/******************************************************************************
 *
 *   Copyright (c) International Business Machines  Corp., 2006
 *
 *   This program is free software;  you can redistribute it and/or modify
 *   it under the terms of the GNU General Public License as published by
 *   the Free Software Foundation; either version 2 of the License, or
 *   (at your option) any later version.
 *
 *   This program is distributed in the hope that it will be useful,
 *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
 *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
 *   the GNU General Public License for more details.
 *
 *   You should have received a copy of the GNU General Public License
 *   along with this program;  if not, write to the Free Software
 *   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * NAME
 *      linkat01.c
 *
 * DESCRIPTION
 *	This test case will verify basic function of linkat
 *	added by kernel 2.6.16 or up.
 *
 * USAGE:  <for command-line>
 * linkat01 [-c n] [-e] [-i n] [-I x] [-P x] [-t] [-p]
 * where:
 *      -c n : Run n copies simultaneously.
 *      -e   : Turn on errno logging.
 *      -i n : Execute test n times.
 *      -I x : Execute test for x seconds.
 *      -p   : Pause for SIGUSR1 before starting
 *      -P x : Pause for x seconds between iterations.
 *      -t   : Turn on syscall timing.
 *
 * Author
 *	Yi Yang <yyangcdl@cn.ibm.com>
 *
 * History
 *      08/25/2006      Created first by Yi Yang <yyangcdl@cn.ibm.com>
 *
 *****************************************************************************/

#define _GNU_SOURCE

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <signal.h>
#include <inttypes.h>
#include <limits.h>
#include "test.h"
#include "lapi/syscalls.h"
#include "safe_macros.h"

#ifndef AT_FDCWD
#define AT_FDCWD -100
#endif
#ifndef AT_SYMLINK_FOLLOW
#define AT_SYMLINK_FOLLOW 0x400
#endif

struct test_struct;
static void setup();
static void cleanup();
static void setup_every_copy();
static void mylinkat_test(struct test_struct *desc);

#define TEST_DIR1 "olddir"
#define TEST_DIR2 "newdir"
#define TEST_DIR3 "deldir"
#define TEST_FILE1 "oldfile"
#define TEST_FILE2 "newfile"
#define TEST_FIFO "fifo"

#define DPATHNAME_FMT	"%s/" TEST_DIR2 "/" TEST_FILE1
#define SPATHNAME_FMT	"%s/" TEST_DIR1 "/" TEST_FILE1

static char dpathname[PATH_MAX];
static char spathname[PATH_MAX];
static int olddirfd, newdirfd = -1, cwd_fd = AT_FDCWD, stdinfd = 0, badfd =
    -1, deldirfd;

struct test_struct {
	int *oldfd;
	const char *oldfn;
	int *newfd;
	const char *newfn;
	int flags;
	const char *referencefn1;
	const char *referencefn2;
	int expected_errno;
} test_desc[] = {
	/* 1. relative paths */
	{
	&olddirfd, TEST_FILE1, &newdirfd, TEST_FILE1, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 2. abs path at source */
	{
	&olddirfd, spathname, &newdirfd, TEST_FILE1, 0, 0, 0, 0},
	    /* 3. abs path at dst */
	{
	&olddirfd, TEST_FILE1, &newdirfd, dpathname, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 4. relative paths to cwd */
	{
	&cwd_fd, TEST_DIR1 "/" TEST_FILE1, &newdirfd, TEST_FILE1, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 5. relative paths to cwd */
	{
	&olddirfd, TEST_FILE1, &cwd_fd, TEST_DIR2 "/" TEST_FILE1, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 6. abs path at source */
	{
	&cwd_fd, spathname, &newdirfd, TEST_FILE1, 0, 0, 0, 0},
	    /* 7. abs path at dst */
	{
	&olddirfd, TEST_FILE1, &cwd_fd, dpathname, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 8. relative paths to invalid */
	{
	&stdinfd, TEST_DIR1 "/" TEST_FILE1, &newdirfd, TEST_FILE1, 0,
		    0, 0, ENOTDIR},
	    /* 9. relative paths to invalid */
	{
	&olddirfd, TEST_FILE1, &stdinfd, TEST_DIR2 "/" TEST_FILE1, 0,
		    0, 0, ENOTDIR},
	    /* 10. abs path at source */
	{
	&stdinfd, spathname, &newdirfd, TEST_FILE1, 0, 0, 0, 0},
	    /* 11. abs path at dst */
	{
	&olddirfd, TEST_FILE1, &stdinfd, dpathname, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 12. relative paths to bad */
	{
	&badfd, TEST_DIR1 "/" TEST_FILE1, &newdirfd, TEST_FILE1, 0,
		    0, 0, EBADF},
	    /* 13. relative paths to bad */
	{
	&olddirfd, TEST_FILE1, &badfd, TEST_DIR2 "/" TEST_FILE1, 0,
		    0, 0, EBADF},
	    /* 14. abs path at source */
	{
	&badfd, spathname, &newdirfd, TEST_FILE1, 0, 0, 0, 0},
	    /* 15. abs path at dst */
	{
	&olddirfd, TEST_FILE1, &badfd, dpathname, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 16. relative paths to deleted */
	{
	&deldirfd, TEST_DIR1 "/" TEST_FILE1, &newdirfd, TEST_FILE1, 0,
		    0, 0, ENOENT},
	    /* 17. relative paths to deleted */
	{
	&olddirfd, TEST_FILE1, &deldirfd, TEST_DIR2 "/" TEST_FILE1, 0,
		    0, 0, ENOENT},
	    /* 18. abs path at source */
	{
	&deldirfd, spathname, &newdirfd, TEST_FILE1, 0, 0, 0, 0},
	    /* 19. abs path at dst */
	{
	&olddirfd, TEST_FILE1, &deldirfd, dpathname, 0,
		    TEST_DIR1 "/" TEST_FILE1, TEST_DIR2 "/" TEST_FILE1, 0},
	    /* 20. x-device link */
	{
	&cwd_fd, "/proc/cpuinfo", &newdirfd, TEST_FILE1, 0, 0, 0, EXDEV},
	    /* 21. directory link */
	{
	&olddirfd, ".", &newdirfd, TEST_FILE1, 0, 0, 0, EPERM},
	    /* 22. invalid flag */
	{
	&olddirfd, TEST_FILE1, &newdirfd, TEST_FILE1, 1, 0, 0, EINVAL},
	    /* 23. fifo link */
	    /* XXX (garrcoop): Removed because it hangs the overall test. Need to
	     * find a legitimate means to exercise this functionality, if in fact
	     * it's a valid testcase -- which it should be.
	     */
	    /* { &olddirfd, TEST_FIFO, &newdirfd, TEST_FILE1, 0,
	       TEST_DIR1"/"TEST_FIFO, TEST_DIR2"/"TEST_FILE1, 0 } */
};

