libbpf: make libbpf_strerror_r agnostic to sign of error

It's often inconvenient to switch sign of error when passing it into
libbpf_strerror_r. It's better for it to handle that automatically.

Signed-off-by: Andrii Nakryiko <andriin@fb.com>
Reviewed-by: Stanislav Fomichev <sdf@google.com>
Acked-by: Song Liu <songliubraving@fb.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

diff --git a/tools/lib/bpf/str_error.c b/tools/lib/bpf/str_error.c
index 00e48ac..b8064ee 100644 (file)
--- a/tools/lib/bpf/str_error.c
+++ b/tools/lib/bpf/str_error.c
@@ -11,7 +11,7 @@
  */
 char *libbpf_strerror_r(int err, char *dst, int len)
 {
-       int ret = strerror_r(err, dst, len);
+       int ret = strerror_r(err < 0 ? -err : err, dst, len);
        if (ret)
                snprintf(dst, len, "ERROR: strerror_r(%d)=%d", err, ret);
        return dst;