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| author | Alan Maguire <alan.maguire@oracle.com> | 2020-07-13 12:52:34 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-07-13 16:55:49 -0700 |
| commit | 59e8b60bf068180fcadb0ae06ce8f6f835132ce6 (patch) | |
| tree | 9add8fdea634ba08ed2a57cae8da34e497eed9e5 /tools/testing/selftests/bpf/progs/trace_printk.c | |
| parent | ac5a72ea5c8989871e61f6bb0852e0f91de51ebe (diff) | |
| download | linux-stable-59e8b60bf068180fcadb0ae06ce8f6f835132ce6.tar.gz linux-stable-59e8b60bf068180fcadb0ae06ce8f6f835132ce6.tar.bz2 linux-stable-59e8b60bf068180fcadb0ae06ce8f6f835132ce6.zip | |
selftests/bpf: Add selftests verifying bpf_trace_printk() behaviour
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
Diffstat (limited to 'tools/testing/selftests/bpf/progs/trace_printk.c')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/trace_printk.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/trace_printk.c b/tools/testing/selftests/bpf/progs/trace_printk.c new file mode 100644 index 000000000000..8ca7f399b670 --- /dev/null +++ b/tools/testing/selftests/bpf/progs/trace_printk.c @@ -0,0 +1,21 @@ +// SPDX-License-Identifier: GPL-2.0 +// Copyright (c) 2020, Oracle and/or its affiliates. + +#include "vmlinux.h" +#include <bpf/bpf_helpers.h> +#include <bpf/bpf_tracing.h> + +char _license[] SEC("license") = "GPL"; + +int trace_printk_ret = 0; +int trace_printk_ran = 0; + +SEC("tp/raw_syscalls/sys_enter") +int sys_enter(void *ctx) +{ + static const char fmt[] = "testing,testing %d\n"; + + trace_printk_ret = bpf_trace_printk(fmt, sizeof(fmt), + ++trace_printk_ran); + return 0; +} |