Test sysv semaphores. From NetBSD with changes.

2 files changed, 365 insertions, 0 deletions

diff --git a/regress/sys/kern/sysvsem/Makefile b/regress/sys/kern/sysvsem/Makefile
new file mode 100644
index 00000000000..1cf5c9cc0b5
--- /dev/null
+++ b/regress/sys/kern/sysvsem/Makefile
@@ -0,0 +1,5 @@
+#	$OpenBSD: Makefile,v 1.1 2002/02/16 14:24:07 art Exp $
+
+PROG=semtest
+
+.include <bsd.regress.mk>
diff --git a/regress/sys/kern/sysvsem/semtest.c b/regress/sys/kern/sysvsem/semtest.c
new file mode 100644
index 00000000000..dbe3e146491
--- /dev/null
+++ b/regress/sys/kern/sysvsem/semtest.c
@@ -0,0 +1,360 @@
+/*	$NetBSD: semtest.c,v 1.3 2001/02/19 22:44:41 cgd Exp $	*/
+
+/*-
+ * Copyright (c) 1999 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Jason R. Thorpe of the Numerical Aerospace Simulation Facility,
+ * NASA Ames Research Center.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/*
+ * Test the SVID-compatible Semaphore facility.
+ */
+
+#include <sys/param.h>
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sys/wait.h>
+
+#include <err.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <time.h>
+#include <unistd.h>
+
+int	main __P((int, char *[]));
+void	print_semid_ds __P((struct semid_ds *, mode_t));
+void	sigsys_handler __P((int));
+void	sigchld_handler __P((int));
+void	cleanup __P((void));
+void	waiter __P((void));
+
+int	sender_semid = -1;
+pid_t	child_pid;
+int	child_count;
+volatile sig_atomic_t signal_was_sigchld;
+
+key_t	semkey;
+
+char keyname[] = "/tmp/msgtestXXXXXXXX";
+
+int verbose;
+
+union mysemun {
+	int	val;		/* value for SETVAL */
+	struct	semid_ds *buf;	/* buffer for IPC_{STAT,SET} */
+	u_short	*array;		/* array for GETALL & SETALL */
+};
+
+int
+main(argc, argv)
+	int argc;
+	char *argv[];
+{
+	struct sigaction sa;
+	union mysemun sun;
+	struct semid_ds s_ds;
+	sigset_t sigmask;
+	int i;
+
+	int fd, ch;
+
+	if ((fd = mkstemp(keyname)) < 0)
+		err(1, "mkstemp");
+
+	close(fd);
+
+	while ((ch = getopt(argc, argv, "v")) != -1) {
+		switch (ch) {
+		case 'v':
+			verbose = 1;
+			break;
+		default:
+			fprintf(stderr, "Usage: semtest [-v]\n");
+			exit(1);
+		}
+	}
+
+	/*
+	 * Install a SIGSYS handler so that we can exit gracefully if
+	 * System V Semaphore support isn't in the kernel.
+	 */
+	sa.sa_handler = sigsys_handler;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = 0;
+	if (sigaction(SIGSYS, &sa, NULL) == -1)
+		err(1, "sigaction SIGSYS");
+
+	/*
+	 * Install and SIGCHLD handler to deal with all possible exit
+	 * conditions of the receiver.
+	 */
+	sa.sa_handler = sigchld_handler;
+	sigemptyset(&sa.sa_mask);
+	sa.sa_flags = 0;
+	if (sigaction(SIGCHLD, &sa, NULL) == -1)
+		err(1, "sigaction SIGCHLD");
+
+	semkey = ftok(keyname, 4160);
+
+	/*
+	 * Initialize child_pid to ourselves to that the cleanup function
+	 * works before we create the receiver.
+	 */
+	child_pid = getpid();
+
+	/*
+	 * Make sure that when the sender exits, the message queue is
+	 * removed.
+	 */
+	if (atexit(cleanup) == -1)
+		err(1, "atexit");
+
+	if ((sender_semid = semget(semkey, 1, IPC_CREAT | 0640)) == -1)
+		err(1, "semget");
+
+	
+	sun.buf = &s_ds;
+	if (semctl(sender_semid, 0, IPC_STAT, sun) == -1)
+		err(1, "semctl IPC_STAT");
+
+	if (verbose)
+		print_semid_ds(&s_ds, 0640);
+
+	s_ds.sem_perm.mode = (s_ds.sem_perm.mode & ~0777) | 0600;
+
+	sun.buf = &s_ds;
+	if (semctl(sender_semid, 0, IPC_SET, sun) == -1)
+		err(1, "semctl IPC_SET");
+
+	memset(&s_ds, 0, sizeof(s_ds));
+
+	sun.buf = &s_ds;
+	if (semctl(sender_semid, 0, IPC_STAT, sun) == -1)
+		err(1, "semctl IPC_STAT");
+
+	if ((s_ds.sem_perm.mode & 0777) != 0600)
+		err(1, "IPC_SET of mode didn't hold");
+
+	if (verbose)
+		print_semid_ds(&s_ds, 0600);
+
+	for (child_count = 0; child_count < 5; child_count++) {
+		switch ((child_pid = fork())) {
+		case -1:
+			err(1, "fork");
+			/* NOTREACHED */
+
+		case 0:
+			waiter();
+			break;
+
+		default:
+			break;
+		}
+	}
+
+	/*
+	 * Wait for all of the waiters to be attempting to acquire the
+	 * semaphore.
