lib/bpf/btf.h

1 /* SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause) */
48  * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
50  * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
51  * returned on error instead. In both cases thread-local `errno` variable is
68  * creates non-split BTF.
70  * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
72  * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
73  * returned on error instead. In both cases thread-local `errno` variable is
84  * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
86  * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
87  * returned on error instead. In both cases thread-local `errno` variable is
100  * `btf__new_empty()` and creates non-split BTF.
102  * On error, error-code-encoded-as-pointer is returned, not a NULL. To extract
104  * `libbpf_set_strict_mode(LIBBPF_STRICT_CLEAN_PTRS)` is enabled, NULL is
105  * returned on error instead. In both cases thread-local `errno` variable is
155  * @param btf BTF object which all the BTF types and strings are added to
156  * @param src_btf BTF object which all BTF types and referenced strings are copied from
162  * Only strings referenced from BTF types are copied over and deduplicated, so
163  * if there were some unused strings in *src_btf*, those won't be copied over,
169  * semantics and the operation as a whole is all-or-nothing.
171  * *src_btf* has to be non-split BTF, as of now copying types from split BTF
172  * is not supported and will result in -ENOTSUP error code returned.
256 	 * - struct my_struct <FNAME>
257 	 * - void (*<FNAME>)(int)
258 	 * - char (*<FNAME>)[123]
261 	/* extra indentation level (in number of tabs) to emit for multi-line
286 	bool emit_zeroes;	/* show 0-valued fields */
318 #define BTF_KIND_ENUM64		19	/* Enum for up-to 64bit values */
322 	return BTF_INFO_KIND(t->info);  in btf_kind()
327 	return BTF_INFO_VLEN(t->info);  in btf_vlen()
332 	return BTF_INFO_KFLAG(t->info);  in btf_kflag()
499 	 * bleeding-edge. Here we are avoiding relying on struct btf_enum64  in btf_enum64_value()
501 	 * of system-wide kernel headers.  in btf_enum64_value()
506 	 * a three-element array of u32 and access second (lo32) and third  in btf_enum64_value()
534 	return kflag ? BTF_MEMBER_BIT_OFFSET(m->offset) : m->offset;  in btf_member_bit_offset()
546 	return kflag ? BTF_MEMBER_BITFIELD_SIZE(m->offset) : 0;  in btf_member_bitfield_size()