devsw_name2chr
pmaj = devsw_name2chr(name, devname, sizeof(devname));
major = devsw_name2chr("midi", NULL, 0);
cttymajor = devsw_name2chr("ctty", NULL, 0);
cmaj = devsw_name2chr("crypto", NULL, 0);
devmajor_t devsw_name2chr(const char *, char *, size_t);