| /* Copyright (c) 2014 Red Hat, Inc. |
| * |
| * This program is free software: you can redistribute it and/or modify |
| * it under the terms of version 2 the GNU General Public License as |
| * published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program. If not, see <http://www.gnu.org/licenses/>. |
| *********************************************************************** |
| * File: msg_comm.c |
| * |
| * Description: |
| * 1. Clones two child processes with CLONE_NEWIPC flag, each child |
| * gets System V message queue (msg) with the _identical_ key. |
| * 2. Child1 appends a message with identifier #1 to the message queue. |
| * 3. Child2 appends a message with identifier #2 to the message queue. |
| * 4. Appends to the message queue with the identical key but from |
| * two different IPC namespaces should not interfere with each other |
| * and so child1 checks whether its message queue doesn't contain |
| * a message with identifier #2, if it doesn't test passes, otherwise |
| * test fails. |
| */ |
| |
| #define _GNU_SOURCE |
| #include <sys/ipc.h> |
| #include <sys/msg.h> |
| #include <sys/types.h> |
| #include <sys/wait.h> |
| #include <stdio.h> |
| #include <errno.h> |
| #include "test.h" |
| #include "safe_macros.h" |
| #include "libclone.h" |
| #include "ipcns_helper.h" |
| |
| |
| #define TESTKEY 124426L |
| #define MSGSIZE 50 |
| char *TCID = "msg_comm"; |
| int TST_TOTAL = 1; |
| struct tst_checkpoint checkpoint1; |
| struct tst_checkpoint checkpoint2; |
| struct sysv_msg { |
| long mtype; |
| char mtext[MSGSIZE]; |
| }; |
| |
| |
| static void cleanup(void) |
| { |
| tst_rmdir(); |
| } |
| |
| static void setup(void) |
| { |
| tst_require_root(NULL); |
| check_newipc(); |
| tst_tmpdir(); |
| TST_CHECKPOINT_CREATE(&checkpoint1); |
| TST_CHECKPOINT_CREATE(&checkpoint2); |
| } |
| |
| int chld1_msg(void *arg) |
| { |
| int id, n, rval = 0; |
| struct sysv_msg m; |
| struct sysv_msg rec; |
| |
| id = msgget(TESTKEY, IPC_CREAT | 0600); |
| if (id == -1) { |
| perror("msgget"); |
| return 2; |
| } |
| |
| m.mtype = 1; |
| m.mtext[0] = 'A'; |
| if (msgsnd(id, &m, sizeof(struct sysv_msg) - sizeof(long), 0) == -1) { |
| perror("msgsnd"); |
| msgctl(id, IPC_RMID, NULL); |
| return 2; |
| } |
| |
| /* wait for child2 to write into the message queue */ |
| TST_CHECKPOINT_CHILD_WAIT(&checkpoint2); |
| |
| /* if child1 message queue has changed (by child2) report fail */ |
| n = msgrcv(id, &rec, sizeof(struct sysv_msg) - sizeof(long), |
| 2, IPC_NOWAIT); |
| if (n == -1 && errno != ENOMSG) { |
| perror("msgrcv"); |
| msgctl(id, IPC_RMID, NULL); |
| return 2; |
| } |
| /* if mtype #2 was found in the message queue, it is fail */ |
| if (n > 0) { |
| rval = 1; |
| } |
| |
| /* tell child2 to continue */ |
| TST_CHECKPOINT_SIGNAL_CHILD(NULL, &checkpoint1); |
| |
| msgctl(id, IPC_RMID, NULL); |
| return rval; |
| } |
| |
| int chld2_msg(void *arg) |
| { |
| int id; |
| struct sysv_msg m; |
| |
| id = msgget(TESTKEY, IPC_CREAT | 0600); |
| if (id == -1) { |
| perror("msgget"); |
| return 2; |
| } |
| |
| m.mtype = 2; |
| m.mtext[0] = 'B'; |
| if (msgsnd(id, &m, sizeof(struct sysv_msg) - sizeof(long), 0) == -1) { |
| perror("msgsnd"); |
| msgctl(id, IPC_RMID, NULL); |
| return 2; |
| } |
| |
| /* tell child1 to continue */ |
| TST_CHECKPOINT_SIGNAL_CHILD(NULL, &checkpoint2); |
| |
| /* wait for child1 */ |
| TST_CHECKPOINT_CHILD_WAIT(&checkpoint1); |
| |
| msgctl(id, IPC_RMID, NULL); |
| return 0; |
| } |
| |
| static void test(void) |
| { |
| int status, ret = 0; |
| |
| ret = do_clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld1_msg, NULL); |
| if (ret == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "clone failed"); |
| |
| ret = do_clone_unshare_test(T_CLONE, CLONE_NEWIPC, chld2_msg, NULL); |
| if (ret == -1) |
| tst_brkm(TBROK | TERRNO, cleanup, "clone failed"); |
| |
| |
| while (wait(&status) > 0) { |
| if (WIFEXITED(status) && WEXITSTATUS(status) == 1) |
| ret = 1; |
| if (WIFEXITED(status) && WEXITSTATUS(status) == 2) |
| tst_brkm(TBROK | TERRNO, cleanup, "error in child"); |
| if (WIFSIGNALED(status)) { |
| tst_resm(TFAIL, "child was killed with signal %s", |
| tst_strsig(WTERMSIG(status))); |
| return; |
| } |
| } |
| |
| if (ret) |
| tst_resm(TFAIL, "SysV msg: communication with identical keys" |
| " between namespaces"); |
| else |
| tst_resm(TPASS, "SysV msg: communication with identical keys" |
| " between namespaces"); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| const char *msg; |
| int lc; |
| |
| msg = parse_opts(argc, argv, NULL, NULL); |
| if (msg != NULL) |
| tst_brkm(TBROK, NULL, "OPTION PARSING ERROR - %s", msg); |
| |
| setup(); |
| |
| for (lc = 0; TEST_LOOPING(lc); lc++) |
| test(); |
| |
| cleanup(); |
| tst_exit(); |
| } |