1 /*
2 * Copyright (c) International Business Machines Corp., 2002
3 * ported from SPIE, section2/iosuite/dup1.c, by Airong Zhang
4 * Copyright (c) 2013 Cyril Hrubis <chrubis@suse.cz>
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
14 * the GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 /*
22 WHAT: Does dup return -1 on the 21st file?
23 HOW: Create up to _NFILE (20) files and check for -1 return on the
24 next attempt
25 Should check NOFILE as well as _NFILE. 19-Jun-84 Dale.
26 */
27
28 #include <stdio.h>
29 #include <fcntl.h>
30 #include <errno.h>
31 #include <unistd.h>
32 #include <sys/types.h>
33 #include <sys/stat.h>
34 #include <sys/param.h>
35 #include "test.h"
36
37 char *TCID = "dup06";
38 int TST_TOTAL = 1;
39
cnt_free_fds(int maxfd)40 static int cnt_free_fds(int maxfd)
41 {
42 int freefds = 0;
43
44 for (maxfd--; maxfd >= 0; maxfd--)
45 if (fcntl(maxfd, F_GETFD) == -1 && errno == EBADF)
46 freefds++;
47
48 return (freefds);
49 }
50
51 static void setup(void);
52 static void cleanup(void);
53
main(int ac,char ** av)54 int main(int ac, char **av)
55 {
56 int *fildes, i;
57 int min;
58 int freefds;
59 int lc;
60 const char *pfilname = "dup06";
61
62 tst_parse_opts(ac, av, NULL, NULL);
63
64 setup();
65
66 min = getdtablesize();
67 freefds = cnt_free_fds(min);
68 fildes = malloc((min + 5) * sizeof(int));
69
70 for (i = 0; i < min + 5; i++)
71 fildes[i] = 0;
72
73 for (lc = 0; TEST_LOOPING(lc); lc++) {
74 unlink(pfilname);
75
76 if ((fildes[0] = creat(pfilname, 0666)) == -1) {
77 tst_resm(TFAIL, "Cannot open first file");
78 } else {
79 for (i = 1; i < min + 5; i++) {
80 if ((fildes[i] = dup(fildes[i - 1])) == -1)
81 break;
82 }
83 if (i < freefds) {
84 tst_resm(TFAIL, "Not enough files duped");
85 } else if (i > freefds) {
86 tst_resm(TFAIL, "Too many files duped");
87 } else {
88 tst_resm(TPASS, "Test passed.");
89 }
90 }
91
92 unlink(pfilname);
93
94 for (i = 0; i < min + 5; i++) {
95 if (fildes[i] != 0 && fildes[i] != -1)
96 close(fildes[i]);
97
98 fildes[i] = 0;
99 }
100 }
101
102 cleanup();
103 tst_exit();
104 }
105
setup(void)106 static void setup(void)
107 {
108 tst_tmpdir();
109 }
110
cleanup(void)111 static void cleanup(void)
112 {
113 tst_rmdir();
114 }
115