52 lines
1.3 KiB
C
52 lines
1.3 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (C) 2023 Chuyi Zhou <zhouchuyi@bytedance.com> */
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include "bpf_misc.h"
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#include "bpf_experimental.h"
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char _license[] SEC("license") = "GPL";
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pid_t target_pid;
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int procs_cnt, threads_cnt, proc_threads_cnt, invalid_cnt;
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void bpf_rcu_read_lock(void) __ksym;
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void bpf_rcu_read_unlock(void) __ksym;
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SEC("fentry.s/" SYS_PREFIX "sys_getpgid")
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int iter_task_for_each_sleep(void *ctx)
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{
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struct task_struct *cur_task = bpf_get_current_task_btf();
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struct task_struct *pos;
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if (cur_task->pid != target_pid)
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return 0;
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procs_cnt = threads_cnt = proc_threads_cnt = 0;
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bpf_rcu_read_lock();
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bpf_for_each(task, pos, NULL, ~0U) {
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/* Below instructions shouldn't be executed for invalid flags */
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invalid_cnt++;
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}
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bpf_for_each(task, pos, NULL, BPF_TASK_ITER_PROC_THREADS) {
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/* Below instructions shouldn't be executed for invalid task__nullable */
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invalid_cnt++;
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}
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bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_PROCS)
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if (pos->pid == target_pid)
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procs_cnt++;
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bpf_for_each(task, pos, cur_task, BPF_TASK_ITER_PROC_THREADS)
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proc_threads_cnt++;
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bpf_for_each(task, pos, NULL, BPF_TASK_ITER_ALL_THREADS)
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if (pos->tgid == target_pid)
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threads_cnt++;
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bpf_rcu_read_unlock();
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return 0;
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}
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