netdev - [PATCH v4 bpf-next 1/9] libbpf: make libbpf_strerror

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Message-ID: <20190629034906.1209916-2-andriin@fb.com>
Date:   Fri, 28 Jun 2019 20:48:58 -0700
From:   Andrii Nakryiko <andriin@...com>
To:     <andrii.nakryiko@...il.com>, <bpf@...r.kernel.org>,
        <netdev@...r.kernel.org>, <ast@...com>, <daniel@...earbox.net>,
        <kernel-team@...com>, <sdf@...ichev.me>, <songliubraving@...com>
CC:     Andrii Nakryiko <andriin@...com>
Subject: [PATCH v4 bpf-next 1/9] 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@...com>
Reviewed-by: Stanislav Fomichev <sdf@...gle.com>
Acked-by: Song Liu <songliubraving@...com>
---
 tools/lib/bpf/str_error.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/lib/bpf/str_error.c b/tools/lib/bpf/str_error.c
index 00e48ac5b806..b8064eedc177 100644
--- 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;
-- 
2.17.1