1/*
2 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
3 *  AUTHOR		: Richard Logan
4 *  CO-PILOT		: William Roske
5 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
6 *
7 * This program is free software; you can redistribute it and/or modify it
8 * under the terms of version 2 of the GNU General Public License as
9 * published by the Free Software Foundation.
10 *
11 * This program is distributed in the hope that it would be useful, but
12 * WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
14 *
15 * Further, this software is distributed without any warranty that it is
16 * free of the rightful claim of any third person regarding infringement
17 * or the like.  Any license provided herein, whether implied or
18 * otherwise, applies only to this software file.  Patent licenses, if
19 * any, provided herein do not apply to combinations of this program with
20 * other software, or any other product whatsoever.
21 *
22 * You should have received a copy of the GNU General Public License along
23 * with this program; if not, write the Free Software Foundation, Inc.,
24 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
25 *
26 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
27 * Mountain View, CA  94043, or:
28 *
29 * http://www.sgi.com
30 *
31 * For further information regarding this notice, see:
32 *
33 * http://oss.sgi.com/projects/GenInfo/NoticeExplan/
34 *
35 */
36
37 /*
38  * Tests that link(2) succeds with creating n links.
39  */
40
41#include <sys/types.h>
42#include <fcntl.h>
43#include <sys/stat.h>
44#include <errno.h>
45#include <string.h>
46#include <signal.h>
47#include "test.h"
48#include "safe_macros.h"
49
50static void setup(void);
51static void help(void);
52static void cleanup(void);
53
54char *TCID = "link03";
55int TST_TOTAL = 2;
56
57#define BASENAME	"lkfile"
58
59static char fname[255];
60static int nlinks = 0;
61static char *links_arg;
62
63option_t options[] = {
64	{"N:", NULL, &links_arg},
65	{NULL, NULL, NULL}
66};
67
68int main(int ac, char **av)
69{
70	int lc;
71	struct stat buf;
72	int i, links;
73	char lname[255];
74
75	tst_parse_opts(ac, av, options, &help);
76
77	if (links_arg) {
78		nlinks = atoi(links_arg);
79
80		if (nlinks == 0) {
81			tst_brkm(TBROK, NULL,
82			         "nlinks is not a positive number");
83		}
84
85		if (nlinks > 1000) {
86			tst_resm(TINFO,
87				 "nlinks > 1000 - may get errno:%d (EMLINK)",
88				 EMLINK);
89		}
90	}
91
92	setup();
93
94	for (lc = 0; TEST_LOOPING(lc); lc++) {
95		tst_count = 0;
96
97		if (nlinks)
98			links = nlinks;
99		else
100			links = (lc % 90) + 10;
101
102		/* Create links - 1 hardlinks so that the st_nlink == links */
103		for (i = 1; i < links; i++) {
104			sprintf(lname, "%s%d", fname, i);
105			TEST(link(fname, lname));
106
107			if (TEST_RETURN == -1) {
108				tst_brkm(TFAIL | TTERRNO, cleanup,
109					 "link(%s, %s) Failed", fname, lname);
110			}
111		}
112
113		SAFE_STAT(cleanup, fname, &buf);
114
115		if (buf.st_nlink != (nlink_t)links) {
116			tst_resm(TFAIL, "Wrong number of links for "
117			         "'%s' have %i, should be %i",
118				 fname, (int)buf.st_nlink, links);
119			goto unlink;
120		}
121
122		for (i = 1; i < links; i++) {
123			sprintf(lname, "%s%d", fname, i);
124			SAFE_STAT(cleanup, lname, &buf);
125			if (buf.st_nlink != (nlink_t)links) {
126				tst_resm(TFAIL,
127				         "Wrong number of links for "
128					 "'%s' have %i, should be %i",
129					 lname, (int)buf.st_nlink, links);
130				goto unlink;
131			}
132		}
133
134		tst_resm(TPASS, "link() passed and linkcounts=%d match", links);
135
136unlink:
137		for (i = 1; i < links; i++) {
138			sprintf(lname, "%s%d", fname, i);
139			SAFE_UNLINK(cleanup, lname);
140		}
141	}
142
143	cleanup();
144	tst_exit();
145}
146
147static void help(void)
148{
149	printf("  -N #links : create #links hard links every iteration\n");
150}
151
152static void setup(void)
153{
154	tst_sig(NOFORK, DEF_HANDLER, cleanup);
155
156	TEST_PAUSE;
157
158	tst_tmpdir();
159
160	sprintf(fname, "%s_%d", BASENAME, getpid());
161	SAFE_TOUCH(cleanup, fname, 0700, NULL);
162}
163
164static void cleanup(void)
165{
166	tst_rmdir();
167}
168