/*
 *
 *   Copyright (c) International Business Machines  Corp., 2001
 *
 *   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
 *	sendfile02.c
 *
 * DESCRIPTION
 *	Testcase to test the basic functionality of the sendfile(2) system call.
 *
 * ALGORITHM
 *	1. call sendfile(2) with offset = 0
 *	2. call sendfile(2) with offset in the middle of the file
 *
 * USAGE:  <for command-line>
 *  sendfile02 [-c n] [-f] [-i n] [-I x] [-P x] [-t]
 *     where,
 *             -f   : Turn off functionality Testing.
 *             -i n : Execute test n times.
 *             -I x : Execute test for x seconds.
 *             -P x : Pause for x seconds between iterations.
 *             -t   : Turn on syscall timing.
 *
 * HISTORY
 *	07/2001 Ported by Wayne Boyer
 *	08/2002 Make it use a socket so it works with 2.5 kernel
 *
 * RESTRICTIONS
 *	NONE
 */
#include <stdio.h>
#include <errno.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/sendfile.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <inttypes.h>
#include "test.h"

#ifndef OFF_T
#define OFF_T off_t
#endif /* Not def: OFF_T */

TCID_DEFINE(sendfile02);
int TST_TOTAL = 4;

char in_file[100];
char out_file[100];
int out_fd;
pid_t child_pid;
static int sockfd, s;
static struct sockaddr_in sin1;	/* shared between do_child and create_server */

void cleanup(void);
void do_child(void);
void setup(void);
int create_server(void);

struct test_case_t {
	char *desc;
	int offset;
	int exp_retval;
	int exp_updated_offset;
} testcases[] = {
	{
	"Test sendfile(2) with offset = 0", 0, 26, 26}, {
	"Test sendfile(2) with offset in the middle of file", 2, 24, 26}, {
	"Test sendfile(2) with offset in the middle of file", 4, 22, 26}, {
	"Test sendfile(2) with offset in the middle of file", 6, 20, 26}
};

#ifdef UCLINUX
static char *argv0;
#endif

void do_sendfile(OFF_T offset, int i)
{
	int in_fd;
	struct stat sb;
	int wait_status;
	int wait_stat;
	off_t before_pos, after_pos;

	out_fd = create_server();

	if ((in_fd = open(in_file, O_RDONLY)) < 0) {
		tst_brkm(TBROK, cleanup, "open failed: %d", errno);
	}
	if (stat(in_file, &sb) < 0) {
		tst_brkm(TBROK, cleanup, "stat failed: %d", errno);
	}

	if ((before_pos = lseek(in_fd, 0, SEEK_CUR)) < 0) {
		tst_brkm(TBROK, cleanup,
			 "lseek before invoking sendfile failed: %d", errno);
	}

	TEST(sendfile(out_fd, in_fd, &offset, sb.st_size - offset));

	if ((after_pos = lseek(in_fd, 0, SEEK_CUR)) < 0) {
		tst_brkm(TBROK, cleanup,
			 "lseek after invoking sendfile failed: %d", errno);
	}

	/* Close the sockets */
	shutdown(sockfd, SHUT_RDWR);
	shutdown(s, SHUT_RDWR);
	if (TEST_RETURN != testcases[i].exp_retval) {
		tst_resm(TFAIL, "sendfile(2) failed to return "
			 "expected value, expected: %d, "
			 "got: %ld", testcases[i].exp_retval,
			 TEST_RETURN);
		kill(child_pid, SIGKILL);
	} else if (offset != testcases[i].exp_updated_offset) {
		tst_resm(TFAIL, "sendfile(2) failed to update "
			 "OFFSET parameter to expected value, "
			 "expected: %d, got: %" PRId64,
			 testcases[i].exp_updated_offset,
			 (int64_t) offset);
	} else if (before_pos != after_pos) {
		tst_resm(TFAIL, "sendfile(2) updated the file position "
			 " of in_fd unexpectedly, expected file position: %"
			 PRId64 ", " " actual file position %" PRId64,
			 (int64_t) before_pos, (int64_t) after_pos);
	} else {
		tst_resm(TPASS, "functionality of sendfile() is "
			 "correct");
		wait_status = waitpid(-1, &wait_stat, 0);
	}

	close(in_fd);
}

/*
 * do_child
 */
void do_child(void)
{
	int lc;
	socklen_t length;
	char rbuf[4096];

	for (lc = 0; TEST_LOOPING(lc); lc++) {
		length = sizeof(sin1);
		recvfrom(sockfd, rbuf, 4096, 0, (struct sockaddr *)&sin1,
			 &length);
	}
	exit(0);
}

