newlib-cygwin/winsup/testsuite/winsup.api/semtest.c

349 lines
8.7 KiB
C

/*-
* 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.
*
* Obtained from: $NetBSD: semtest.c,v 1.4 2002/07/20 08:36:25 grant Exp $
* $FreeBSD: /repoman/r/ncvs/src/tools/regression/sysvsem/semtest.c,v 1.1 2002/08/15 06:34:37 alfred Exp $
*/
/*
* Test the SVID-compatible Semaphore facility.
*/
/*
* CV, 2003-11-17: Add to Cygwin testsuite.
*/
#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 "test.h"
#include "usctest.h"
const char *TCID = "semtest"; /* Test program identifier. */
int TST_TOTAL = 54; /* Total number of test cases. */
extern int Tst_count; /* Test Case counter for tst_* routines */
int main (int, char *[]);
void print_semid_ds (struct semid_ds *, mode_t);
void sigsys_handler (int);
void sigchld_handler(int);
void cleanup (void);
void waiter (void);
int sender_semid = -1;
pid_t child_pid;
int child_count;
int signal_was_sigchld;
key_t semkey;
/*
* This is the original semun union used by the sysvsem utility.
* It is deliberately kept here under #if 0'ed condition for future
* reference. PLEASE DO NOT REMOVE. The {SET,GET}ALL in FreeBSD
* are signed values, so the default version in sys/sem.h suffices.
*/
#if 1 /*0*/
union semun {
int val; /* value for SETVAL */
struct semid_ds *buf; /* buffer for IPC_{STAT,SET} */
u_short *array; /* array for GETALL & SETALL */
};
#endif
int
main(int argc, char *argv[])
{
struct sigaction sa;
union semun sun;
struct semid_ds s_ds;
sigset_t sigmask;
int i;
Tst_count = 0;
/*
* 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)
tst_brkm (TBROK, cleanup, "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)
tst_brkm (TBROK, cleanup, "sigaction SIGCHLD");
semkey = ftok("/", 4160);
tst_resm (semkey == (key_t)-1 ? TFAIL : TPASS,
"ftok(\"/\") returns valid value");
/*
* Initialize child_pid to ourselves to that the cleanup function
* works before we create the receiver.
*/
child_pid = getpid();
sender_semid = semget(semkey, 1, IPC_CREAT | 0640);
tst_resm (sender_semid == -1 ? TFAIL : TPASS, "sender calls semget");
sun.buf = &s_ds;
tst_resm (semctl(sender_semid, 0, IPC_STAT, sun) == -1 ? TFAIL : TPASS,
"semctl IPC_STAT");
print_semid_ds(&s_ds, 0640);
s_ds.sem_perm.mode = (s_ds.sem_perm.mode & ~0777) | 0600;
sun.buf = &s_ds;
tst_resm (semctl(sender_semid, 0, IPC_SET, sun) == -1 ? TFAIL : TPASS,
"semctl IPC_SET");
memset(&s_ds, 0, sizeof(s_ds));
sun.buf = &s_ds;
tst_resm (semctl(sender_semid, 0, IPC_STAT, sun) == -1 ? TFAIL : TPASS,
"semctl IPC_STAT");
tst_resm ((s_ds.sem_perm.mode & 0777) != 0600 ? TFAIL : TPASS,
"IPC_SET of mode holds");
print_semid_ds(&s_ds, 0600);
for (child_count = 0; child_count < 5; child_count++) {
switch ((child_pid = fork())) {
case -1:
tst_brkm (TBROK, cleanup, "fork");
/* NOTREACHED */
case 0:
Tst_count += 22 + child_count * 4;
tst_resm (TPASS, "fork");
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)
tst_brkm (TBROK, cleanup, "semctl GETNCNT");
if (i == 5)
break;
}
/*
* Now set the thundering herd in motion by initializing the
* semaphore to the value 1.
*/
sun.val = 1;
tst_resm (semctl(sender_semid, 0, SETVAL, sun) == -1 ? TFAIL : TPASS,
"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.
*/
tst_brkm (TBROK, cleanup, "sender: received unexpected signal");
exit (1);
}
void
sigsys_handler(int signo)
{
tst_brkm (TBROK, cleanup,
"System V Semaphore support is not present in the kernel");
}
void
sigchld_handler(int signo)
{
union semun 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)
tst_brkm (TBROK, cleanup, "wait");
if (WIFEXITED(cstatus) == 0)
tst_brkm (TBROK, cleanup, "receiver exited abnormally");
if (WEXITSTATUS(cstatus) != 0)
tst_brkm (TBROK, cleanup, "receiver exited with status %d",
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;
tst_resm (semctl(sender_semid, 0, IPC_STAT, sun) == -1 ? TFAIL : TPASS,
"semctl IPC_STAT");
print_semid_ds(&s_ds, 0600);
if (--child_count != 0) {
signal_was_sigchld = 1;
return;
}
cleanup ();
}
void
cleanup()
{
/*
* If we're the sender, and it exists, remove the message queue.
*/
if (child_pid != 0 && sender_semid != -1) {
tst_resm (semctl(sender_semid, 0, IPC_RMID) == -1
? TFAIL : TPASS, "semctl IPC_RMID");
}
tst_exit ();
}
void
print_semid_ds(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",
(int)sp->sem_perm.uid, (int)sp->sem_perm.gid,
(int)sp->sem_perm.cuid, (int)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.
*/
tst_resm (sp->sem_perm.uid != uid || sp->sem_perm.cuid != uid
? TFAIL : TPASS, "uid matches");
tst_resm (sp->sem_perm.gid != gid || sp->sem_perm.cgid != gid
? TFAIL : TPASS, "gid matches");
tst_resm ((sp->sem_perm.mode & 0777) != mode
? TFAIL : TPASS, "mode matches");
}
void
waiter()
{
struct sembuf s;
int semid;
tst_resm ((semid = semget(semkey, 1, 0)) == -1 ? TFAIL : TPASS,
"waiter: semget");
/*
* Attempt to acquire the semaphore.
*/
s.sem_num = 0;
s.sem_op = -1;
s.sem_flg = SEM_UNDO;
tst_resm (semop(semid, &s, 1) == -1 ? TFAIL : TPASS,
"waiter: semop -1");
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;
tst_resm (semop(semid, &s, 1) == -1 ? TFAIL : TPASS,
"waiter: semop +1");
/* Allow parent to receive message before getting SIGCHLD. */
sleep (1);
exit(0);
}