diff options
| author | Yonghong Song <yhs@fb.com> | 2020-08-19 00:23:12 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2020-08-19 02:36:23 +0200 |
| commit | 00fa1d83a8b50351c830521d00135e823c46e7d0 (patch) | |
| tree | 586aac21b3840b28a2ad2c76e13dfe7c415b2970 /tools | |
| parent | bpf: Avoid visit same object multiple times (diff) | |
| download | linux-00fa1d83a8b50351c830521d00135e823c46e7d0.tar.xz linux-00fa1d83a8b50351c830521d00135e823c46e7d0.zip | |
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
Diffstat (limited to 'tools')
| -rw-r--r-- | tools/bpf/bpftool/pids.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/tools/bpf/bpftool/pids.c b/tools/bpf/bpftool/pids.c index e3b116325403..df7d8ec76036 100644 --- a/tools/bpf/bpftool/pids.c +++ b/tools/bpf/bpftool/pids.c @@ -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; |