1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) International Business Machines  Corp., 2002
4 * Ported from SPIE, section2/iosuite/dup6.c, by Airong Zhang
5 */
6
7/*\
8 * [Description]
9 *
10 * Negative test for dup2() with max open file descriptors.
11 */
12
13#include <stdlib.h>
14#include <stdio.h>
15#include <unistd.h>
16#include "tst_test.h"
17#include "tst_safe_macros.h"
18
19static int *fildes;
20static int min;
21static char pfilname[40];
22
23static void setup(void)
24{
25	min = getdtablesize();	/* get number of files allowed open */
26	fildes = SAFE_MALLOC((min + 10) * sizeof(int));
27	memset(fildes, -1, (min + 10) * sizeof(int));
28	sprintf(pfilname, "./dup205.%d\n", getpid());
29}
30
31static void cleanup(void)
32{
33	if (fildes != NULL)
34		free(fildes);
35}
36
37static void run(void)
38{
39	int ifile = -1, rc = 0;
40
41	fildes[0] = SAFE_CREAT(pfilname, 0666);
42	fildes[fildes[0]] = fildes[0];
43	for (ifile = fildes[0] + 1; ifile < min + 10; ifile++) {
44		TEST(dup2(fildes[ifile - 1], ifile));
45		fildes[ifile] = TST_RET;
46		if (fildes[ifile] == -1)
47			break;
48		if (fildes[ifile] != ifile)
49			tst_brk(TFAIL,
50				"got wrong descriptor number back (%d != %d)",
51				fildes[ifile], ifile);
52	}
53
54	if (ifile < min) {
55		tst_res(TFAIL, "Not enough files duped");
56		rc++;
57	} else if (ifile > min) {
58		tst_res(TFAIL, "Too many files duped");
59		rc++;
60	}
61	if (TST_ERR != EBADF && TST_ERR != EMFILE && TST_ERR != EINVAL) {
62		tst_res(TFAIL, "bad errno on dup2 failure");
63		rc++;
64	}
65
66	if (rc)
67		tst_res(TFAIL, "Test failed");
68	else
69		tst_res(TPASS, "Test passed");
70
71	SAFE_UNLINK(pfilname);
72	for (ifile = fildes[0]; ifile < min + 10; ifile++) {
73		if (fildes[ifile] > 0)
74			SAFE_CLOSE(fildes[ifile]);
75	}
76}
77
78static struct tst_test test = {
79	.needs_tmpdir = 1,
80	.test_all = run,
81	.setup = setup,
82	.cleanup = cleanup,
83};
84