ref: 4eaac6bfb11cc84259e8b418d4babffdf1c637eb dir: /lib/c/string/strerror.c/
#include <errno.h> #include <string.h> #undef strerror char * strerror(int errnum) { if (errnum < _sys_nerr) return _sys_errlist[errnum]; else return "Unknown error"; }