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Viewing File: /usr/src/kernels/5.14.0-570.30.1.el9_6.x86_64/tools/lib/bpf/str_error.c

// SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
#undef _GNU_SOURCE
#include <string.h>
#include <stdio.h>
#include <errno.h>
#include "str_error.h"

/* make sure libbpf doesn't use kernel-only integer typedefs */
#pragma GCC poison u8 u16 u32 u64 s8 s16 s32 s64

/*
 * Wrapper to allow for building in non-GNU systems such as Alpine Linux's musl
 * libc, while checking strerror_r() return to avoid having to check this in
 * all places calling it.
 */
char *libbpf_strerror_r(int err, char *dst, int len)
{
	int ret = strerror_r(err < 0 ? -err : err, dst, len);
	/* on glibc <2.13, ret == -1 and errno is set, if strerror_r() can't
	 * handle the error, on glibc >=2.13 *positive* (errno-like) error
	 * code is returned directly
	 */
	if (ret == -1)
		ret = errno;
	if (ret) {
		if (ret == EINVAL)
			/* strerror_r() doesn't recognize this specific error */
			snprintf(dst, len, "unknown error (%d)", err < 0 ? err : -err);
		else
			snprintf(dst, len, "ERROR: strerror_r(%d)=%d", err, ret);
	}
	return dst;
}
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