| /* ************************************************************************* |
| * Copyright (c) International Business Machines Corp., 2009 |
| * This program is free software; you can redistribute it and/or modify |
| * it under the terms of the GNU General Public License as published by |
| * the Free Software Foundation; either version 2 of the License, or |
| * (at your option) any later version. |
| * |
| * 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, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| * |
| * Author: Veerendra C <vechandr@in.ibm.com> |
| * |
| * Test Assertion: |
| * This testcase verifies the semaphore isoloation in 2 diff containers. |
| * It tries to create/access a semaphore created with the same KEY. |
| * |
| * Description: |
| * Create 2 'containers' with the below flag value |
| * Flag = clone, clone(CLONE_NEWIPC), or unshare(CLONE_NEWIPC) |
| * In Cont1, create semaphore with key 124326L |
| * In Cont2, try to access the semaphore created in Cont1. |
| * PASS : |
| * If flag = None and the semaphore is accessible in Cont2. |
| * If flag = unshare/clone and the semaphore is not accessible in Cont2. |
| * If semaphore is not accessible in Cont2, creates new semaphore with |
| * the same key to double check isloation in IPCNS. |
| * |
| * FAIL : |
| * If flag = none and the semaphore is not accessible. |
| * If flag = unshare/clone and semaphore is accessible in Cont2. |
| * If the new semaphore creation Fails. |
| ***************************************************************************/ |
| |
| #define _GNU_SOURCE 1 |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <unistd.h> |
| #include <string.h> |
| #include <sys/ipc.h> |
| #include <sys/sem.h> |
| #include <libclone.h> |
| #include "test.h" |
| #include "ipcns_helper.h" |
| |
| #define MY_KEY 124326L |
| #define UNSHARESTR "unshare" |
| #define CLONESTR "clone" |
| #define NONESTR "none" |
| |
| char *TCID = "semtest_2ns"; |
| int TST_TOTAL = 1; |
| int p1[2]; |
| int p2[2]; |
| static struct sembuf semop_lock[2] = { |
| /* sem_num, sem_op, flag */ |
| {0, 0, 0}, /* wait for sem#0 to become 0 */ |
| {0, 1, SEM_UNDO} /* then increment sem#0 by 1 */ |
| }; |
| |
| static struct sembuf semop_unlock[1] = { |
| /* sem_num, sem_op, flag */ |
| {0, -1, (IPC_NOWAIT | SEM_UNDO)} /* decrement sem#0 by 1 (sets it to 0) */ |
| }; |
| |
| /* |
| * sem_lock() - Locks the semaphore for crit-sec updation, and unlocks it later |
| */ |
| void sem_lock(int id) |
| { |
| /* Checking the semlock and simulating as if the crit-sec is updated */ |
| if (semop(id, &semop_lock[0], 2) < 0) { |
| perror("sem lock error"); |
| tst_brkm(TBROK, NULL, "semop failed"); |
| } |
| tst_resm(TINFO, "Sem1: File locked, Critical section is updated..."); |
| sleep(2); |
| if (semop(id, &semop_unlock[0], 1) < 0) { |
| perror("sem unlock error"); |
| tst_brkm(TBROK, NULL, "semop failed"); |
| } |
| } |
| |
| /* |
| * check_sem1 - does not read -- it writes to check_sem2() when it's done. |
| */ |
| int check_sem1(void *vtest) |
| { |
| int id1; |
| |
| (void) vtest; |
| |
| close(p1[0]); |
| /* 1. Create (or fetch if existing) the binary semaphore */ |
| id1 = semget(MY_KEY, 1, IPC_CREAT | IPC_EXCL | 0666); |
