1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
|
/*
*
* Copyright (c) International Business Machines Corp., 2001
*
* 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
*/
/*
* NAME
* fork04.c
*
* DESCRIPTION
* Check inheritance of file descriptor by children, they
* should all be refering to the same file.
*
* ALGORITHM
* Child reads several chars and exits.
* Parent forks another child, have the child and parent attempt to use
* that location
*
* USAGE
* fork04
*
* HISTORY
* 07/2001 Ported by Wayne Boyer
*
* RESTRICTIONS
* None
*/
#include <stdio.h>
#include <errno.h>
#include "test.h"
#include "usctest.h"
char *TCID = "fork04";
int TST_TOTAL = 1;
extern int Tst_count;
void setup(void);
void cleanup(void);
char pidbuf[10];
char fnamebuf[40];
main(int ac, char **av)
{
int status, pid, fildes;
char parchar[2];
char chilchar[2];
long lseek();
int lc; /* loop counter */
const char *msg; /* message returned from parse_opts */
/*
* parse standard options
*/
if ((msg = parse_opts(ac, av, (option_t *)NULL, NULL)) != (char *)NULL){
tst_brkm(TBROK, cleanup, "OPTION PARSING ERROR - %s", msg);
/*NOTREACHED*/
}
/*
* perform global setup for the test
*/
setup();
/*
* check looping state if -i option is given
*/
for (lc = 0; TEST_LOOPING(lc); lc++) {
/*
* reset Tst_count in case we are looping.
*/
Tst_count = 0;
if ((fildes = creat(fnamebuf, 0600)) < 0) {
tst_brkm(TBROK, cleanup, "Parent: cannot open %s for "
"write, errno = %d", fnamebuf, errno);
/*NOTREACHED*/
}
write(fildes, "ABCDEFGHIJKLMNOPQRSTUVWXYZ\n", 27);
close(fildes);
if ((fildes = open(fnamebuf, 0)) == -1) {
tst_brkm(TBROK, cleanup, "Parent: cannot open %s for "
"reading", fnamebuf);
/*NOTREACHED*/
}
if ((pid = fork()) == -1) {
tst_brkm(TBROK, cleanup, "fork() #1 failed");
/*NOTREACHED*/
}
if (pid == 0) { /* child */
tst_resm(TINFO, "fork child A");
if (lseek(fildes, 10L, 0) == -1L) {
tst_resm(TFAIL, "bad lseek by child");
exit(1);
}
exit(0);
} else { /* parent */
wait(&status);
/* parent starts second child */
if ((pid = fork()) == -1) {
tst_brkm(TBROK, cleanup, "fork() #2 failed");
/*NOTREACHED*/
}
if (pid == 0) { /* child */
if (read(fildes, chilchar, 1) <= 0) {
tst_resm(TFAIL, "Child can't read "
"file");
exit(1);
} else {
if (chilchar[0] != 'K') {
chilchar[1] = '\n';
exit(1);
} else {
exit(0);
}
}
} else { /* parent */
(void)wait(&status);
if (status >> 8 != 0) {
tst_resm(TFAIL, "Bad return from "
"second child");
continue;
}
/* parent reads */
if (read(fildes, parchar, 1) <= 0) {
tst_resm(TFAIL, "Parent cannot read "
"file");
continue;
} else {
write(fildes, parchar, 1);
if (parchar[0] != 'L') {
parchar[1] = '\n';
tst_resm(TFAIL, "Test failed");
continue;
}
}
}
}
tst_resm(TPASS, "test 1 PASSED");
close (fildes);
}
cleanup();
/*NOTREACHED*/
}
/*
* setup() - performs all ONE TIME setup for this test
*/
void
setup()
{
/*
* capture signals
*/
tst_sig(FORK, DEF_HANDLER, cleanup);
umask(0);
/*
* Pause if that option was specified
*/
TEST_PAUSE;
/*
* make a temp directory and cd to it
*/
tst_tmpdir();
strcpy(fnamebuf, "fork04.");
sprintf(pidbuf, "%d", getpid());
strcat(fnamebuf, pidbuf);
}
/*
* cleanup() - performs all ONE TIME cleanup for this test at
* completion or premature exit
*/
void
cleanup()
{
/*
* print timing stats if that option was specified.
* print errno log if that option was specified.
*/
TEST_CLEANUP;
/*
* remove tmp dir and all files in it
*/
tst_rmdir();
tst_exit();
}
|
