Commit 1633a83b authored by Mykyta Yatsenko's avatar Mykyta Yatsenko Committed by Andrii Nakryiko
Browse files

libbpf: Introduce errstr() for stringifying errno 



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

Signed-off-by: default avatarMykyta Yatsenko <yatsenko@meta.com>
Signed-off-by: default avatarAndrii Nakryiko <andrii@kernel.org>
Link: https://lore.kernel.org/bpf/20241111212919.368971-2-mykyta.yatsenko5@gmail.com
parent 213a6952

tools/lib/bpf/str_error.c

+71 −0
Original line number Diff line number Diff line
@@ -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;

	}

}

tools/lib/bpf/str_error.h

+7 −0
Original line number Diff line number Diff line
@@ -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 */