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

/* Minimal implementation of _fstat_r */
int _fstat_r(struct _reent *r, int file, struct stat *st) {
    st->st_mode = S_IFCHR; /* Character device */
    return 0;
}

/* Minimal implementation of _getpid_r */
int _getpid_r(struct _reent *r) {
    return 1; /* Return a dummy process ID */
}

/* Minimal implementation of _kill_r */
int _kill_r(struct _reent *r, int pid, int sig) {
    r->_errno = EINVAL;
    return -1; /* Indicate failure */
}