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/*
* Test the POSIX shared-memory API.
* Dedicated to the 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 __unused)
{
;
}
int
main(int argc, char **argv)
{
char buf[1024], *cp, c;
int error, desc, rv;
long scval;
sigset_t ss;
struct sigaction sa;
void *region;
size_t i, 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...
*/
char *tmpdir = getenv("TMPDIR");
if (tmpdir == NULL)
tmpdir = "/tmp";
snprintf(buf, sizeof(buf) - 1,
"%s/shmtest.XXXXXXXXXXXX", tmpdir);
buf[sizeof(buf) - 1] = '\0';
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);
}
if (lseek(desc, 0, SEEK_SET) == -1)
_exit(1);
for (i = 0; i < psize; i++) {
error = read(desc, &c, 1);
if (c != '\151')
_exit(1);
}
_exit(0);
} else {
int status;
memset(region, '\151', psize - 2);
error = pwrite(desc, region, 2, psize - 2);
if (error != 2) {
if (error >= 0)
errx(1, "short write %d", error);
else
err(1, "shmfd write");
}
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);
}
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