59e8b60bf0
Simple selftests that verifies bpf_trace_printk() returns a sensible value and tracing messages appear. Signed-off-by: Alan Maguire <alan.maguire@oracle.com> Signed-off-by: Alexei Starovoitov <ast@kernel.org> Acked-by: Andrii Nakryiko <andriin@fb.com> Link: https://lore.kernel.org/bpf/1594641154-18897-3-git-send-email-alan.maguire@oracle.com
22 lines
474 B
C
22 lines
474 B
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2020, Oracle and/or its affiliates.
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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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char _license[] SEC("license") = "GPL";
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int trace_printk_ret = 0;
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int trace_printk_ran = 0;
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SEC("tp/raw_syscalls/sys_enter")
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int sys_enter(void *ctx)
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{
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static const char fmt[] = "testing,testing %d\n";
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trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt),
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++trace_printk_ran);
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return 0;
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}
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