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![Rong Tao](/assets/img/avatar_default.png)
Commit fe3300897cbf("samples: bpf: fix syscall_tp due to unused syscall") added openat() syscall tracepoints. This patch adds support for openat2() as well. Signed-off-by: Rong Tao <rongtao@cestc.cn> Signed-off-by: Andrii Nakryiko <andrii@kernel.org> Link: https://lore.kernel.org/bpf/tencent_9381CB1A158ED7ADD12C4406034E21A3AC07@qq.com
87 lines
1.7 KiB
C
87 lines
1.7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/* Copyright (c) 2017 Facebook
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*/
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#include <uapi/linux/bpf.h>
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#include <bpf/bpf_helpers.h>
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struct syscalls_enter_open_args {
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unsigned long long unused;
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long syscall_nr;
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long filename_ptr;
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long flags;
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long mode;
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};
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struct syscalls_exit_open_args {
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unsigned long long unused;
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long syscall_nr;
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long ret;
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};
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, u32);
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__type(value, u32);
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__uint(max_entries, 1);
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} enter_open_map SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__type(key, u32);
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__type(value, u32);
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__uint(max_entries, 1);
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} exit_open_map SEC(".maps");
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static __always_inline void count(void *map)
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{
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u32 key = 0;
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u32 *value, init_val = 1;
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value = bpf_map_lookup_elem(map, &key);
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if (value)
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*value += 1;
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else
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bpf_map_update_elem(map, &key, &init_val, BPF_NOEXIST);
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}
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SEC("tracepoint/syscalls/sys_enter_open")
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int trace_enter_open(struct syscalls_enter_open_args *ctx)
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{
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count(&enter_open_map);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_enter_openat")
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int trace_enter_open_at(struct syscalls_enter_open_args *ctx)
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{
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count(&enter_open_map);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_enter_openat2")
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int trace_enter_open_at2(struct syscalls_enter_open_args *ctx)
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{
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count(&enter_open_map);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_exit_open")
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int trace_enter_exit(struct syscalls_exit_open_args *ctx)
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{
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count(&exit_open_map);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_exit_openat")
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int trace_enter_exit_at(struct syscalls_exit_open_args *ctx)
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{
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count(&exit_open_map);
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return 0;
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}
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SEC("tracepoint/syscalls/sys_exit_openat2")
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int trace_enter_exit_at2(struct syscalls_exit_open_args *ctx)
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{
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count(&exit_open_map);
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return 0;
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}
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