diff --git a/tools/lib/bpf/Makefile b/tools/lib/bpf/Makefile index 425b480bda752afa1f835ed32d66c8985c0ee7b3..1b4a683a00fc4d50739c0cb7f157345340d62e67 100644 --- a/tools/lib/bpf/Makefile +++ b/tools/lib/bpf/Makefile @@ -66,7 +66,7 @@ ifndef VERBOSE endif FEATURE_USER = .libbpf -FEATURE_TESTS = libelf libelf-mmap bpf reallocarray +FEATURE_TESTS = libelf libelf-mmap bpf reallocarray cxx FEATURE_DISPLAY = libelf bpf INCLUDES = -I. -I$(srctree)/tools/include -I$(srctree)/tools/arch/$(ARCH)/include/uapi -I$(srctree)/tools/include/uapi @@ -148,6 +148,12 @@ LIB_FILE := $(addprefix $(OUTPUT),$(LIB_FILE)) CMD_TARGETS = $(LIB_FILE) +CXX_TEST_TARGET = $(OUTPUT)test_libbpf + +ifeq ($(feature-cxx), 1) + CMD_TARGETS += $(CXX_TEST_TARGET) +endif + TARGETS = $(CMD_TARGETS) all: fixdep all_cmd @@ -175,6 +181,9 @@ $(OUTPUT)libbpf.so: $(BPF_IN) $(OUTPUT)libbpf.a: $(BPF_IN) $(QUIET_LINK)$(RM) $@; $(AR) rcs $@ $^ +$(OUTPUT)test_libbpf: test_libbpf.cpp $(OUTPUT)libbpf.a + $(QUIET_LINK)$(CXX) $^ -lelf -o $@ + define do_install if [ ! -d '$(DESTDIR_SQ)$2' ]; then \ $(INSTALL) -d -m 755 '$(DESTDIR_SQ)$2'; \ @@ -201,8 +210,8 @@ config-clean: $(Q)$(MAKE) -C $(srctree)/tools/build/feature/ clean >/dev/null clean: - $(call QUIET_CLEAN, libbpf) $(RM) *.o *~ $(TARGETS) *.a *.so .*.d .*.cmd \ - $(RM) LIBBPF-CFLAGS + $(call QUIET_CLEAN, libbpf) $(RM) $(TARGETS) $(CXX_TEST_TARGET) \ + *.o *~ *.a *.so .*.d .*.cmd LIBBPF-CFLAGS $(call QUIET_CLEAN, core-gen) $(RM) $(OUTPUT)FEATURE-DUMP.libbpf diff --git a/tools/lib/bpf/bpf.h b/tools/lib/bpf/bpf.h index 8bdfd806253ae64310a397213a3328706fcf4542..09e8bbe111d4c39452162b4e91c8c146b0394054 100644 --- a/tools/lib/bpf/bpf.h +++ b/tools/lib/bpf/bpf.h @@ -27,6 +27,10 @@ #include #include +#ifdef __cplusplus +extern "C" { +#endif + #ifndef LIBBPF_API #define LIBBPF_API __attribute__((visibility("default"))) #endif @@ -132,4 +136,9 @@ LIBBPF_API int bpf_load_btf(void *btf, __u32 btf_size, char *log_buf, LIBBPF_API int bpf_task_fd_query(int pid, int fd, __u32 flags, char *buf, __u32 *buf_len, __u32 *prog_id, __u32 *fd_type, __u64 *probe_offset, __u64 *probe_addr); + +#ifdef __cplusplus +} /* extern "C" */ +#endif + #endif /* __LIBBPF_BPF_H */ diff --git a/tools/lib/bpf/btf.h b/tools/lib/bpf/btf.h index 386b2ffc32a3e6e6f66cebb1795575de6eda19f2..701ad2b6c41fe7b71cd412db3cd34d0e5b7d26f5 100644 --- a/tools/lib/bpf/btf.h +++ b/tools/lib/bpf/btf.h @@ -6,6 +6,10 @@ #include +#ifdef __cplusplus +extern "C" { +#endif + #ifndef LIBBPF_API #define LIBBPF_API __attribute__((visibility("default"))) #endif @@ -80,4 +84,8 @@ int btf_ext__reloc(struct btf *btf, struct btf_ext *btf_ext, const char *sec_name, __u32 insns_cnt, void **func_info, __u32 *func_info_len); +#ifdef __cplusplus +} /* extern "C" */ +#endif + #endif /* __LIBBPF_BTF_H */ diff --git a/tools/lib/bpf/libbpf.h b/tools/lib/bpf/libbpf.h index b1686a78710224590a1313f825dfb3bb83822a96..74e57e041705a3c99f430e5fea53de0f5de7fa73 100644 --- a/tools/lib/bpf/libbpf.h +++ b/tools/lib/bpf/libbpf.h @@ -16,6 +16,10 @@ #include // for size_t #include +#ifdef __cplusplus +extern "C" { +#endif + #ifndef LIBBPF_API #define LIBBPF_API __attribute__((visibility("default"))) #endif @@ -335,4 +339,9 @@ int libbpf_nl_get_qdisc(int sock, unsigned int nl_pid, int ifindex, libbpf_dump_nlmsg_t dump_qdisc_nlmsg, void *cookie); int libbpf_nl_get_filter(int sock, unsigned int nl_pid, int ifindex, int handle, libbpf_dump_nlmsg_t dump_filter_nlmsg, void *cookie); + +#ifdef __cplusplus +} /* extern "C" */ +#endif + #endif /* __LIBBPF_LIBBPF_H */ diff --git a/tools/lib/bpf/test_libbpf.cpp b/tools/lib/bpf/test_libbpf.cpp new file mode 100644 index 0000000000000000000000000000000000000000..abf3fc25c9fa363e511318277d54d1489a05f7ea --- /dev/null +++ b/tools/lib/bpf/test_libbpf.cpp @@ -0,0 +1,18 @@ +/* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */ +#include "libbpf.h" +#include "bpf.h" +#include "btf.h" + +/* do nothing, just make sure we can link successfully */ + +int main(int argc, char *argv[]) +{ + /* libbpf.h */ + libbpf_set_print(NULL, NULL, NULL); + + /* bpf.h */ + bpf_prog_get_fd_by_id(0); + + /* btf.h */ + btf__new(NULL, 0, NULL); +}