1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
4 *  AUTHOR		: Richard Logan
5 *  CO-PILOT		: William Roske
6 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
7 */
8
9/*
10 * Test if link(2) fails with EMLINK.
11 */
12
13#include <stdio.h>
14#include <sys/stat.h>
15#include "tst_test.h"
16
17#define BASENAME	"lkfile"
18
19static char fname[255];
20
21static int nlinks = 1000;
22
23static void verify_link(void)
24{
25	int cnt;
26	char lname[1024];
27	struct stat fbuf, lbuf;
28
29	for (cnt = 1; cnt < nlinks; cnt++) {
30		sprintf(lname, "%s_%d", fname, cnt);
31		TST_EXP_PASS_SILENT(link(fname, lname), "link(%s, %s)", fname, lname);
32	}
33
34	SAFE_STAT(fname, &fbuf);
35
36	for (cnt = 1; cnt < nlinks; cnt++) {
37		sprintf(lname, "%s_%d", fname, cnt);
38
39		SAFE_STAT(lname, &lbuf);
40		if (fbuf.st_nlink <= 1 || lbuf.st_nlink <= 1 ||
41		    (fbuf.st_nlink != lbuf.st_nlink)) {
42
43			tst_res(TFAIL,
44				 "link(%s, %s[1-%d]) ret %ld for %d "
45			         "files, stat values do not match %d %d",
46				 fname, fname, nlinks,
47				 TST_RET, nlinks,
48				 (int)fbuf.st_nlink, (int)lbuf.st_nlink);
49			break;
50		}
51	}
52
53	if (cnt >= nlinks) {
54		tst_res(TPASS,
55			 "link(%s, %s[1-%d]) ret %ld for %d files, "
56		         "stat linkcounts match %d",
57			 fname, fname, nlinks, TST_RET,
58			 nlinks, (int)fbuf.st_nlink);
59	}
60
61	for (cnt = 1; cnt < nlinks; cnt++) {
62		sprintf(lname, "%s_%d", fname, cnt);
63		SAFE_UNLINK(lname);
64	}
65}
66
67static void setup(void)
68{
69	sprintf(fname, "%s_%d", BASENAME, getpid());
70	SAFE_TOUCH(fname, 0700, NULL);
71}
72
73static struct tst_test test = {
74        .test_all = verify_link,
75        .setup = setup,
76        .needs_tmpdir = 1,
77};
78