1 /*
2 *
3 * Copyright (c) International Business Machines Corp., 2001
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 /*
21 * NAME
22 * read04.c
23 *
24 * DESCRIPTION
25 * Testcase to check if read returns the number of bytes read correctly.
26 *
27 * ALGORITHM
28 * Create a file and write some bytes out to it.
29 * Attempt to read more than written.
30 * Check the return count, and the read buffer. The read buffer should be
31 * same as the write buffer.
32 *
33 * USAGE: <for command-line>
34 * read04 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
35 * where, -c n : Run n copies concurrently.
36 * -f : Turn off functionality Testing.
37 * -i n : Execute test n times.
38 * -I x : Execute test for x seconds.
39 * -P x : Pause for x seconds between iterations.
40 * -t : Turn on syscall timing.
41 *
42 * HISTORY
43 * 07/2001 Ported by Wayne Boyer
44 *
45 * RESTRICTIONS
46 * None
47 */
48 #include <sys/types.h>
49 #include <sys/stat.h>
50 #include <stdio.h>
51 #include <fcntl.h>
52 #include <errno.h>
53 #include "test.h"
54 #include "safe_macros.h"
55
56 void cleanup(void);
57 void setup(void);
58
59 char *TCID = "read04";
60 int TST_TOTAL = 1;
61
62 #define TST_SIZE 27 /* could also do strlen(palfa) */
63 char fname[255];
64 char palfa[] = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
65 int fild;
66
main(int ac,char ** av)67 int main(int ac, char **av)
68 {
69 int lc;
70
71 int rfild;
72 char prbuf[BUFSIZ];
73
74 /*
75 * parse standard options
76 */
77 tst_parse_opts(ac, av, NULL, NULL);
78
79 setup(); /* global setup for test */
80
81 for (lc = 0; TEST_LOOPING(lc); lc++) {
82
83 tst_count = 0; /* reset tst_count while looping */
84
85 if ((rfild = open(fname, O_RDONLY)) == -1) {
86 tst_brkm(TBROK, cleanup, "can't open for reading");
87 }
88 TEST(read(rfild, prbuf, BUFSIZ));
89
90 if (TEST_RETURN == -1) {
91 tst_resm(TFAIL, "call failed unexpectedly");
92 continue;
93 }
94
95 if (TEST_RETURN != TST_SIZE) {
96 tst_resm(TFAIL, "Bad read count - got %ld - "
97 "expected %d", TEST_RETURN, TST_SIZE);
98 continue;
99 }
100 if (memcmp(palfa, prbuf, TST_SIZE) != 0) {
101 tst_resm(TFAIL, "read buffer not equal "
102 "to write buffer");
103 continue;
104 }
105 tst_resm(TPASS, "functionality of read() is correct");
106
107 SAFE_CLOSE(cleanup, rfild);
108 }
109
110 cleanup();
111 tst_exit();
112 }
113
114 /*
115 * setup() - performs all ONE TIME setup for this test
116 */
setup(void)117 void setup(void)
118 {
119
120 tst_sig(NOFORK, DEF_HANDLER, cleanup);
121
122 umask(0);
123
124 TEST_PAUSE;
125
126 tst_tmpdir();
127
128 sprintf(fname, "tfile_%d", getpid());
129
130 if ((fild = creat(fname, 0777)) == -1) {
131 tst_brkm(TBROK, cleanup, "creat(%s, 0777) Failed, errno = %d"
132 " : %s", fname, errno, strerror(errno));
133 }
134 if (write(fild, palfa, TST_SIZE) != TST_SIZE) {
135 tst_brkm(TBROK, cleanup, "can't write to Xread");
136 }
137 close(fild);
138 }
139
140 /*
141 * cleanup() - performs all ONE TIME cleanup for this test at completion or
142 * premature exit.
143 */
cleanup(void)144 void cleanup(void)
145 {
146
147 unlink(fname);
148 tst_rmdir();
149
150 }
151