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