+	 */
+	for (;;) {
+		i = semctl(sender_semid, 0, GETNCNT);
+		if (i == -1)
+			err(1, "semctl GETNCNT");
+		if (i == 5)
+			break;
+	}
+
+	/*
+	 * Now set the thundering herd in motion by initializing the
+	 * semaphore to the value 1.
+	 */
+	sun.val = 1;
+	if (semctl(sender_semid, 0, SETVAL, sun) == -1)
+		err(1, "sender: semctl SETVAL to 1");
+
+	/*
+	 * Suspend forever; when we get SIGCHLD, the handler will exit.
+	 */
+	sigemptyset(&sigmask);
+	for (;;) {
+		(void) sigsuspend(&sigmask);
+		if (signal_was_sigchld)
+			signal_was_sigchld = 0;
+		else
+			break;
+	}
+
+	/*
+	 * ...and any other signal is an unexpected error.
+	 */
+	errx(1, "sender: received unexpected signal");
+}
+
+void
+sigsys_handler(signo)
+	int signo;
+{
+
+	errx(1, "System V Semaphore support is not present in the kernel");
+}
+
+void
+sigchld_handler(signo)
+	int signo;
+{
+	union mysemun sun;
+	struct semid_ds s_ds;
+	int cstatus;
+
+	/*
+	 * Reap the child; if it exited successfully, then we're on the
+	 * right track!
+	 */
+	if (wait(&cstatus) == -1)
+		err(1, "wait");
+
+	if (WIFEXITED(cstatus) == 0)
+		errx(1, "receiver exited abnormally");
+
+	if (WEXITSTATUS(cstatus) != 0)
+		errx(1, "receiver exited with status %d\n",
+		    WEXITSTATUS(cstatus));
+
+	/*
+	 * If we get here, the child has exited normally, and we should
+	 * decrement the child count.  If the child_count reaches 0, we
+	 * should exit.
+	 */
+
+	sun.buf = &s_ds;
+	if (semctl(sender_semid, 0, IPC_STAT, sun) == -1)
+		err(1, "semctl IPC_STAT");
+
+	if (verbose)
+		print_semid_ds(&s_ds, 0600);
+
+	if (--child_count != 0) {
+		signal_was_sigchld = 1;
+		return;
+	}
+
+	exit(0);
+}
+
+void
+cleanup()
+{
+
+	/*
+	 * If we're the sender, and it exists, remove the message queue.
+	 */
+	if (child_pid != 0 && sender_semid != -1) {
+		if (semctl(sender_semid, 0, IPC_RMID) == -1)
+			warn("semctl IPC_RMID");
+	}
+	remove(keyname);
+}
+
+void
+print_semid_ds(sp, mode)
+	struct semid_ds *sp;
+	mode_t mode;
+{
+	uid_t uid = geteuid();
+	gid_t gid = getegid();
+
+	printf("PERM: uid %d, gid %d, cuid %d, cgid %d, mode 0%o\n",
+	    sp->sem_perm.uid, sp->sem_perm.gid,
+	    sp->sem_perm.cuid, sp->sem_perm.cgid,
+	    sp->sem_perm.mode & 0777);
+
+	printf("nsems %u\n", sp->sem_nsems);
+
+	printf("otime: %s", ctime(&sp->sem_otime));
+	printf("ctime: %s", ctime(&sp->sem_ctime));
+
+	/*
+	 * Sanity check a few things.
+	 */
+
+	if (sp->sem_perm.uid != uid || sp->sem_perm.cuid != uid)
+		errx(1, "uid mismatch");
+
+	if (sp->sem_perm.gid != gid || sp->sem_perm.cgid != gid)
+		errx(1, "gid mismatch");
+
+	if ((sp->sem_perm.mode & 0777) != mode)
+		errx(1, "mode mismatch %o != %o",
+		    (sp->sem_perm.mode & 0777), mode);
+}
+
+void
+waiter()
+{
+	struct sembuf s;
+	int semid;
+
+	if ((semid = semget(semkey, 1, 0)) == -1)
+		err(1, "waiter: semget");
+
+	/*
+	 * Attempt to acquire the semaphore.
+	 */
+	s.sem_num = 0;
+	s.sem_op = -1;
+	s.sem_flg = SEM_UNDO;
+
+	if (semop(semid, &s, 1) == -1)
+		err(1, "waiter: semop -1");
+
+	if (verbose)
+		printf("WOO!  GOT THE SEMAPHORE!\n");
+	sleep(1);
+
+	/*
+	 * Release the semaphore and exit.
+	 */
+	s.sem_num = 0;
+	s.sem_op = 1;
+	s.sem_flg = SEM_UNDO;
+
+	if (semop(semid, &s, 1) == -1)
+		err(1, "waiter: semop +1");
+
+	exit(0);
+}