minix/test/ipc/shmt/shmt10.c

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2009-09-21 16:53:53 +02:00
/*
*
* Copyright (c) International Business Machines Corp., 2002
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
* the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
/* 12/20/2002 Port to LTP robbiew@us.ibm.com */
/* 06/30/2001 Port to Linux nsharoff@us.ibm.com */
/*
* NAME
* shmt10.c - test simultaneous shmat/shmdt
*
* CALLS
* shmget, shmat, shmdt, shmctl
*
* ALGORITHM
* Create a shared memory segment and fork a child. Both
* parent and child spin in a loop attaching and detaching
* the segment. After completing the specified number of
* iterations, the child exits and the parent deletes the
* segment.
*
* USAGE
* shmt10 [-i 500]
* -i # of iterations, default 500
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <stdlib.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
#define SIZE 0x32768
/** LTP Port **/
#include "test.h"
#include "usctest.h"
char *TCID="shmt10"; /* Test program identifier. */
int TST_TOTAL=2; /* Total number of test cases. */
extern int Tst_count; /* Test Case counter for tst_* routines */
/**************/
int shmid;
key_t key;
int child(int);
int rm_shm(int);
void fini(int);
int main(int argc, char *argv[])
{
char *c1=NULL;
int pid, st;
register int i;
int iter = 500;
int c;
extern char *optarg;
key = (key_t)getpid();
signal(SIGTERM, fini);
/*--------------------------------------------------------*/
while ((c = getopt(argc, argv, "i:")) != EOF) {
switch (c) {
case 'i':
iter = atoi(optarg);
break;
default:
tst_resm(TCONF, "usage: %s [-i <# iterations>]", argv[0]);
tst_exit();
}
}
/*------------------------------------------------------------------------*/
if ((shmid = shmget(key, SIZE, IPC_CREAT|0666)) < 0) {
tst_resm(TFAIL,"shmget") ;
tst_resm(TFAIL, "Error: shmid = %d\n", shmid) ;
tst_exit() ;
}
pid = fork();
switch(pid) {
case -1:
tst_resm(TBROK,"fork failed");
tst_exit() ;
case 0:
child(iter);
tst_exit();
}
for (i = 0; i < iter; i++) {
if ((c1 = (char *) shmat(shmid, (void *)0, 0)) == (char *)-1) {
tst_resm(TFAIL,
"Error shmat: iter %d, shmid = %d\n", i, shmid);
break;
}
if (shmdt(c1) < 0) {
tst_resm(TFAIL,
"Error: shmdt: iter %d ", i) ;
break;
}
}
while ( wait(&st) < 0 && errno == EINTR )
;
tst_resm(TPASS,"shmat,shmdt");
/*------------------------------------------------------------------------*/
rm_shm(shmid);
tst_exit();
/*------------------------------------------------------------------------*/
return(0);
}
int rm_shm(shmid)
int shmid ;
{
if (shmctl(shmid, IPC_RMID, NULL) == -1) {
perror("shmctl");
tst_resm(TFAIL,
"shmctl Failed to remove: shmid = %d, errno = %d\n",
shmid, errno) ;
tst_exit();
}
return(0);
}
int child(iter)
int iter;
{
register int i;
char *c1;
for (i = 0; i < iter; i++) {
if ((c1 = (char *) shmat(shmid, (void *)0, 0)) == (char *)-1) {
tst_resm(TFAIL,
"Error:child proc: shmat: iter %d, shmid = %d\n",
i, shmid);
tst_exit();
}
if (shmdt(c1) < 0) {
tst_resm(TFAIL,
"Error: child proc: shmdt: iter %d ", i);
tst_exit();
}
}
return(0);
}
void
fini(int sig)
{
rm_shm(shmid);
}