#ifndef _STDLIB_H #define _STDLIB_H #define EXIT_SUCCESS 0 #define EXIT_FAILURE 1 #ifdef __cplusplus extern "C" { #endif _Noreturn void abort(void); int atexit(void (*)(void)); int atoi(const char *); void free(void *); char *getenv(const char *); void *malloc(size_t); void *calloc(size_t, size_t); _Noreturn void exit(int status); int abs(int); #ifdef __cplusplus } #endif #endif