// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE

#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <limits.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <fcntl.h>
#include <linux/unistd.h>
#include <linux/kcmp.h>

#include <sys/syscall.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/epoll.h>

#include "../kselftest.h"

static long sys_kcmp(int pid1, int pid2, int type, unsigned long fd1, unsigned long fd2)
{
	return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
}

static const unsigned int duped_num = 64;

int main(int argc, char **argv)
{
	const char kpath[] = "kcmp-test-file";
	struct kcmp_epoll_slot epoll_slot;
	struct epoll_event ev;
	int pid1, pid2;
	int pipefd[2];
	int fd1, fd2;
	int epollfd;
	int status;
	int fddup;

	fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
	pid1 = getpid();

	if (fd1 < 0) {
		perror("Can't create file");
		ksft_exit_fail();
	}

	if (pipe(pipefd)) {
		perror("Can't create pipe");
		ksft_exit_fail();
	}

	epollfd = epoll_create1(0);
	if (epollfd < 0) {
		perror("epoll_create1 failed");
		ksft_exit_fail();
	}

	memset(&ev, 0xff, sizeof(ev));
	ev.events = EPOLLIN | EPOLLOUT;

	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, pipefd[0], &ev)) {
		perror("epoll_ctl failed");
		ksft_exit_fail();
	}

	fddup = dup2(pipefd[1], duped_num);
	if (fddup < 0) {
		perror("dup2 failed");
		ksft_exit_fail();
	}

	if (epoll_ctl(epollfd, EPOLL_CTL_ADD, fddup, &ev)) {
		perror("epoll_ctl failed");
		ksft_exit_fail();
	}
	close(fddup);

	pid2 = fork();
	if (pid2 < 0) {
		perror("fork failed");
		ksft_exit_fail();
	}

	if (!pid2) {
		int pid2 = getpid();
		int ret;

		fd2 = open(kpath, O_RDWR, 0644);
		if (fd2 < 0) {
			perror("Can't open file");
			ksft_exit_fail();
		}

		/* An example of output and arguments */
		printf("pid1: %6d pid2: %6d FD: %2ld FILES: %2ld VM: %2ld "
		       "FS: %2ld SIGHAND: %2ld IO: %2ld SYSVSEM: %2ld "
		       "INV: %2ld\n",
		       pid1, pid2,
		       sys_kcmp(pid1, pid2, KCMP_FILE,		fd1, fd2),
		       sys_kcmp(pid1, pid2, KCMP_FILES,		0, 0),
		       sys_kcmp(pid1, pid2, KCMP_VM,		0, 0),
		       sys_kcmp(pid1, pid2, KCMP_FS,		0, 0),
		       sys_kcmp(pid1, pid2, KCMP_SIGHAND,	0, 0),
		       sys_kcmp(pid1, pid2, KCMP_IO,		0, 0),
		       sys_kcmp(pid1, pid2, KCMP_SYSVSEM,	0, 0),

			/* This one should fail */
		       sys_kcmp(pid1, pid2, KCMP_TYPES + 1,	0, 0));

		/* This one should return same fd */
		ret = sys_kcmp(pid1, pid2, KCMP_FILE, fd1, fd1);
		if (ret) {
			printf("FAIL: 0 expected but %d returned (%s)\n",
				ret, strerror(errno));
			ksft_inc_fail_cnt();
			ret = -1;
		} else {
			printf("PASS: 0 returned as expected\n");
			ksft_inc_pass_cnt();
		}

		/* Compare with self */
		ret = sys_kcmp(pid1, pid1, KCMP_VM, 0, 0);
		if (ret) {
			printf("FAIL: 0 expected but %d returned (%s)\n",
				ret, strerror(errno));
			ksft_inc_fail_cnt();
			ret = -1;
		} else {
			printf("PASS: 0 returned as expected\n");
			ksft_inc_pass_cnt();
		}

		/* Compare epoll target */
		epoll_slot = (struct kcmp_epoll_slot) {
			.efd	= epollfd,
			.tfd	= duped_num,
			.toff	= 0,
		};
		ret = sys_kcmp(pid1, pid1, KCMP_EPOLL_TFD, pipefd[1],
			       (unsigned long)(void *)&epoll_slot);
		if (ret) {
			printf("FAIL: 0 expected but %d returned (%s)\n",
				ret, strerror(errno));
			ksft_inc_fail_cnt();
			ret = -1;
		} else {
			printf("PASS: 0 returned as expected\n");
			ksft_inc_pass_cnt();
		}

		ksft_print_cnts();

		if (ret)
			ksft_exit_fail();
		else
			ksft_exit_pass();
	}

	waitpid(pid2, &status, P_ALL);

	return ksft_exit_pass();
}