CH32V307_Template/src/syscalls.c

#include <sys/stat.h>

int _fstat(int file, struct stat *st) {
  st->st_mode = S_IFCHR;

  return 0;
}

int _close(int file) {
  return -1;
}

int _isatty(int file) {
  return -1;
}

off_t _lseek(int file, off_t pos, int whence) {
  return -1;
}