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Michal Rostecki
bf2164c92f
BPF iterators[0] are a way to dump kernel data into user-space and an alternative to `/proc` filesystem. This change adds support for BPF iterators on the user-space side. It provides a possibility to retrieve the outputs of BPF iterator programs both from sync and async Rust code. [0] https://docs.kernel.org/bpf/bpf_iterators.html
24 lines
530 B
C
24 lines
530 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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// clang-format on
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char _license[] SEC("license") = "GPL";
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SEC("iter/task")
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int iter_task(struct bpf_iter__task *ctx) {
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struct seq_file *seq = ctx->meta->seq;
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struct task_struct *task = ctx->task;
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// Verifier requires this check.
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if (task == NULL) {
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return 0;
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}
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if (ctx->meta->seq_num == 0) {
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BPF_SEQ_PRINTF(seq, "tgid pid name\n");
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}
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BPF_SEQ_PRINTF(seq, "%-8d %-8d %s\n", task->tgid, task->pid, task->comm);
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return 0;
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}
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