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342 lines
8.1 KiB
342 lines
8.1 KiB
/*
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* Copyright (c) International Business Machines Corp., 2004
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* Copyright (c) Linux Test Project, 2004-2017
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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* the GNU General Public License for more details.
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*/
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/*
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* DESCRIPTION
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* hugeshmctl01 - test the IPC_STAT, IPC_SET and IPC_RMID commands as
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* they are used with shmctl()
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*
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* ALGORITHM
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* loop if that option was specified
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* create a large shared memory segment with read and write permission
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* set up any test case specific conditions
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* call shmctl() using the TEST macro
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* check the return code
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* if failure, issue a FAIL message.
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* otherwise,
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* if doing functionality testing
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* call the correct test function
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* if the conditions are correct,
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* issue a PASS message
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* otherwise
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* issue a FAIL message
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* otherwise
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* issue a PASS message
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* call cleanup
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*
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* HISTORY
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* 03/2001 - Written by Wayne Boyer
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* 04/2004 - Updated by Robbie Williamson
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*/
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#include <limits.h>
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#include "hugetlb.h"
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#define FIRST 0
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#define SECOND 1
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#define N_ATTACH 4U
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#define NEWMODE 0066
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static size_t shm_size;
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static int shm_id_1 = -1;
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static struct shmid_ds buf;
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static time_t save_time;
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static int stat_time;
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static void *set_shared;
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static void stat_setup(void);
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static void stat_cleanup(void);
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static void set_setup(void);
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static void func_stat(void);
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static void func_set(void);
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static void func_rmid(void);
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static void *set_shmat(void);
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static long hugepages = 128;
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static struct tst_option options[] = {
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{"s:", &nr_opt, "-s num Set the number of the been allocated hugepages"},
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{NULL, NULL, NULL}
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};
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struct tcase {
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int cmd;
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void (*func_test) (void);
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void (*func_setup) (void);
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} tcases[] = {
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{IPC_STAT, func_stat, stat_setup},
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{IPC_STAT, func_stat, stat_setup},
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{IPC_SET, func_set, set_setup},
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{IPC_RMID, func_rmid, NULL}
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};
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static void test_hugeshmctl(void)
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{
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unsigned int i;
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/* initialize stat_time */
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stat_time = FIRST;
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/*
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* Create a shared memory segment with read and write
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* permissions. Do this here instead of in setup()
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* so that looping (-i) will work correctly.
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*/
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shm_id_1 = shmget(shmkey, shm_size,
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SHM_HUGETLB | IPC_CREAT | IPC_EXCL | SHM_RW);
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if (shm_id_1 == -1)
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tst_brk(TBROK | TERRNO, "shmget #main");
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for (i = 0; i < ARRAY_SIZE(tcases); i++) {
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/*
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* if needed, set up any required conditions by
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* calling the appropriate setup function
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*/
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if (tcases[i].func_setup != NULL)
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(*tcases[i].func_setup) ();
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if (shmctl(shm_id_1, tcases[i].cmd, &buf) == -1) {
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tst_res(TFAIL | TERRNO, "shmctl #main");
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continue;
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}
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(*tcases[i].func_test) ();
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}
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}
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/*
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* set_shmat() - Attach the shared memory and return the pointer. Use
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* this seperate routine to avoid code duplication in
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* stat_setup() below.
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*/
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void *set_shmat(void)
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{
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void *rval;
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rval = shmat(shm_id_1, 0, 0);
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if (rval == (void *)-1)
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tst_brk(TBROK | TERRNO, "set shmat");
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return rval;
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}
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/*
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* stat_setup() - Set up for the IPC_STAT command with shmctl().
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* Make things interesting by forking some children
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* that will either attach or inherit the shared memory.
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*/
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static void stat_setup(void)
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{
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unsigned int i;
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void *test;
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pid_t pid;
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/*
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* The first time through, let the children attach the memory.
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* The second time through, attach the memory first and let
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* the children inherit the memory.
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*/
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if (stat_time == SECOND) {
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/*
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* use the global "set_shared" variable here so that
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* it can be removed in the stat_func() routine.
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*/
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set_shared = set_shmat();
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}
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for (i = 0; i < N_ATTACH; i++) {
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switch (pid = SAFE_FORK()) {
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case 0:
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test = (stat_time == FIRST) ? set_shmat() : set_shared;
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/* do an assignement for fun */
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*(int *)test = i;
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TST_CHECKPOINT_WAKE(0);
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TST_CHECKPOINT_WAIT(1);
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/* now we're back - detach the memory and exit */
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if (shmdt(test) == -1)
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tst_brk(TBROK | TERRNO,
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"shmdt in stat_setup()");
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exit(0);
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default:
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TST_CHECKPOINT_WAIT(0);
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}
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}
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}
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/*
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* func_stat() - check the functionality of the IPC_STAT command with shmctl()
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* by looking at the pid of the creator, the segement size,
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* the number of attaches and the mode.
