1/*
2 *
3 *   Copyright (c) International Business Machines  Corp., 2002
4 *
5 *   This program is free software;  you can redistribute it and/or modify
6 *   it under the terms of the GNU General Public License as published by
7 *   the Free Software Foundation; either version 2 of the License, or
8 *   (at your option) any later version.
9 *
10 *   This program is distributed in the hope that it will be useful,
11 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
12 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
13 *   the GNU General Public License for more details.
14 *
15 *   You should have received a copy of the GNU General Public License
16 *   along with this program;  if not, write to the Free Software
17 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20/* 03/21/2003   enable ia64     Jacky.Malcles */
21/* 12/20/2002   Port to LTP     robbiew@us.ibm.com */
22/* 06/30/2001   Port to Linux   nsharoff@us.ibm.com */
23
24/*
25 * NAME
26 *		 shmt04
27 *
28 * CALLS
29 *		 shmctl(2) shmget(2) shmat(2)
30 *
31 * ALGORITHM
32 * Parent process forks a child. Child pauses until parent has created
33 * a shared memory segment, attached to it and written to it too. At that
34 * time child gets the shared memory segment id, attaches to it and
35 * verifies that its contents are the same as the contents of the
36 * parent attached segment.
37 *
38 */
39
40#include <stdio.h>
41#include <sys/types.h>
42#include <sys/ipc.h>
43#include <sys/shm.h>
44#include <sys/wait.h>
45#include <sys/utsname.h>
46#include <signal.h>
47#include <errno.h>
48#include <stdlib.h>
49#include <unistd.h>
50
51/** LTP Port **/
52#include "test.h"
53
54char *TCID = "shmt04";		/* Test program identifier.    */
55int TST_TOTAL = 2;		/* Total number of test cases. */
56/**************/
57
58key_t key;
59sigset_t set;
60
61#define  SIZE  16*1024
62
63int child();
64static int rm_shm(int);
65
66int main(void)
67{
68	char *cp = NULL;
69	int pid, pid1, shmid;
70	int status;
71
72	key = (key_t) getpid();
73
74	sigemptyset(&set);
75	sigaddset(&set, SIGUSR1);
76	sigprocmask(SIG_BLOCK, &set, NULL);
77
78	pid = fork();
79	switch (pid) {
80	case -1:
81		tst_brkm(TBROK, NULL, "fork failed");
82	case 0:
83		child();
84	}
85
86/*----------------------------------------------------------*/
87
88	if ((shmid = shmget(key, SIZE, IPC_CREAT | 0666)) < 0) {
89		perror("shmget");
90		tst_resm(TFAIL, "Error: shmget: shmid = %d, errno = %d\n",
91			 shmid, errno);
92		/*
93		 * kill the child if parent failed to do the attach
94		 */
95		(void)kill(pid, SIGINT);
96	} else {
97		cp = shmat(shmid, NULL, 0);
98
99		if (cp == (char *)-1) {
100			perror("shmat");
101			tst_resm(TFAIL,
102				 "Error: shmat: shmid = %d, errno = %d\n",
103				 shmid, errno);
104
105/* kill the child if parent failed to do the attch */
106
107			kill(pid, SIGINT);
108
109/* remove shared memory segment */
110
111			rm_shm(shmid);
112
113			tst_exit();
114		}
115		*cp = 'A';
116		*(cp + 1) = 'B';
117		*(cp + 2) = 'C';
118
119		kill(pid, SIGUSR1);
120		while ((pid1 = wait(&status)) < 0 && (errno == EINTR)) ;
121		if (pid1 != pid) {
122			tst_resm(TFAIL, "Waited on the wrong child");
123			tst_resm(TFAIL,
124				 "Error: wait_status = %d, pid1= %d\n", status,
125				 pid1);
126		}
127	}
128
129	tst_resm(TPASS, "shmget,shmat");
130
131/*----------------------------------------------------------*/
132
133	if (shmdt(cp) < 0) {
134		tst_resm(TFAIL, "shmdt");
135	}
136
137	tst_resm(TPASS, "shmdt");
138
139/*----------------------------------------------------------*/
140
141	rm_shm(shmid);
142	tst_exit();
143}
144
145int child(void)
146{
147	int shmid, chld_pid;
148	char *cp;
149	int sig;
150
151	sigwait(&set, &sig);
152	chld_pid = getpid();
153/*--------------------------------------------------------*/
154
155	if ((shmid = shmget(key, SIZE, 0)) < 0) {
156		perror("shmget:child process");
157		tst_resm(TFAIL,
158			 "Error: shmget: errno=%d, shmid=%d, child_pid=%d\n",
159			 errno, shmid, chld_pid);
160	} else {
161		cp = shmat(shmid, NULL, 0);
162
163		if (cp == (char *)-1) {
164			perror("shmat:child process");
165			tst_resm(TFAIL,
166				 "Error: shmat: errno=%d, shmid=%d, child_pid=%d\n",
167				 errno, shmid, chld_pid);
168		} else {
169			if (*cp != 'A') {
170				tst_resm(TFAIL, "child: not A\n");
171			}
172			if (*(cp + 1) != 'B') {
173				tst_resm(TFAIL, "child: not B\n");
174			}
175			if (*(cp + 2) != 'C') {
176				tst_resm(TFAIL, "child: not C\n");
177			}
178			if (*(cp + 8192) != 0) {
179				tst_resm(TFAIL, "child: not 0\n");
180			}
181		}
182
183	}
184	tst_exit();
185}
186
187static int rm_shm(int shmid)
188{
189	if (shmctl(shmid, IPC_RMID, NULL) == -1) {
190		perror("shmctl");
191		tst_brkm(TFAIL,
192			 NULL,
193			 "shmctl Failed to remove: shmid = %d, errno = %d\n",
194			 shmid, errno);
195	}
196	return (0);
197}
198