| if (id1 == -1) { |
| perror("Semaphore create"); |
| if (errno != EEXIST) { |
| perror("semget failure"); |
| tst_brkm(TBROK, NULL, "semget failure"); |
| } |
| id1 = semget(MY_KEY, 1, 0); |
| if (id1 == -1) { |
| perror("Semaphore create"); |
| tst_brkm(TBROK, NULL, "semget failure"); |
| } |
| } |
| |
| write(p1[1], "go", 3); |
| tst_resm(TINFO, "Cont1: Able to create semaphore"); |
| tst_exit(); |
| } |
| |
| /* |
| * check_sem2() reads from check_sem1() and writes to main() when it's done. |
| */ |
| |
| int check_sem2(void *vtest) |
| { |
| char buf[3]; |
| int id2; |
| |
| (void) vtest; |
| |
| close(p1[1]); |
| close(p2[0]); |
| read(p1[0], buf, 3); |
| |
| id2 = semget(MY_KEY, 1, 0); |
| if (id2 != -1) { |
| sem_lock(id2); |
| write(p2[1], "exists", 7); |
| } else { |
| /* Trying to create a new semaphore, if semaphore is not existing */ |
| id2 = semget(MY_KEY, 1, IPC_CREAT | IPC_EXCL | 0666); |
| if (id2 == -1) { |
| perror("Semaphore create"); |
| if (errno != EEXIST) { |
| perror("semget failure"); |
| tst_resm(TBROK, "semget failure"); |
| } |
| } else |
| tst_resm(TINFO, |
| "Cont2: Able to create semaphore with sameKey"); |
| /* Passing the pipe Not-found mesg */ |
| write(p2[1], "notfnd", 7); |
| } |
| |
| tst_exit(); |
| } |
| |
| static void setup(void) |
| { |
| tst_require_root(NULL); |
| check_newipc(); |
| } |
| |
| int main(int argc, char *argv[]) |
| { |
| int ret, id, use_clone = T_NONE; |
| char *tsttype = NONESTR; |
| char buf[7]; |
| |
| setup(); |
| |
| if (argc != 2) { |
| tst_resm(TINFO, "Usage: %s <clone| unshare| none>", argv[0]); |
| tst_resm(TINFO, " where clone, unshare, or fork specifies" |
| " unshare method."); |
| tst_exit(); |
| } |
| |
| /* Using PIPE's to sync between container and Parent */ |
| if (pipe(p1) == -1) { |
| perror("pipe1"); |
| tst_exit(); |
| } |
| if (pipe(p2) == -1) { |
| perror("pipe2"); |
| tst_exit(); |
| } |
| |
| if (strcmp(argv[1], "clone") == 0) { |
| use_clone = T_CLONE; |
| tsttype = CLONESTR; |
| } else if (strcmp(argv[1], "unshare") == 0) { |
| use_clone = T_UNSHARE; |
| tsttype = UNSHARESTR; |
| } |
| |
| tst_resm(TINFO, "Semaphore Namespaces Test : %s", tsttype); |
| |
| /* Create 2 containers */ |
| ret = do_clone_unshare_test(use_clone, CLONE_NEWIPC, check_sem1, NULL); |
| if (ret < 0) { |
| tst_brkm(TFAIL, NULL, "clone/unshare failed"); |
| } |
| |
| ret = do_clone_unshare_test(use_clone, CLONE_NEWIPC, check_sem2, NULL); |
| if (ret < 0) { |
| tst_brkm(TFAIL, NULL, "clone/unshare failed"); |
| } |
| close(p2[1]); |
| read(p2[0], buf, 7); |
| |
| if (strcmp(buf, "exists") == 0) |
| if (use_clone == T_NONE) |
| tst_resm(TPASS, |
| "Plain cloned process able to access the semaphore " |
| "created"); |
| else |
| tst_resm(TFAIL, |
| "%s : In namespace2 found the semaphore " |
| "created in Namespace1", tsttype); |
| else if (use_clone == T_NONE) |
| tst_resm(TFAIL, "Plain cloned process didn't find semaphore"); |
| else |
| tst_resm(TPASS, |
| "%s : In namespace2 unable to access the semaphore " |
| "created in Namespace1", tsttype); |
| |
| /* Delete the semaphore */ |
| id = semget(MY_KEY, 1, 0); |
| semctl(id, IPC_RMID, 0); |
| tst_exit(); |
| } |