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Subject[PATCH] tools,selftest: kcmp -- Add KCMP_EPOLL_TFD testing
KCMP's KCMP_EPOLL_TFD mode merged in commit
0791e3644e5ef21646fe565b9061788d05ec71d4 but
we've had no selftest for it yet (except in
criu development list). Thus add it.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
CC: Andrey Vagin <avagin@openvz.org>
CC: Andrew Morton <akpm@linuxfoundation.org>
CC: Pavel Emelyanov <xemul@virtuozzo.com>
CC: Michael Kerrisk <mtk.manpages@gmail.com>
---
tools/testing/selftests/kcmp/kcmp_test.c | 60 +++++++++++++++++++++++++++++--
1 file changed, 58 insertions(+), 2 deletions(-)

Index: linux-ml.git/tools/testing/selftests/kcmp/kcmp_test.c
===================================================================
--- linux-ml.git.orig/tools/testing/selftests/kcmp/kcmp_test.c
+++ linux-ml.git/tools/testing/selftests/kcmp/kcmp_test.c
@@ -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");
@@ -88,6 +126,24 @@ int main(int argc, char **argv)
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 {
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