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Linux kernel mirror (for testing) git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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12345678910111213141516171819202122232425262728// SPDX-License-Identifier: GPL-2.0#undef _GNU_SOURCE#include <string.h>#include <stdio.h>#include <linux/string.h>
/* * The tools so far have been using the strerror_r() GNU variant, that returns * a string, be it the buffer passed or something else. * * But that, besides being tricky in cases where we expect that the function * using strerror_r() returns the error formatted in a provided buffer (we have * to check if it returned something else and copy that instead), breaks the * build on systems not using glibc, like Alpine Linux, where musl libc is * used. * * So, introduce yet another wrapper, str_error_r(), that has the GNU * interface, but uses the portable XSI variant of strerror_r(), so that users * rest asured that the provided buffer is used and it is what is returned. */char *str_error_r(int errnum, char *buf, size_t buflen){ int err = strerror_r(errnum, buf, buflen); if (err) snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, [buf], %zd)=%d", errnum, buflen, err); return buf;}