b9f4c01f3e
It's good to be able to compile bpf_iter selftest even on systems that don't have the very latest vmlinux.h, e.g., for libbpf tests against older kernels in Travis CI. To that extent, re-define bpf_iter_meta and corresponding bpf_iter context structs in each selftest. To avoid type clashes with vmlinux.h, rename vmlinux.h's definitions to get them out of the way. Signed-off-by: Andrii Nakryiko <andriin@fb.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Yonghong Song <yhs@fb.com> Acked-by: Jesper Dangaard Brouer <brouer@redhat.com> Link: https://lore.kernel.org/bpf/20200518234516.3915052-1-andriin@fb.com
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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/* "undefine" structs in vmlinux.h, because we "override" them below */
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#define bpf_iter_meta bpf_iter_meta___not_used
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#define bpf_iter__task_file bpf_iter__task_file___not_used
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#include "vmlinux.h"
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#undef bpf_iter_meta
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#undef bpf_iter__task_file
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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char _license[] SEC("license") = "GPL";
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struct bpf_iter_meta {
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struct seq_file *seq;
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__u64 session_id;
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__u64 seq_num;
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} __attribute__((preserve_access_index));
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struct bpf_iter__task_file {
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struct bpf_iter_meta *meta;
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struct task_struct *task;
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__u32 fd;
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struct file *file;
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} __attribute__((preserve_access_index));
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SEC("iter/task_file")
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int dump_task_file(struct bpf_iter__task_file *ctx)
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{
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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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__u32 fd = ctx->fd;
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struct file *file = ctx->file;
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if (task == (void *)0 || file == (void *)0)
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return 0;
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if (ctx->meta->seq_num == 0)
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BPF_SEQ_PRINTF(seq, " tgid gid fd file\n");
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BPF_SEQ_PRINTF(seq, "%8d %8d %8d %lx\n", task->tgid, task->pid, fd,
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(long)file->f_op);
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return 0;
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}
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