From: Mykyta Yatsenko <mykyta.yatsenko5@gmail.com>
To: bpf@vger.kernel.org, ast@kernel.org, andrii@kernel.org,
daniel@iogearbox.net, kafai@meta.com, kernel-team@meta.com
Cc: Mykyta Yatsenko <yatsenko@meta.com>
Subject: [PATCH bpf-next v3 1/4] libbpf: introduce errstr() for stringifying errno
Date: Mon, 11 Nov 2024 21:29:16 +0000 [thread overview]
Message-ID: <20241111212919.368971-2-mykyta.yatsenko5@gmail.com> (raw)
In-Reply-To: <20241111212919.368971-1-mykyta.yatsenko5@gmail.com>
From: Mykyta Yatsenko <yatsenko@meta.com>
Add function errstr(int err) that allows converting numeric error codes
into string representations.
Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
---
tools/lib/bpf/str_error.c | 59 +++++++++++++++++++++++++++++++++++++++
tools/lib/bpf/str_error.h | 7 +++++
2 files changed, 66 insertions(+)
diff --git a/tools/lib/bpf/str_error.c b/tools/lib/bpf/str_error.c
index 5e6a1e27ddf9..cf817c0c7ddd 100644
--- a/tools/lib/bpf/str_error.c
+++ b/tools/lib/bpf/str_error.c
@@ -5,6 +5,10 @@
#include <errno.h>
#include "str_error.h"
+#ifndef ENOTSUPP
+#define ENOTSUPP 524
+#endif
+
/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64
@@ -31,3 +35,58 @@ char *libbpf_strerror_r(int err, char *dst, int len)
}
return dst;
}
+
+const char *errstr(int err)
+{
+ static __thread char buf[12];
+
+ if (err > 0)
+ err = -err;
+
+ switch (err) {
+ case -EINVAL: return "-EINVAL";
+ case -EPERM: return "-EPERM";
+ case -ENXIO: return "-ENXIO";
+ case -ENOMEM: return "-ENOMEM";
+ case -ENOENT: return "-ENOENT";
+ case -E2BIG: return "-E2BIG";
+ case -EEXIST: return "-EEXIST";
+ case -EFAULT: return "-EFAULT";
+ case -ENOSPC: return "-ENOSPC";
+ case -EACCES: return "-EACCES";
+ case -EAGAIN: return "-EAGAIN";
+ case -EBADF: return "-EBADF";
+ case -ENAMETOOLONG: return "-ENAMETOOLONG";
+ case -ESRCH: return "-ESRCH";
+ case -EBUSY: return "-EBUSY";
+ case -ENOTSUPP: return "-ENOTSUPP";
+ case -EPROTO: return "-EPROTO";
+ case -ERANGE: return "-ERANGE";
+ case -EMSGSIZE: return "-EMSGSIZE";
+ case -EINTR: return "-EINTR";
+ case -ENODATA: return "-ENODATA";
+ case -ENODEV: return "-ENODEV";
+ case -ENOLINK:return "-ENOLINK";
+ case -EIO: return "-EIO";
+ case -EUCLEAN: return "-EUCLEAN";
+ case -EDOM: return "-EDOM";
+ case -ELOOP: return "-ELOOP";
+ case -EPROTONOSUPPORT: return "-EPROTONOSUPPORT";
+ case -EDEADLK: return "-EDEADLK";
+ case -EOVERFLOW: return "-EOVERFLOW";
+ case -EOPNOTSUPP: return "-EOPNOTSUPP";
+ case -EINPROGRESS: return "-EINPROGRESS";
+ case -EBADFD: return "-EBADFD";
+ case -EADDRINUSE: return "-EADDRINUSE";
+ case -EADDRNOTAVAIL: return "-EADDRNOTAVAIL";
+ case -ECANCELED: return "-ECANCELED";
+ case -EILSEQ: return "-EILSEQ";
+ case -EMFILE: return "-EMFILE";
+ case -ENOTTY: return "-ENOTTY";
+ case -EALREADY: return "-EALREADY";
+ case -ECHILD: return "-ECHILD";
+ default:
+ snprintf(buf, sizeof(buf), "%d", err);
+ return buf;
+ }
+}
diff --git a/tools/lib/bpf/str_error.h b/tools/lib/bpf/str_error.h
index 626d7ffb03d6..66ffebde0684 100644
--- a/tools/lib/bpf/str_error.h
+++ b/tools/lib/bpf/str_error.h
@@ -6,4 +6,11 @@
char *libbpf_strerror_r(int err, char *dst, int len);
+/**
+ * @brief **errstr()** returns string corresponding to numeric errno
+ * @param err negative numeric errno
+ * @return pointer to string representation of the errno, that is invalidated
+ * upon the next call.
+ */
+const char *errstr(int err);
#endif /* __LIBBPF_STR_ERROR_H */
--
2.47.0
next prev parent reply other threads:[~2024-11-11 21:29 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-11-11 21:29 [PATCH bpf-next v3 0/4] libbpf: stringify error codes in log messages Mykyta Yatsenko
2024-11-11 21:29 ` Mykyta Yatsenko [this message]
2024-11-12 4:35 ` [PATCH bpf-next v3 1/4] libbpf: introduce errstr() for stringifying errno Andrii Nakryiko
2024-11-11 21:29 ` [PATCH bpf-next v3 2/4] libbpf: stringify errno in log messages in libbpf.c Mykyta Yatsenko
2024-11-11 21:29 ` [PATCH bpf-next v3 3/4] libbpf: stringify errno in log messages in btf*.c Mykyta Yatsenko
2024-11-11 21:29 ` [PATCH bpf-next v3 4/4] libbpf: stringify errno in log messages in the remaining code Mykyta Yatsenko
2024-11-12 4:40 ` [PATCH bpf-next v3 0/4] libbpf: stringify error codes in log messages patchwork-bot+netdevbpf
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