Add a little test program to demonstrate POSIX Shared Memory Objects.
This commit is contained in:
parent
5c317306cb
commit
8c3f05ad1d
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=59498
4
tools/test/posixshm/README
Normal file
4
tools/test/posixshm/README
Normal file
@ -0,0 +1,4 @@
|
||||
$FreeBSD$
|
||||
|
||||
This is a simple program to test/demonstrate the POSIX Shared Memory
|
||||
Objects feature set. `make shm_test' to build.
|
144
tools/test/posixshm/shm_test.c
Normal file
144
tools/test/posixshm/shm_test.c
Normal file
@ -0,0 +1,144 @@
|
||||
/*
|
||||
* Test the POSIX shared-memory API.
|
||||
* Dedicated to tyhe public domain by Garrett A. Wollman, 2000.
|
||||
* $FreeBSD$
|
||||
*/
|
||||
|
||||
#include <sys/types.h>
|
||||
#include <sys/mman.h>
|
||||
#include <sys/wait.h>
|
||||
|
||||
#include <err.h>
|
||||
#include <errno.h>
|
||||
#include <fcntl.h>
|
||||
#include <signal.h>
|
||||
#include <stdio.h>
|
||||
#include <stdlib.h>
|
||||
#include <string.h>
|
||||
#include <unistd.h>
|
||||
|
||||
/*
|
||||
* Signal handler which does nothing.
|
||||
*/
|
||||
static void
|
||||
ignoreit(int sig)
|
||||
{
|
||||
;
|
||||
}
|
||||
|
||||
int
|
||||
main(int argc, char **argv)
|
||||
{
|
||||
char buf[1024], *cp;
|
||||
int desc, rv;
|
||||
long scval;
|
||||
sigset_t ss;
|
||||
struct sigaction sa;
|
||||
void *region;
|
||||
size_t psize;
|
||||
|
||||
#ifndef _POSIX_SHARED_MEMORY_OBJECTS
|
||||
printf("_POSIX_SHARED_MEMORY_OBJECTS is undefined\n");
|
||||
#else
|
||||
printf("_POSIX_SHARED_MEMORY_OBJECTS is defined as %ld\n",
|
||||
(long)_POSIX_SHARED_MEMORY_OBJECTS - 0);
|
||||
if (_POSIX_SHARED_MEMORY_OBJECTS - 0 == -1)
|
||||
printf("***Indicates this feature may be unsupported!\n");
|
||||
#endif
|
||||
errno = 0;
|
||||
scval = sysconf(_SC_SHARED_MEMORY_OBJECTS);
|
||||
if (scval == -1 && errno != 0) {
|
||||
err(1, "sysconf(_SC_SHARED_MEMORY_OBJECTS)");
|
||||
} else {
|
||||
printf("sysconf(_SC_SHARED_MEMORY_OBJECTS) returns %ld\n",
|
||||
scval);
|
||||
if (scval == -1)
|
||||
printf("***Indicates this feature is unsupported!\n");
|
||||
}
|
||||
|
||||
errno = 0;
|
||||
scval = sysconf(_SC_PAGESIZE);
|
||||
if (scval == -1 && errno != 0) {
|
||||
err(1, "sysconf(_SC_PAGESIZE)");
|
||||
} else if (scval <= 0 || (size_t)psize != psize) {
|
||||
warnx("bogus return from sysconf(_SC_PAGESIZE): %ld",
|
||||
scval);
|
||||
psize = 4096;
|
||||
} else {
|
||||
printf("sysconf(_SC_PAGESIZE) returns %ld\n", scval);
|
||||
psize = scval;
|
||||
}
|
||||
|
||||
argc--, argv++;
|
||||
|
||||
if (*argv) {
|
||||
strncat(buf, *argv, (sizeof buf) - 1);
|
||||
desc = shm_open(buf, O_EXCL | O_CREAT | O_RDWR, 0600);
|
||||
} else {
|
||||
do {
|
||||
/*
|
||||
* Can't use mkstemp for obvious reasons...
|
||||
*/
|
||||
strcpy(buf, "/tmp/shmtest.XXXXXXXXXXXX");
|
||||
mktemp(buf);
|
||||
desc = shm_open(buf, O_EXCL | O_CREAT | O_RDWR, 0600);
|
||||
} while (desc < 0 && errno == EEXIST);
|
||||
}
|
||||
|
||||
if (desc < 0)
|
||||
err(1, "shm_open");
|
||||
|
||||
if (shm_unlink(buf) < 0)
|
||||
err(1, "shm_unlink");
|
||||
|
||||
if (ftruncate(desc, (off_t)psize) < 0)
|
||||
err(1, "ftruncate");
|
||||
|
||||
region = mmap((void *)0, psize, PROT_READ | PROT_WRITE, MAP_SHARED,
|
||||
desc, (off_t)0);
|
||||
if (region == MAP_FAILED)
|
||||
err(1, "mmap");
|
||||
memset(region, '\377', psize);
|
||||
|
||||
sa.sa_flags = 0;
|
||||
sa.sa_handler = ignoreit;
|
||||
sigemptyset(&sa.sa_mask);
|
||||
if (sigaction(SIGUSR1, &sa, (struct sigaction *)0) < 0)
|
||||
err(1, "sigaction");
|
||||
|
||||
sigemptyset(&ss);
|
||||
sigaddset(&ss, SIGUSR1);
|
||||
if (sigprocmask(SIG_BLOCK, &ss, (sigset_t *)0) < 0)
|
||||
err(1, "sigprocmask");
|
||||
|
||||
rv = fork();
|
||||
if (rv < 0) {
|
||||
err(1, "fork");
|
||||
} else if (rv == 0) {
|
||||
sigemptyset(&ss);
|
||||
sigsuspend(&ss);
|
||||
|
||||
for (cp = region; cp < (char *)region + psize; cp++)
|
||||
if (*cp != '\151')
|
||||
_exit(1);
|
||||
_exit(0);
|
||||
} else {
|
||||
int status;
|
||||
|
||||
memset(region, '\151', psize);
|
||||
kill(rv, SIGUSR1);
|
||||
waitpid(rv, &status, 0);
|
||||
|
||||
if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
|
||||
printf("Functionality test successful\n");
|
||||
exit(0);
|
||||
} else if (WIFEXITED(status)) {
|
||||
printf("Child process exited with status %d\n",
|
||||
WEXITSTATUS(status));
|
||||
} else {
|
||||
printf("Child process terminated with %s\n",
|
||||
strsignal(WTERMSIG(status)));
|
||||
}
|
||||
}
|
||||
exit(1);
|
||||
}
|
Loading…
Reference in New Issue
Block a user