This is a bit ugly, but in the next patch we will move to using kselftest_harness.h -- which doesn't play well with being included in multiple compilation units due to duplicate function definitions.
Not including kselftest_harness.h would let us avoid this patch, but the helpers will need include kselftest_harness.h in order to switch to TH_LOG. Signed-off-by: Aleksa Sarai <[email protected]> --- tools/testing/selftests/openat2/Makefile | 2 - tools/testing/selftests/openat2/helpers.c | 109 -------------------------- tools/testing/selftests/openat2/helpers.h | 125 +++++++++++++++++++++++++----- 3 files changed, 107 insertions(+), 129 deletions(-) diff --git a/tools/testing/selftests/openat2/Makefile b/tools/testing/selftests/openat2/Makefile index 185dc76ebb5f..3100b4d8d1b2 100644 --- a/tools/testing/selftests/openat2/Makefile +++ b/tools/testing/selftests/openat2/Makefile @@ -14,5 +14,3 @@ endif LOCAL_HDRS += helpers.h include ../lib.mk - -$(TEST_GEN_PROGS): helpers.c diff --git a/tools/testing/selftests/openat2/helpers.c b/tools/testing/selftests/openat2/helpers.c deleted file mode 100644 index 5074681ffdc9..000000000000 --- a/tools/testing/selftests/openat2/helpers.c +++ /dev/null @@ -1,109 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0-or-later -/* - * Author: Aleksa Sarai <[email protected]> - * Copyright (C) 2018-2019 SUSE LLC. - */ - -#define _GNU_SOURCE -#include <errno.h> -#include <fcntl.h> -#include <stdbool.h> -#include <string.h> -#include <syscall.h> -#include <limits.h> - -#include "helpers.h" - -bool needs_openat2(const struct open_how *how) -{ - return how->resolve != 0; -} - -int raw_openat2(int dfd, const char *path, void *how, size_t size) -{ - int ret = syscall(__NR_openat2, dfd, path, how, size); - return ret >= 0 ? ret : -errno; -} - -int sys_openat2(int dfd, const char *path, struct open_how *how) -{ - return raw_openat2(dfd, path, how, sizeof(*how)); -} - -int sys_openat(int dfd, const char *path, struct open_how *how) -{ - int ret = openat(dfd, path, how->flags, how->mode); - return ret >= 0 ? ret : -errno; -} - -int sys_renameat2(int olddirfd, const char *oldpath, - int newdirfd, const char *newpath, unsigned int flags) -{ - int ret = syscall(__NR_renameat2, olddirfd, oldpath, - newdirfd, newpath, flags); - return ret >= 0 ? ret : -errno; -} - -int touchat(int dfd, const char *path) -{ - int fd = openat(dfd, path, O_CREAT, 0700); - if (fd >= 0) - close(fd); - return fd; -} - -char *fdreadlink(int fd) -{ - char *target, *tmp; - - E_asprintf(&tmp, "/proc/self/fd/%d", fd); - - target = malloc(PATH_MAX); - if (!target) - ksft_exit_fail_msg("fdreadlink: malloc failed\n"); - memset(target, 0, PATH_MAX); - - E_readlink(tmp, target, PATH_MAX); - free(tmp); - return target; -} - -bool fdequal(int fd, int dfd, const char *path) -{ - char *fdpath, *dfdpath, *other; - bool cmp; - - fdpath = fdreadlink(fd); - dfdpath = fdreadlink(dfd); - - if (!path) - E_asprintf(&other, "%s", dfdpath); - else if (*path == '/') - E_asprintf(&other, "%s", path); - else - E_asprintf(&other, "%s/%s", dfdpath, path); - - cmp = !strcmp(fdpath, other); - - free(fdpath); - free(dfdpath); - free(other); - return cmp; -} - -bool openat2_supported = false; - -void __attribute__((constructor)) init(void) -{ - struct open_how how = {}; - int fd; - - BUILD_BUG_ON(sizeof(struct open_how) != OPEN_HOW_SIZE_VER0); - - /* Check openat2(2) support. */ - fd = sys_openat2(AT_FDCWD, ".", &how); - openat2_supported = (fd >= 0); - - if (fd >= 0) - close(fd); -} diff --git a/tools/testing/selftests/openat2/helpers.h b/tools/testing/selftests/openat2/helpers.h index 510e60602511..975de513af86 100644 --- a/tools/testing/selftests/openat2/helpers.h +++ b/tools/testing/selftests/openat2/helpers.h @@ -2,6 +2,7 @@ /* * Author: Aleksa Sarai <[email protected]> * Copyright (C) 2018-2019 SUSE LLC. + * Copyright (C) 2026 Amutable GmbH */ #ifndef __RESOLVEAT_H__ @@ -11,19 +12,14 @@ #include <stdint.h> #include <stdbool.h> #include <errno.h> +#include <limits.h> #include <linux/types.h> +#include <linux/unistd.h> #include "kselftest.h" #define ARRAY_LEN(X) (sizeof (X) / sizeof (*(X))) #define BUILD_BUG_ON(e) ((void)(sizeof(struct { int:(-!!