1 /*
2 * Copyright (c) International Business Machines Corp., 2002
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
12 * the GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 *
18 * 06/30/2001 Port to Linux nsharoff@us.ibm.com
19 * 11/06/2002 Port to LTP dbarrera@us.ibm.com
20 */
21
22 /*
23 * Get and manipulate a message queue.
24 * Same as msgctl08 but gets the actual msgmni value under procfs.
25 */
26
27 #define _XOPEN_SOURCE 500
28 #include <signal.h>
29 #include <errno.h>
30 #include <string.h>
31 #include <fcntl.h>
32 #include <stdlib.h>
33 #include <stdio.h>
34 #include <unistd.h>
35 #include <values.h>
36 #include <sys/types.h>
37 #include <sys/wait.h>
38 #include <sys/stat.h>
39 #include <sys/ipc.h>
40 #include <sys/msg.h>
41 #include "test.h"
42 #include "ipcmsg.h"
43 #include "../lib/libmsgctl.h"
44
45 char *TCID = "msgctl10";
46 int TST_TOTAL = 1;
47
48 #define MAXNPROCS 10000 /*These should be sufficient */
49 #define MAXNREPS 10000 /*Else they srewup the system un-necessarily */
50
51 static key_t keyarray[MAXNPROCS];
52 static int pidarray[MAXNPROCS];
53 static int tid;
54 static int MSGMNI, nprocs, nreps;
55 static int procstat;
56 static int mykid;
57
58 void setup(void);
59 void cleanup(void);
60
61 static int dotest(key_t key, int child_process);
62 static void sig_handler(int signo);
63
64 static char *opt_nprocs;
65 static char *opt_nreps;
66
67 static option_t options[] = {
68 {"n:", NULL, &opt_nprocs},
69 {"l:", NULL, &opt_nreps},
70 {NULL, NULL, NULL},
71 };
72
usage(void)73 static void usage(void)
74 {
75 printf(" -n Number of processes\n");
76 printf(" -l Number of iterations\n");
77 }
78
main(int argc,char ** argv)79 int main(int argc, char **argv)
80 {
81 int i, j, ok, pid;
82 int count, status;
83 struct sigaction act;
84
85 tst_parse_opts(argc, argv, options, usage);
86
87 setup();
88
89 nreps = MAXNREPS;
90 nprocs = MSGMNI;
91
92 if (opt_nreps) {
93 nreps = atoi(opt_nreps);
94 if (nreps > MAXNREPS) {
95 tst_resm(TINFO,
96 "Requested number of iterations too large, "
97 "setting to Max. of %d", MAXNREPS);
98 nreps = MAXNREPS;
99 }
100 }
101
102 if (opt_nprocs) {
103 nprocs = atoi(opt_nprocs);
104 if (nprocs > MSGMNI) {
105 tst_resm(TINFO,
106 "Requested number of processes too large, "
107 "setting to Max. of %d", MSGMNI);
108 nprocs = MSGMNI;
109 }
110 }
111
112 srand(getpid());
113 tid = -1;
114
115 /* Setup signal handling routine */
116 memset(&act, 0, sizeof(act));
117 act.sa_handler = sig_handler;
118 sigemptyset(&act.sa_mask);
119 sigaddset(&act.sa_mask, SIGTERM);
120 if (sigaction(SIGTERM, &act, NULL) < 0) {
121 tst_brkm(TFAIL, NULL, "Sigset SIGTERM failed");
122 }
123 /* Set up array of unique keys for use in allocating message
124 * queues
125 */
126 for (i = 0; i < nprocs; i++) {
127 ok = 1;
128 do {
129 /* Get random key */
130 keyarray[i] = (key_t) rand();
131 /* Make sure key is unique and not private */
132 if (keyarray[i] == IPC_PRIVATE) {
133 ok = 0;
134 continue;
135 }
136 for (j = 0; j < i; j++) {
137 if (keyarray[j] == keyarray[i]) {
138 ok = 0;
139 break;
140 }
141 ok = 1;
142 }
143 } while (ok == 0);
144 }
145
146 /* Fork a number of processes, each of which will
147 * create a message queue with one reader/writer
148 * pair which will read and write a number (iterations)
149 * of random length messages with specific values.
