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testsuite: Add check for shared memory

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Created a test process test_shm that allocates a shared memory
segment and prints the segment ID. pmap testsuite runs pmap to
check that the segment is found.

The value returned by shmget() is the same value that is printed
in the fifth column /proc/<PID>/maps

Signed-off-by: Craig Small <csmall@dropbear.xyz>
This commit is contained in:
Craig Small
2022-04-26 22:04:05 +10:00
parent 1f085f5a9f
commit 9c5397a941
5 changed files with 100 additions and 1 deletions
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69
lib/test_shm.c Normal file
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/*
* test_shm -- program to create a shared memory segment for testing
*
* Copyright 2022 Craig Small <csmall@dropbear.xyz>
*
* 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/shm.h>
#include "c.h"
#define DEFAULT_SLEEPTIME 300
#define SHM_SIZE 50
static void usage(void)
{
fprintf(stderr, " %s [options]\n", program_invocation_short_name);
fprintf(stderr, " -s <seconds>\n");
exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
int sleep_time, opt;
int shm_id;
void *shm_addr;
sleep_time = DEFAULT_SLEEPTIME;
while ((opt = getopt(argc, argv, "s:")) != -1)
{
switch(opt)
{
case 's':
sleep_time = atoi(optarg);
if (sleep_time < 1)
{
fprintf(stderr, "sleep time must be 1 second or more\n");
usage();
}
break;
default:
usage();
}
}
/* get some shared memory */
if ( (shm_id = shmget(IPC_PRIVATE, SHM_SIZE, IPC_CREAT | 0666)) < 0)
xerr(EXIT_FAILURE, "Unable to shmget()");
if ( (shm_addr = shmat(shm_id, NULL, SHM_RDONLY)) < 0)
xerr(EXIT_FAILURE, "Unable to shmat()");
printf("SHMID: %llx\n", shm_id);
sleep(sleep_time);
return EXIT_SUCCESS;
}