d284b82b3e
This doesn't have much effect on the final build, because we link libbasic.a
into libsystemd-shared.so, so in the end, all the object built from basic/
end up in libsystemd-shared. And when the static library is linked into binaries,
any objects that are included in it but are not used are trimmed. Hence, the
size of output artifacts doesn't change:
$ du -sb /var/tmp/inst*
54181861 /var/tmp/inst1 (old)
54207441 /var/tmp/inst1s (old split-usr)
54182477 /var/tmp/inst2 (new)
54208041 /var/tmp/inst2s (new split-usr)
(The negligible change in size is because libsystemd-shared.so is bigger
by a few hundred bytes. I guess it's because symbols are named differently
or something like that.)
The effect is on the build process, in particular partial builds. This change
effectively moves the requirements on some build steps toward the leaves of the
dependency tree. Two effects:
- when building items that do not depend on libsystemd-shared, we
build less stuff for libbasic.a (which wouldn't be used anyway,
so it's a net win).
- when building items that do depend on libshared, we reduce libbasic.a as a
synchronization point, possibly allowing better parallelism.
Method:
1. copy list of .h files from src/basic/meson.build to /tmp/basic
2. $ for i in $(grep '.h$' /tmp/basic); do echo $i; git --no-pager grep "include \"$i\"" src/basic/ 'src/lib*' 'src/nss-*' 'src/journal/sd-journal.c' |grep -v "${i%.h}.c";echo ;done | less
43 lines
1.2 KiB
C
43 lines
1.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <linux/bpf.h>
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#include <stdint.h>
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#include <sys/syscall.h>
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#include "list.h"
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#include "macro.h"
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typedef struct BPFProgram BPFProgram;
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struct BPFProgram {
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unsigned n_ref;
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int kernel_fd;
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uint32_t prog_type;
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size_t n_instructions;
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size_t allocated;
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struct bpf_insn *instructions;
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char *attached_path;
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int attached_type;
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uint32_t attached_flags;
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};
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int bpf_program_new(uint32_t prog_type, BPFProgram **ret);
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BPFProgram *bpf_program_unref(BPFProgram *p);
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BPFProgram *bpf_program_ref(BPFProgram *p);
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int bpf_program_add_instructions(BPFProgram *p, const struct bpf_insn *insn, size_t count);
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int bpf_program_load_kernel(BPFProgram *p, char *log_buf, size_t log_size);
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int bpf_program_cgroup_attach(BPFProgram *p, int type, const char *path, uint32_t flags);
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int bpf_program_cgroup_detach(BPFProgram *p);
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int bpf_map_new(enum bpf_map_type type, size_t key_size, size_t value_size, size_t max_entries, uint32_t flags);
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int bpf_map_update_element(int fd, const void *key, void *value);
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int bpf_map_lookup_element(int fd, const void *key, void *value);
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DEFINE_TRIVIAL_CLEANUP_FUNC(BPFProgram*, bpf_program_unref);
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