145 lines
3.1 KiB
C
145 lines
3.1 KiB
C
/*
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* Test the POSIX shared-memory API.
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* Dedicated to tyhe public domain by Garrett A. Wollman, 2000.
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* $FreeBSD$
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*/
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#include <sys/types.h>
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#include <sys/mman.h>
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#include <sys/wait.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/*
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* Signal handler which does nothing.
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*/
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static void
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ignoreit(int sig)
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{
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;
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}
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int
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main(int argc, char **argv)
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{
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char buf[1024], *cp;
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int desc, rv;
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long scval;
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sigset_t ss;
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struct sigaction sa;
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void *region;
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size_t psize;
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#ifndef _POSIX_SHARED_MEMORY_OBJECTS
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printf("_POSIX_SHARED_MEMORY_OBJECTS is undefined\n");
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#else
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printf("_POSIX_SHARED_MEMORY_OBJECTS is defined as %ld\n",
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(long)_POSIX_SHARED_MEMORY_OBJECTS - 0);
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if (_POSIX_SHARED_MEMORY_OBJECTS - 0 == -1)
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printf("***Indicates this feature may be unsupported!\n");
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#endif
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errno = 0;
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scval = sysconf(_SC_SHARED_MEMORY_OBJECTS);
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if (scval == -1 && errno != 0) {
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err(1, "sysconf(_SC_SHARED_MEMORY_OBJECTS)");
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} else {
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printf("sysconf(_SC_SHARED_MEMORY_OBJECTS) returns %ld\n",
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scval);
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if (scval == -1)
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printf("***Indicates this feature is unsupported!\n");
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}
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errno = 0;
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scval = sysconf(_SC_PAGESIZE);
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if (scval == -1 && errno != 0) {
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err(1, "sysconf(_SC_PAGESIZE)");
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} else if (scval <= 0 || (size_t)psize != psize) {
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warnx("bogus return from sysconf(_SC_PAGESIZE): %ld",
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scval);
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psize = 4096;
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} else {
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printf("sysconf(_SC_PAGESIZE) returns %ld\n", scval);
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psize = scval;
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}
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argc--, argv++;
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if (*argv) {
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strncat(buf, *argv, (sizeof buf) - 1);
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desc = shm_open(buf, O_EXCL | O_CREAT | O_RDWR, 0600);
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} else {
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do {
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/*
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* Can't use mkstemp for obvious reasons...
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*/
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strcpy(buf, "/tmp/shmtest.XXXXXXXXXXXX");
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mktemp(buf);
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desc = shm_open(buf, O_EXCL | O_CREAT | O_RDWR, 0600);
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} while (desc < 0 && errno == EEXIST);
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}
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if (desc < 0)
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err(1, "shm_open");
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if (shm_unlink(buf) < 0)
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err(1, "shm_unlink");
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if (ftruncate(desc, (off_t)psize) < 0)
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err(1, "ftruncate");
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region = mmap((void *)0, psize, PROT_READ | PROT_WRITE, MAP_SHARED,
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desc, (off_t)0);
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if (region == MAP_FAILED)
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err(1, "mmap");
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memset(region, '\377', psize);
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sa.sa_flags = 0;
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sa.sa_handler = ignoreit;
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sigemptyset(&sa.sa_mask);
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if (sigaction(SIGUSR1, &sa, (struct sigaction *)0) < 0)
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err(1, "sigaction");
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sigemptyset(&ss);
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sigaddset(&ss, SIGUSR1);
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if (sigprocmask(SIG_BLOCK, &ss, (sigset_t *)0) < 0)
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err(1, "sigprocmask");
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rv = fork();
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if (rv < 0) {
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err(1, "fork");
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} else if (rv == 0) {
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sigemptyset(&ss);
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sigsuspend(&ss);
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for (cp = region; cp < (char *)region + psize; cp++)
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if (*cp != '\151')
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_exit(1);
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_exit(0);
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} else {
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int status;
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memset(region, '\151', psize);
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kill(rv, SIGUSR1);
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waitpid(rv, &status, 0);
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if (WIFEXITED(status) && WEXITSTATUS(status) == 0) {
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printf("Functionality test successful\n");
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exit(0);
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} else if (WIFEXITED(status)) {
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printf("Child process exited with status %d\n",
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WEXITSTATUS(status));
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} else {
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printf("Child process terminated with %s\n",
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strsignal(WTERMSIG(status)));
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}
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}
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exit(1);
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}
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