/*
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/* 03/21/2003 enable ia64 Jacky.Malcles */
/* 12/20/2002 Port to LTP robbiew@us.ibm.com */
/* 06/30/2001 Port to Linux nsharoff@us.ibm.com */
/*
* NAME
* shmt04
*
* CALLS
* shmctl(2) shmget(2) shmat(2)
*
* ALGORITHM
* Parent process forks a child. Child pauses until parent has created
* a shared memory segment, attached to it and written to it too. At that
* time child gets the shared memory segment id, attaches to it and
* verifies that its contents are the same as the contents of the
* parent attached segment.
*
*/
#include <stdio.h>
#include <sys/types.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/wait.h>
#include <sys/utsname.h>
#include <signal.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
/** LTP Port **/
#include "test.h"
char *TCID = "shmt04"; /* Test program identifier. */
int TST_TOTAL = 2; /* Total number of test cases. */
/**************/
key_t key;
sigset_t set;
#define SIZE 16*1024
int child();
static int rm_shm(int);
int main(void)
{
char *cp = NULL;
int pid, pid1, shmid;
int status;
key = (key_t) getpid();
sigemptyset(&set);
sigaddset(&set, SIGUSR1);
sigprocmask(SIG_BLOCK, &set, NULL);
pid = fork();
switch (pid) {
case -1:
tst_brkm(TBROK, NULL, "fork failed");
case 0:
child();
}
/*----------------------------------------------------------*/
if ((shmid = shmget(key, SIZE, IPC_CREAT | 0666)) < 0) {
perror("shmget");
tst_resm(TFAIL, "Error: shmget: shmid = %d, errno = %d\n",
shmid, errno);
/*
* kill the child if parent failed to do the attach
*/
(void)kill(pid, SIGINT);
} else {
cp = shmat(shmid, NULL, 0);
if (cp == (char *)-1) {
perror("shmat");
tst_resm(TFAIL,
"Error: shmat: shmid = %d, errno = %d\n",
shmid, errno);
/* kill the child if parent failed to do the attch */
kill(pid, SIGINT);
/* remove shared memory segment */
rm_shm(shmid);
tst_exit();
}
*cp = 'A';
*(cp + 1) = 'B';
*(cp + 2) = 'C';
kill(pid, SIGUSR1);
while ((pid1 = wait(&status)) < 0 && (errno == EINTR)) ;
if (pid1 != pid) {
tst_resm(TFAIL, "Waited on the wrong child");
tst_resm(TFAIL,
"Error: wait_status = %d, pid1= %d\n", status,
pid1);
}
}
tst_resm(TPASS, "shmget,shmat");
/*----------------------------------------------------------*/
if (shmdt(cp) < 0) {
tst_resm(TFAIL, "shmdt");
}
tst_resm(TPASS, "shmdt");
/*----------------------------------------------------------*/
rm_shm(shmid);
tst_exit();
}
int child(void)
{
int shmid, chld_pid;
char *cp;
int sig;
sigwait(&set, &sig);
chld_pid = getpid();
/*--------------------------------------------------------*/
if ((shmid = shmget(key, SIZE, 0)) < 0) {
perror("shmget:child process");
tst_resm(TFAIL,
"Error: shmget: errno=%d, shmid=%d, child_pid=%d\n",
errno, shmid, chld_pid);
} else {
cp = shmat(shmid, NULL, 0);
if (cp == (char *)-1) {
perror("shmat:child process");
tst_resm(TFAIL,
"Error: shmat: errno=%d, shmid=%d, child_pid=%d\n",
errno, shmid, chld_pid);
} else {
if (*cp != 'A') {
tst_resm(TFAIL, "child: not A\n");
}
if (*(cp + 1) != 'B') {
tst_resm(TFAIL, "child: not B\n");
}
if (*(cp + 2) != 'C') {
tst_resm(TFAIL, "child: not C\n");
}
if (*(cp + 8192) != 0) {
tst_resm(TFAIL, "child: not 0\n");
}
}
}
tst_exit();
}
static int rm_shm(int shmid)
{
if (shmctl(shmid, IPC_RMID, NULL) == -1) {
perror("shmctl");
tst_brkm(TFAIL,
NULL,
"shmctl Failed to remove: shmid = %d, errno = %d\n",
shmid, errno);
}
return (0);
}