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34 lines
774 B
C
34 lines
774 B
C
// clang-format off
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#include <vmlinux.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_tracing.h>
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// clang-format on
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char _license[] SEC("license") = "GPL";
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, __u32);
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__type(value, __u64);
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} counter_map SEC(".maps");
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extern void bpf_rcu_read_lock(void) __attribute__((section(".ksyms")));
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extern void bpf_rcu_read_unlock(void) __attribute__((section(".ksyms")));
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SEC("tp_btf/sys_enter")
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int BPF_PROG(sys_enter, struct pt_regs *regs, long id) {
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__u32 key = 0;
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__u64 *count;
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bpf_rcu_read_lock();
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count = bpf_map_lookup_elem(&counter_map, &key);
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if (count) {
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__sync_fetch_and_add(count, 1);
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}
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bpf_rcu_read_unlock();
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return 0;
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} |