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 * fcntl12.c
23 *
24 * DESCRIPTION
25 * Testcase to test that fcntl() sets EMFILE for F_DUPFD command.
26 *
27 * ALGORITHM
28 * Get the size of the descriptor table of a process, by calling the
29 * getdtablesize() system call. Then attempt to use the F_DUPFD command
30 * for fcntl(), which should fail with EMFILE.
31 *
32 * USAGE
33 * fcntl12
34 *
35 * HISTORY
36 * 07/2001 Ported by Wayne Boyer
37 *
38 * RESTRICTIONS
39 * NONE
40 */
41
42 #include <fcntl.h>
43 #include <sys/types.h>
44 #include <sys/wait.h>
45 #include <errno.h>
46 #include "test.h"
47
48 char *TCID = "fcntl12";
49 int TST_TOTAL = 1;
50
51 int fail;
52 char fname[20];
53 void setup(void);
54 void cleanup(void);
55
main(int ac,char ** av)56 int main(int ac, char **av)
57 {
58 int lc;
59
60 pid_t pid;
61 int fd, i, status, max_files;
62
63 tst_parse_opts(ac, av, NULL, NULL);
64
65 setup();
66
67 /* check for looping state if -i option is given */
68 for (lc = 0; TEST_LOOPING(lc); lc++) {
69 tst_count = 0;
70
71 tst_resm(TINFO, "Test for errno EMFILE");
72 fail = 0;
73
74 pid = FORK_OR_VFORK();
75 if (pid < 0) {
76 tst_brkm(TBROK | TERRNO, cleanup, "Fork failed");
77 } else if (pid == 0) {
78 max_files = getdtablesize();
79 for (i = 0; i < max_files; i++) {
80 if ((fd = open(fname, O_CREAT | O_RDONLY,
81 0444)) == -1) {
82 break;
83 }
84 }
85
86 if (fcntl(1, F_DUPFD, 1) != -1) {
87 tst_resm(TFAIL, "fcntl failed to FAIL");
88 exit(1);
89 } else if (errno != EMFILE) {
90 tst_resm(TFAIL, "Expected EMFILE got %d",
91 errno);
92 exit(1);
93 }
94 exit(0);
95 }
96 waitpid(pid, &status, 0);
97 if (WEXITSTATUS(status) == 0)
98 tst_resm(TPASS, "block 1 PASSED");
99 else
100 tst_resm(TFAIL, "block 1 FAILED");
101 }
102 cleanup();
103 tst_exit();
104 }
105
setup(void)106 void setup(void)
107 {
108 tst_sig(FORK, DEF_HANDLER, cleanup);
109
110 TEST_PAUSE;
111
112 sprintf(fname, "fcnlt12.%d", getpid());
113 tst_tmpdir();
114 }
115
cleanup(void)116 void cleanup(void)
117 {
118 unlink(fname);
119 tst_rmdir();
120 }
121