(e)); }))) -#ifndef SYS_openat2 -#ifndef __NR_openat2 -#define __NR_openat2 437 -#endif /* __NR_openat2 */ -#define SYS_openat2 __NR_openat2 -#endif /* SYS_openat2 */ - /* * Arguments for how openat2(2) should open the target path. If @resolve is * zero, then openat2(2) operates very similarly to openat(2). @@ -45,8 +41,6 @@ struct open_how { #define OPEN_HOW_SIZE_VER0 24 /* sizeof first published struct */ #define OPEN_HOW_SIZE_LATEST OPEN_HOW_SIZE_VER0 -bool needs_openat2(const struct open_how *how); - #ifndef RESOLVE_IN_ROOT /* how->resolve flags for openat2(2). */ #define RESOLVE_NO_XDEV 0x01 /* Block mount-point crossings @@ -93,16 +87,111 @@ bool needs_openat2(const struct open_how *how); __FILE__, __LINE__, #expr, ##__VA_ARGS__); \ } while (0) -int raw_openat2(int dfd, const char *path, void *how, size_t size); -int sys_openat2(int dfd, const char *path, struct open_how *how); -int sys_openat(int dfd, const char *path, struct open_how *how); -int sys_renameat2(int olddirfd, const char *oldpath, - int newdirfd, const char *newpath, unsigned int flags); +__maybe_unused +static bool needs_openat2(const struct open_how *how) +{ + return how->resolve != 0; +} + +__maybe_unused +static int raw_openat2(int dfd, const char *path, void *how, size_t size) +{ + int ret = syscall(__NR_openat2, dfd, path, how, size); + + return ret >= 0 ? ret : -errno; +} + +__maybe_unused +static int sys_openat2(int dfd, const char *path, struct open_how *how) +{ + return raw_openat2(dfd, path, how, sizeof(*how)); +} + +__maybe_unused +static int sys_openat(int dfd, const char *path, struct open_how *how) +{ + int ret = openat(dfd, path, how->flags, how->mode); + + return ret >= 0 ? ret : -errno; +} + +__maybe_unused +static int sys_renameat2(int olddirfd, const char *oldpath, + int newdirfd, const char *newpath, unsigned int flags) +{ + int ret = syscall(__NR_renameat2, olddirfd, oldpath, + newdirfd, newpath, flags); + + return ret >= 0 ? ret : -errno; +} + +__maybe_unused +static int touchat(int dfd, const char *path) +{ + int fd = openat(dfd, path, O_CREAT, 0700); + + if (fd >= 0) + close(fd); + return fd; +} + +__maybe_unused +static char *fdreadlink(int fd) +{ + char *target, *tmp; + + E_asprintf(&tmp, "/proc/self/fd/%d", fd); + + target = malloc(PATH_MAX); + if (!target) + ksft_exit_fail_msg("fdreadlink: malloc failed\n"); + memset(target, 0, PATH_MAX); + + E_readlink(tmp, target, PATH_MAX); + free(tmp); + return target; +} + +__maybe_unused +static bool fdequal(int fd, int dfd, const char *path) +{ + char *fdpath, *dfdpath, *other; + bool cmp; + + fdpath = fdreadlink(fd); + dfdpath = fdreadlink(dfd); + + if (!path) + E_asprintf(&other, "%s", dfdpath); + else if (*path == '/') + E_asprintf(&other, "%s", path); + else + E_asprintf(&other, "%s/%s", dfdpath, path); + + cmp = !strcmp(fdpath, other); + + free(fdpath); + free(dfdpath); + free(other); + return cmp; +} + +static bool openat2_supported = false; + +__attribute__((constructor)) +static void __detect_openat2_supported(void) +{ + struct open_how how = {}; + int fd; + + BUILD_BUG_ON(sizeof(struct open_how) != OPEN_HOW_SIZE_VER0); -int touchat(int dfd, const char *path); -char *fdreadlink(int fd); -bool fdequal(int fd, int dfd, const char *path); + /* Check openat2(2) support. */ + fd = sys_openat2(AT_FDCWD, ".", &how); + openat2_supported = (fd >= 0); -extern bool openat2_supported; + if (fd >= 0) + close(fd); +} #endif /* __RESOLVEAT_H__ */ -- 2.53.0
