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 */ 21 char *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, %p, %zd)=%d", errnum, buf, buflen, err); 26 return buf; 27 } 28