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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>
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2
tools/testing/selftests/filesystems/eventfd/.gitignore
vendored
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2
tools/testing/selftests/filesystems/eventfd/.gitignore
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# SPDX-License-Identifier: GPL-2.0-only
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eventfd_test
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7
tools/testing/selftests/filesystems/eventfd/Makefile
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7
tools/testing/selftests/filesystems/eventfd/Makefile
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# SPDX-License-Identifier: GPL-2.0
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CFLAGS += $(KHDR_INCLUDES)
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LDLIBS += -lpthread
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TEST_GEN_PROGS := eventfd_test
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include ../../lib.mk
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186
tools/testing/selftests/filesystems/eventfd/eventfd_test.c
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186
tools/testing/selftests/filesystems/eventfd/eventfd_test.c
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// SPDX-License-Identifier: GPL-2.0
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#define _GNU_SOURCE
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#include <errno.h>
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#include <fcntl.h>
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#include <asm/unistd.h>
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#include <linux/time_types.h>
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#include <unistd.h>
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#include <assert.h>
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#include <signal.h>
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#include <pthread.h>
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#include <sys/epoll.h>
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#include <sys/eventfd.h>
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#include "../../kselftest_harness.h"
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struct error {
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int code;
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char msg[512];
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};
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static int error_set(struct error *err, int code, const char *fmt, ...)
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{
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va_list args;
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int r;
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if (code == 0 || !err || err->code != 0)
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return code;
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err->code = code;
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va_start(args, fmt);
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r = vsnprintf(err->msg, sizeof(err->msg), fmt, args);
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assert((size_t)r < sizeof(err->msg));
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va_end(args);
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return code;
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}
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static inline int sys_eventfd2(unsigned int count, int flags)
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{
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return syscall(__NR_eventfd2, count, flags);
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}
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TEST(eventfd01)
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{
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int fd, flags;
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fd = sys_eventfd2(0, 0);
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ASSERT_GE(fd, 0);
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flags = fcntl(fd, F_GETFL);
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// since the kernel automatically added O_RDWR.
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EXPECT_EQ(flags, O_RDWR);
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close(fd);
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}
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TEST(eventfd02)
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{
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int fd, flags;
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fd = sys_eventfd2(0, EFD_CLOEXEC);
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ASSERT_GE(fd, 0);
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flags = fcntl(fd, F_GETFD);
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ASSERT_GT(flags, -1);
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EXPECT_EQ(flags, FD_CLOEXEC);
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close(fd);
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}
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TEST(eventfd03)
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{
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int fd, flags;
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fd = sys_eventfd2(0, EFD_NONBLOCK);
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ASSERT_GE(fd, 0);
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flags = fcntl(fd, F_GETFL);
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ASSERT_GT(flags, -1);
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EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
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EXPECT_EQ(flags & O_RDWR, O_RDWR);
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close(fd);
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}
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TEST(eventfd04)
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{
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int fd, flags;
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fd = sys_eventfd2(0, EFD_CLOEXEC|EFD_NONBLOCK);
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ASSERT_GE(fd, 0);
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flags = fcntl(fd, F_GETFL);
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ASSERT_GT(flags, -1);
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EXPECT_EQ(flags & EFD_NONBLOCK, EFD_NONBLOCK);
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EXPECT_EQ(flags & O_RDWR, O_RDWR);
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flags = fcntl(fd, F_GETFD);
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ASSERT_GT(flags, -1);
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EXPECT_EQ(flags, FD_CLOEXEC);
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close(fd);
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}
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static inline void trim_newline(char *str)
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{
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char *pos = strrchr(str, '\n');
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if (pos)
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*pos = '\0';
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}
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static int verify_fdinfo(int fd, struct error *err, const char *prefix,
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size_t prefix_len, const char *expect, ...)
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{
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char buffer[512] = {0, };
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char path[512] = {0, };
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va_list args;
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FILE *f;
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char *line = NULL;
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size_t n = 0;
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int found = 0;
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int r;
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va_start(args, expect);
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r = vsnprintf(buffer, sizeof(buffer), expect, args);
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assert((size_t)r < sizeof(buffer));
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va_end(args);
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snprintf(path, sizeof(path), "/proc/self/fdinfo/%d", fd);
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f = fopen(path, "re");
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if (!f)
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return error_set(err, -1, "fdinfo open failed for %d", fd);
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while (getline(&line, &n, f) != -1) {
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char *val;
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if (strncmp(line, prefix, prefix_len))
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continue;
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found = 1;
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val = line + prefix_len;
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r = strcmp(val, buffer);
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if (r != 0) {
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trim_newline(line);
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trim_newline(buffer);
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error_set(err, -1, "%s '%s' != '%s'",
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prefix, val, buffer);
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}
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break;
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}
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free(line);
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fclose(f);
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if (found == 0)
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return error_set(err, -1, "%s not found for fd %d",
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prefix, fd);
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return 0;
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}
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TEST(eventfd05)
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{
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struct error err = {0};
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int fd, ret;
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fd = sys_eventfd2(0, EFD_SEMAPHORE);
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ASSERT_GE(fd, 0);
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ret = fcntl(fd, F_GETFL);
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ASSERT_GT(ret, -1);
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EXPECT_EQ(ret & O_RDWR, O_RDWR);
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// The semaphore could only be obtained from fdinfo.
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ret = verify_fdinfo(fd, &err, "eventfd-semaphore: ", 19, "1\n");
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if (ret != 0)
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ksft_print_msg("eventfd-semaphore check failed, msg: %s\n",
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err.msg);
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EXPECT_EQ(ret, 0);
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close(fd);
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}
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TEST_HARNESS_MAIN
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