From: Wen Yang wenyang.linux@foxmail.com

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

Signed-off-by: Wen Yang wenyang.linux@foxmail.com Cc: Shuah Khan shuah@kernel.org Cc: Javier Martinez Canillas javierm@redhat.com Cc: Andrew Morton akpm@linux-foundation.org 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: linux-kselftest@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- .../selftests/filesystems/eventfd/.gitignore | 2 + .../selftests/filesystems/eventfd/Makefile | 7 + .../filesystems/eventfd/eventfd_test.c | 186 ++++++++++++++++++ 3 files changed, 195 insertions(+) create mode 100644 tools/testing/selftests/filesystems/eventfd/.gitignore create mode 100644 tools/testing/selftests/filesystems/eventfd/Makefile create mode 100644 tools/testing/selftests/filesystems/eventfd/eventfd_test.c

diff --git a/tools/testing/selftests/filesystems/eventfd/.gitignore b/tools/testing/selftests/filesystems/eventfd/.gitignore new file mode 100644 index 000000000000..483faf59fe4a --- /dev/null +++ b/tools/testing/selftests/filesystems/eventfd/.gitignore @@ -0,0 +1,2 @@ +# SPDX-License-Identifier: GPL-2.0-only +eventfd_test diff --git a/tools/testing/selftests/filesystems/eventfd/Makefile b/tools/testing/selftests/filesystems/eventfd/Makefile new file mode 100644 index 000000000000..0a8e3910df15 --- /dev/null +++ b/tools/testing/selftests/filesystems/eventfd/Makefile @@ -0,0 +1,7 @@ +# SPDX-License-Identifier: GPL-2.0 + +CFLAGS += $(KHDR_INCLUDES) +LDLIBS += -lpthread +TEST_GEN_PROGS := eventfd_test + +include ../../lib.mk diff --git a/tools/testing/selftests/filesystems/eventfd/eventfd_test.c b/tools/testing/selftests/filesystems/eventfd/eventfd_test.c new file mode 100644 index 000000000000..f142a137526c --- /dev/null +++ b/tools/testing/selftests/filesystems/eventfd/eventfd_test.c @@ -0,0 +1,186 @@ +// 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