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Commit 66559a69 authored by Cyrill Gorcunov's avatar Cyrill Gorcunov Committed by Linus Torvalds
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tools/testing/selftests/kcmp/kcmp_test.c: add KCMP_EPOLL_TFD testing 

KCMP's KCMP_EPOLL_TFD mode merged in commit 0791e364 ("kcmp: add
KCMP_EPOLL_TFD mode to compare epoll target files") we've had no selftest
for it yet (except in criu development list).  Thus add it.

Link: http://lkml.kernel.org/r/20170901151620.GK1898@uranus.lan


Signed-off-by: default avatarCyrill Gorcunov <gorcunov@openvz.org>
Cc: Andrey Vagin <avagin@openvz.org>
Cc: Pavel Emelyanov <xemul@virtuozzo.com>
Cc: Michael Kerrisk <mtk.manpages@gmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent b4ccec41

tools/testing/selftests/kcmp/kcmp_test.c

+58 −2
Original line number Diff line number Diff line
@@ -8,7 +8,6 @@ 
#include <errno.h>

#include <string.h>

#include <fcntl.h>



#include <linux/unistd.h>

#include <linux/kcmp.h>
@@ -16,20 +15,28 @@ 
#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, int fd1, int fd2)

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();
@@ -39,6 +46,37 @@ int main(int argc, char **argv) 
		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");
@@ -95,6 +133,24 @@ int main(int argc, char **argv) 
			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)