/*
 * setup() - performs all ONE TIME setup for this test.
 */
void setup(void)
{
	int fd;
	char buf[100];

	tst_sig(FORK, DEF_HANDLER, cleanup);

	TEST_PAUSE;

	/* make a temporary directory and cd to it */
	tst_tmpdir();
	sprintf(in_file, "in.%d", getpid());
	if ((fd = creat(in_file, 00700)) < 0) {
		tst_brkm(TBROK, cleanup, "creat failed in setup, errno: %d",
			 errno);
	}
	sprintf(buf, "abcdefghijklmnopqrstuvwxyz");
	if (write(fd, buf, strlen(buf)) < 0) {
		tst_brkm(TBROK, cleanup, "write failed, errno: %d", errno);
	}
	close(fd);
	sprintf(out_file, "out.%d", getpid());
}

/*
 * cleanup() - performs all ONE TIME cleanup for this test at
 *	       completion or premature exit.
 */
void cleanup(void)
{

	close(out_fd);
	/* delete the test directory created in setup() */
	tst_rmdir();

}

int create_server(void)
{
	static int count = 0;
	socklen_t slen = sizeof(sin1);

	sockfd = socket(PF_INET, SOCK_DGRAM, 0);
	if (sockfd < 0) {
		tst_brkm(TBROK, cleanup, "call to socket() failed: %s",
			 strerror(errno));
		return -1;
	}
	sin1.sin_family = AF_INET;
	sin1.sin_port = 0; /* pick random free port */
	sin1.sin_addr.s_addr = INADDR_ANY;
	count++;
	if (bind(sockfd, (struct sockaddr *)&sin1, sizeof(sin1)) < 0) {
		tst_brkm(TBROK, cleanup, "call to bind() failed: %s",
			 strerror(errno));
		return -1;
	}
	if (getsockname(sockfd, (struct sockaddr *)&sin1, &slen) == -1)
		tst_brkm(TBROK | TERRNO, cleanup, "getsockname failed");

	child_pid = FORK_OR_VFORK();
	if (child_pid < 0) {
		tst_brkm(TBROK, cleanup, "client/server fork failed: %s",
			 strerror(errno));
		return -1;
	}
	if (!child_pid) {	/* child */
#ifdef UCLINUX
		if (self_exec(argv0, "") < 0) {
			tst_brkm(TBROK, cleanup, "self_exec failed");
			return -1;

		}
#else
		do_child();
#endif
	}

	s = socket(PF_INET, SOCK_DGRAM, 0);
	inet_aton("127.0.0.1", &sin1.sin_addr);
	if (s < 0) {
		tst_brkm(TBROK, cleanup, "call to socket() failed: %s",
			 strerror(errno));
		return -1;
	}
	if (connect(s, (struct sockaddr *)&sin1, sizeof(sin1)) < 0) {
		tst_brkm(TBROK, cleanup, "call to connect() failed: %s",
			 strerror(errno));
	}
	return s;

}

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

	tst_parse_opts(ac, av, NULL, NULL);
#ifdef UCLINUX
	argv0 = av[0];
	maybe_run_child(&do_child, "");
#endif

	setup();

	/*
	 * The following loop checks looping state if -c option given
	 */
	for (lc = 0; TEST_LOOPING(lc); lc++) {
		tst_count = 0;

		for (i = 0; i < TST_TOTAL; ++i) {
			do_sendfile(testcases[i].offset, i);
		}
	}
	cleanup();

	tst_exit();
}