1 /*
2 * Copyright (c) International Business Machines Corp., 2001
3 * 07/2001 Ported by Wayne Boyer
4 *
5 * Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
15 * the GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /*
23 * DESCRIPTION
24 * Testcase to check the basic functionality of the readv(2) system call.
25 *
26 * ALGORITHM
27 * Create a IO vector, and attempt to readv() various components of it.
28 */
29 #include <stdlib.h>
30 #include <sys/types.h>
31 #include <sys/uio.h>
32 #include <fcntl.h>
33 #include <memory.h>
34 #include <errno.h>
35
36 #include "test.h"
37 #include "safe_macros.h"
38
39 #define CHUNK 64
40
41 char *TCID = "readv01";
42 int TST_TOTAL = 1;
43
44 static char buf[CHUNK];
45
46 static struct iovec rd_iovec[] = {
47 {buf, CHUNK},
48 {NULL, 0},
49 {NULL, 0},
50 };
51
52 static int fd;
53
54 static void setup(void);
55 static void cleanup(void);
56
main(int ac,char ** av)57 int main(int ac, char **av)
58 {
59 int lc, i, fail;
60 char *vec;
61
62 tst_parse_opts(ac, av, NULL, NULL);
63
64 setup();
65
66 for (lc = 0; TEST_LOOPING(lc); lc++) {
67 tst_count = 0;
68
69 SAFE_LSEEK(cleanup, fd, 0, SEEK_SET);
70
71 if (readv(fd, rd_iovec, 0) == -1)
72 tst_resm(TFAIL | TERRNO, "readv failed unexpectedly");
73 else
74 tst_resm(TPASS, "readv read 0 io vectors");
75
76 memset(rd_iovec[0].iov_base, 0x00, CHUNK);
77
78 if (readv(fd, rd_iovec, 3) != CHUNK) {
79 tst_resm(TFAIL, "readv failed reading %d bytes, "
80 "followed by two NULL vectors", CHUNK);
81 } else {
82 fail = 0;
83 vec = rd_iovec[0].iov_base;
84
85 for (i = 0; i < CHUNK; i++) {
86 if (vec[i] != 0x42)
87 fail++;
88 }
89
90 if (fail)
91 tst_resm(TFAIL, "Wrong buffer content");
92 else
93 tst_resm(TPASS, "readv passed reading %d bytes "
94 "followed by two NULL vectors", CHUNK);
95 }
96 }
97
98 cleanup();
99 tst_exit();
100 }
101
setup(void)102 static void setup(void)
103 {
104 tst_sig(NOFORK, DEF_HANDLER, cleanup);
105
106 TEST_PAUSE;
107
108 tst_tmpdir();
109
110 memset(buf, 0x42, sizeof(buf));
111
112 fd = SAFE_OPEN(cleanup, "data_file", O_WRONLY | O_CREAT, 0666);
113 SAFE_WRITE(cleanup, 1, fd, buf, sizeof(buf));
114 SAFE_CLOSE(cleanup, fd);
115 fd = SAFE_OPEN(cleanup, "data_file", O_RDONLY);
116 }
117
cleanup(void)118 static void cleanup(void)
119 {
120 if (fd > 0)
121 close(fd);
122
123 tst_rmdir();
124 }
125