| ARG_MAX | Maximum number of arguments to a program. | 
| fs_ext | File system type (TStatFS ): (ext) Extended | 
| fs_ext2 | File system type (TStatFS ): (ext2) Second extended | 
| fs_iso | File system type (TStatFS ): ISO 9660 | 
| fs_minix | File system type (TStatFS ): Minix | 
| fs_minix_30 | File system type (TStatFS ): Minix 3.0 | 
| fs_minux_V2 | File system type (TStatFS ): Minix V2 | 
| fs_msdos | File system type (TStatFS ): MSDOS (FAT) | 
| fs_nfs | File system type (TStatFS ): NFS | 
| fs_old_ext2 | File system type (TStatFS ): (ext2) Old second extended | 
| fs_proc | File system type (TStatFS ): PROC fs | 
| fs_xia | File system type (TStatFS ): XIA | 
| IOCtl_TCGETS | IOCTL call number: get Terminal Control settings | 
| LOCK_EX | FpFLock  Exclusive lock | 
| LOCK_NB | FpFLock  Non-blocking operation | 
| LOCK_SH | FpFLock  Shared lock | 
| LOCK_UN | FpFLock  unlock | 
| MAP_FAILED | Error return value for mmap: mmap operation failed. | 
| MAP_FIXED | #rtl.baseunix.FpMMap  map type: Interpret addr exactly | 
| MAP_PRIVATE | #rtl.baseunix.FpMMap  map type: Changes are private | 
| MAP_SHARED | #rtl.baseunix.FpMMap  map type: Share changes | 
| MAP_TYPE | #rtl.baseunix.FpMMap  map type: Bitmask for type of mapping | 
| NAME_MAX | Maximum filename length. | 
| Open_Accmode | Bitmask to determine access mode in open flags. | 
| Open_Append | File open mode: Append to file | 
| Open_Creat | File open mode: Create if file does not yet exist. | 
| Open_Direct | File open mode: Minimize caching effects | 
| Open_Directory | File open mode: File must be directory. | 
| Open_Excl | File open mode: Open exclusively | 
| Open_LargeFile | File open mode: Open for 64-bit I/O | 
| Open_NDelay | File open mode: Alias for Open_NonBlock | 
| Open_NoCtty | File open mode: No TTY control. | 
| Open_NoFollow | File open mode: Fail if file is symbolic link. | 
| Open_NonBlock | File open mode: Open in non-blocking mode | 
| Open_RdOnly | File open mode: Read only | 
| Open_RdWr | File open mode: Read/Write | 
| Open_Sync | File open mode: Write to disc at once | 
| Open_Trunc | File open mode: Truncate file to length 0 | 
| Open_WrOnly | File open mode: Write only | 
| PATH_MAX | Maximum pathname length. | 
| PRIO_PGRP | #rtl.baseunix.fpGetPriority  option: Get process group priority. | 
| PRIO_PROCESS | #rtl.baseunix.fpGetPriority  option: Get process priority. | 
| PRIO_USER | #rtl.baseunix.fpGetPriority  option: Get user priority. | 
| PROT_EXEC | #rtl.baseunix.FpMMap  memory access: page can be executed | 
| PROT_NONE | #rtl.baseunix.FpMMap  memory access: page can not be accessed | 
| PROT_READ | #rtl.baseunix.FpMMap  memory access: page can be read | 
| PROT_WRITE | #rtl.baseunix.FpMMap  memory access: page can be written | 
| P_IN | Input file descriptor of pipe pair. | 
| P_OUT | Output file descriptor of pipe pair. | 
| SIG_MAXSIG | Maximum system signal number. | 
| STAT_IFBLK | File (#rtl.baseunix.stat  record) mode: Block device | 
| STAT_IFCHR | File (#rtl.baseunix.stat  record) mode: Character device | 
| STAT_IFDIR | File (#rtl.baseunix.stat  record) mode: Directory | 
| STAT_IFIFO | File (#rtl.baseunix.stat  record) mode: FIFO | 
| STAT_IFLNK | File (#rtl.baseunix.stat  record) mode: Link | 
| STAT_IFMT | File (#rtl.baseunix.stat  record) mode: File type bit mask | 
| STAT_IFREG | File (#rtl.baseunix.stat  record) mode: Regular file | 
| STAT_IFSOCK | File (#rtl.baseunix.stat  record) mode: Socket | 
| STAT_IRGRP | File (#rtl.baseunix.stat  record) mode: Group read permission | 
| STAT_IROTH | File (#rtl.baseunix.stat  record) mode: Other read permission | 
| STAT_IRUSR | File (#rtl.baseunix.stat  record) mode: Owner read permission | 
| STAT_IRWXG | File (#rtl.baseunix.stat  record) mode: Group permission bits mask | 
| STAT_IRWXO | File (#rtl.baseunix.stat  record) mode: Other permission bits mask | 
| STAT_IRWXU | File (#rtl.baseunix.stat  record) mode: Owner permission bits mask | 
| STAT_ISGID | File (#rtl.baseunix.stat  record) mode: GID bit set | 
| STAT_ISUID | File (#rtl.baseunix.stat  record) mode: UID bit set | 
| STAT_ISVTX | File (#rtl.baseunix.stat  record) mode: Sticky bit set | 
| STAT_IWGRP | File (#rtl.baseunix.stat  record) mode: Group write permission | 
| STAT_IWOTH | File (#rtl.baseunix.stat  record) mode: Other write permission | 
| STAT_IWUSR | File (#rtl.baseunix.stat  record) mode: Owner write permission | 
| STAT_IXGRP | File (#rtl.baseunix.stat  record) mode: Others execute permission | 
| STAT_IXOTH | File (#rtl.baseunix.stat  record) mode: Others execute permission | 
| STAT_IXUSR | File (#rtl.baseunix.stat  record) mode: Others execute permission | 
| SYS_NMLN | Max system name length. | 
| Wait_Any | #rtl.baseunix.fpWaitPID : Wait on any process | 
| Wait_Clone | #rtl.baseunix.fpWaitPID : Wait on clone processes only. | 
| Wait_MyPGRP | #rtl.baseunix.fpWaitPID : Wait processes from current process group | 
| Wait_NoHang | #rtl.baseunix.fpWaitPID : Do not wait | 
| Wait_UnTraced | #rtl.baseunix.fpWaitPID : Also report stopped but untraced processes |