bpf: update bpf_{g,s}et_retval documentation

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* replace 'syscall' with 'upper layers', still mention that it's being
  exported via syscall errno
* describe what happens in set_retval(-EPERM) + return 1
* describe what happens with bind's 'return 3'

Acked-by: Martin KaFai Lau <kafai@fb.com>
Signed-off-by: Stanislav Fomichev <sdf@google.com>
Link: https://lore.kernel.org/r/20220823222555.523590-5-sdf@google.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

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Stanislav Fomichev 2022-08-23 15:25:54 -07:00 • committed by Alexei Starovoitov

parent 8a67f2de9b

commit 2172fb8007

2 changed files with 34 additions and 10 deletions

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include/uapi/linux/bpf.h

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