minix/test/ipc/shmat/shmat01.c

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2009-09-21 16:53:53 +02:00
/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/*
* NAME
* shmat01.c
*
* DESCRIPTION
* shmat01 - test that shmat() works correctly
*
* ALGORITHM
* create a shared memory resouce with read/write permissions
* loop if that option was specified
* call shmat() with the TEST() macro using three valid conditions
* check the return code
* if failure, issue a FAIL message.
* otherwise,
* if doing functionality testing
* check for the correct conditions after the call
* if correct,
* issue a PASS message
* otherwise
* issue a FAIL message
* call cleanup
*
* USAGE: <for command-line>
* shmat01 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
* where, -c n : Run n copies concurrently.
* -f : Turn off functionality Testing.
* -i n : Execute test n times.
* -I x : Execute test for x seconds.
* -P x : Pause for x seconds between iterations.
* -t : Turn on syscall timing.
*
* HISTORY
* 03/2001 - Written by Wayne Boyer
*
* RESTRICTIONS
* none
*/
#include "ipcshm.h"
char *TCID = "shmat01";
int TST_TOTAL = 3;
extern int Tst_count;
#define CASE0 10 /* values to write into the shared */
#define CASE1 20 /* memory location. */
#ifdef __ia64__
#define UNALIGNED 0x5ff00eee /* an address not evenly divisible by */
#elif defined __XTENSA__ /* SHMLBA which defaults to 0x8048e8b */
/* TASK_SIZE on Xtensa is only 0x40000000 */
#define UNALIGNED 0x28ffeeee
#elif defined __arm__
#define UNALIGNED 0x28ffeeee
#else
#define UNALIGNED 0x5fffeeee
#endif
int shm_id_1 = -1;
void *addr; /* for result of shmat-call */
struct test_case_t {
int *shmid;
void *addr;
int flags;
} TC[] = {
/* a straight forward read/write attach */
{&shm_id_1, 0, 0},
/* an attach using non aligned memory */
{&shm_id_1, (void *)UNALIGNED, SHM_RND},
/* a read only attach */
{&shm_id_1, 0, SHM_RDONLY}
};
int main(int ac, char **av)
{
int lc; /* loop counter */
char *msg; /* message returned from parse_opts */
int i;
void check_functionality(int);
/* parse standard options */
if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
}
setup(); /* global setup */
/* The following loop checks looping state if -i option given */
for (lc = 0; TEST_LOOPING(lc); lc++) {
/* reset Tst_count in case we are looping */
Tst_count = 0;
/* loop through the test cases */
for (i=0; i<TST_TOTAL; i++) {
/*
* Use TEST macro to make the call
*/
errno = 0;
addr = shmat(*(TC[i].shmid), (void *)(TC[i].addr),
TC[i].flags);
TEST_ERRNO = errno;
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if (addr == (void *)-1) {
tst_brkm(TFAIL, cleanup, "%s call failed - "
"errno = %d : %s", TCID, TEST_ERRNO,
strerror(TEST_ERRNO));
} else {
if (STD_FUNCTIONAL_TEST) {
check_functionality(i);
} else {
tst_resm(TPASS, "call succeeded");
}
}
/*
* clean up things in case we are looping - in
* this case, detach the shared memory
*/
if (shmdt((const void *)addr) == -1) {
tst_brkm(TBROK, cleanup,
"Couldn't detach shared memory");
}
}
}
cleanup();
/*NOTREACHED*/
return(0);
}
/*
* check_functionality - check various conditions to make sure they
* are correct.
*/
void
check_functionality(int i)
{
void *orig_add;
int *shared;
int fail = 0;
struct shmid_ds buf;
shared = (int *)addr;
/* stat the shared memory ID */
if (shmctl(shm_id_1, IPC_STAT, &buf) == -1) {
tst_brkm(TBROK, cleanup, "couldn't stat shared memory");
}
/* check the number of attaches */
if (buf.shm_nattch != 1) {
tst_resm(TFAIL, "# of attaches is incorrect");
return;
}
/* check the size of the segment */
if (buf.shm_segsz != INT_SIZE) {
tst_resm(TFAIL, "segment size is incorrect");
return;
}
/* check for specific conditions depending on the type of attach */
switch(i) {
case 0:
/*
* Check the functionality of the first call by simply
* "writing" a value to the shared memory space.
* If this fails the program will get a SIGSEGV, dump
* core and exit.
*/
*shared = CASE0;
break;
case 1:
/*
* Check the functionality of the second call by writing
* a value to the shared memory space and then checking
* that the original address given was rounded down as
* specified in the man page.
*/
*shared = CASE1;
orig_add = (void *)((unsigned long)addr + (((unsigned long)TC[i].addr)%SHMLBA));
if (orig_add != TC[i].addr) {
tst_resm(TFAIL, "shared memory address is not "
"correct");
fail = 1;
}
break;
case 2:
/*
* This time the shared memory is read only. Read the value
* and check that it is equal to the value set in case #2,
* because shared memory is persistent.
*/
if (*shared != CASE1) {
tst_resm(TFAIL, "shared memory value isn't correct");
fail = 1;
}
break;
}
if (!fail) {
tst_resm(TPASS, "conditions and functionality are correct");
}
}
/*
* setup() - performs all the ONE TIME setup for this test.
*/
void
setup(void)
{
/* capture signals */
tst_sig(NOFORK, DEF_HANDLER, cleanup);
/* Pause if that option was specified */
TEST_PAUSE;
/*
* Create a temporary directory and cd into it.
* This helps to ensure that a unique msgkey is created.
* See ../lib/libipc.c for more information.
*/
tst_tmpdir();
/* Get an IPC resouce key */
shmkey = getipckey();
/* create a shared memory resource with read and write permissions */
if ((shm_id_1 = shmget(shmkey++, INT_SIZE, SHM_RW | IPC_CREAT |
IPC_EXCL)) == -1) {
tst_brkm(TBROK, cleanup, "Failed to create shared memory "
"resource 1 in setup()");
}
}
/*
* cleanup() - performs all the ONE TIME cleanup for this test at completion
* or premature exit.
*/
void
cleanup(void)
{
/* if it exists, remove the shared memory resource */
rm_shm(shm_id_1);
/* Remove the temporary directory */
tst_rmdir();
/*
* print timing stats if that option was specified.
* print errno log if that option was specified.
*/
TEST_CLEANUP;
/* exit with return code appropriate for results */
tst_exit();
}