#include <errno.h>
#include <sys/stat.h>

void _exit(int status) {
  (void)status;
  while (1) {
  }
}
int _close(int fd) {
  (void)fd;
  return -1;
}
int _fstat(int fd, struct stat *st) {
  (void)fd;
  st->st_mode = S_IFCHR;
  return 0;
}
int _isatty(int fd) {
  (void)fd;
  return 1;
}
int _lseek(int fd, int ptr, int dir) {
  (void)fd;
  (void)ptr;
  (void)dir;
  return 0;
}
int _read(int fd, char *ptr, int len) {
  (void)fd;
  (void)ptr;
  (void)len;
  return 0;
}
int _write(int fd, char *ptr, int len) {
  (void)fd;
  (void)ptr;
  return len;
}
int _kill(int pid, int sig) {
  (void)pid;
  (void)sig;
  errno = EINVAL;
  return -1;
}
int _getpid(void) { return 1; }
void *_sbrk(int incr) {
  (void)incr;
  errno = ENOMEM;
  return (void *)-1;
}