selftests: add eventfd selftests

This adds the promised selftest for eventfd.  It will verify the flags of
eventfd2, including EFD_CLOEXEC, EFD_NONBLOCK and EFD_SEMAPHORE.

Link: https://lkml.kernel.org/r/tencent_3C9A298878D22B5D8F79DC2FEE99BB4A8F05@qq.com
Signed-off-by: Wen Yang <wenyang.linux@foxmail.com>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Javier Martinez Canillas <javierm@redhat.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Pengfei Xu <pengfei.xu@intel.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Andrei Vagin <avagin@google.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Wen Yang 2024-01-08 23:51:32 +08:00 committed by Andrew Morton
parent 2947a4567f
commit 7c37857fc2
3 changed files with 195 additions and 0 deletions

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# SPDX-License-Identifier: GPL-2.0-only
eventfd_test

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# SPDX-License-Identifier: GPL-2.0
CFLAGS += $(KHDR_INCLUDES)
LDLIBS += -lpthread
TEST_GEN_PROGS := eventfd_test
include ../../lib.mk

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// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <errno.h>
#include <fcntl.h>
#include <asm/unistd.h>
#include <linux/time_types.h>
#include <unistd.h>
#include <assert.h>
#include <signal.h>
#include <pthread.h>
#include <sys/epoll.h>
#include <sys/eventfd.h>
#include "../../kselftest_harness.h"
struct error {
int code;
char msg[512];
};
static int error_set(struct error *err, int code, const char *fmt, ...)
{
va_list args;
int r;
if (code == 0 || !err || err->code != 0)
return code;
err->code = code;
va_start(args, fmt);
r = vsnprintf(err->msg, sizeof(err->msg), fmt, args);
assert((size_t)r < sizeof(err->msg));
va_end(args);
return code;
}
static inline int sys_eventfd2(unsigned int count, int flags)
{
return syscall(__NR_eventfd2, count, flags);
}
TEST(eventfd01)
{
int fd, flags;
fd = sys_eventfd2(0, 0);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFL);
// since the kernel automatically added O_RDWR.
EXPECT_EQ(flags, O_RDWR);
close(fd);
}
TEST(eventfd02)
{
int fd, flags;
fd = sys_eventfd2(0, EFD_CLOEXEC);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFD);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags, FD_CLOEXEC);
close(fd);
}
TEST(eventfd03)
{
int fd, flags;
fd = sys_eventfd2(0, EFD_NONBLOCK);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFL);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
EXPECT_EQ(flags & O_RDWR, O_RDWR);
close(fd);
}
TEST(eventfd04)
{
int fd, flags;
fd = sys_eventfd2(0, EFD_CLOEXEC|EFD_NONBLOCK);
ASSERT_GE(fd, 0);
flags = fcntl(fd, F_GETFL);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
EXPECT_EQ(flags & O_RDWR, O_RDWR);
flags = fcntl(fd, F_GETFD);
ASSERT_GT(flags, -1);
EXPECT_EQ(flags, FD_CLOEXEC);
close(fd);
}
static inline void trim_newline(char *str)
{
char *pos = strrchr(str, '\n');
if (pos)
*pos = '\0';
}
static int verify_fdinfo(int fd, struct error *err, const char *prefix,
size_t prefix_len, const char *expect, ...)
{
char buffer[512] = {0, };
char path[512] = {0, };
va_list args;
FILE *f;
char *line = NULL;
size_t n = 0;
int found = 0;
int r;
va_start(args, expect);
r = vsnprintf(buffer, sizeof(buffer), expect, args);
assert((size_t)r < sizeof(buffer));
va_end(args);
snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
f = fopen(path, "re");
if (!f)
return error_set(err, -1, "fdinfo open failed for %d", fd);
while (getline(&line, &n, f) != -1) {
char *val;
if (strncmp(line, prefix, prefix_len))
continue;
found = 1;
val = line + prefix_len;
r = strcmp(val, buffer);
if (r != 0) {
trim_newline(line);
trim_newline(buffer);
error_set(err, -1, "%s '%s' != '%s'",
prefix, val, buffer);
}
break;
}
free(line);
fclose(f);
if (found == 0)
return error_set(err, -1, "%s not found for fd %d",
prefix, fd);
return 0;
}
TEST(eventfd05)
{
struct error err = {0};
int fd, ret;
fd = sys_eventfd2(0, EFD_SEMAPHORE);
ASSERT_GE(fd, 0);
ret = fcntl(fd, F_GETFL);
ASSERT_GT(ret, -1);
EXPECT_EQ(ret & O_RDWR, O_RDWR);
// The semaphore could only be obtained from fdinfo.
ret = verify_fdinfo(fd, &err, "eventfd-semaphore: ", 19, "1\n");
if (ret != 0)
ksft_print_msg("eventfd-semaphore check failed, msg: %s\n",
err.msg);
EXPECT_EQ(ret, 0);
close(fd);
}
TEST_HARNESS_MAIN