cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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str_error_r.c (1034B)


      1// SPDX-License-Identifier: GPL-2.0
      2#undef _GNU_SOURCE
      3#include <string.h>
      4#include <stdio.h>
      5#include <linux/string.h>
      6
      7/*
      8 * The tools so far have been using the strerror_r() GNU variant, that returns
      9 * a string, be it the buffer passed or something else.
     10 *
     11 * But that, besides being tricky in cases where we expect that the function
     12 * using strerror_r() returns the error formatted in a provided buffer (we have
     13 * to check if it returned something else and copy that instead), breaks the
     14 * build on systems not using glibc, like Alpine Linux, where musl libc is
     15 * used.
     16 *
     17 * So, introduce yet another wrapper, str_error_r(), that has the GNU
     18 * interface, but uses the portable XSI variant of strerror_r(), so that users
     19 * rest asured that the provided buffer is used and it is what is returned.
     20 */
     21char *str_error_r(int errnum, char *buf, size_t buflen)
     22{
     23	int err = strerror_r(errnum, buf, buflen);
     24	if (err)
     25		snprintf(buf, buflen, "INTERNAL ERROR: strerror_r(%d, [buf], %zd)=%d", errnum, buflen, err);
     26	return buf;
     27}