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*/
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static void func_stat(void)
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{
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pid_t pid;
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/* check perm, pid, nattach and size */
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pid = getpid();
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if (buf.shm_cpid != pid) {
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tst_res(TFAIL, "creator pid is incorrect");
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goto fail;
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}
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if (buf.shm_segsz != shm_size) {
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tst_res(TFAIL, "segment size is incorrect");
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goto fail;
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}
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/*
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* The first time through, only the children attach the memory, so
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* the attaches equal N_ATTACH + stat_time (0). The second time
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* through, the parent attaches the memory and the children inherit
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* that memory so the attaches equal N_ATTACH + stat_time (1).
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*/
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if (buf.shm_nattch != N_ATTACH + stat_time) {
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tst_res(TFAIL, "# of attaches is incorrect - %lu",
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(unsigned long)buf.shm_nattch);
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goto fail;
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}
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/* use MODE_MASK to make sure we are comparing the last 9 bits */
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if ((buf.shm_perm.mode & MODE_MASK) != ((SHM_RW) & MODE_MASK)) {
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tst_res(TFAIL, "segment mode is incorrect");
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goto fail;
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}
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tst_res(TPASS, "pid, size, # of attaches and mode are correct "
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"- pass #%d", stat_time);
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fail:
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stat_cleanup();
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/* save the change time for use in the next test */
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save_time = buf.shm_ctime;
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}
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/*
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* stat_cleanup() - signal the children to clean up after themselves and
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* have the parent make dessert, er, um, make that remove
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* the shared memory that is no longer needed.
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*/
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static void stat_cleanup(void)
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{
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unsigned int i;
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int status;
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/* wake up the childern so they can detach the memory and exit */
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TST_CHECKPOINT_WAKE2(1, N_ATTACH);
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for (i = 0; i < N_ATTACH; i++)
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SAFE_WAIT(&status);
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/* remove the parent's shared memory the second time through */
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if (stat_time == SECOND)
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if (shmdt(set_shared) == -1)
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tst_res(TBROK | TERRNO, "shmdt in stat_cleanup()");
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stat_time++;
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}
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/*
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* set_setup() - set up for the IPC_SET command with shmctl()
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*/
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static void set_setup(void)
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{
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/* set up a new mode for the shared memory segment */
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buf.shm_perm.mode = SHM_RW | NEWMODE;
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/* sleep for one second to get a different shm_ctime value */
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sleep(1);
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}
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/*
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* func_set() - check the functionality of the IPC_SET command with shmctl()
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*/
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static void func_set(void)
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{
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/* first stat the shared memory to get the new data */
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if (shmctl(shm_id_1, IPC_STAT, &buf) == -1) {
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tst_res(TBROK | TERRNO, "shmctl in func_set()");
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return;
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}
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if ((buf.shm_perm.mode & MODE_MASK) != ((SHM_RW | NEWMODE) & MODE_MASK)) {
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tst_res(TFAIL, "new mode is incorrect");
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return;
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}
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if (save_time >= buf.shm_ctime) {
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tst_res(TFAIL, "change time is incorrect");
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return;
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}
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tst_res(TPASS, "new mode and change time are correct");
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}
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/*
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* func_rmid() - check the functionality of the IPC_RMID command with shmctl()
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*/
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static void func_rmid(void)
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{
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/* Do another shmctl() - we should get EINVAL */
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if (shmctl(shm_id_1, IPC_STAT, &buf) != -1)
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tst_brk(TBROK, "shmctl in func_rmid() "
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"succeeded unexpectedly");
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if (errno != EINVAL)
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tst_res(TFAIL | TERRNO, "shmctl in func_rmid() failed "
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"unexpectedly - expect errno=EINVAL, got");
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else
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tst_res(TPASS, "shmctl in func_rmid() failed as expected, "
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"shared memory appears to be removed");
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shm_id_1 = -1;
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}
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void setup(void)
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{
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long hpage_size;
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save_nr_hugepages();
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if (nr_opt)
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hugepages = SAFE_STRTOL(nr_opt, 0, LONG_MAX);
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limit_hugepages(&hugepages);
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set_sys_tune("nr_hugepages", hugepages, 1);
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hpage_size = SAFE_READ_MEMINFO("Hugepagesize:") * 1024;
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shm_size = hpage_size * hugepages / 2;
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update_shm_size(&shm_size);
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shmkey = getipckey();
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}
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void cleanup(void)
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{
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rm_shm(shm_id_1);
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restore_nr_hugepages();
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}
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static struct tst_test test = {
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.needs_root = 1,
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.forks_child = 1,
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.options = options,
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.setup = setup,
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.cleanup = cleanup,
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.test_all = test_hugeshmctl,
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.needs_checkpoints = 1,
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};
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