150 */
151
152 for (i = 0; i < nprocs; i++) {
153 fflush(stdout);
154 if ((pid = FORK_OR_VFORK()) < 0) {
155 tst_brkm(TFAIL,
156 NULL,
157 "\tFork failed (may be OK if under stress)");
158 }
159 /* Child does this */
160 if (pid == 0) {
161 procstat = 1;
162 exit(dotest(keyarray[i], i));
163 }
164 pidarray[i] = pid;
165 }
166
167 count = 0;
168 while (1) {
169 if ((wait(&status)) > 0) {
170 if (status >> 8 != 0) {
171 tst_brkm(TFAIL, NULL,
172 "Child exit status = %d",
173 status >> 8);
174 }
175 count++;
176 } else {
177 if (errno != EINTR) {
178 break;
179 }
180 #ifdef DEBUG
181 tst_resm(TINFO, "Signal detected during wait");
182 #endif
183 }
184 }
185 /* Make sure proper number of children exited */
186 if (count != nprocs) {
187 tst_brkm(TFAIL,
188 NULL,
189 "Wrong number of children exited, Saw %d, Expected %d",
190 count, nprocs);
191 }
192
193 tst_resm(TPASS, "msgctl10 ran successfully!");
194
195 cleanup();
196 tst_exit();
197 }
198
dotest(key_t key,int child_process)199 static int dotest(key_t key, int child_process)
200 {
201 int id, pid;
202 int ret, status;
203
204 sighold(SIGTERM);
205 TEST(msgget(key, IPC_CREAT | S_IRUSR | S_IWUSR));
206 if (TEST_RETURN < 0) {
207 printf("msgget() error in child %d: %s\n",
208 child_process, strerror(TEST_ERRNO));
209 return FAIL;
210 }
211 tid = id = TEST_RETURN;
212 sigrelse(SIGTERM);
213
214 fflush(stdout);
215 if ((pid = FORK_OR_VFORK()) < 0) {
216 printf("Fork failed (may be OK if under stress)\n");
217 TEST(msgctl(tid, IPC_RMID, 0));
218 if (TEST_RETURN < 0) {
219 printf("msgctl() error in cleanup: %s\n",
220 strerror(TEST_ERRNO));
221 }
222 return FAIL;
223 }
224 if (pid == 0)
225 exit(doreader(key, id, 1, child_process, nreps));
226
227 mykid = pid;
228 procstat = 2;
229 ret = dowriter(key, id, 1, child_process, nreps);
230 wait(&status);
231
232 if (ret != PASS)
233 exit(FAIL);
234
235 if ((!WIFEXITED(status) || (WEXITSTATUS(status) != PASS)))
236 exit(FAIL);
237
238 TEST(msgctl(id, IPC_RMID, 0));
239 if (TEST_RETURN < 0) {
240 printf("msgctl() failed: %s\n",
241 strerror(TEST_ERRNO));
242 return FAIL;
243 }
244 return PASS;
245 }
246
sig_handler(int signo LTP_ATTRIBUTE_UNUSED)247 static void sig_handler(int signo LTP_ATTRIBUTE_UNUSED)
248 {
249 }
250
setup(void)251 void setup(void)
252 {
253 int nr_msgqs;
254
255 tst_tmpdir();
256
257 tst_sig(FORK, DEF_HANDLER, cleanup);
258
259 TEST_PAUSE;
260
261 nr_msgqs = get_max_msgqueues();
262 if (nr_msgqs < 0)
263 cleanup();
264
265 MSGMNI = nr_msgqs - get_used_msgqueues();
266 if (MSGMNI > MAXNPROCS)
267 MSGMNI = MAXNPROCS;
268 if (MSGMNI <= 0) {
269 tst_resm(TBROK,
270 "Max number of message queues already used, cannot create more.");
271 cleanup();
272 }
273 }
274
cleanup(void)275 void cleanup(void)
276 {
277 int status;
278
279 #ifdef DEBUG
280 tst_resm(TINFO, "Removing the message queue");
281 #endif
282 (void)msgctl(tid, IPC_RMID, NULL);
283 if ((status = msgctl(tid, IPC_STAT, NULL)) != -1) {
284 (void)msgctl(tid, IPC_RMID, NULL);
285 tst_resm(TFAIL, "msgctl(tid, IPC_RMID) failed");
286
287 }
288
289 tst_rmdir();
290 }
291