// SPDX-License-Identifier: GPL-2.0-or-later
/*
 * Copyright (c) 2000 Silicon Graphics, Inc.  All Rights Reserved.
 *  AUTHOR		: Richard Logan
 *  CO-PILOT		: William Roske
 * Copyright (c) 2014 Cyril Hrubis <chrubis@suse.cz>
 */

/*
 * Test if link(2) fails with EMLINK.
 */

#include <stdio.h>
#include <sys/stat.h>
#include "tst_test.h"

#define BASENAME	"lkfile"

static char fname[255];

static int nlinks = 1000;

static void verify_link(void)
{
	int cnt;
	char lname[1024];
	struct stat fbuf, lbuf;

	for (cnt = 1; cnt < nlinks; cnt++) {
		sprintf(lname, "%s_%d", fname, cnt);
		TST_EXP_PASS_SILENT(link(fname, lname), "link(%s, %s)", fname, lname);
	}

	SAFE_STAT(fname, &fbuf);

	for (cnt = 1; cnt < nlinks; cnt++) {
		sprintf(lname, "%s_%d", fname, cnt);

		SAFE_STAT(lname, &lbuf);
		if (fbuf.st_nlink <= 1 || lbuf.st_nlink <= 1 ||
		    (fbuf.st_nlink != lbuf.st_nlink)) {

			tst_res(TFAIL,
				 "link(%s, %s[1-%d]) ret %ld for %d "
			         "files, stat values do not match %d %d",
				 fname, fname, nlinks,
				 TST_RET, nlinks,
				 (int)fbuf.st_nlink, (int)lbuf.st_nlink);
			break;
		}
	}

	if (cnt >= nlinks) {
		tst_res(TPASS,
			 "link(%s, %s[1-%d]) ret %ld for %d files, "
		         "stat linkcounts match %d",
			 fname, fname, nlinks, TST_RET,
			 nlinks, (int)fbuf.st_nlink);
	}

	for (cnt = 1; cnt < nlinks; cnt++) {
		sprintf(lname, "%s_%d", fname, cnt);
		SAFE_UNLINK(lname);
	}
}

static void setup(void)
{
	sprintf(fname, "%s_%d", BASENAME, getpid());
	SAFE_TOUCH(fname, 0700, NULL);
}

static struct tst_test test = {
        .test_all = verify_link,
        .setup = setup,
        .needs_tmpdir = 1,
};