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bpftool: Handle EAGAIN error code properly in pids collection

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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
This commit is contained in:
Yonghong Song 2020-08-18 15:23:12 -07:00 committed by Alexei Starovoitov
parent e60572b8d4
commit 00fa1d83a8
1 changed files with 2 additions and 0 deletions
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2
tools/bpf/bpftool/pids.c
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@ -134,6 +134,8 @@ int build_obj_refs_table(struct obj_refs_table *table, enum bpf_obj_type type)
while (true) {
ret = read(fd, buf, sizeof(buf));
if (ret < 0) {
if (errno == EAGAIN)
continue;
err = -errno;
p_err("failed to read PID iterator output: %d", err);
goto out;