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libbpf: Introduce errstr() for stringifying errno

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Add function errstr(int err) that allows converting numeric error codes
into string representations.

Signed-off-by: Mykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: Andrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241111212919.368971-2-mykyta.yatsenko5@gmail.com
This commit is contained in:
Mykyta Yatsenko 2024-11-11 21:29:16 +00:00 • committed by Andrii Nakryiko
parent 213a695297
commit 1633a83bf9
2 changed files with 78 additions and 0 deletions
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71
tools/lib/bpf/str_error.c
View file

@ -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 +35,70 @@ 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 -E2BIG: return "-E2BIG";
case -EACCES: return "-EACCES";
case -EADDRINUSE: return "-EADDRINUSE";
case -EADDRNOTAVAIL: return "-EADDRNOTAVAIL";
case -EAGAIN: return "-EAGAIN";
case -EALREADY: return "-EALREADY";
case -EBADF: return "-EBADF";
case -EBADFD: return "-EBADFD";
case -EBUSY: return "-EBUSY";
case -ECANCELED: return "-ECANCELED";
case -ECHILD: return "-ECHILD";
case -EDEADLK: return "-EDEADLK";
case -EDOM: return "-EDOM";
case -EEXIST: return "-EEXIST";
case -EFAULT: return "-EFAULT";
case -EFBIG: return "-EFBIG";
case -EILSEQ: return "-EILSEQ";
case -EINPROGRESS: return "-EINPROGRESS";
case -EINTR: return "-EINTR";
case -EINVAL: return "-EINVAL";
case -EIO: return "-EIO";
case -EISDIR: return "-EISDIR";
case -ELOOP: return "-ELOOP";
case -EMFILE: return "-EMFILE";
case -EMLINK: return "-EMLINK";
case -EMSGSIZE: return "-EMSGSIZE";
case -ENAMETOOLONG: return "-ENAMETOOLONG";
case -ENFILE: return "-ENFILE";
case -ENODATA: return "-ENODATA";
case -ENODEV: return "-ENODEV";
case -ENOENT: return "-ENOENT";
case -ENOEXEC: return "-ENOEXEC";
case -ENOLINK: return "-ENOLINK";
case -ENOMEM: return "-ENOMEM";
case -ENOSPC: return "-ENOSPC";
case -ENOTBLK: return "-ENOTBLK";
case -ENOTDIR: return "-ENOTDIR";
case -ENOTSUPP: return "-ENOTSUPP";
case -ENOTTY: return "-ENOTTY";
case -ENXIO: return "-ENXIO";
case -EOPNOTSUPP: return "-EOPNOTSUPP";
case -EOVERFLOW: return "-EOVERFLOW";
case -EPERM: return "-EPERM";
case -EPIPE: return "-EPIPE";
case -EPROTO: return "-EPROTO";
case -EPROTONOSUPPORT: return "-EPROTONOSUPPORT";
case -ERANGE: return "-ERANGE";
case -EROFS: return "-EROFS";
case -ESPIPE: return "-ESPIPE";
case -ESRCH: return "-ESRCH";
case -ETXTBSY: return "-ETXTBSY";
case -EUCLEAN: return "-EUCLEAN";
case -EXDEV: return "-EXDEV";
default:
snprintf(buf, sizeof(buf), "%d", err);
return buf;
}
}

7
tools/lib/bpf/str_error.h
View file

@ -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 */