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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 0791e3644e ("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: Cyrill 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: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Cyrill Gorcunov 2017-09-08 16:13:19 -07:00 committed by Linus Torvalds
parent b4ccec41af
commit 66559a691a
1 changed files with 58 additions and 2 deletions
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60
tools/testing/selftests/kcmp/kcmp_test.c
View File

@ -8,7 +8,6 @@
#include <errno.h> #include <errno.h>
#include <string.h> #include <string.h>
#include <fcntl.h> #include <fcntl.h>
#include <linux/unistd.h> #include <linux/unistd.h>
#include <linux/kcmp.h> #include <linux/kcmp.h>
@ -16,20 +15,28 @@
#include <sys/types.h> #include <sys/types.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/wait.h> #include <sys/wait.h>
#include <sys/epoll.h>
#include "../kselftest.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); return syscall(__NR_kcmp, pid1, pid2, type, fd1, fd2);
} }
static const unsigned int duped_num = 64;
int main(int argc, char **argv) int main(int argc, char **argv)
{ {
const char kpath[] = "kcmp-test-file"; const char kpath[] = "kcmp-test-file";
struct kcmp_epoll_slot epoll_slot;
struct epoll_event ev;
int pid1, pid2; int pid1, pid2;
int pipefd[2];
int fd1, fd2; int fd1, fd2;
int epollfd;
int status; int status;
int fddup;
fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644); fd1 = open(kpath, O_RDWR | O_CREAT | O_TRUNC, 0644);
pid1 = getpid(); pid1 = getpid();
@ -39,6 +46,37 @@ int main(int argc, char **argv)
ksft_exit_fail(); 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(); pid2 = fork();
if (pid2 < 0) { if (pid2 < 0) {
perror("fork failed"); perror("fork failed");
@ -95,6 +133,24 @@ int main(int argc, char **argv)
ksft_inc_pass_cnt(); 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(); ksft_print_cnts();
if (ret) if (ret)