bpf: Support "%c" in bpf_bprintf_prepare().

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/proc/net/unix uses "%c" to print a single-byte character to escape '\0' in
the name of the abstract UNIX domain socket.  The following selftest uses
it, so this patch adds support for "%c".  Note that it does not support
wide character ("%lc" and "%llc") for simplicity.

Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.co.jp>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Yonghong Song <yhs@fb.com>
Link: https://lore.kernel.org/bpf/20210814015718.42704-3-kuniyu@amazon.co.jp

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Kuniyuki Iwashima 2021-08-14 10:57:16 +09:00 • committed by Andrii Nakryiko

parent 2c860a43dd

commit 3478cfcfcd

1 changed files with 14 additions and 0 deletions

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kernel/bpf/helpers.c

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