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bpftool: Handle EAGAIN error code properly in pids collection
authorYonghong Song <yhs@fb.com>
Tue, 18 Aug 2020 22:23:12 +0000 (15:23 -0700)
committerAlexei Starovoitov <ast@kernel.org>
Wed, 19 Aug 2020 00:36:23 +0000 (17:36 -0700)
commit4077a1cd2a6d2b411f236754b044c59f3ed6576f
tree586aac21b3840b28a2ad2c76e13dfe7c415b2970tree | snapshot
parentbf4637d7fd3d9c1ed0f937cecaa003bbfe7153f9commit | diff
bpftool: Handle EAGAIN error code properly in pids collection

When the error code is EAGAIN, the kernel signals the user
space should retry the read() operation for bpf iterators.
Let us do it.

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Link: https://lore.kernel.org/bpf/20200818222312.2181675-1-yhs@fb.com
tools/bpf/bpftool/pids.c diff | blob | history
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