man pages section 2: System Calls
    
D
 
 detach an LWP -- _lwp_detach ( Index Term Link )
 
 determine accessibility of a file -- access ( Index Term Link )
 
 determine if current executable is running setuid or setgid -- issetugid ( Index Term Link )
 
 devices, I/O control functions -- ioctl ( Index Term Link )
 
 directories
  change working directory -- chdir ( Index Term Link )
  create a new one -- mknod ( Index Term Link )
  get configurable pathname variables -- pathconf ( Index Term Link )
  make a new one -- mkdir ( Index Term Link )
  read directory entries and put in a file system independent format -- getdents ( Index Term Link )
  remove -- rmdir ( Index Term Link )
 
 discover all message queue identifiers -- msgids ( Index Term Link )
 
 discover all semaphore identifiers -- semids ( Index Term Link )
 
 discover all shared memory identifiers -- shmids ( Index Term Link )
 
 dup -- duplicate an open file descriptor ( Index Term Link )