1#include <sys/stat.h> 2 3#include <errno.h> 4 5sem_t* sem_open(const char* name, int flags, ...) { 6 errno = ENOSYS; 7 return SEM_FAILED; 8} 9 10int sem_close(sem_t* sem) { 11 errno = ENOSYS; 12 return -1; 13} 14