char *TCID = "linkat01";
int TST_TOTAL = sizeof(test_desc) / sizeof(*test_desc);

static int mylinkat(int olddirfd, const char *oldfilename, int newdirfd,
		    const char *newfilename, int flags)
{
	return ltp_syscall(__NR_linkat, olddirfd, oldfilename, newdirfd,
		       newfilename, flags);
}

int main(int ac, char **av)
{
	int lc;
	int i;

	if ((tst_kvercmp(2, 6, 16)) < 0) {
		tst_resm(TWARN, "This test can only run on kernels that are ");
		tst_resm(TWARN, "2.6.16 and higher");
		exit(0);
	}

	tst_parse_opts(ac, av, NULL, NULL);

	setup();

	for (lc = 0; TEST_LOOPING(lc); lc++) {

		tst_count = 0;

		for (i = 0; i < TST_TOTAL; i++) {
			setup_every_copy();
			mylinkat_test(&test_desc[i]);
		}

	}

	cleanup();
	tst_exit();
}

static void setup_every_copy(void)
{
	close(newdirfd);
	unlink(dpathname);
	rmdir(TEST_DIR2);

	SAFE_MKDIR(cleanup, TEST_DIR2, 0700);
	newdirfd = SAFE_OPEN(cleanup, TEST_DIR2, O_DIRECTORY);
}

static void mylinkat_test(struct test_struct *desc)
{
	int fd;

	TEST(mylinkat
	     (*desc->oldfd, desc->oldfn, *desc->newfd, desc->newfn,
	      desc->flags));

	if (TEST_ERRNO == desc->expected_errno) {
		if (TEST_RETURN == 0 && desc->referencefn1 != NULL) {
			int tnum = rand(), vnum = ~tnum;
			fd = SAFE_OPEN(cleanup, desc->referencefn1,
				       O_RDWR);
			SAFE_WRITE(cleanup, 1, fd, &tnum, sizeof(tnum));
			SAFE_CLOSE(cleanup, fd);

			fd = SAFE_OPEN(cleanup, desc->referencefn2,
				       O_RDONLY);
			SAFE_READ(cleanup, 1, fd, &vnum, sizeof(vnum));
			SAFE_CLOSE(cleanup, fd);

			if (tnum == vnum)
				tst_resm(TPASS,
					 "linkat is functionality correct");
			else {
				tst_resm(TFAIL,
					 "The link file's content isn't "
					 "as same as the original file's "
					 "although linkat returned 0");
			}
		} else {
			if (TEST_RETURN == 0)
				tst_resm(TPASS,
					 "linkat succeeded as expected");
			else
				tst_resm(TPASS | TTERRNO,
					 "linkat failed as expected");
		}
	} else {
		if (TEST_RETURN == 0)
			tst_resm(TFAIL, "linkat succeeded unexpectedly");
		else
			tst_resm(TFAIL | TTERRNO,
				 "linkat failed unexpectedly; expected %d - %s",
				 desc->expected_errno,
				 strerror(desc->expected_errno));
	}
}

void setup(void)
{
	char *cwd;
	int fd;

	tst_sig(NOFORK, DEF_HANDLER, cleanup);

	tst_tmpdir();

	cwd = get_current_dir_name();
	if (cwd == NULL) {
		tst_brkm(TFAIL | TERRNO, cleanup,
			 "Failed to get current working directory");
	}

	SAFE_MKDIR(cleanup, TEST_DIR1, 0700);
	SAFE_MKDIR(cleanup, TEST_DIR3, 0700);
	olddirfd = SAFE_OPEN(cleanup, TEST_DIR1, O_DIRECTORY);
	deldirfd = SAFE_OPEN(cleanup, TEST_DIR3, O_DIRECTORY);
	SAFE_RMDIR(cleanup, TEST_DIR3);
	fd = SAFE_OPEN(cleanup, TEST_DIR1 "/" TEST_FILE1, O_CREAT | O_EXCL, 0600);
	SAFE_CLOSE(cleanup, fd);
	SAFE_MKFIFO(cleanup, TEST_DIR1 "/" TEST_FIFO, 0600);

	snprintf(dpathname, sizeof(dpathname), DPATHNAME_FMT, cwd);
	snprintf(spathname, sizeof(spathname), SPATHNAME_FMT, cwd);

	free(cwd);
}

static void cleanup(void)
{
	tst_rmdir();
}