set");
398 } else if (flag(p)) {
399 if (pw) printf("%-8d %-10.10s", msqid, pw->pw_name);
400 else printf("%-8d %-10d", msqid, buf.msg_perm.uid);
401 printf(" %5d %5d\n", buf.msg_lspid, buf.msg_lrpid);
402 } else if (flag(c)) {
403 printf("%-10d %-10o", msqid, buf.msg_perm.mode & 0777);
404 if ((pw = getpwuid(buf.msg_perm.cuid))) printf(" %-10s", pw->pw_name);
405 else printf(" %-10d", buf.msg_perm.cuid);
406 if ((gr = getgrgid(buf.msg_perm.cgid))) printf(" %-10s", gr->gr_name);
407 else printf(" %-10d", buf.msg_perm.cgid);
408 if ((pw = getpwuid(buf.msg_perm.uid))) printf(" %-10s", pw->pw_name);
409 else printf(" %-10d", buf.msg_perm.uid);
410 if ((gr = getgrgid(buf.msg_perm.gid))) printf(" %-10s\n", gr->gr_name);
411 else printf(" %-10d\n", buf.msg_perm.gid);
412 } else {
413 printf("0x%08x ", buf.msg_perm.__key);
414 if (pw) printf("%-10d %-10.10s", msqid, pw->pw_name);
415 else printf("%-10d %-10d", msqid, buf.msg_perm.uid);
416 printf(" %-10o %-12ld %-12ld\n", buf.msg_perm.mode & 0777,
417 (long) buf.msg_cbytes, (long) buf.msg_qnum);
418 }
419 }
420 }
421
ipcs_main(void)422 void ipcs_main(void)
423 {
424 if (flag(i)) {
425 if (flag(m)) show_shm_id();
426 else if (flag(s)) show_sem_id();
427 else if (flag(q)) show_msg_id();
428 else help_exit(0);
429 return;
430 }
431
432 if (!(flag(m) || flag(s) || flag(q)) || flag(a)) toys.optflags |= (FLAG_m|FLAG_s|FLAG_q);
433
434 xputc('\n');
435 if (flag(m)) {
436 shm_array();
437 xputc('\n');
438 }
439 if (flag(s)) {
440 sem_array();
441 xputc('\n');
442 }
443 if (flag(q)) {
444 msg_array();
445 xputc('\n');
446 }
447 }
448